Performance information

• Cooperativity between coordinative unsaturated Fe(III) and aryl-π electrons in MIL-100(Fe) for adsorption of small molecules
  Yuiko Tasaki-Handa; Kazuki Shibuya; Shingo Saito
  New Journal of Chemistry, Volume：48, Number：24, First page：11107, Last page：11113, May 2024, [Reviewed], [Lead, Corresponding]
  Coordinatively unsaturated sites and aryl-π electrons coorperatively affect the adsorption of aromatics with polar groups.
  Royal Society of Chemistry (RSC), English, Scientific journal
  DOI：https://doi.org/10.1039/d4nj01385a
  DOI ID：10.1039/d4nj01385a, ISSN：1144-0546, eISSN：1369-9261, ORCID：176602541
• Multistep pH-peak-focusing liquid chromatography with a hydrophilic polymer gel column for separation of rare earth elements　　　　　　　　　　　　　　　
  Masami Shibukawa; Yosuke Onoyama; Yuiko Handa-Tasaki; Shingo Saito
  Journal of Chromatography A, Volume：1721, First page：464829, Last page：464834, Apr. 2024, [Reviewed]
  Multistep pH-peak-focusing liquid chromatography with a column packed with a hydrophilic polymer gel (a cross-linked hydroxylated methacrylic polymer gel) was developed for separation of rare earth metal ions. Metal ions in a sample solution introduced to the column are chromatographically extracted into the stationary gel phase at the top of the column equilibrated with a basic solution used as the first mobile phase containing acetylacetone and 1,10-phenanthroline by synergistic extraction effect. After the sample solution is introduced, the mobile phases are delivered into the column by stepwise gradient elution in order of decreasing pH. Each metal ion is concentrated at a pH border formed between the zones of different pH in the column and moves toward the outlet of the column with the pH border. Mutual separation of La(III), Ce(III), Nd(III), Eu(III), Y(III), Tb(III), and Yb(III) was achieved by the present method for an 1-mL sample injection with the column of which the inner volume is 11.8 mL. The multistep pH-peak-focusing liquid chromatography with a hydrophilic polymer gel column developed in this study has great potential as a useful method for the separation of rare earth metal ions on a preparatory scale.
  English, Scientific journal
  DOI：https://doi.org/10.1016/j.chroma.2024.464829
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85188557259&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85188557259&origin=inward
  DOI ID：10.1016/j.chroma.2024.464829, ISSN：0021-9673, eISSN：1873-3778, PubMed ID：38522404, SCOPUS ID：85188557259
• High-pH mobile phase in reversed-phase liquid chromatography-tandem mass spectrometry to improve the separation efficiency of aminoglycoside isomers　　　　　　　　　　　　　　　
  Yuta Nakano; Hiroshi Sakamaki; Yuiko Tasaki-Handa; Shingo Saito
  Analytical Sciences, Volume：40, First page：375, Last page：384, Mar. 2024, [Reviewed]
  English, Scientific journal
  DOI：https://doi.org/10.1007/s44211-023-00468-5
  DOI ID：10.1007/s44211-023-00468-5, ISSN：0910-6340, ORCID：176602520
• Holo/apo conversion two-dimensional urea PAGE for speciation of Fe3+-bound transferrin in serum
  Shingo Saito; Junko Ishikawa; Moe Ono; Yuiko Tasaki-Handa; Masami Shibukawa
  Analytical Sciences, Volume：40, First page：227, Last page：233, Nov. 2023, [Reviewed]
  Springer Science and Business Media LLC, English, Scientific journal
  DOI：https://doi.org/10.1007/s44211-023-00460-z
  DOI ID：10.1007/s44211-023-00460-z, ISSN：0910-6340, eISSN：1348-2246
• Americium(III)/Curium(III) Complete Separation and Sensitive Fluorescence Detection by Capillary and Gel Electrophoresis Using Emissive Hexadentate/Octadentate Polyaminocarboxylate Ligands
  Shingo Saito; Tomoko Haraga; Kazuki Marumo; Yoshiyuki Sato; Yuta Nakano; Yuiko Tasaki-Handa; Masami Shibukawa
  Bulletin of the Chemical Society of Japan, Volume：96, Number：3, First page：223, Last page：225, Mar. 2023, [Reviewed]
  The Chemical Society of Japan, Scientific journal
  DOI：https://doi.org/10.1246/bcsj.20220346
  DOI ID：10.1246/bcsj.20220346, ISSN：0009-2673, eISSN：1348-0634
• Unusually Kinetically Inert Monocationic Neptunyl Complex with a Fluorescein-Modified 1,10-Phenanthroline-2,9-dicarboxylate Ligand: Specific Separation and Detection in Gel Electrophoresis
  Kazuhito Yamagata; Kazuki Ouchi; Kazuki Marumo; Yuiko Tasaki-Handa; Tomoko Haraga; Shingo Saito
  Inorganic Chemistry, Volume：62, First page：730, Last page：738, Jan. 2023, [Reviewed]
  American Chemical Society (ACS), English, Scientific journal
  DOI：https://doi.org/10.1021/acs.inorgchem.2c02908
  DOI ID：10.1021/acs.inorgchem.2c02908, ISSN：0020-1669, eISSN：1520-510X
• Lanthanide ion exchange modulated via crystalline phase transition of a mixed-metal coordination polymer based on bis(4-nitrophenyl) phosphate　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Shiori Tsuda; Masami Shibukawa; Shingo Saito
  Inorganic Chemistry Communications, Volume：140, First page：109428, Last page：109428, Jun. 2022, [Reviewed], [Lead, Corresponding]
  Elsevier BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.inoche.2022.109428
  DOI ID：10.1016/j.inoche.2022.109428, ISSN：1387-7003
• 配位高分子の結晶構造変化が関与する非通常系列の金属イオン交換選択性　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa
  Bunseki Kagaku, Volume：70, First page：593, Last page：599, Oct. 2021, [Reviewed], [Lead, Corresponding]
  Japanese, Scientific journal
• Stoichiometry between Humate Unit Molecules and Metal ions in Supramolecular Assembly Induced by Cu²⁺ and Tb³⁺ Measured by Gel Electrophoresis Techniques
  Sumika Nakano; Kazuki Marumo; Rintaro Kazami; Takumi Saito; Tomoko Haraga; Yuiko Tasaki-Handa; Shingo Saito
  Environmental Science & Technology, Volume：55, Number：22, First page：15172, Last page：15180, 2021, [Reviewed]
  American Chemical Society (ACS), Scientific journal
  DOI：https://doi.org/10.1021/acs.est.1c03993
  DOI ID：10.1021/acs.est.1c03993, ISSN：0013-936X, eISSN：1520-5851
• Alkali Metal Ion-exchange in a Metal–Organic Framework Based on Lanthanum and 1,4-Phenylenebis(methylidyne)tetrakis(phosphonic acid)
  Yuiko TASAKI-HANDA; Shiori TSUDA; Masami SHIBUKAWA; Shingo SAITO
  Analytical Sciences, Volume：37, Number：12, First page：1835, Last page：1837, 2021, [Reviewed], [Lead, Corresponding]
  Japan Society for Analytical Chemistry, English, Scientific journal
  DOI：https://doi.org/10.2116/analsci.21n022
  DOI ID：10.2116/analsci.21n022, ISSN：0910-6340, eISSN：1348-2246
• A Chromatographic Approach for Studying Adsorption of Polar Small Molecules on Tetrabutylammonium Bromide Semiclathrate Hydrate
  Yuiko TASAKI-HANDA; Atsuto IWASHITA; Masami SHIBUKAWA; Shingo SAITO
  Analytical Sciences, Volume：38, Number：1, First page：85, Last page：90, 2021, [Reviewed], [Lead, Corresponding]
  Japan Society for Analytical Chemistry, English, Scientific journal
  DOI：https://doi.org/10.2116/analsci.21p182
  DOI ID：10.2116/analsci.21p182, ISSN：0910-6340, eISSN：1348-2246
• Effect of coexisting alkali metal ions on the variation in the coordination mode of 1,4-phenylenbis(methylidyne)tetrakis(phosphonic acid) in a lanthanum(III) metal–organic framework　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Masami Shibukawa; Shingo Saito
  Inorganic Chemistry Communications, Volume：128, First page：108560, Last page：108564, 2021, [Reviewed], [Lead, Corresponding]
  Elsevier BV, Scientific journal
  DOI：https://doi.org/10.1016/j.inoche.2021.108560
  DOI ID：10.1016/j.inoche.2021.108560, ISSN：1387-7003
• Single-Round DNA Aptamer Selection by Combined Use of Capillary Electrophoresis and Next Generation Sequencing: An Aptaomics Approach for Identifying Unique Functional Protein-Binding DNA Aptamers
  Shingo Saito; Toshiki Sakamoto; Naoki Tanaka; Ryo Watanabe; Takuya Kamimura; Kazuki Ota; Kathryn R. Riley; Keitaro Yoshimoto; Yuiko Tasaki-Handa; Masami Shibukawa
  Chemistry - A European Journal, Volume：27, Number：39, First page：10058, Last page：10067, 2021, [Reviewed]
  Wiley, Scientific journal
  DOI：https://doi.org/10.1002/chem.202100177
  DOI ID：10.1002/chem.202100177, ISSN：0947-6539, eISSN：1521-3765, ORCID：93574988
• Transmetalation in a Ce(III)-phosphoester Crystalline Coordination Polymer with an Exceptionally High Selectivity for Yb(III) and Lu(III)　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Shiori Tsuda; Masami Shibukawa; Shingo Saito
  CHEMISTRY-AN ASIAN JOURNAL, Volume：15, Number：17, First page：2653, Last page：2659, Sep. 2020, [Reviewed], [Lead, Corresponding], ［International magazine］
  A novel crystalline coordination polymer containing Ce(3+)and bis(4-nitrophenyl) phosphate (L), CeL3, was synthesized and its unique transmetalation selectivities toward Yb(3+)and Lu(3+)in the lanthanide series were evaluated. The relatively large difference in transmetalation selectivity between the neighboring Tm(3+)and Yb(3+)species is noteworthy because the reactivities of heavy lanthanides are generally considerably similar. The structural strain of the polymeric framework is likely responsible for this unusual trend. Powder X-ray diffraction analysis indicated that, in the cases of only Yb(3+)and Lu3+, large differences in their ionic sizes compared to that of Ce(3+)in the parent framework may induce a structural strain after solid solution formation, while cleavage of the relatively weak Ce-O bond allows the formation of new Yb-O and Lu-O bonds with the incoming Yb(3+)and Lu3+, respectively. Structural phase transitions likely caused by the heterogeneous nucleation of the Yb- (or Lu-) type phase were also observed.
