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

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  • Hideya Kawasaki
    Department of Chemistry, Graduate School of Science, Kyushu University, Fukuoka 812-8581, Japan
  • Yuko Amo
    Research Center for Advanced Science and Technology, University of Tokyo, Tokyo 153-0041, Japan
  • Keiko Motokawa
    Department of Materials Technology, Chiba University, Chiba 263-8522, Japan
  • Hiroshi Maeda
    Department of Chemistry, Graduate School of Science, Kyushu University, Fukuoka 812-8581, Japan
  • Yasunori Tominaga
    Graduate School of Humanities and Science, Ochanomizu University, Tokyo 112-8610, Japan
  • Shigeo Sasaki
    Department of Chemistry, Graduate School of Science, Kyushu University, Fukuoka 812-8581, Japan
  • Takayuki Nakahira
    Department of Materials Technology, Chiba University, Chiba 263-8522, Japan
  • Masahiko Annaka
    Department of Materials Technology, Chiba University, Chiba 263-8522, Japan

Bibliographic Information

Published
2000-10-08
DOI
  • 10.1063/1.1290135
Publisher
AIP Publishing

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<jats:p>The salt effect on the phase transition of N-isopropylacrylamide (NIPA) gel was studied. The swelling behavior of the NIPA gel strongly depends on the salt concentration and is well described as a function of the chemical potential difference of water molecules in solution from that at the transition. From the analysis of the OH stretching, Raman spectra in water and in various aqueous solutions in terms of collective proton motions reveals that the presence of salts tends to disrupt or distort the water molecules in hydrophobic hydration shell around the NIPA gel. This leads to inducing the growth of the cluster shell around the salts, which leads to gel collapse. The volume phase transitions due to the different types of perturbation (temperature, salt) are induced by the same mechanism, hydrophobic hydration and dehydration, and therefore can be described in a unified manner in terms of the chemical potential and the collective proton motions of water molecules.</jats:p>

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