Ion-Specific Hydration States of Zwitterionic Poly(sulfobetaine methacrylate) Brushes in Aqueous Solutions

Tatsunori Sakamaki, Yoshihiro Inutsuka, Kosuke Igata, Keiko Higaki, Norifumi L. Yamada, Yuji Higaki, Atsushi Takahara

研究成果: ジャーナルへの寄稿記事

2 引用 (Scopus)

抄録

The ion-specific hydration states of zwitterionic poly(3-(N-2-methacryloyloxyethyl-N,N-dimethyl)ammonatopropanesulfonate) (PMAPS) brushes in various aqueous solutions were investigated by neutron reflectivity (NR) and atomic force microscopy (AFM). The asymmetric hydration state of the PMAPS brushes was verified from the NR scattering-length density profiles, while the variation in their swollen thickness was complementary as determined from AFM topographic images. PMAPS brushes got thicker in any salt solutions, while the extent of swelling and the dimensions of swollen chain structure were dependent on the ion species and salt concentration in the solutions. Anion specificity was clearly observed, whereas cations exhibited weaker modulation in ion-specific hydration states. The anion specificity could be ascribed to ion-specific interactions between the quaternary ammonium cation in sulfobetaine and the anions. The weak cation specificity was attributed to the intrinsically weak cohesive interactions between the weakly hydrated sulfonate anion in sulfobetaine and the strongly hydrated cations. The ion-specific hydration of PMAPS brushes was largely consistent with the ion-specific aggregation state of the PMAPS chains in aqueous solutions.

元の言語英語
ページ(範囲)1583-1589
ページ数7
ジャーナルLangmuir
35
発行部数5
DOI
出版物ステータス出版済み - 2 5 2019

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brushes
Brushes
Hydration
hydration
Ions
aqueous solutions
Anions
Cations
Negative ions
Positive ions
anions
cations
ions
Atomic force microscopy
Neutrons
Salts
atomic force microscopy
salts
reflectance
neutrons

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

これを引用

Ion-Specific Hydration States of Zwitterionic Poly(sulfobetaine methacrylate) Brushes in Aqueous Solutions. / Sakamaki, Tatsunori; Inutsuka, Yoshihiro; Igata, Kosuke; Higaki, Keiko; Yamada, Norifumi L.; Higaki, Yuji; Takahara, Atsushi.

:: Langmuir, 巻 35, 番号 5, 05.02.2019, p. 1583-1589.

研究成果: ジャーナルへの寄稿記事

Sakamaki, T, Inutsuka, Y, Igata, K, Higaki, K, Yamada, NL, Higaki, Y & Takahara, A 2019, 'Ion-Specific Hydration States of Zwitterionic Poly(sulfobetaine methacrylate) Brushes in Aqueous Solutions', Langmuir, 巻. 35, 番号 5, pp. 1583-1589. https://doi.org/10.1021/acs.langmuir.8b03104
Sakamaki, Tatsunori ; Inutsuka, Yoshihiro ; Igata, Kosuke ; Higaki, Keiko ; Yamada, Norifumi L. ; Higaki, Yuji ; Takahara, Atsushi. / Ion-Specific Hydration States of Zwitterionic Poly(sulfobetaine methacrylate) Brushes in Aqueous Solutions. :: Langmuir. 2019 ; 巻 35, 番号 5. pp. 1583-1589.
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abstract = "The ion-specific hydration states of zwitterionic poly(3-(N-2-methacryloyloxyethyl-N,N-dimethyl)ammonatopropanesulfonate) (PMAPS) brushes in various aqueous solutions were investigated by neutron reflectivity (NR) and atomic force microscopy (AFM). The asymmetric hydration state of the PMAPS brushes was verified from the NR scattering-length density profiles, while the variation in their swollen thickness was complementary as determined from AFM topographic images. PMAPS brushes got thicker in any salt solutions, while the extent of swelling and the dimensions of swollen chain structure were dependent on the ion species and salt concentration in the solutions. Anion specificity was clearly observed, whereas cations exhibited weaker modulation in ion-specific hydration states. The anion specificity could be ascribed to ion-specific interactions between the quaternary ammonium cation in sulfobetaine and the anions. The weak cation specificity was attributed to the intrinsically weak cohesive interactions between the weakly hydrated sulfonate anion in sulfobetaine and the strongly hydrated cations. The ion-specific hydration of PMAPS brushes was largely consistent with the ion-specific aggregation state of the PMAPS chains in aqueous solutions.",
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