  WILEY-V C H VERLAG GMBH, English, Scientific journal
  DOI：https://doi.org/10.1002/asia.202000502
  DOI ID：10.1002/asia.202000502, ISSN：1861-4728, eISSN：1861-471X, PubMed ID：32502320, Web of Science ID：WOS:000550490300001
• Excess adsorption of acetonitrile and water on MIL-100(Fe) and its potential application in mixed-mode chromatography　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Maho Yoshikawa; Shingo Saito; Masami Shibukawa
  NEW JOURNAL OF CHEMISTRY, Volume：43, Number：42, First page：16566, Last page：16571, Nov. 2019, [Reviewed], [Lead, Corresponding]
  The excess adsorption isotherm of acetonitrile (ACN) on a metal-organic framework constructed from Fe(iii) and 1,3,5-benzenetricarboxylic acid (MIL-100(Fe)) in ACN/water solution was measured and converted to adsorption isotherms of ACN and water. Excess ACN was adsorbed on MIL-100(Fe) when the volume fraction of ACN (x(A)) was smaller than similar to 0.55, while excess water was adsorbed when x(A) >= 0.55. Water should adsorb on Fe(iii), while ACN has hydrophobic interactions with the aromatic rings of 1,3,5-benzenetricarboxylic acid. The adsorption isotherms indicate that water and ACN adsorption were comparable, indicating that MIL-100(Fe) may be applicable as the stationary phase in mixed-mode liquid chromatography. Investigation of solute retention revealed that the order of solute retention is switched depending on x(A). At x(A) <= 0.7, solute retention may be dominated by hydrophobic interactions between the solute and the aromatic rings of the MIL-100(Fe) framework. At x(A) >= 0.7, solute retention cannot be explained simply by the normal-phase or reversed-phase mode. Interaction with Fe(iii) should be taken into account in addition to hydrophobic interactions. Therefore, MIL-100(Fe) is a potential candidate for the stationary phase in mixed mode liquid chromatography.
  ROYAL SOC CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.1039/c9nj03981c
  DOI ID：10.1039/c9nj03981c, ISSN：1144-0546, eISSN：1369-9261, Web of Science ID：WOS:000493080000016
• リン酸エステル配位高分子における特徴的なランタノイドイオン交換特性に関する研究　　　　　　　　　　　　　　　
  半田友衣子
  Volume：30, First page：1, Last page：7, 2019, [Reviewed], [Lead, Corresponding]
• Partition/Ion-Exclusion Chromatographic Ion Stacking for the Analysis of Trace Anions in Water and Salt Samples by Ion Chromatography　　　　　　　　　　　　　　　
  Fouzia Akter; Shingo Saito; Yuiko Tasaki-Handa; Masami Shibukawa
  Analytical Sciences, Volume：34, Number：3, First page：369, Last page：373, 2018, [Reviewed], ［Domestic magazine］
  A new analytical methodology for a simple and efficient on-line preconcentration of trace inorganic anions in water and salt samples prior to ion chromatographic determination is proposed. The preconcentration method is based on partition/ion-exclusion chromatographic ion stacking (PIEC ion stacking) with a hydrophilic polymer gel column containing a small amount of fixed anionic charges. The developed on-line PIEC ion stacking-ion chromatography method was validated by recovery experiments for the determination of nitrate in tap water in terms of both accuracy and precision, and the results showed the reliability of the method. The method proposed was also successfully applied to the determination of trace impurity nitrite and nitrate in reagent-grade salts of sodium sulfate. A low background level can be achieved since pure water is used as the eluant for the PIEC ion stacking. It is possible to reach sensitive detection at sub-mu g L-1 levels by on-line PIEC ion stacking-ion chromatography.
  JAPAN SOC ANALYTICAL CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.2116/analsci.34.369
  DOI ID：10.2116/analsci.34.369, ISSN：0910-6340, eISSN：1348-2246, ORCID：49906916, PubMed ID：29526907, SCOPUS ID：85043362628, Web of Science ID：WOS:000429634200018
• Recovery of lithium from salt-brine eluates by direct crystallization as lithium sulfate　　　　　　　　　　　　　　　
  Kenta Ooi; Akinari Sonoda; Yoji Makita; Ramesh Chitrakar; Yuiko Tasaki-Handa; Tetsuya Nakazato
  Hydrometallurgy, Volume：174, First page：123, Last page：130, 2017, [Reviewed]
  Brine from natural salt lakes (salt brine) is an important source of lithium; consequently the recovery of lithium from brine eluates prepared through Li+ adsorption-desorption is economically important. The present paper describes a study on the direct crystallization of LiSO4 center dot H2O from synthetic and real salt-brine eluates.Thermal evaporation of a sulfate-type synthetic eluate (1400 mM Li+, 61 mM Na+, 6.7 mM K+, 16.7 mM Mg2(+), and 10.0 mM Mn2+), to a degree of concentration (D-con) in excess of 13, produced high purity (97%) Li2SO4 center dot H2O crystals in 54% yield. The addition of ethanol to the eluate resulted in an increased yield of Li2SO4 center dot H2O crystals, but these crystals were of lower purity due to the co-precipitation of other metal sulfates.Two types of eluate were prepared by the batchwise adsorption of Li+ from brine followed by desorption with 2 M sulfuric acid. Evaporation of an eluate with a Li+ concentration of 1370 mM to a D-con of 8.6 at 323 K produced high-purity (97%) Li(2)SO(4)4 center dot H2O crystals in 43% yield after the CaSO4 center dot 2H(2)O had been removed at a D-con, of around 3. The evaporation of the eluate to dryness at 323 K followed by rinsing with water afforded LiSO4 center dot H2O crystals in 83% yield and in 84% purity. This simple evaporation method can be applied to lithium extraction from salt lakes in arid areas.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.hydromet.2017.10.007
  DOI ID：10.1016/j.hydromet.2017.10.007, ISSN：0304-386X, eISSN：1879-1158, ORCID：49906919, Web of Science ID：WOS:000416195200016
• Phosphoester Coordination Polymer for the Mutual Separation of Lanthanide Ions　　　　　　　　　　　　　　　
  Tasaki-Handa, Yuiko; Ooi, Kenta; Narita, Hirokazu; Tanaka, Mikiya; Waeisakai, Akihiro
  Bunseki Kagaku, Volume：66, Number：11, First page：783, Last page：796, 2017, [Reviewed], [Lead, Corresponding]
  Ion-exchange and fractional precipitation using phosphorster coordination polymers have been studied to develop an environmental friendly lanthanide separation method, where only water is used as a solvent. In an ion-exchange system, high selectivity has been found in the lanthanide series. In addition, the selectivity changes depending on the ion exchange rate, which is likely to be caused by the contributions of both "electrostatic interaction between metal ions and phosphorester ligands" and "size matching of the ingoing ion to the framework of the coordination polymer". Such a mechanism may be feasible because the framework is formed by a lanthanide-selective phophoester and it is moderately rigid, which is not observed either in solvent extraction and conventional ion exchange systems. Furthermore, fabrication of phosphorester coordination polymers has been demonstrated: grain powders of phosphorester coordination polymer can be transformed to a monolithic structure through organogel formation and lypholization. As a consequence, the distribution coefficients and kinetic constant of ion exchange have been improved. Finally, successful fractional precipitation of Nd3+ and Dy3+ in an aqueous solution has been demonstrated.
