​

(55)  J. Shimada, Y. Takaoka, T. Ueda, A. Tani, T. Sugahara,* K. Tsunashima,* H. Yamada, T. Hirai  "Proton Conduction in

        Tetra-n-butylammonium Bromide Semiclathrate Hydrate",

        Solid State Ionics, 393, 116188 (2023).

 

(54)  J. Shimada, M. Shimada, S. Azuma, T. Sugahara,* K. Tsunashima,* T. Hirai  "Peritectic phase behavior of

        tetra-n-butylphosphonium trifluoroacetate semiclathrate hydrate",

        Fluid Phase Equilibria, 567, 113727 (2023).

 

(53)  M. Matsumoto, K. Takeuchi, Y. Inoue, K. Tsunashima, H. Yamada*, "Molecular Insight into the Ionic Conduction of Quaternary

        Ammonium and Phosphonium Cation-Based Ionic Liquids Using Dielectric and Spectroscopy Analyses",

        Journal of Physical Chemistry B, 126, 10490-10499 (2022).

 

(52)  S. Azuma, J. Shimada, K. Tsunashima,* T. Sugahara,* T. Hirai, "Effect of introducing a cyclobutylmethyl group to an

        onium cation on the thermodynamic properties of ionic clathrate hydrate",

        New Journal of Chemistry, 47, 231-237 (2023).

 

(51)  S. Azuma, J. Shimada, K. Tsunashima,* T. Sugahara,* A. Tani, T. Hirai, "Equilibrium Phase Relations and Dissociation

　　Enthalpies of Tri-n-butylalkenylphosphonium Bromide Semiclathrate Hydrates",

        Journal of Chemical & Engneering Data, 67, 1415-1420 (2022).

 

(50)  J. Shimada, M. Yamada, A. Tani, T. Sugahara,* K. Tsunashima,* Y. Tsuchida, T. Hirai, "Thermodynamic Properties of

        Tetra-n-butylphosphonium Dicarboxylate Semiclathrate Hydrates",

        Journal of Chemical & Engneering Data, 67, 67-73 (2022).

 

(49)  J. Shimada, M. Shimada, T. Sugahara,* K. Tsunashima, Y. Takaoka, A. Tani*, "Phase equilibrium temperature and

        dissociation enthalpy in the tri-n-butylalkylphosphonium bromide semiclathrate hydrate systems",

        Chemical Engineering Science, 236, 116514 (2021).

 

(48)  D. Nomizu, Y. Tsuchida, M. Matsumiya,* K. Tsunashima, "Solvation structure and thermodynamics for lanthanide

        complexes in phosphonium-based ionic liquid evaluated by Raman spectroscopy and density functional theory",

        Journal of Molecular Liquids, 318, 114008 (2020).

 

(47)  T. Makino,* K. Tsunashima, M. Kanakubo,  "CO2 Absorption and Physical Properties of Tributyloctylphosphonium

         Benzotriazolate", Fluid Phase Equilibria, 494, 1-7 (2019).

​

(46)  M. Shimada, J. Shimada, T. Sugahara,* K. Tsunashima,*  "Phase Equilibrium Relations for Tetra-n-butylphosphonium

        Acetate Semiclathrate Hydrate Systems in the Presence of Methane, Carbon Dioxide, Nitrogen, or Ethane",

        Fluid Phase Equilibria, 488, 48-53 (2019).

 

(45)  J. Shimada, M. Shimada, T. Sugahara,* K. Tsunashima,*  "Phase equilibrium relations of tetra-n-butylphosphonium

         propionate and butyrate semiclathrate hydrates", Fluid Phase Equilibria, 485, 61-66 (2019).

 

(44)  H. Kanematsu,* A. Oizumi, T. Sato, T. Kamijo, S. Honma, D. M. Barry, N. Hirai, A. Ogawa, T. Kogo, D. Kuroda, K. Sano,
       K. Tsunashima, S- H. Lee, M- H. Lee, "Biofilm Formation of a Polymer Brush Coating with Ionic Liquids Compared to

        a Polymer Brush Coating with a Non-Ionic Liquid", Coatings, 8, 398 (2018).

