阳离子诱导海藻酸水溶液凝胶化的临界行为与自相似性

以作者对阳离子诱导海藻酸水溶液凝胶化的研究结果为中心,介绍了海藻酸钠水溶液随浓度增大和二价金属阳离子(Ca2 、Cu2 )的加入而发生的溶液-凝胶转变的临界点和相关临界指数,探讨了临界凝胶的自相似性和分形结构,以及动态标度理论对物理交联体系的适用性.基于对阳离子诱导海藻酸水溶液凝胶化及其临界行为的研究结果,提出了从凝胶化的出发点--溶液来对凝胶化进行分类的设想,根据起始组分分子链的长短将凝胶化过程分为生长型和交联型两类.

Critical Exponents and Self-Similarity for Sol-Gel Transition in Aqueous Alginate Systems Induced by Cations

The critical behavior of sol-gel transition in aqueous alginate solution induced by cations was reviewed on the author's results. The gel point and critical exponent were summarized here and the critical phenomena of the gelation were dissussed with the fractal structure of the critical gel and the dynamical scaling theory. The sults suggested two categories of the gelation as growth and crosslink accrording to molecular size in the solution just before the gelation.