  JAPAN SOC ANALYTICAL CHEMISTRY, Japanese, Scientific journal
  DOI：https://doi.org/10.2116/bunsekikagaku.66.783
  DOI ID：10.2116/bunsekikagaku.66.783, ISSN：0525-1931, ORCID：49906918, Web of Science ID：WOS:000417010200002
• Modelling of column lithium desorption from Li+-loaded adsorbent obtained by adsorption from salt brine　　　　　　　　　　　　　　　
  Kenta Ooi; Yoji Makita; Akinari Sonoda; Ramesh Chitrakar; Yuiko Tasaki-Handa; Tetsuya Nakazato
  Hydrometallurgy, Volume：169, First page：31, Last page：40, 2017, [Reviewed]
  Desorption technology is important to fabricate the economical process for Li+ recovery from brine by adsorption method, but there have been no systematic studies on the column Li+ desorption. The purpose of this paper is to find the elution conditions to have the eluate with high Li+ concentration in a short time, from which Li2CO3 can be precipitated without pre-concentration. The promising conditions of column Li+ desorption could be proposed on the bases of column desorption experiments and model calculations.The natural salt brine (pH 6.8) containing 021 M (1 M = 1 mol dm(-3)) Li+, 2.7 M Na+, 0.51 MK+,1.3 M Mg2+, 5.4 M Cl-, and 0.25 M SO42- was used for the Li+ adsorption. The granulated adsorbent sieved to 0.42-0.71 or 0.71-1.0 mm was prepared with colloidal silica as a binder. The Li+-loaded adsorbents were prepared by treating the granulated adsorbent with the NaHCO3 added brine by a batch method. The column elution experiments were carried out by passing HCI or H2SO4 solutions with different concentrations through the Li+-loaded adsorbents at different flow rates.A model consisting of Li+ migration in the solid phase and of surfaceli H+/Li+ exchange was proposed for the analysis of desorption behavior. The calculated elution curves well approximated the experimental ones when the effective acid concentration and the elution delay were considered. These approximations may be caused by the influence of the other metal ions co-adsorbed from brine. The calculation showed that the elution by passing a 2 M add solution at a space velocity of 10/h up to 2 bed volume produces the eluate of high Li+ concentration (1.15 M) with high Li+ recovery (87%). This process has the advantages of eliminating the step of pre-concentration of eluate for precipitation and reducing the acid consumption. (C) 2016 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.hydromet.2016.11.012
  DOI ID：10.1016/j.hydromet.2016.11.012, ISSN：0304-386X, eISSN：1879-1158, ORCID：49906917, Web of Science ID：WOS:000401878200005
• Selective Crystallization of Phosphoester Coordination Polymer for the Separation of Neodymium and Dysprosium: A Thermodynamic Approach　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Yukie Abe,; Kenta Ooi,; Hirokazu Narita,; Mikiya Tanaka,; Akihiro Wakisaka
  Journal of Physical Chemistry B, Volume：120, Number：49, First page：12730, Last page：12735, 2016, [Reviewed], [Lead, Corresponding], ［International magazine］
  Thermodynamics of the formation of coordination polymers (CPs) or metal-organic frameworks (MOFs) has not been focused on, whereas many CPs or MOFs have been synthesized in a solution. With a view of separating Nd3+ and Dy3+ in an aqueous solution, we demonstrate that crystallization of the CPs of Nd3+ and Dy3+ based on dibutyl phosphoric acid (Hdbp) can be thermodynamically described; crystallization yields of [Ln(dbp)(3)] (Ln = Nd or Dy) complex are predicted well using a simple calculation, which takes the apparent solubility products (K-sp(a)) for [Ln(dbp)(3)] and the acid dissociation constant of Hdbp into account. The K-sp(a) values of [Nd(dbp)(3)] and [Dy(dbp)(3)] are experimentally determined to be (1.3 +/- 0.1) X 10(-14) and (2.9 +/- 0.4) X 10(-18) M-4, respectively, at 20 degrees C. The ratio of these K-sp(a) values, that is, ca. 4500, is significantly larger than the ratio of the solubility products for inorganic salts of Nd3+ and Dy3+. Therefore, Nd3+ and Dy3+ are selectively crystallized in an aqueous solution via the formation of CPs. Under optimized conditions, Dy3+ crystallization is preferable, whereas Nd3+ remains in the solution phase, where the ratio of the Dy molar content to the total metal content (i.e., Nd + Dy) in the crystal is higher than 0.9. The use of acids, such as HCl or HNO3, has no practical impact on the separation in an aqueous solution.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/acs.jpcb.6b09450
  DOI ID：10.1021/acs.jpcb.6b09450, ISSN：1520-6106, eISSN：1520-5207, ORCID：49906921, PubMed ID：27973821, Web of Science ID：WOS:000390072200031
• Fabrication of a monolithic cryogel from the cyclohexane organogel of a coordination polymer based on a phosphoester　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Yukie Abe; Kenta Ooi
  Rsc Advances, Volume：6, Number：75, First page：71404, Last page：71408, 2016, [Reviewed], [Lead, Corresponding]
  Since coordination polymers (CPs) are generally obtained as fine powders, the fabrication of a CP is an issue that should be addressed. A monolithic CP was successfully prepared through the lyophilization of a cyclohexane organogel of [Sm(dehp)(3)] consisting of Sm3+ and di-(2-ethylhexyl)phosphoric acid. The crystalline domains of the CP possibly act as cross-linking points, and the crystallization of cyclohexane is likely to generate the void space in the resulting cryogels. The architecture of the material can be varied by changing the volume ratio of cyclohexane to [Sm(dehp)(3)]. While the morphology observed through the scanning electron microscope was completely different from the as-synthesized material, powder X-ray diffraction analysis revealed that the crystalline structure did not change. The distribution coefficient and kinetic constant of ion exchange in the lanthanide series were improved by cryogel formation.
