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首页> 外文期刊>Physical Review X >Long-Ranged Oppositely Charged Interactions for Designing New Types of Colloidal Clusters
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Long-Ranged Oppositely Charged Interactions for Designing New Types of Colloidal Clusters

机译：长距离相反的相反带电的相互作用，用于设计新型的胶体簇

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Getting control over the valency of colloids is not trivial and has been a long-desired goal for the colloidal domain. Typically, tuning the preferred number of neighbors for colloidal particles requires directional bonding, as in the case of patchy particles, which is difficult to realize experimentally. Here, we demonstrate a general method for creating the colloidal analogs of molecules and other new regular colloidal clusters without using patchiness or complex bonding schemes (e.g., DNA coating) by using a combination of long-ranged attractive and repulsive interactions between oppositely charged particles that also enable regular clusters of particles not all in close contact. We show that, due to the interplay between their attractions and repulsions, oppositely charged particles dispersed in an intermediate dielectric constant ( 4 < ? < 10 ) provide a viable approach for the formation of binary colloidal clusters. Tuning the size ratio and interactions of the particles enables control of the type and shape of the resulting regular colloidal clusters. Finally, we present an example of clusters made up of negatively charged large and positively charged small satellite particles, for which the electrostatic properties and interactions can be changed with an electric field. It appears that for sufficiently strong fields the satellite particles can move over the surface of the host particles and polarize the clusters. For even stronger fields, the satellite particles can be completely pulled off, reversing the net charge on the cluster. With computer simulations, we investigate how charged particles distribute on an oppositely charged sphere to minimize their energy and compare the results with the solutions to the well-known Thomson problem. We also use the simulations to explore the dependence of such clusters on Debye screening length κ ? 1 and the ratio of charges on the particles, showing good agreement with experimental observations.
机译：控制胶体的桂态并不琐碎，并且是胶体域的长期目标。通常，调节胶体颗粒的优选数量的邻居需要定向粘合，如在拼凑的颗粒的情况下，这难以通过实验实现。在这里，我们证明了一种通过使用与相反的带电粒子之间的长距离吸引力和排斥相互作用的组合形成斑块或复合键合方案（例如，DNA涂层）的胶体和其他新常规胶体簇的一般方法。还可以在密切接触中启用常规粒子的簇。我们表明，由于其吸引力和排斥之间的相互作用，分散在中间介电常数（4 <→<10）中的相反带电粒子提供了形成二元胶体簇的可行方法。调整粒子的尺寸比和相互作用使得能够控制所得常规胶体簇的类型和形状。最后，我们提出了由带负电压和带正电荷的小型卫星颗粒组成的簇的示例，其中静电性能和相互作用可以通过电场改变。似乎对于足够强的领域，卫星颗粒可以在主体颗粒的表面上移动并偏振簇。对于甚至更强的田地，卫星颗粒可以完全被拉出，反转簇上的净电荷。通过计算机模拟，我们研究了带电粒子如何在相反的带电的球体上分布，以最大限度地减少它们的能量，并将结果与​​众所周知的汤姆森问题的解决方案进行比较。我们还使用模拟来探索这种群集对德拜德筛查长度κ的依赖性吗？ 1和颗粒上的电荷比率，与实验观察显示良好的一致性。

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