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arXiv 0805.0652cond-mat.soft
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胶体分散体玻璃化转变的热力学应力理论

Theory of Thermodynamic Stresses in Colloidal Dispersions at the Glass Transition

D. Hajnal, O. Henrich, J. J. Crassous, M. Siebenbuerger, M. Drechsler, M. Ballauff, M. Fuchs

摘要:

讨论了稠密胶体分散体系在玻璃化转变时的非线性流变学。第一原理方法开始与相互作用的布朗粒子在给定的任意均匀(不可压缩)流忽略水动力相互作用的草图。例如,它解释了在由聚苯乙烯核和交联的聚(N-异丙基丙烯酰胺)(PNIPAM)壳组成的热敏核-壳颗粒的稠密悬浮液中测量的有限剪切速率的稳态流动曲线。简单和广义Herschel-Bulkley定律的指数计算硬球。

英文摘要:

We discuss the nonlinear rheology of dense colloidal dispersions at the glass transition. A first principles approach starting with interacting Brownian particles in given arbitrary homogeneous (incompressible) flow neglecting hydrodynamic interactions is sketched. It e.g. explains steady state flow curves for finite shear rates measured in dense suspensions of thermosensitive core-shell particles consisting of a polystyrene core and a crosslinked poly(N-isopropylacrylamide)(PNIPAM) shell. The exponents of simple and generalized Herschel Bulkley laws are computed for hard spheres.

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