  ROYAL SOC CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.1039/c6ra12477a
  DOI ID：10.1039/c6ra12477a, ISSN：2046-2069, ORCID：49906920, Web of Science ID：WOS:000381513100081
• Separation of neodymium and dysprosium by forming coordination polymers　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa, Yukie Abe,, Kenta Ooi,, Hirokazu Narita,, Mikiya Tanaka,, Akihiro Wakisaka
  Separation and Purification Technology, Volume：157, First page：162, Last page：168, 2016, [Reviewed], [Lead, Corresponding]
  The increasing demand for neodymium (Nd)-magnets containing dysprosium (Dy) has necessitated the recovery of Nd and Dy from magnet scraps to ensure their supply. Thus, it is required to develop an environmentally friendly method for separating Nd3+ and Dy3+. Herein, we show that the formation of coordination polymers based on di(2-ethylhexyl) phosphoric acid (HDEHP) enables the fractional precipitation of Nd and Dy in ethanol-water solution because the solubility of the Dy coordination polymer is significantly lower than that of the Nd coordination polymer owing to coordination preference. The separation performance was found to be better in HNO3 than in HCl media. The characterization of the solid and liquid phases obtained from the Nd3+ and Dy3+ precipitation systems suggested that Nd3+-NO3- association inhibits the formation of Nd coordination polymers. The partial replacement of dehp(-) in the Nd coordination polymer by NO3- may weaken the binding strength of the framework, resulting in higher solubility. In addition, the formation of Nd(NO3)(2+) in solution may shift the equilibrium against the precipitation reaction. However, when Nd3+ and Dy3+ coexist, Nd3+ precipitation is not accompanied by the replacement of dehp(-) by NO3- in the solid phase. This may be attributed to the incorporation of Nd3+ into the framework of the Dy coordination polymer. We conclude that the formation of Nd(NO3)(2+) shifts the solution equilibrium and plays an important role in enhancing the separation performance in HNO3 than in HCl when Nd3+ and Dy3+ coexist. (C) 2015 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.seppur.2015.11.038
  DOI ID：10.1016/j.seppur.2015.11.038, ISSN：1383-5866, eISSN：1873-3794, ORCID：26235338, Web of Science ID：WOS:000368868600017
• Modelling of column lithium adsorption from pH-buffered brine using surface Li+/H+ ion exchange reaction　　　　　　　　　　　　　　　
  Ooi, Kenta; Makita, Yoji; Sonoda, Akinari; Chitrakar, Ramesh; Tasaki-Handa, Yuiko; Nakazato, Tetsuya
  Chemical Engineering Journal, Volume：288, First page：137, Last page：145, 2016, [Reviewed]
  A model consisting of surface Li+/H+ exchange followed by Li+ transport with linear driving force (LDF) approximation was proposed for the analysis of column Li+ adsorption from pH-buffered brine on granulated H1.33Mn1.67O4. The advection equations for Li+ and OH-and the equations for Li+ and H+ transports in the solid phase were numerically solved using the finite difference technique, taking into account the acidbase properties of brine. The breakthrough curve and the pH change of the eluate could be calculated using the ion exchange capacity (Q(0)), ion exchange selectivity (K-c), and Li+ diffusivity in the solid phase (D-s). The calculated breakthrough curves had good approximations to the experimental ones with the values of Q(0) = 3.0 mol/kg, K-c = 0.75, and D-s = 5 x 10(-9) m(2)/h; these values agreed comparatively well with those determined individually by the column and batch adsorptions with H1.33Mn1.67O4 type adsorbent (Qo = 3.4 mol/kg, = 0.1, and D-s = 4.2 x 10(-9) m(2)/h, respectively). The rate of Li+ recovery from the brine and the Li+ saturation degree of adsorbent, which are important for designing the column Li+ recovery process, could be evaluated from the breakthrough curves calculated at different flow rates. (C) 2015 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE SA, English, Scientific journal
  DOI：https://doi.org/10.1016/j.cej.2015.11.092
  DOI ID：10.1016/j.cej.2015.11.092, ISSN：1385-8947, eISSN：1873-3212, ORCID：26235337, Web of Science ID：WOS:000370085900014
• Steric effect involved in Ln(3+)/Ce3+ exchange in a coordination polymer based on di(2-ethylhexyl)phosphoric acid　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Yukie Abe; Kenta Ooi; Mikiya Tanaka; Akihiro Wakisaka
  Dalton Transactions, Volume：43, Number：4, First page：1791, Last page：1796, 2014, [Reviewed], [Lead, Corresponding], ［International magazine］
  Coordination polymers can be attractive ion exchange materials because of their crystallinity and semi-flexibility, which are rather opposing properties, and play integral and synergistic roles in introducing unique ion-exchange behavior. In this paper, Ln(3+)/Ce3+ exchange (Ln(3+) = Nd3+, Gd3+, Dy3+, or Lu3+) in a coordination polymer, [Ce(dehp)(3)], based on di(2-ethylhexyl)phosphoric acid (Hdehp) is studied by distribution coefficient measurements, ion-exchange isotherms, Kielland plot analysis, and morphology observation. The ion-exchange selectivity is in the order Nd3+ < Gd3+ < Dy3+ < Lu3+ when a small amount of Ln(3+) is loaded, but Lu3+ approximate to Nd3+ < Gd3+ approximate to Dy3+ for a high loading ratio. The Kielland plot suggests that a steric effect is involved in the reactions, which becomes stronger in the order of Nd3+/Ce3+ < Gd3+/Ce3+ < Dy3+/Ce3+ < Lu3+/Ce3+ for exchange systems. This trend is attributable to the differences in the ionic sizes between an incoming Ln(3+) and original Ce3+. Scanning electron microscopy observations reveal the generation of a new phase via the Ln(3+)/Ce3+ exchange. Such a phenomena results from solid-solid transformation, rather than dissolution-recrystallization. The small steric strain in the Nd3+/Ce3+ system leads to the formation of a Nd3+- and-Ce3+ solid-solution, whereas the morphological change is possibly restrained by the strong strain caused by loaded Ln(3+) with an ionic size significantly smaller than the original Ce3+.
  ROYAL SOC CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.1039/c3dt52451e
  DOI ID：10.1039/c3dt52451e, ISSN：1477-9226, eISSN：1477-9234, ORCID：26235343, PubMed ID：24247156, Web of Science ID：WOS:000328885300036
• Ln(3+) Adsorption into an Yttrium-Hdehp Coordination Polymer through Exchange with Coordinated Yttrium Ion　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Hiroaki Sato; Masaki Torimura; Mikiya Tanaka; Akihiro Wakisaka
  Solvent Extraction Research and Development-Japan, Volume：21, First page：83, Last page：87, 2014, [Reviewed], [Lead, Corresponding]
  An exchange between lanthanide ions (Ln(3+)) in a solution and coordinated yttrium ions (Y3+) takes place in a coordination polymer (CP) formed by Y3+ and di-(2-ethylhexyl) phosphoric acid (Hdehp). Through this cation exchange, Ln(3+) is adsorbed on the CP depending on the coordination power with Hdehp. Accordingly, the Ln(3+) with the larger atomic number is more preferably adsorbed into the CP. This adsorption is affected by the concentration of H+, CH+, in the solution. For example, at CH+ =10(-5) M, y(3+) is replaced directly by the incoming Ln(3+) with a 1:1 stoichiometry. In a limited higher CH+ region, the CP becomes a gel and the Ln(3+)/Y3+ exchange is enhanced therein.
  JAPAN ASSOC SOLVENT EXTRACTION, English, Scientific journal
  DOI：https://doi.org/10.15261/serdj.21.83
  DOI ID：10.15261/serdj.21.83, ISSN：1341-7215, ORCID：26235342, Web of Science ID：WOS:000336240500010
• Lanthanide ion exchange properties of a coordination polymer consisting of di (2-ethylhexyl) phosphoric acid and trivalent metal ions (Ce3+, Fe3+, or Al3+)　　　　　　　　　　　　　　　
  Kenta Ooi; Yuiko Tasaki-Handa; Yukie Abe; Akihiro Wakisaka
  Dalton Transactions, Volume：43, Number：12, First page：4807, Last page：4812, 2014, [Reviewed], [Corresponding], ［International magazine］
  Three kinds of coordination polymers ([M(dehp)(3)], M = Ce, Fe, or Al) were prepared by mixing the sodium form (Na(dehp)) of di(2-ethylhexyl) phosphoric acid and MCl3 in an ethanol-water binary mixture. They have monoclinic crystalline structure with similar lattice parameters. The lanthanide ion (Ln(3+) = La3+, Sm3+, Dy3+, or Yb3+) exchange properties were studied in a 20 : 80 vol% ethanol-water binary mixture containing 2 mM Ln(NO3)(3) at room temperature. The rate of Ln(3+) adsorption is relatively slow; it requires over 3 weeks to reach equilibrium. [M(dehp)(3)] has different Ln(3+) affinities depending on the kind of central metal ions: the affinity order at 3 week adsorption is Yb3+ < La3+ < Dy3+ < Sm3+ for [Ce(dehp)(3)], La3+ < Sm3+ < Dy3+ < Yb3+ for [Fe(dehp)(3)], and La3+ < Sm3+, Dy3+, Yb3+ for [Al(dehp)(3)]. The difference in affinity order can be explained by two factors: the coordination preference and steric strain caused by the polymeric structure. The chemical and structural analyses suggested that the Ln(3+) adsorption progresses first by the central M3+/Ln(3+) exchange, followed by a morphological change to a rod-like or fibrous form by a solid phase reaction. In the case of [Fe(dehp)(3)], the eluted Fe3+ may be hydrolyzed and precipitated as amorphous iron hydroxide.
  ROYAL SOC CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.1039/c3dt53407c
  DOI ID：10.1039/c3dt53407c, ISSN：1477-9226, eISSN：1477-9234, ORCID：26235341, PubMed ID：24477321, Web of Science ID：WOS:000332390500023
• Environmentally friendly separation of dysprosium and neodymium by fractional precipitation of coordination polymers　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Yukie Abe; Kenta Ooi; Hirokazu Narita; Mikiya Tanaka; Akihiro Wakisaka
  Rsc Advances, Volume：4, Number：39, First page：20496, Last page：20498, 2014, [Reviewed], [Lead, Corresponding]
  Against a backdrop of increasing demand, the recovery of neodymium (Nd) and especially dysprosium (Dy) from manufacturing scraps and used magnets has necessitated the development of Nd/Dy separation technologies. To this end, we suggest a simple and environmentally friendly separation method by fractional precipitation of coordination polymers (CPs)-extended complexes of metal ions and organic ligands. With the di(2-ethylhexyl) phosphoric acid ligand functioning as a precipitant, Dy was exclusively precipitated as a CP due to its precipitation equilibrium that is considerably different from that of Nd.
