Wetting-induced depletion interaction between particles in a phase-separating liquid mixture.
Wetting-induced depletion interaction between particles in a phase-separating liquid mixture.
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DOI：
10.1103/physreve.73.061506
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发表时间：
2006-06
期刊：
影响因子：
--
通讯作者：
Takeaki Araki;Hajime Tanaka
中科院分区：
文献类型：
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作者：
Takeaki Araki;Hajime Tanaka
夹杂物的固体颗粒显着影响的模式演变的相分离的二元流体混合物，通过优先润湿的一个相的颗粒。在这里，我们研究这个问题的数值模拟，其中包括粒子间的流体动力学相互作用适当。当颗粒倾向于混合物的一种组分时，在颗粒表面上迅速形成润湿层，并且所有颗粒最终被包含在更易润湿的相中。对于不动的颗粒，更多的结晶相的域被钉扎到颗粒上，从而抑制了域的生长。对于这种情况下，在一定的相分离时间的域的大小单调减小的颗粒浓度的增加。对于移动的颗粒，另一方面，观察到的重入形态的转变作为一个函数的颗粒浓度：随着颗粒浓度的增加，更容易形成的相的域形态依次从网络，液滴到网络。我们发现，最后的形态转变是由润湿诱导的耗尽相互作用引起的：当更多的润湿相的总体积不足以覆盖所有的颗粒润湿层时，强吸引力的相互作用在颗粒之间起作用。
Inclusion of solid particles drastically affects the pattern evolution of phase separation of a binary fluid mixture, via preferential wetting of one of the phases to the particles. Here we study this problem by numerical simulation, which incorporates interparticle hydrodynamic interactions properly. When particles favor one of the components of a mixture, wetting layers are quickly formed on the particle surfaces and all particles are eventually included into the more wettable phase. For immobile particles, domains of the more wettable phase are pinned to the particles and the domain growth is thus suppressed. For this case, the domain size at a certain phase-separation time decreases monotonically with increasing the particle concentration. For mobile particles, on the other hand, the reentrant morphological transformation is observed as a function of the particle concentration: With an increase in the particle concentration, the domain morphology of the more wettable phase sequentially changes from network, droplet to network. We found that the final morphological transition is induced by wetting-induced depletion interaction: strong attractive interactions act among particles when the total volume of the more wettable phase is not enough to cover all the particles by wetting layers.