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arXiv 1201.0773cond-mat.softcond-mat.mes-hallcond-mat.mtrl-scicond-mat.stat-mech
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利用三元自组装单分子膜设计片状粒子

Design of Patchy Particles using Ternary Self-Assembled Monolayers

Ines C. Pons-Siepermann, Sharon C. Glotzer

摘要:

最近的模拟已经研究了在吸收到球形纳米颗粒表面上的不混溶表面活性剂的二元混合物中图案的形成。得到的图案(Janus,斑点和条纹)与实验结果吻合得很好。我们进行耗散粒子动力学(DPD)模拟,研究通过添加第三表面活性剂的单层作为一个指南,对增加这种方式合成的片状颗粒的丰富性和多样性所获得的图案。我们预测了各种新的模式,可以通过简单的设计元素,如纳米胶体的大小,表面活性剂的不可吸收性,单层的化学计量,表面活性剂之间的长度差异不同的组合产生。在所有情况下,通过构象熵最大化的自由能最小化决定平衡斑图形成。

英文摘要:

Recent simulations have studied the formation of patterns in a binary mixture of immiscible surfactants absorbed onto the surface of a spherical nanoparticle. The resulting patterns (Janus, spots and stripes) were in good agreement with experimental results. We perform dissipative particle dynamics (DPD) simulations to study the patterns obtained by adding a third surfactant to the monolayer as a guide towards increasing the richness and diversity of patchy particles synthesized this way. We predict a variety of new patterns that can be produced through different combinations of simple design elements, like nanocolloid size, degree of surfactant immiscibility, stoichiometry of the monolayer, and length difference between surfactants. In all cases, free energy minimization through conformational entropy maximization determines equilibrium pattern formation.

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