  ROYAL SOC CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.1039/c4ra00257a
  DOI ID：10.1039/c4ra00257a, ISSN：2046-2069, eISSN：2046-2069, ORCID：26235340, Web of Science ID：WOS:000336079200053
• Central metal ion exchange in a coordination polymer based on lanthanide ions and di(2-ethylhexyl)phosphoric acid: Exchange rate and tunable affinity　　　　　　　　　　　　　　　
  Tasaki-Handa, Yuiko; Abe, Yukie; Ooi, Kenta; Tanaka, Mikiya; Wakisaka, Akihiro
  Journal of Colloid and Interface Science, Volume：413, First page：65, Last page：70, 2014, [Reviewed], [Lead, Corresponding], ［International magazine］
  In this paper the exchange of lanthanide(III) ions (Ln3(+)) between a solution and a coordination polymer (CP) of di(2-ethylhexyl)phosphoric acid (Hdehp), [Ln(dehp)(3)], is studied. Kinetic and selectivity studies suggest that a polymeric network of [Ln(dehp)(3)] has different characteristics than the corresponding monomeric complex. The reaction rate is remarkably slow and requires over 600 h to reach in nearly equilibrium, and this can be explained by the polymeric crystalline structure and high valency of Ln3(+). The affinity of the exchange reaction reaches a maximum with the Ln3(+) possessing an ionic radius 7% smaller than that of the central Ln3(+), therefore, the affinity of the [Ln(dehp)(3)] is tunable based on the choice of the central metal ion. Such unique affinity, which differs from the monomeric complex, can be explained by two factors: the coordination preference and steric strain caused by the polymeric structure. The latter likely becomes predominant for Ln(3+) exchange when the ionic radius of the ion in solution is smaller than the original Ln(3+) by more than 7%. Structural studies suggest that the incoming Ln(3+) forms a new phase though an exchange reaction, and this could plausibly cause the structural strain. (C) 2013 Elsevier Inc. All rights reserved.
  ACADEMIC PRESS INC ELSEVIER SCIENCE, English, Scientific journal
  DOI：https://doi.org/10.1016/jjcis.2013.09.018
  DOI ID：10.1016/jjcis.2013.09.018, ISSN：0021-9797, eISSN：1095-7103, ORCID：26235339, PubMed ID：24183431, Web of Science ID：WOS:000327168800009
• 氷を用いる分離と計測
  岡田 哲男; 半田 友衣子
  Volume：71, First page：29, Last page：38, 2013, [Reviewed]
  Scientific journal
• Developments of Separation and Analytical Methodologies with Ice as Functional Material　　　　　　　　　　　　　　　
  高橋さつき; 田崎友衣子; 岡田哲男
  Volume：71, First page：29, Last page：38, 2013
  氷を一種の機能性材料と考えることで, アイスクロマトグラフィー, その発展系であるキラルアイスクロマトグラフィーを始め, 新しい分離・計測化学を展開することができる. 本稿では, 著者らが最近数年間行っている,「氷ではかる」研究を紹介する. 分離の他に, 分光測定デバイスとしての氷, 氷マイクロリアクターなどについて述べる. また,「氷ではかる」ことにより, 氷が関わる現象を理解することもできる. 氷界面での擬似液相, ドープ氷中の共存液相で起きる化学反応, 電解質ドープ氷中でのイオンの局所構造変化などに関して言及する.We have developed a variety of analytical methods with ice as a functional material, which include ice chromatography, chiral ice chromatography, optical measurement with an ice-cladding liquid-core waveguide, microreactors, etc. These methods developed with ice are briefly reviewed. Also,the measurements with ice have allowed the exploration of interesting phenomena related to ice, involving quasi-liquid later formation at the interface between ice and an organic solvent, facilitation of some chemical reactions in the liquid phase coexistent with ice, specific ion hydration at the temperature below the eutectic point of the system etc. This clearly suggests that the measurements with ice lead to the understanding of ice.
  Japanese
  ISSN：1880-7593, CiNii Articles ID：120005228424, CiNii Books ID：AA12122962
• Tunable Selectivity of Lanthanide Ion Exchange within a Coordination Polymer　　　　　　　　　　　　　　　
  Yuiko Tasaki-Handa; Kenta Ooi; Mikiya Tanaka; Akihiro Wakisaka
  Analytical Sciences, Volume：29, Number：7, First page：685, Last page：687, 2013, [Reviewed], [Lead, Corresponding], ［Domestic magazine］
  The exchange of lanthanide(III) ions (Ln(3+)) between a solution and a coordination polymer (CP) formed by cerium(III) or samarium(III) ion and an organophosphorous ligand has been studied. The CPs exhibit distinctive Ln(3+) affinity that varies with a small change in its framework, depending on the central Ln(3+).
  JAPAN SOC ANALYTICAL CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.2116/analsci.29.685
  DOI ID：10.2116/analsci.29.685, ISSN：0910-6340, eISSN：1348-2246, ORCID：26235344, PubMed ID：23842409, Web of Science ID：WOS:000322353800001
• Up to 4 Orders of Magnitude Enhancement of Crown Ether Complexation in an Aqueous Phase Coexistent with Ice　　　　　　　　　　　　　　　
  Yuiko Tasaki; Tetsuo Okada
  Journal of the American Chemical Society, Volume：134, Number：14, First page：6128, Last page：6131, 2012, [Reviewed], [Lead]
  Ice chromatography measurements have revealed anomalous enhancements of crown ether complexation in a liquid phase coexistent with ice. The 4 orders of magnitude enhancement was confirmed for the complexation of dibenzo-24-crown-8 in sub-pm-sized liquid inclusions formed in ice doped with <1 mM NaCl or KCl. This enhancement became less pronounced with increasing dopant concentration.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/ja301989d
  DOI ID：10.1021/ja301989d, ISSN：0002-7863, ORCID：26235346, Web of Science ID：WOS:000302524800019
• Hydration of ions and salt crystallization in liquid phase coexistent with ice at temperature below eutectic point　　　　　　　　　　　　　　　
  Makoto Harada; Yuiko Tasaki; Hui Qu; Tetsuo Okada
  Rsc Advances, Volume：2, Number：2, First page：461, Last page：466, 2012, [Reviewed]
  X-ray absorption fine structure (XAFS) clearly indicates the existence of hydrated Br(-) in a frozen aqueous RbBr solution at the temperatures lower than the eutectic point (t(eu)) of the system. The relative population of hydrated Br(-) decreases with increasing concentration of RbBr in an original solution, and Br(-) consisting of the RbBr crystal lattice becomes dominant at the higher concentration of RbBr. This implies the existence of the liquid phase at the subeutectic temperatures. Continuous XAFS measurements over ca 6 h detect the progress of the RbBr crystallization. The analysis based on the populations of hydrated Br(-) and Br(-) in the RbBr crystal suggests that the ions on the surface of the salt crystal are partially hydrated. These strongly imply that the metastable liquid phase is in contact with salt crystals at the temperature below t(eu). Since impurities such as a salt are accumulated along the grain boundaries of ice crystals, the metastable liquid phase should thus be present together with the accumulated salt crystals.
