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arXiv 1409.0903cond-mat.soft
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软排斥如何增强耗尽机制

How soft repulsion enhances the depletion mechanism

Lorenzo Rovigatti, Nicoletta Gnan, Alberto Parola, Emanuela Zaccarelli

摘要:

我们调查二元混合物的大胶体相互作用,通过软势与小,理想的耗尽。我们表明,柔软度产生的胶体-胶体有效电位有显着的效果时,耗尽剂-胶体的尺寸比$q$是小的,具有显着的后果上的胶体相行为。我们还提供了一个确切的关系,使我们能够获得有效的对潜在的{ \it任何}类型的胶体-depletant相互作用的情况下,理想的depletants,而不必依赖于复杂和昂贵的全混合物模拟。我们还表明,软之间的排斥expletants进一步增强胶体聚集的趋势。我们的理论和数值计算结果表明,-在小$q$ -软混合物的限制,不能映射到硬系统,因此软耗尽是不是一个简单的扩展广泛使用的Asakura-Oosawa潜力。

英文摘要:

We investigate binary mixtures of large colloids interacting through soft potentials with small, ideal depletants. We show that softness has a dramatic effect on the resulting colloid-colloid effective potential when the depletant-to-colloid size ratio $q$ is small, with significant consequences on the colloidal phase behaviour. We also provide an exact relation that allows us to obtain the effective pair potential for {\it any} type of colloid-depletant interactions in the case of ideal depletants, without having to rely on complicated and expensive full-mixture simulations. We also show that soft repulsion among depletants further enhances the tendency of colloids to aggregate. Our theoretical and numerical results demonstrate that --- in the limit of small $q$ --- soft mixtures cannot be mapped onto hard systems and hence soft depletion is not a mere extension of the widely used Asakura-Oosawa potential.

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