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

被引:91
作者
Annaka, M [1 ]
Motokawa, K
Sasaki, S
Nakahira, T
Kawasaki, H
Maeda, H
Amo, Y
Tominaga, Y
机构
[1] Chiba Univ, Dept Mat Technol, Chiba 2638522, Japan
[2] Kyushu Univ, Grad Sch Sci, Dept Chem, Fukuoka 8128581, Japan
[3] Univ Tokyo, Adv Sci & Technol Res Ctr, Tokyo 1530041, Japan
[4] Ochanomizu Univ, Grad Sch Humanities & Sci, Tokyo 1128610, Japan
关键词
D O I
10.1063/1.1290135
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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. (C) 2000 American Institute of Physics. [S0021-9606(00)52037-6].
引用
收藏
页码:5980 / 5985
页数:6
相关论文
共 19 条
[1]  
ERGIN YV, 1983, MAGNITNYE SVOISTVA I
[2]   SPECTROSCOPIC EVIDENCE FOR SPATIAL CORRELATIONS OF HYDROGEN-BONDS IN LIQUID WATER [J].
GREEN, JL ;
LACEY, AR ;
SCEATS, MG .
JOURNAL OF PHYSICAL CHEMISTRY, 1986, 90 (17) :3958-3964
[3]   COUPLING OF SMALL-AMPLITUDE PROTON MOTIONS IN LIQUID WATER TO DENSITY AND TEMPERATURE [J].
GREEN, JL ;
LACEY, AR ;
SCEATS, MG ;
HENDERSON, SJ ;
SPEEDY, RJ .
JOURNAL OF PHYSICAL CHEMISTRY, 1987, 91 (06) :1684-1686
[4]   DETERMINATION OF THE INTRINSIC NETWORK DEFECT DENSITY IN LIQUID WATER [J].
GREEN, JL ;
LACEY, AR ;
SCEATS, MG .
CHEMICAL PHYSICS LETTERS, 1986, 130 (1-2) :67-71
[5]   Differences in hydration structure near hydrophobic and hydrophilic amino acids [J].
HeadGordon, T ;
Sorenson, JM ;
Pertsemlidis, A ;
Glaeser, RM .
BIOPHYSICAL JOURNAL, 1997, 73 (04) :2106-2115
[6]   VOLUME PHASE-TRANSITION IN A NONIONIC GEL [J].
HIROKAWA, Y ;
TANAKA, T .
JOURNAL OF CHEMICAL PHYSICS, 1984, 81 (12) :6379-6380
[7]   VOLUME-PHASE TRANSITIONS OF IONIZED N-ISOPROPYLACRYLAMIDE GELS [J].
HIROTSU, S ;
HIROKAWA, Y ;
TANAKA, T .
JOURNAL OF CHEMICAL PHYSICS, 1987, 87 (02) :1392-1395
[9]   EFFECT OF ADDITIVES ON PHASE-TRANSITION OF N-ISOPROPYLACRYLAMIDE GELS [J].
INOMATA, H ;
GOTO, S ;
OTAKE, K ;
SAITO, S .
LANGMUIR, 1992, 8 (02) :687-690
[10]  
KAMINSKY M, 1957, DISCUSS FARADAY SOC, P171