  ROYAL SOC CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.1039/c1ra00801c
  DOI ID：10.1039/c1ra00801c, ISSN：2046-2069, ORCID：26235345, Web of Science ID：WOS:000299087000016
• Electrolyte-Doped Ice as a Platform for Atto- to Femtoliter Reactor Enabling Zeptomol Detection　　　　　　　　　　　　　　　
  Hashimoto, Takuya; Tasaki, Yuiko; Harada, Makoto; Okada, Tetsuo
  Analytical Chemistry, Volume：83, Number：10, First page：3950, Last page：3956, 2011, [Reviewed]
  Rapid freezing of an aqueous electrolyte in liquid nitrogen provides an effective way to fabricate uniform-sized liquid pores with the radius ranging from 0.15 to 3 mu m (<1% rsd), corresponding to atto- to femtoliter volumes. The size of liquid pores depends on the temperature, and the concentration and type of a salt incorporated into an original aqueous solution. When the concentration of a salt is kept lower than 20 mM, liquid pores are discretely distributed in an ice matrix. Unlike usual small spaces accommodating liquid water, the pore size is tunable and continuously variable by changing the above experimental parameters. The liquid pore has been utilized as microreactors, in which the fluorescent complexation between Mg2+ and 8-hydroxyquinoline-5-sulfonic acid (HQS) is studied. Under the optimum condition, fluorescence from Mg2+ ions in the zeptomol level confined in a liquid pore is detected.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/ac200785n
  DOI ID：10.1021/ac200785n, ISSN：0003-2700, eISSN：1520-6882, ORCID：26235348, Web of Science ID：WOS:000290466000045
• Control of Ice Chromatographic Retention Mechanism by Changing Temperature and Dopant Concentration　　　　　　　　　　　　　　　
  Yuiko Tasaki; Tetsuo Okada
  Analytical Chemistry, Volume：83, Number：24, First page：9593, Last page：9599, 2011, [Reviewed], [Lead]
  A liquid phase coexists with solid water ice in a typical binary system, such as NaCl-water, in the temperature range between the freezing point and the eutectic point (t(eu)) of the system. In ice chromatography with salt-doped ice as the stationary phase, both solid and liquid phase can contribute to solute retention in different fashions; that is, the solid ice surface acts as an adsorbent, while a solute can be partitioned into the liquid phase. Thus, both adsorption and partition mechanisms can be utilized for ice chromatographic separation. An important feature in this approach is that the liquid phase volume can be varied by changing the temperature and the concentration of a salt incorporated into the ice stationary phase. Thus, we can control the relative contribution from the partition mechanism in the entire retention because the liquid phase volume can be estimated from the freezing depression curve. Separation selectivity can thereby be modified. The applicability of this concept has been confirmed for the solutes of different adsorption and partition abilities. The predicted retention based on thermodynamics basically agrees well with the corresponding experimental retention. However, one important inconsistency has been found. The calculation predicts a step-like discontinuity of the solute retention at t(eu) because the phase diagram suggests that the liquid phase abruptly appears at t(eu) when the temperature increases. In contrast, the corresponding experimental plots are continuous over the wider range including the subeutectic temperatures. This discrepancy is explained by the existence of the liquid phase below few t(eu). A difference between predicted and measured retention factors allows the estimation of the volume of the subeutectic liquid phase.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/ac202378m
  DOI ID：10.1021/ac202378m, ISSN：0003-2700, ORCID：26235347, Web of Science ID：WOS:000297946900060
• Characterization of Salt-doped Ice near the Eutectic Temperature
  Yuiko Tasaki; Makoto Harada; Tetsuo Okada
  Physics and Chemistry of Ice, First page：441, Last page：445, 2010, [Reviewed], [Lead]
  International conference proceedings
• Advances of Analytical Methodologies with Ice as a Functional Material　　　　　　　　　　　　　　　
  T. Okada; Y. Tasaki; K. Sugiya; T. Hashimoto; H. Qui
  Physics and Chemistry of Ice, First page：95, Last page：100, 2010, [Reviewed]
  International conference proceedings
• Ice chromatography: current progress and future developments　　　　　　　　　　　　　　　
  Tetsuo Okada; Yuiko Tasaki
  ANALYTICAL AND BIOANALYTICAL CHEMISTRY, Volume：396, Number：1, First page：221, Last page：227, Jan. 2010, [Reviewed]
  Ice chromatography, in which water-ice particles are employed as a chromatographic stationary phase, has proven an efficient technique for probing the solution/ice interface. The preparation of fine ice particles has allowed us to not only obtain higher-resolution separation but also investigate the molecular processes occurring on the ice surface in more detail. Chromatographic investigations have revealed that two or more hydrogen bonds are simultaneously formed between a solute and the dangling bonds on the ice surface when the solute gives measurable retention. Several compounds, including estrogens, amino acids, and acyclic polyethers, have been successfully separated by ice chromatography with a hexane-based mobile phase. In addition, this method effectively probes the surface melting of the ice stationary phase and the liquid phase that coexists with water ice at thermodynamic equilibrium. The thickness of the surface liquid layer and the size of the liquid phase that grows inside an ice particle have been evaluated. The perspectives of this method are also discussed.
  SPRINGER HEIDELBERG, English
  DOI：https://doi.org/10.1007/s00216-009-3050-z
  DOI ID：10.1007/s00216-009-3050-z, ISSN：1618-2642, ORCID：26235351, Web of Science ID：WOS:000272564100025
• Eutectic Transition of Local Structure for Bromide Ion in Bulk and on Surface of Doped Ice　　　　　　　　　　　　　　　
  Yuiko Tasaki; Makoto Harada; Tetsuo Okada
  Journal of Physical Chemistry C, Volume：114, Number：29, First page：12573, Last page：12579, 2010, [Reviewed], [Lead]
  A number of experimental and theoretical studies have suggested that the surface of water-ice is liquidlike. Tons in a liquidlike layer should be hydrated, whereas they are included in a salt crystal if the surface of ice is solidlike. Thus, the local structure of an ion can be a useful probe for the state of the ice surface. X-ray absorption line structure has allowed us to determine the local structures of Br(-) in the bulk and on the surface of water-ice simply by adjusting the incident angle of X-ray. In the bulk of ice doped with RbBr of >= 3 mM, Br(-) is present in the crystal lattice of RbBr below the eutectic point (t(eu)), but is completely hydrated above t(eu). However, a higher transition temperature has been found for 1 mM RbBr, and, in addition, the hydration structure of Br(-) is kept even at the temperatures lower than t(eu). In contrast, the spectra for Br(-) obtained from the surface of doped-ice involve strong contributions from the RbBr crystal even above t(eu). Thus, against the expectation from the surface liquid layer on pure ice, the surface of RbBr-doped ice is waterless compared to its bulk as far as ion hydration is concerned. The spectra on the surface suggest some specific structures at higher temperatures, where the contribution from the crystal should become marginal because of the complete dissolution of RbBr in a solution phase. These specific spectral features can be successfully explained assuming the formation of a ID RbBr crystal with hydrated Rb(+).
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/jp102246f
  DOI ID：10.1021/jp102246f, ISSN：1932-7447, ORCID：26235350, Web of Science ID：WOS:000280070900029
• Chiral Ice Chromatography　　　　　　　　　　　　　　　
  Shamoto, Taiki; Tasaki, Yuiko; Okada, Tetsuo
  Journal of the American Chemical Society, Volume：132, Number：38, First page：13135, Last page：13137, 2010, [Reviewed]
  Water-ice particles simultaneously doped with beta-cyclodextrin and a salt enabled chromatographic separation of enantiomers without synthetic processes, and enhanced chiral recognition occurring in the liquid-water phase coexistent with the solid-ice phase.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/ja1055214
  DOI ID：10.1021/ja1055214, ISSN：0002-7863, eISSN：1520-5126, ORCID：26235349, Web of Science ID：WOS:000282304000013
• Facilitation of Applicability in Ice Chromatography by Mechanistic Considerations and by Preparation of Fine Water-Ice Stationary Phase　　　　　　　　　　　　　　　
  Yuiko Tasaki; Tetsuo Okada
  ANALYTICAL CHEMISTRY, Volume：81, Number：3, First page：890, Last page：897, Feb. 2009, [Reviewed], [Lead]
  We have, in previous papers, demonstrated that some solute is adsorbed on the ice surface at temperatures below -5 degrees C by the hydrogen-bond formation between the polar groups in the solute and the dangling bonds on the water-ice surface. However, the separation efficiency of this method, named ice chromatography, was seriously restricted principally due to the large sizes of water-ice particles used as a stationary phase. We have devised a convenient method to prepare finer ice particles with diameters of -10 mu m. This stationary phase has provided much larger theoretical plate numbers (N = 1500) than that prepared in the previous way (N = 250) and has allowed various applications such as separation of amino acid derivatives, poly(oxyethylene) oligomers, and estrogen. The improved separation performance allows us to discuss retention mechanisms in more detail and to see subtle differences in the retentivity between solutes.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/ac802229t
  DOI ID：10.1021/ac802229t, ISSN：0003-2700, eISSN：1520-6882, ORCID：26235353, Web of Science ID：WOS:000262915100010
• Adsorption-Partition Switching of Retention Mechanism in Ice Chromatography with NaCl-doped Water-Ice　　　　　　　　　　　　　　　
  Yuiko Tasaki; Tetsuo Okada
  ANALYTICAL SCIENCES, Volume：25, Number：2, First page：177, Last page：181, Feb. 2009, [Reviewed], [Lead]
  A liquid phase is coexistent with water-ice prepared from a brine solution at any temperature above the eutectic point of the system. Ice chromatographic measurements have provided information on the liquid phase in an ice particle prepared from NaCl. The growth of the liquid phase causes the alternation of the dominant separation mechanism from the adsorption on the ice surface to the partition into the liquid phase, resulting in an increase in the retention of a water-soluble probe. When the liquid phase is developed, the retention is well explained by the partition coefficient determined with bulk solvents, suggesting that all of the liquid pools in a water-ice particle are connected to each other. In contrast, only a part of the liquid pools act as a stationary phase when the volume of the liquid phase is small. A model, which assumes the homogenous distribution of a salt in an ice particle and spherical shapes of a liquid pool, has allowed the estimation of its size.
