Microrheology of the liquid-solid transition during gelation
Microrheology of the liquid-solid transition during gelation
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DOI：
10.1103/physrevlett.100.146001
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发表时间：
2008-04-11
影响因子：
8.6
通讯作者：
Furst, Eric M.
中科院分区：
文献类型：
--
作者：
Larsen, Travis H.;Furst, Eric M.
采用颗粒跟踪流变学方法，通过液-固转变表征了物理和化学聚合物凝胶的粘弹特性。探针颗粒均方位移的测量值随着凝胶化程度的增加而偏移，以生成主曲线。从位移因子，我们确定凝胶点和临界标度指数。这两个系统都表现出临界松弛指数n接近0.6，其中G'类似于G“类似于初始凝胶的omega（n），与渗流普适类中的动态标度的劳斯模型一致。
The viscoelastic properties of physical and chemical polymer gels are characterized through the liquid-solid transition using particle tracking microrheology. Measurements of the probe particle mean-squared displacement are shifted as the extent of gelation increases to generate master curves. From the shift factors, we determine the gel point and critical scaling exponents. Both systems exhibit a critical relaxation exponent n approximate to 0.6, where G' similar to G '' similar to omega(n) for the incipient gel, consistent with the Rouse model of dynamic scaling in the percolation universality class.