Mix-and-Melt Colloidal Engineering
Mix-and-Melt Colloidal Engineering
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DOI：
10.1021/acsnano.8b00521
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发表时间：
2018-04-01
期刊：
影响因子：
17.1
通讯作者：
Sacanna, Stefano
中科院分区：
文献类型：
--
作者：
Hueckel, Theodore;Sacanna, Stefano
智能胶体颗粒的合成越来越重要，因为各种超材料的路线已经通过自下而上的自组装概述。不幸的是，制造具有明确形状和表面化学的颗粒通常需要相当大的努力和时间，因此，它们只能以有限的产量获得。在这里，我们报告的合成方法，我们称之为混合和熔融反应（MMR），允许快速原型和大规模生产的各向异性核壳胶体。MMR利用普通胶体悬浮液之间的协同特性，通过聚集然后将聚苯乙烯壳颗粒重新配置到核颗粒基底上。通过系统地交换核和壳，以模块化方式操纵所得核壳颗粒的性质。成分颗粒的尺寸比的影响进行了广泛的探讨，这是示出调整壳的厚度，改变各向异性核壳的纵横比，并访问特定的形状，如四面体。除了粒子形状，混合壳系统用于创建规则的曲面片。Surface Evolver模拟用于演示如何通过壳分隔机制将随机堆积的簇熔化成规则形状。
Increasing significance is being placed on the synthesis of smart colloidal particles, since the route to various meta-materials has been outlined through their bottom-up self-assembly. Unfortunately, making particles with well-defined shape and surface chemistry often requires considerable effort and time, and as such, they are available only in restrictive yields. Here we report a synthetic methodology, which we refer to as mix-and-melt reactions (MMR), that allows for rapid prototyping and mass production of anisotropic core shell colloids. MMR take advantage of the synergistic properties between common colloidal suspensions by aggregating then reconfiguring polystyrene shell particles onto core particle substrates. By systematically exchanging cores and shells, the resultant core shell particle's properties are manipulated in a modular fashion. The influence of the constituent particles' size ratio is extensively explored, which is shown to tune shell thickness, change the aspect ratio of shells on anisotropic cores, and access specific shapes such as tetrahedra. Beyond particle shape, mixed shell systems are utilized to create regular surface patches. Surface Evolver simulations are used to demonstrate how randomly packed clusters melt into regular shapes via a shell compartmentalization mechanism.