  JAPAN SOC ANALYTICAL CHEMISTRY, English, Scientific journal
  DOI：https://doi.org/10.2116/analsci.25.177
  DOI ID：10.2116/analsci.25.177, ISSN：0910-6340, eISSN：1348-2246, ORCID：26235352, Web of Science ID：WOS:000263538100008
• 氷を用いる分離−アイスクロマトグラフィー　　　　　　　　　　　　　　　
  田崎友衣子; 岡田哲男
  First page：922, Last page：928, 2009, [Lead]
  Japanese
• Designs and Analytical Exploitation of Novel Separation Fields　　　　　　　　　　　　　　　
  Tetsuo Okada; Yuiko Tasaki
  BUNSEKI KAGAKU, Volume：57, Number：12, First page：921, Last page：935, Dec. 2008, [Reviewed]
  This paper reviews the designs of novel physical and chemical separation fields principally based on the authors' work. Usual physical fields simultaneously recognize materials and sizes of particles and may therefore result in unnecessarily complex separation in some cases. A physical field incapable of resolving a particular particle property, such as size, must be useful from this point of view. We have devised a Coupled acoustic-gravity field, in which particles are aggregated at a particular position determined only by their acoustic properties. This field has been successfully applied to probe the interior structures of silica gel particles, separation of particles based on materials, the acoustic recognition of counterions in cation-exchange resins etc. Water-ice is related to various phenomena Occurring in the global environment, and therefore the molecular processes taking place at its surface are of broad interest. If water-ice is used as a chromatographic stationary phase, we can effectively probe the molecular interactions at the interface between water-ice and a mobile phase. From this perspective, we have developed ice chromatography and have successfully verified various phenomena involved in retention processes. At temperatures lower than -3 degrees C, solute retention can be explained by the hydrogen bonding of a Solute With the -OH dangling bonds on the water-ice surface. However, the surface of water-ice becomes liquid-like as the temperature is raised; this surface melting has been detected by a drastic change in the dominant retention mechanism from adsorption to partition. Ice chromatographic separation of various compounds, which is realized by the development of an efficient method for fine ice particle preparation, is also presented, involving estrogen, amino acid derivatives, ingredients in green tea leaves etc.
  JAPAN SOC ANALYTICAL CHEMISTRY, Japanese, Scientific journal
  DOI：https://doi.org/10.2116/bunsekikagaku.57.921
  DOI ID：10.2116/bunsekikagaku.57.921, ISSN：0525-1931, ORCID：26235354, Web of Science ID：WOS:000261653200001
• Ice chromatography - Modification of solute retention on water-ice stationary phase　　　　　　　　　　　　　　　
  Yuiko Tasaki; Tetsuo Okada
  JOURNAL OF CHROMATOGRAPHY A, Volume：1189, Number：1-2, First page：72, Last page：76, May 2008, [Reviewed], [Lead]
  Ice chromatography, in which water-ice particles are used as the stationary phase, has high potential as a separation tool, and is an efficient approach to probe the molecular interaction occurring on the water-ice surface. In the present paper, to modify solute retention, several methods are proposed, that is, changing the mobile phase composition, the surface modification of water-ice, and the implantation of functional molecules into water-ice. The retention mechanism of ice chromatography is discussed through these retention modifications. (C) 2007 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.chroma.2007.08.050
  DOI ID：10.1016/j.chroma.2007.08.050, ISSN：0021-9673, eISSN：1873-3778, ORCID：26235356, Web of Science ID：WOS:000255698000009
• Ice chromatographic characterization of thin liquid layer at the interface between water-ice and organic solvent　　　　　　　　　　　　　　　
  Yuiko Tasaki; Tetsuo Okada
  JOURNAL OF PHYSICAL CHEMISTRY C, Volume：112, Number：7, First page：2618, Last page：2623, Feb. 2008, [Reviewed], [Lead]
  The quasi-liquid layer (QLL) on the surface of water-ice has been studied by ice chromatography, in which water-ice particles are used as a stationary phase. We have, in previous papers, demonstrated that solutes are retained on the ice stationary phase with hexane-based mobile phases and have revealed that the hydrogen bonds between a solute and the dangling bonds on the surface of water-ice are responsible for retention at such low temperatures as -12.0 to -5.0 degrees C. However, increasing the temperature allows the shift of the principal retention mechanism from the hydrogen-bond adsorption to the partition into the QLL; this has been confirmed by drastic changes in the retention of probe solutes. The threshold temperature, at which the retention shift occurs, depends on the concentration and type of a polar component added to the mobile phase. Thus, the QLL developed in the present system contains not only water but also a polar component added to the mobile phase. This phenomenon occurs at a temperature much lower than that predicted from the lowering of the freezing point due to the dissolution of a polar component in water and, thus, is a surface process rather than a bulk phase transition.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/jp7105605
  DOI ID：10.1021/jp7105605, ISSN：1932-7447, ORCID：26235355, Web of Science ID：WOS:000253222200058
• Ice Chromatography, A New Physicochemical Approach to Water-Ice Surface　　　　　　　　　　　　　　　
  Y. Tasaki; T. Okada
  Proceedings Whistler 2008 International Snow Science Worksho, First page：1027, Last page：1034, 2008, [Reviewed], [Lead]
  English, International conference proceedings
• Ice Chromatography:Separation with Water-ice　　　　　　　　　　　　　　　
  Tasaki Yuiko; Okada Tetsuo
  Preprints of the Annual Conference, Japanese Society of Snow and Ice, Volume：2007, First page：176, Last page：176, 2007
  THE JAPANESE SOCIETY OF SNOW AND ICE, Japanese
  DOI：https://doi.org/10.14850/jssi.2007.0.176.0
  DOI ID：10.14850/jssi.2007.0.176.0, ISSN：0919-7346, CiNii Articles ID：130005007367
• Ice chromatography. Characterization of water-ice as a chromatographic stationary phase　　　　　　　　　　　　　　　
  Y Tasaki; T Okada
  ANALYTICAL CHEMISTRY, Volume：78, Number：12, First page：4155, Last page：4160, Jun. 2006, [Reviewed], [Lead]
  Water-ice has been characterized as a stationary phase for liquid chromatography. Solutes having two or more polar groups are retained on this stationary phase with THF/hexane as the mobile phase, suggesting that multi-point interactions are required for measurable solute retention. Chromatographic separation of phenols or crown ethers on water-ice is possible. The ice surface is expected to provide two different adsorption sites coming from the OH and O dangling bonds. Although the solute partition into the quasiliquid layer is also considered, the dependence of the retention times on the THF concentration implies that the interaction of solutes with the water-ice surface rather than the partition into the quasiliquid layer is responsible for solute retention. A retention model suggests that the number of adsorption sites for a crown ether depends on its ring size, whereas two sites are involved for the retention of phenols having two hydroxyl groups. Although hydroxyl groups can act as both a hydrogen bond donor and an acceptor, the interaction with the ice OH sites, which are exposed to the surroundings in comparison with the ice O sites, is more important. However, when an acyclic polyether is added to the mobile phase, its adsorption onto the water ice surface allows the creation of the O sites that phenols can approach without steric hindrance. In the presence of the polyethers adsorbed on the ice surface, the retention of phenols is enhanced, whereas crown ethers become less retained due to the competitive adsorption of the polyethers.