 

(43)  D. Yamauchi, A. Fukuda, T. Nakai, I. Karahara, M. Takeuchi, D. Tamaoki, T. Tsuda, K. Tsunashima, S. Kuwabata, M. Hoshino,
       K. Uesugi, A. Takeuchi, Y. Suzuki, Y. Mineyuki*, "Use of ionic liquid for X-ray micro-CT specimen preparation of imbibed seeds",

       Microscopy, 68, (1), 92-97 (2019).

​

(42)  Y. Tsuchida, M. Matsumiya,* K. Tsunashima, "The effect of substituents of phosphonium-based ionic liquids evaluated by

        MP2 calculation", Journal of Molecular Liquids, 274, 455-460 (2019).

​

(41)  Y. Tsuchida, M. Matsumiya,* K. Tsunashima, "Preparation of polymer electrolytes using ionic liquids and evaluation of

        physicochemical properties", Journal of Molecular Liquids, 274, 204-208 (2019).

 

(40)  Y. Song, Y. Tsuchida, M. Matsumiya,* K. Tsunashima, "Recovery of ruthenium by solvent extraction and direct electrodeposition

         using ionic liquid solution", Hydrometallurgy, 181, 164-168 (2018).

 

(39)  J. Shimada, M. Shimada, T. Sugahara,* K. Tsunashima,* A. Tani, Y. Tsuchida, M. Matsumiya, "Phase Equilibrium Relations

        of Semiclathrate Hydrates Based on Tetra-n-butylphosphonium Formate, Acetate, and Lactate",

        Journal of Chemical & Engneering Data, 63, 3615-3620 (2018).

 

(38)  Y. Tsuchida, M. Matsumiya,* K. Tsunashima, "Solvation structure for Fe(II), Co(II) and Ni(II) complexes in [P2225][NTf2]

         ionic liquids investigated by Raman spectroscopy and DFT calculation", Journal of Molecular Liquids, 269, 8-13 (2018).

 

(37)  M. Matsumiya,* Y. Song, Y. Tsuchida, H. Ota, K. Tsunashima, "Recovery of platinum by solvent extraction and direct

         electrodeposition using ionic liquid", Separation and Purification Technology, 214, 162-167 (2019).

 

(36)  T. Cosby, Z. Vicars, M. Heres, K. Tsunashima, J. Sangoro*, "Dynamic and structural evidence of mesoscopic aggregation

         in phosphonium ionic liquids", Journal of Chemical Physics, 148, 193815 (2018).  

 

(35)  T. Cosby, Z. Vicars, E. U. Mapesa, K. Tsunashima, J. Sangoro*, "Charge transport and dipolar relaxations in phosphonium-

         based ionic liquids", Journal of Chemical Physics, 147, 234504 (2017).  

 

(34)  M. Matsumiya*, H. Ota, K. Kuribara, K. Tsunashima, "Spectroscopic and Electrochemical Analyses for Neodymium Complexes in

         Potassium Bis(trifluoromethylsulfonyl)amide Melts", Journal of The Electrochemical Society, 164, (8), H5230-H5235 (2017).

 

(33)  M. Matsumiya*, R. Kazuma, K. Tsunashima, "Analysis of thermodynamic properties for rare earth complexes in ionic liquids

         by Raman spectroscopy and DFT calculation", Journal of Applied Solution Chemistry and Modeling, 5, (4), 157-167 (2016).

 

(32)  H. Ota, M. Matsumiya,* N. Sasaya, K. Nishihata, K. Tsunashima, "Investigation of electrodeposition behavior for Nd(III) in

        [P2225][TFSA] ionic liquid by EQCM methods with elevated temperatures", Electrochimica Acta, 222, 20-26 (2016).   

​

(31)  M. Matsumiya,* T. Yamada, S. Murakami, Y. Kohno, K. Tsunashima, "Evaluation for extraction properties and stability of

        extracted rare earth complexes in ionic liquid extraction system using β-diketone",

       Solvent Extraction and Ion Exchange, 34, (5), 454-468 (2016). 

​

(30)  K. Kuribara, M. Matsumiya,* K. Tsunashima, "Solvation structure and thermodynamics for Pr(III), Nd(III) and Dy(III) complexes

        in ionic liquids evaluated by Raman spectroscopy and DFT calculation", Journal of Molecular Structure, 1125, 186-192 (2016).         

​

(29)  N. Sasaya, M. Matsumiya,* S. Murakami, K. Nishihata, K. Tsunashima, "Investigation into applicability of EQCM methods

        at elevated temperature for ionic liquids", Electrochimica Acta, 194, 304-309 (2016).         

