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

DOI PDF 被引用文献11件
  • Masahiko Annaka
    Department of Materials Technology, Chiba University, Chiba 263-8522, Japan
  • Keiko Motokawa
    Department of Materials Technology, Chiba University, Chiba 263-8522, 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
  • Hideya Kawasaki
    Department of Chemistry, Graduate School of Science, Kyushu University, Fukuoka 812-8581, Japan
  • Hiroshi Maeda
    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
  • Yasunori Tominaga
    Graduate School of Humanities and Science, Ochanomizu University, Tokyo 112-8610, Japan

書誌事項

公開日
2000-10-08
DOI
  • 10.1063/1.1290135
公開者
AIP Publishing

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説明

<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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