Yuriko Kakihana
Kobe University
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Featured researches published by Yuriko Kakihana.
Membranes | 2013
Atsushi Jikihara; Reina Ohashi; Yuriko Kakihana; Mitsuru Higa; Kenichi Kobayashi
Random-type anion-exchange membranes (AEMs) have been prepared by blending poly(vinyl alcohol) (PVA) and the random copolymer-type polycation, poly(vinyl alcohol-co-methacryloyl aminopropyl trimethyl ammonium chloride) at various molar percentages of anion-exchange groups to vinyl alcohol groups, Cpc, and by cross-linking the PVA chains with glutaraldehyde (GA) solution at various GA concentrations, CGA. The characteristics of the random-type AEMs were compared with blend-type AEMs prepared in our previous study. At equal molar percentages of the anion exchange groups, the water content of the random-type AEMs was lower than that of the blend-type AEMs. The effective charge density of the random-type AEMs increased with increasing Cpc and reached a maximum value. Further, the maximum value of the effective charge density increased with increasing CGA. The maximum value of the effective charge density, 0.42 mol/dm3, was obtained for the random-type AEM with Cpc = 4.2 mol % and CGA = 0.15 vol %. A comparison of the random-type and blend-type AEMs with almost the same Cpc showed that the random-type AEMs had lower membrane resistance than the blend-type ones. The membrane resistance and dynamic transport number of the random-type AEM with Cpc = 6.0 mol % and CGA = 0.15 vol % were 4.8 Ω cm2 and 0.83, respectively.
Materials Science and Engineering: C | 2017
Zhuang Zhou; Saeid Rajabzadeh; Li-Feng Fang; Taro Miyoshi; Yuriko Kakihana; Hideto Matsuyama
Braid-reinforced hollow fiber membranes with high mechanical properties and considerable antifouling surface were prepared by blending poly(vinyl chloride) (PVC) with poly(vinyl chloride-co-poly(ethylene glycol) methyl ether methacrylate) (poly(VC-co-PEGMA)) copolymer via non-solvent induced phase separation (NIPS). The tensile strength of the braid-reinforced PVC hollow fiber membranes were significantly larger than those of previously reported various types of PVC hollow fiber membranes. The high interfacial bonding strength indicated the good compatibility between the coating materials and the surface of polyethylene terephthalate (PET)-braid. Owing to the surface segregation phenomena, the membrane surface PEGMA coverage increased upon increasing the poly(VC-co-PEGMA)/PVC blending ratio, resulting in higher hydrophilicities and bovine serum albumin (BSA) repulsion. To compare the fouling properties, membranes with similar PWPs were prepared by adjusting the dope solution composition to eliminate the effect of hydrodynamic conditions on the membrane fouling performance. The blend membranes surface exhibited considerable fouling resistance to the molecular adsorption from both BSA solution and activated sludge solution. In both cases, the flux recovered to almost 80% of the initial flux using only water backflush. Considering their great mechanical properties and antifouling resistance to activated sludge solution, these novel membranes show good potential for application in wastewater treatment.
Langmuir | 2018
Fumiyasu Seino; Yuichi Konosu; Minoru Ashizawa; Yuriko Kakihana; Mitsuru Higa; Hidetoshi Matsumoto
Poly(vinyl alcohol) (PVA)-based ion-exchange nanofibers (IEX-NFs) and their composite polyelectrolyte membranes were prepared and characterized. The PVA-based NFs are well dispersed and form a three-dimensional network structure in the polymer matrix, Nafion. All of the prepared membranes show a similar ion-exchange capacity of ∼1.0 mmol g-1. The ionic conductivities through the PVA- b-PSS-NF/Nafion composite membranes are superior to that of the Nafion membranes, but the conductivity through the PVA-NF/Nafion composite membrane is half that of the Nafion membrane. Our electrokinetic measurements clearly indicate that a high density of ion-exchange groups on the NF surface results in a continuous ionic transport path in the polymer matrix. In addition, the mechanical strength of all of the NF-composite membranes is improved compared with that of the membranes without NF.
Journal of Membrane Science | 2017
Li Feng Fang; Sungil Jeon; Yuriko Kakihana; Jun ichi Kakehi; Bao-Ku Zhu; Hideto Matsuyama; Shuaifei Zhao
Applied Surface Science | 2015
Saeid Rajabzadeh; Rie Sano; Toru Ishigami; Yuriko Kakihana; Yoshikage Ohmukai; Hideto Matsuyama
Electrochimica Acta | 2015
Mitsuru Higa; Shiyan Feng; Nobutaka Endo; Yuriko Kakihana
Journal of Membrane Science | 2016
Zhuang Zhou; Saeid Rajabzadeh; Abdul Rajjak Shaikh; Yuriko Kakihana; Toru Ishigami; Rie Sano; Hideto Matsuyama
Journal of Membrane Science | 2013
Mitsuru Higa; Mayumi Kobayashi; Yuriko Kakihana; Atsushi Jikihara; Naoki Fujiwara
Journal of Applied Polymer Science | 2016
Yuchen Sun; Saeid Rajabzadeh; Wenzhong Ma; Zhuang Zhou; Yuriko Kakihana; Yoshikage Ohmukai; Jun Miki; Hideto Matsuyama
Polymer | 2014
Mitsuru Higa; Nobuyuki Tanaka; Minami Nagase; Kazuhiro Yutani; Tomokazu Kameyama; Keita Takamura; Yuriko Kakihana