Effect of cationic size on gelation temperature and properties of gelatin hydrogels
Effect of cationic size on gelation temperature and properties of gelatin hydrogels
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DOI：
10.1016/j.ijbiomac.2005.01.002
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发表时间：
2005-03-01
影响因子：
8.2
通讯作者：
Bohidar, HB
中科院分区：
文献类型：
--
作者：
Chatterjee, S;Bohidar, HB
用振荡流变学方法研究了Na+、K+和Ca ~（2+）对明胶水凝胶（5%，w/v）的凝胶转变温度（Tg）的影响，P盐浓度范围为1 = 0.01- 0.1M，其显示Tg随盐浓度增加而增加，T-g的趋势显示Ca ~（2+）> K+ > Na+。在溶胶状态（T > Tg）下的动态光散射（DLS）测量显示出两种不同的弛豫模式，而在凝胶状态下，在所有包含显著量的外差贡献的样品中仅观察到凝胶模式。低频（1.5弧度/秒）等时储能模量数据显示，形成强凝胶的存在下，氯化钙相比，NaCl和KCl的情况。从DLS数据获得的慢模弛豫和外差参数表明Ca 2+凝胶中存在较大的团簇。(c)2005 Elsevier B. V.保留所有权利。
Effect of Na+, K+ and Ca2+ on gel transition temperature (T-g) of gelatin hydrogels (5%, w/v) has been studied by oscillatory rheology in the, P salt concentration range 1 = 0.01-0.1 M, which showed increase in Tg with salt concentration with the trend for T-g showing Ca2+ > K+ > Na+. The dynamic light scattering (DLS) measurements in the sol state (T > Tg) showed two distinct relaxation modes whereas only a gel mode was observed in the gel state in all the samples which contained significant amount of heterodyne contribution. Low frequency (1.5 rad/s) isochronal storage modulus data revealed the formation of strong gel in presence of CaCl2 compared to that of NaCl and KCl situations. The slow mode relaxation and heterodyne parameter obtained from DLS data indicate the presence of larger clusters in Ca2+ gels. (c) 2005 Elsevier B.V. All rights reserved.