Solvent transportation behavior of mechanically constrained agarose gels
Solvent transportation behavior of mechanically constrained agarose gels
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DOI：
10.1007/s00397-015-0842-2
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发表时间：
2015-05-01
期刊：
影响因子：
2.3
通讯作者：
Iwasaki, Sayuri
中科院分区：
文献类型：
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作者：
Kaneda, Isamu;Iwasaki, Sayuri
研究了在不同温度下淬灭的压缩琼脂糖凝胶中溶剂的传输模式。压缩载荷和琼脂糖凝胶的体积在压缩约束期间随时间而减小。体积的减少是通过压缩约束从凝胶中挤出溶剂而引起的。压缩载荷的松弛和凝胶体积的减小可以使用拉伸指数函数来分析;此外，有趣的是，这两个时间常数是耦合的。提出了溶剂迁移（挤出）引起压缩载荷的松弛。在略低于溶胶-凝胶共存温度（T（凝胶））下制备的水凝胶表现出独特的行为，其特征在于溶剂传输速率的增加。据推测，微相分离发生在样品淬火接近T（凝胶）由于旋节分解，从而形成相对较大的溶剂路径的凝胶。湍流测量和小角光散射数据支持这一假设。
The mode of transport of solvent from compressed agarose gels that were quenched at various temperatures was investigated. The compression load and the volume of the agarose gels decreased with time during compressive restraint. The decrease in volume was induced by squeezing of the solvent from the gel by compressive restraint. Relaxation of the compression load and the decrease in volume of the gels could be analyzed using a stretched exponential function; moreover, interestingly, both time constants were coupled. It is proposed that relaxation of the compression load was induced by solvent transportation (squeezing out). The hydrogel prepared at just below the sol-gel coexisting temperature (T (gel)) exhibited distinguishing behavior, characterized by an increase in the rate of the solvent transportation. It is postulated that micro-phase separation occurred in the sample quenched close to T (gel) due to spinodal decomposition, with consequent formation of relatively large solvent paths in the gel. Turbidity measurements and small angle light scattering data supported this postulate.