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

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1583-1589
Number of pages7
JournalLangmuir
Volume35
Issue number5
DOIs
Publication statusPublished - Feb 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

Cite this

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.

In: Langmuir, Vol. 35, No. 5, 05.02.2019, p. 1583-1589.

Research output: Contribution to journalArticle

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. In: Langmuir. 2019 ; Vol. 35, No. 5. pp. 1583-1589.
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