Effect of Charged Group Spacer Length on Hydration State in Zwitterionic Poly(sulfobetaine) Brushes

Yuji Higaki, Yoshihiro Inutsuka, Tatsunori Sakamaki, Yuki Terayama, Ai Takenaka, Keiko Higaki, Norifumi L. Yamada, Taro Moriwaki, Yuka Ikemoto, Atsushi Takahara

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Effect of alkyl chain spacer length between the charged groups (CSL) in zwitterionic poly(sulfobetaine) (PSB) brushes on the hydration state was investigated. PSB brushes with ethyl (PMAES), propyl (PMAPS), or butyl (PMABS) CSL were prepared by surface-initiated atom transfer radical polymerization on silicon wafers. Hydration states of the PSB brushes in aqueous solutions and/or humid vapor were investigated by contact angle measurement, infrared spectroscopy, AFM observation, and neutron reflectivity. The PSB brushes are swollen in humid air and deionized water due to the hydration of the charged groups leading to the reduction of hydrated PSB brushes/water interfacial free energy. The hydrated PSB brushes exhibit clear interface with low interfacial roughness due to networking of the PSB brush chains through association of the SBs. The hydrated PSB brushes produce diffusive swollen layer in the presence of NaCl because of the charge screening followed by SB dissociation by the bound ions. The ionic strength sensitivity in the hydration got more significant with increasing the CSL in SBs because of the augmentation in partial charge by charged group separation.

Original languageEnglish
Pages (from-to)8404-8412
Number of pages9
JournalLangmuir
Volume33
Issue number34
DOIs
Publication statusPublished - Aug 29 2017

Fingerprint

brushes
Brushes
Hydration
spacers
hydration
sulfobetaine
Deionized water
Atom transfer radical polymerization
Angle measurement
Ionic strength
Silicon wafers
water
Free energy
Contact angle
Infrared spectroscopy
Screening
Neutrons
roughness
screening
polymerization

All Science Journal Classification (ASJC) codes

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

Cite this

Effect of Charged Group Spacer Length on Hydration State in Zwitterionic Poly(sulfobetaine) Brushes. / Higaki, Yuji; Inutsuka, Yoshihiro; Sakamaki, Tatsunori; Terayama, Yuki; Takenaka, Ai; Higaki, Keiko; Yamada, Norifumi L.; Moriwaki, Taro; Ikemoto, Yuka; Takahara, Atsushi.

In: Langmuir, Vol. 33, No. 34, 29.08.2017, p. 8404-8412.

Research output: Contribution to journalArticle

Higaki, Y, Inutsuka, Y, Sakamaki, T, Terayama, Y, Takenaka, A, Higaki, K, Yamada, NL, Moriwaki, T, Ikemoto, Y & Takahara, A 2017, 'Effect of Charged Group Spacer Length on Hydration State in Zwitterionic Poly(sulfobetaine) Brushes', Langmuir, vol. 33, no. 34, pp. 8404-8412. https://doi.org/10.1021/acs.langmuir.7b01935
Higaki Y, Inutsuka Y, Sakamaki T, Terayama Y, Takenaka A, Higaki K et al. Effect of Charged Group Spacer Length on Hydration State in Zwitterionic Poly(sulfobetaine) Brushes. Langmuir. 2017 Aug 29;33(34):8404-8412. https://doi.org/10.1021/acs.langmuir.7b01935
Higaki, Yuji ; Inutsuka, Yoshihiro ; Sakamaki, Tatsunori ; Terayama, Yuki ; Takenaka, Ai ; Higaki, Keiko ; Yamada, Norifumi L. ; Moriwaki, Taro ; Ikemoto, Yuka ; Takahara, Atsushi. / Effect of Charged Group Spacer Length on Hydration State in Zwitterionic Poly(sulfobetaine) Brushes. In: Langmuir. 2017 ; Vol. 33, No. 34. pp. 8404-8412.
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