Salt-induced volume phase transition of poly(N-isopropylacrylamide) gel

Masahiko Annaka, Keiko Motokawa, Shigeo Sasaki, Takayuki Nakahira, Hideya Kawasaki, Hiroshi Maeda, Yuko Amo, Yasunori Tominaga

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)


The phase transition of N-isopropylacrylamide (NIPA) gel was studied in terms of the salt concentration, and was described as a function of the chemical potential difference of water molecules in solution at the transition. The Raman spectra in water and in various aqueous solutions, reveals that the presence of salts tends to disrupt the water molecules in hydrophobic hydration shell around the NIPA gel. The volume phase transitions, due to the different types of perturbations, can be described in terms of the chemical potential and the collective proton motions of water molecules.

Original languageEnglish
Pages (from-to)5980-5985
Number of pages6
JournalJournal of Chemical Physics
Issue number14
Publication statusPublished - Oct 8 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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