Electric-Field-Induced Lock-and-Key Interactions between Colloidal Spheres and Bowls
Electric-Field-Induced Lock-and-Key Interactions between Colloidal Spheres and Bowls
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DOI：
10.1021/acs.chemmater.5b04152
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发表时间：
2016-02-23
影响因子：
8.6
通讯作者：
van Blaaderen, Alfons
中科院分区：
文献类型：
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作者：
Kamp, Marlous;Elbers, Nina A.;van Blaaderen, Alfons
为了实现新的定向自组装 (SA) 途径，胶体科学和纳米科学的重点已从球形颗粒和相互作用转向日益复杂的形状和颗粒间电势。这一领域的发展得益于粒子合成方面的最新突破，例如具有互补形状的粒子，可以实现由消耗剂诱导的特定锁和钥匙相互作用。在这里，我们证明电场形成了引导凸面和凹面胶体的 SA 的替代途径，其额外优点是系统现在可以通过外部条件进行切换。实验和理论结果验证了电场诱导组装机制，并表明即使是不可逆结合的复合材料也可以通过调整力平衡来生成。不可逆复合颗粒的成功分离，结合对不同材料的推广，表明当前的机制不仅为复杂颗粒合成提供了一条通用的新路径，而且还为定向自组装提供了一条通用的新路径。
To realize new and directed self-assembly (SA) pathways, the focus in colloid science and nanoscience has shifted from spherical particles and interactions to increasingly more complex shapes and interparticle potentials. This field is fueled by recent breakthroughs in particle synthesis, such as particles with complementary shapes that allow for specific lock-and-key interactions induced by depletants. Here, we show that electric fields form an alternative route for directing the SA of convex and concave colloids, with the additional advantage that the system now becomes switchable by external conditions. Both experimental and theoretical results are presented that validate the electric-field-induced assembly mechanism and show that even irreversibly bound composites can be generated by tuning the force balance. The successful isolation of the irreversible composite particles, in combination with generalization to different materials, shows that the current mechanism provides a versatile new path not only toward complex-particle synthesis but also toward directed self-assembly.