Key Role of Hydrodynamic Interactions in Colloidal Gelation
Key Role of Hydrodynamic Interactions in Colloidal Gelation
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DOI：
10.1103/physrevlett.104.245702
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发表时间：
2010-06-15
影响因子：
8.6
通讯作者：
Tanaka, Hajime
中科院分区：
文献类型：
--
作者：
Furukawa, Akira;Tanaka, Hajime
胶体凝胶化是由悬浮在液体中的胶体颗粒的网状结构的形成引起的。到目前为止，导致凝胶化的主要传输过程被认为是颗粒的布朗扩散。与这种普遍的看法相反，我们通过数值模拟揭示了胶体颗粒之间的多体流体动力学相互作用在凝胶化中也起着至关重要的作用：它们显着促进凝胶化，或降低胶体渗透的体积分数阈值，与它们的存在相比。我们发现，不可压缩的液体成分的性质和由此产生的流体动力学流动的横向（旋转）字符的自组织负责这种网络形成能力的增强。
Colloidal gelation is caused by the formation of a percolated network of colloidal particles suspended in a liquid. Thus far the major transport process leading to gelation has been believed to be the Brownian diffusion of particles. Contrary to this common belief, we reveal by numerical simulations that many-body hydrodynamic interactions between colloidal particles also play an essential role in gelation: They significantly promote gelation, or lower the colloid volume fraction threshold for percolation, as compared to their absence. We find that the incompressible nature of a liquid component and the resulting self-organization of hydrodynamic flow with a transverse (rotational) character are responsible for this enhancement of network-forming ability.