​

(28)  S. Murakami, M. Matsumiya,* T. Yamada, K. Tsunashima, "Extraction of Pr(III), Nd(III) and Dy(III) from HTFSA aqueous solution

        by TODGA/phosphonium-based ionic liquids", Solvent Extraction and Ion Exchange, 34, (2), 172-187 (2016).      

​

(27)  M. Matsumiya,* R. Kazuma, K. Tsunashima, "Analysis of coordination states for Dy(II) and Dy(III) complexes in ionic liquids

        by Raman spectroscopy and DFT calculation", Journal of Molecular Liquids, 215, 308-315 (2016).           

​

(26)  P. J. Griffin,* A. P. Holt, K. Tsunashima, J. R. Sangoro, F. Kremer, A. P. Sokolov, "Ion transport and local structural dynamics

        in homologous quaternary ammonium and phosphonium-based room temperature ionic liquids",

        Journal of Chemical Physics, 142, 084501 (2015).           

​

(25)  Y. Asahi, J. Miura, T. Tsuda,* S. Kuwabata, K. Tsunashima, Y. Noiri, T. Sakata, S. Ebisu, M. Hayashi,

        "Simple observation of Streptococcus mutans biofilm by scanning electron microscopy using ionic liquids", AMB Express, 5, 6 (2015).   

​

(24)  M. Matsumiya,* K. Hata, K. Tsunashima, "Self-diffusion behaviors of ionic liquids by MD simulation based on united-atom

        force field introduced charge scaling by ab initio MO simulation", Journal of Molecular Liquids, 203, 125-130 (2015). 

​

(23)  N. Sasaya, M. Matsumiya,* K. Tsunashima, "Solvation and electrochemical analyses of neodymium complexes in TFSA-based

        ionic liquids dissolving the nitrates synthesized from spent Nd-Fe-B magnets", Polyhedron, 85, 888-893 (2015).             

​

(22)  K. Matsumoto,* U. Harinaga, R. Tanaka, A. Koyama, R. Hagiwara, K. Tsunashima, "Structural classification of the highly disordered

        crystal phases of [Nn][BF4], [Nn][PF6], [Pn][BF4], and [Pn][PF6] salts (Nn+ = tetraalkylammonium and Pn+ = tetraalkylphosphonium)",

       Physical Chemistry Chemical Physics, 16, (43), 23616-23626 (2014).     

​

(21)  T. Tsuda,* E. Mochizuki, S. Kishida, K. Iwasaki, K. Tsunashima, S. Kuwabata, "SEM Observation of Hydrous Superabsorbent

        Polymer Pretreated with Room-Temperature Ionic Liquids", PLoS ONE, 9, (3), e91193 (2014).            

​

(20)  K. Tsunashima,* Y. Sakai, M. Matsumiya, "Physical and electrochemical properties of phosphonium ionic liquids derived from

        trimethylphosphine", Electrochemistry Communications, 39, 30-33 (2014).  

​

(19)  K. Tsunashima,* T. Matsubayashi, Y. Ono, M. Matsumiya, "Electropolymerization of Pyrrole in a Bis(fluorosulfonyl)amide-Based

        Ionic Liquid", ECS Electrochemistry Letters, 3, (1), G1-G4 (2014).   

​

(18)  K. Yoshii, K. Yamaji, T. Tsuda,* K. Tsunashima, H. Yoshida, M. Ozaki, S. Kuwabata, "Physicochemical Properties of

        Tri-n-butylalkylphosphonium Cation-Based Room-Temperature Ionic Liquids",

        Journal of Physical Chemistry B, 117, (48), 15051-15059 (2013).     

​

(17)  R. Kazama, M. Matsumiya,* N. Tsuda, K. Tsunashima, "Electrochemical analysis of diffusion behavior and nucleation mechanism

        for Dy(II) and Dy(III) in phosphonium-based ionic liquids", Electrochimica Acta, 113, 269-279 (2013).         

​

(16)  M. Matsumiya,* Y. Kamo, K. Hata, K. Tsunashima, "Solvation structure of iron group metal ion in TFSA-based ionic liquids

        investigated by Raman spectroscopy and DFT calculations", Journal of Molecular Structure, 1048, 59-63 (2013).

