Effects of solvent perturbation on gelation driven by spinodal demixing

被引：11
|
作者：
Bulone, D
Emanuele, A
San Biagio, PL
机构：
[1] CNR, Ist Applicaz Interdisciplinari Fis, I-90146 Palermo, Italy
[2] Univ Palermo, Dept Phys & Astron Sci, INFM, I-90123 Palermo, Italy
来源：
BIOPHYSICAL CHEMISTRY | 1999年 / 77卷 / 01期
关键词：
gelation; spinodal demixing; agarose; phase transition; polymer physics;
D O I：
10.1016/S0301-4622(99)00004-6
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
We study effects of solvent perturbation on kinetic competition between spinodal demixing and gelation in agarose solutions at a concentration of 5 g/l. Two different cosolutes (tert-butyl alcohol and trimethyl amine N-oxide) known for altering in opposite way solvent-mediated interactions are chosen. By rheometry, static and dynamic light scattering experiments, we show that the cosolute presence shifts the boundary of the instability region of solution leaving unaffected temperature and polymer concentration values required for percolation. Results suggest that an appropriate choice of quenching temperature and solvent allows controlling the gelation time and the gel structural properties. (C) 1999 Elsevier Science B.V. All rights reserved.
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页码：1 / 8
页数：8
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