  AMER CHEMICAL SOC, English, Scientific journal
  DOI：https://doi.org/10.1021/ac0602470
  DOI ID：10.1021/ac0602470, ISSN：0003-2700, eISSN：1520-6882, ORCID：26235357, Web of Science ID：WOS:000238252600021

• Novel metal-ion adsorbent composed of phosphate-complex aggregates　　　　　　　　　　　　　　　
  TASAKI Yuiko; SATO Hiroaki; TORIMURA Masaki; TANAKA Mikiya; WAKISAKA Akihiro; UYAMA Hiroshi
  Number：60, First page：32, Last page：33, 08 May 2012
  Japanese
  ISSN：0910-2205, CiNii Articles ID：10030627840, CiNii Books ID：AN10379697
• キラルアイスクロマトグラフィーにおける分離機構の解析　　　　　　　　　　　　　　　
  社本泰樹; 田崎友衣子; 岡田哲男
  Volume：59th, 2010
  J-Global ID：201002225302677780
• キラルアイスクロマトグラフィー　　　　　　　　　　　　　　　
  社本泰樹; 田崎友衣子; 岡田哲男
  Volume：71st, 2010
  J-Global ID：201002285496520766
• Ice chromatography : Tool for molecular separation using physicochemical properties of water-ice　　　　　　　　　　　　　　　
  TASAKI Yuiko; OKADA Tetsuo
  Volume：70, Number：4, First page：435, Last page：440, 15 Jul. 2008
  Japanese
  ISSN：0373-1006, CiNii Articles ID：10021091877, CiNii Books ID：AN00131221
• アイスクロマトグラフィーによる電解質ドープ氷表面におけるクラウンエーテル錯形成反応の解析　　　　　　　　　　　　　　　
  田崎友衣子; 岡田哲男
  Volume：24th, 2008
  J-Global ID：200902255171167892
• アイスクロマトグラフィーによる生体物質の分離　　　　　　　　　　　　　　　
  田崎友衣子; 岡田哲男
  Volume：56th, 2007
  J-Global ID：200902215080289632
• アイスクロマトグラフィーによる氷表面での分子間相互作用の解析　　　　　　　　　　　　　　　
  田崎友衣子; 岡田哲男
  Volume：68th, 2007
  J-Global ID：200902265765232177
• アイスクロマトグラフィー　　　　　　　　　　　　　　　
  田崎友衣子; 岡田哲男
  Volume：2005, 2005
  J-Global ID：200902249926511475

• ＰＣＰ／ＭＯＦおよび各種多孔質材料の作り方，使い方，評価解析　　　　　　　　　　　　　　　
  [Joint work]
  Oct. 2019
• とことんやさしいイオン交換の本　　　　　　　　　　　　　　　
  岡田 哲男; 早下 隆士
  Jun. 2013

• 2023 - Present
  Advanced Analytical ChemistryⅡ, Graduate School of Science and Engineering(Master's Program)
• 2023 - Present
  Analytical Chemistry II, Saitama University
• 2023 - Present
  Analytical Chemistry I, Saitama University
• 2024 - 2025
  Science and Engineering in Modern Society, Saitama University
• 2024 - 2024
  Topics in Chemistry I, University of Tsukuba

• 分離化学とAI解析の融合による分子認識科学としてのDNAアプタオミクス　　　　　　　　　　　　　　　
  Apr. 2022 - Mar. 2026
  Coinvestigator
  Grant amount(Total)：17290000, Direct funding：13300000, Indirect funding：3990000
  Grant number：22H02104
• 希土類金属選択的に誘発される配位高分子構造変化を利用する希土類金属センシング　　　　　　　　　　　　　　　
  Apr. 2022 - Mar. 2025
  Principal investigator
  Grant amount(Total)：4030000, Direct funding：3100000, Indirect funding：930000
  Grant number：22K05150
• 機能発現・判別を指向するDNAアプタマーの電気泳動選抜　　　　　　　　　　　　　　　
  Apr. 2019 - Mar. 2023
  Coinvestigator
  Grant amount(Total)：17030000, Direct funding：13100000, Indirect funding：3930000
  Grant number：19H02740
• Development of high-performance multi-functional reversed-phase HPLC with the stationary phase containing gas and supercritical fluid　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Apr. 2019 - Mar. 2022
  Shibukawa Masami, Saitama University, Coinvestigator
  Grant amount(Total)：18070000, Direct funding：13900000, Indirect funding：4170000
  This study aims to investigate the function of the gas phase and the supercritical fluid incorporated in porous hydrophobic packing materials in the columns of surface bubble-modulated liquid chromatography and supercritical fluid stationary phase liquid chromatography and develop unprecedented separation technologies. The effects of the structure of the interfacial liquid layer formed on the surface of the hydrophobic packing materials and the chemical structure of the surface of the hydrophobic materials on the separation selectivity were clarified. We also carried out the research with the aim of developing a method for determining volatile organic compounds in an aqueous solution and a high-speed analysis method for inert gases that does not require pretreatment by gas-liquid separation.
  Grant number：19H02741
• Molecular recognition using nano-space in metal-organic frameworks and its structural flexibility　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Apr. 2019 - Mar. 2022
  Tasaki-Handa Yuiko, Saitama University, Principal investigator
  Grant amount(Total)：4420000, Direct funding：3400000, Indirect funding：1020000
  Metal-ion exchange occurring in the metal-organic frameworks (MOFs), formed by the lanthanide ion (Ln3+) and phosphate ester ligands, showed notable ion selectivities that are different from the normal series. The new mechanism of ion-exchange was proposed, where the softness of the MOF framework plays an important role.
  Grant number：19K05537
  受賞ID：41830821
• Development of new separation systems using solvent inside the cages of coordination polymers　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Apr. 2017 - Mar. 2019
  Tasaki-Handa Yuiko, Saitama University, Principal investigator
  Grant amount(Total)：4420000, Direct funding：3400000, Indirect funding：1020000
  We have studied on the following two separation systems using coordination polymers (CPs): i) establishment of a liquid chromatography (LC) where the solvent inside the cages of CP acts as the stationary phase, and ii) ion exchange in CP where water molecules inside the cages of CPs are involved in the reaction. Chromatographic measurement using CP based trimesic acid and Fe3+ (Fe-btc) as the stationary phase revealed that excess solvent molecules adsorbs on the cage of Fe-btc. The solvent inside cage possibly acts as the stationary phase of LC, resulting in the development of a new type of LC system. Ion exchange in a CP based on tetrakisphosphate-La3+-Na+ showed K+ selectivity. Structural analysis indicated that water molecules inside the cage may play an important role.
  The results possibly help the development of new separation systems using CP.
  Grant number：17K17635
• Development and functionalization of hybrid separation systems containing nano-bubbles and nano-supercritical fluid　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Apr. 2016 - Mar. 2019
  Shibukawa Masami, Saitama University, Coinvestigator
  Grant amount(Total)：17940000, Direct funding：13800000, Indirect funding：4140000
  We developed surface-bubble-modulated liquid chromatography (SBMLC), which has a hybrid stationary phase consisting of gas phase as well as the hydrophobic material and the water/hydrophobe interface and showed that this chromatographic method can be performed with the columns packed with various types of hydrophobic porous materials. We determined the distribution coefficients of various organic compounds referring to accumulations onto the water/alkyl chain interface and into the alkyl chain layer from the bulk water by SBMLC. The experimental data provide a picture of the spatial distribution of organic molecules in alkyl bonded silica particles exposed to water. We also developed a liquid chromatography with supercritical fluid stationary phase, which has the hybrid stationary phase consisting of the supercritical carbon dioxide phase, the interfacial liquid phase and the hydrophobic moiety.
  Grant number：16H04161
• Analytical chemistry in nano- and microspace confined by ice　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Apr. 2013 - Mar. 2017
  Okada Tetsuo, Tokyo Institute of Technology, Coinvestigator not use grants
  Grant amount(Total)：47840000, Direct funding：36800000, Indirect funding：11040000
  In this project, we have developed novel methods based on the functionality and have revealed phenomena related to freezing of aqueous solutions; (1) size control of grain boundary channels and application to resolution of particle size; (2) particle counting; (3) chiral separation with frozen proline or leucine; (4) shear-flow ice chromatography; (5) 1000-fold sample enrichment for capillary electrophoresis; (6) enhanced sensitivity of voltammetry; (7) distribution of ions into the ice phase; (8) properties of liquid inclusion formed in frozen electrolyte systems; (9) X-ray fluorescence two- and three-dimensional imaging of frozen NaCl solution containing transition metal ions; (10) hydration of ions in frozen systems: (11) enhanced kinetics by freezing and its dependence on the size of a liquid phase.
  Grant number：25248034
• Characteristic properties of Ion Exchange in a Phosphoester Coordination Polymer　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Apr. 2014 - Mar. 2016
  Tasaki-Handa Yuiko, National Institute of Advanced Industrial Science and Technology, Principal investigator
  Grant amount(Total)：4030000, Direct funding：3100000, Indirect funding：930000
  1) To further investigate the characteristic ion exchange properties in phosphoester coordination polymer, XAFS measurement was conducted. It was found that the local structure of not light lanthanide (Ln3+) but heavy Ln3+ is changed when two kinds of Ln3+ coexist in a coordination polymer. 2) Formation of organogels, following lyophilization of phosphoester coordination polymers enhanced the kinetics of ion exchange reaction. 3) Different phosphoesters had some problems, i.e. high solubility in water and low reactivity, therefore they did not offer beneficial information on the relation between the structure and the ion exchange properties. 4) We found that selective ion exchange reaction occurred also in coordination polymers based on carboxylate.
  Grant number：26810080
• Preparation of Extractant-Predoped Resin and Chromatographic Separation of Rare Earth Elements　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up, Grant-in-Aid for Research Activity Start-up, 2010 - 2011
  TASAKI Yuiko, National Institute of Advanced Industrial Science and Technology, Principal investigator
  Grant amount(Total)：3120000, Direct funding：2400000, Indirect funding：720000
  Composite material of PMMA and coordination polymer of di-(2-ethylhexyl) phosphoric acid(D2EHPA), which is effective for the separation of rare earth elements, was successfully prepared by mixing two components in ethanol/water binary solution. It was revealed that the coordination-polymer composite adsorbs metal ion, and its selectivity of adsorption and desorption depends on pH.
  Grant number：22810027
• アイスクロマトグラフィー / 完全水系分離と氷表面のキャラクタリゼーション　　　　　　　　　　　　　　　
  2007 - 2009
  Principal investigator
  Grant amount(Total)：2700000, Direct funding：2700000
  Grant number：07J10374

• 有機溶媒中のリン酸エステル系抽出剤の除去方法　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許第6573115号
• 配位高分子化を利用するランタノイドイオンの分別沈殿法　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許第6183844号
• 配位高分子化を利用するレアメタルの水系分別沈殿法　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許第6411199号
• 目的金属イオン吸着剤及びその製造方法　　　　　　　　　　　　　　　
  Patent right
• 物質分離材および物質分離方法　　　　　　　　　　　　　　　
  Patent right