​

(15)  M. Kelland,* F. Gausland, K. Tsunashima, "Inhibition of tetrahydrofuran hydrate crystal growth by tetraalkylphosphonium salts

        - superior performance to equivalent tetraalkylammonium salts", Chemical Engineering Science, 98, (1), 12-16 (2013). 

​

(14)  綱島克彦,* 宮﨑輝実, 前川奈穂, "梅調味廃液を用いたネオジムおよびサマリウムの分離回収",

        Journal of Technology and Education (電気化学会技術･教育研究論文誌), 20, (1), 1-5 (2013).        

​

(13)  K. Tsunashima,* M. Fukushima, M. Matsumiya, "Physicochemical Properties of Trialkylphosphonium-Based Protic Ionic Liquids",

        Electrochemistry, 80, (11), 904-906 (2012).        

​

(12)  A. Kurachi,* M. Matsumiya, K. Tsunashima, S. Kodama, "Electrochemical behavior and electrodeposition of dysprosium in

        ionic liquids based on phosphonium cations", Journal of Applied Electrochemistry, 42, (11), 961-968 (2012).      

​

(11)  H. Kondo,* M. Matsumiya, K. Tsunashima, S. Kodama, "Attempts to the electrodeposition of Nd from ionic liquids at elevated

        temperatures", Electrochimica Acta, 66, (1), 313-319 (2012).

    

(10)  M. Matsumiya,* K. Tsunashima, S. Kodama, "Electrochemical behavior of hydrogen in low-viscosity phosphonium ionic liquids",

        Zeitschrift für Naturforschung A, 66a, (10-11), 668-674 (2011).            

  

(9)  松宮正彦,* 近藤 瞳, 倉知明史, 綱島克彦, 小玉 春, "イオン液体電析法による鉄族金属の分離およびネオジム金属の回収",

      日本金属学会誌, 75, (11), 607-612 (2011).

​

(8)  Y. Kunugi,* N. Hamada, S. Kodama, M. Sugiya, K. Tsunashima, "Methoxymethyl-Substituted Quaternary Phosphonium Ionic Liquids

      as Electrolytes for Dye-Sensitized Solar Cells", Electrochemistry, 79, (10), 810-812 (2011).         

​

(7)  T. Enomoto, S. Kanematsu, K. Tsunashima, K. Matsumoto,* R. Hagiwara, "Physicochemical properties and plastic crystal structures

      of phosphonium fluorohydrogenate salts", Physical Chemistry Chemical Physics, 13, (27), 12536-12544 (2011).      

​

(6)  K. Tsunashima,* F. Yonekawa, M. Kikuchi, M. Sugiya, "Effect of Quaternary Phosphonium Salts in Organic Electrolyte for

      Lithium Secondary Batteries", Electrochemistry, 79, (6), 453-457 (2011).             

​

(5)  K. Tsunashima,* Y. Ono, M. Sugiya, "Physical and electrochemical characterization of ionic liquids based on quaternary phosphonium

      cations containing a carbon-carbon double bond", Electrochimica Acta, 56, (11), 4351-4355 (2011).            

​

(4)  K. Tsunashima,* A. Kawabata,　M. Matsumiya, S. Kodama, R. Enomoto, M. Sugiya, Y. Kunugi, "Low viscous and highly conductive

      phosphonium ionic liquids based on bis(fluorosulfonyl)amide anion as potential electrolytes",

     Electrochemistry Communications, 13, (2), 178-181 (2011). 

​

(3)  K. Tsunashima,* S. Kodama, M. Sugiya, Y. Kunugi, "Physical and electrochemical properties of room-temperature dicyanamide ionic liquids

      based on quaternary phosphonium cations", Electrochimica Acta, 56, (2), 762-766 (2010). 

 

(2)  K. Tsunashima,* F. Yonekawa, M. Kikuchi, M. Sugiya, "Tributylmethylphosphonium Bis(trifluoromethylsulfonyl)amide as an Effective

      Electrolyte Additive for Lithium Secondary Batteries", Journal of the Electrochemical Society, 157, (11), A1274-A1278 (2010).           

​

(1)  K. Tsunashima,* E. Niwa, S. Kodama, M. Sugiya, Y. Ono, "Thermal and Transport Properties of Ionic Liquids Based on Benzyl-Substituted

      Phosphonium Cations", Journal of Physical Chemistry B, 113, (48), 15870-15874 (2009).