Dynamic interfaces for contact-time control of colloidal interactions.
Dynamic interfaces for contact-time control of colloidal interactions.
复制标题
用于胶体相互作用的接触时间控制的动态接口。
DOI：
10.1039/d3sm00673e
复制
发表时间：
2023
期刊：
影响因子：
3.4
通讯作者：
Takatori,ShoC
中科院分区：
文献类型：
--
作者：
Xu,Yaxin;Choi,KyuHwan;Nagella,SachitG;Takatori,ShoC
了解非平衡状态下胶体粒子之间的成对相互作用对胶体自组装等动力学过程具有深远的影响。然而，传统的胶体相互作用在胶体时间尺度上是有效的准静态的，不能被调制出平衡。在胶体接触过程中动态调节相互作用的机制可以为自组装和材料设计提供新的途径。在这项工作中，我们开发了一个基于聚合物涂层胶体的框架，并证明了聚合物在胶体接触界面的平面内表面迁移率和机械松弛能够实现有效的动态相互作用。结合分析理论，模拟和光镊子实验，我们展示了在皮牛顿力和秒时间尺度范围内动态对相互作用的精确控制。我们的模型有助于进一步了解非平衡胶体组件，同时通过界面调制和非平衡处理提供广泛的设计自由。
Understanding pairwise interactions between colloidal particles out of equilibrium has a profound impact on dynamical processes such as colloidal self assembly. However, traditional colloidal interactions are effectively quasi-static on colloidal timescales and cannot be modulated out of equilibrium. A mechanism to dynamically tune the interactions during colloidal contacts can provide new avenues for self assembly and material design. In this work, we develop a framework based on polymer-coated colloids and demonstrate that in-plane surface mobility and mechanical relaxation of polymers at colloidal contact interfaces enable an effective, dynamic interaction. Combining analytical theory, simulations, and optical tweezer experiments, we demonstrate precise control of dynamic pair interactions over a range of pico-Newton forces and seconds timescales. Our model helps further the general understanding of out-of-equilibrium colloidal assemblies while providing extensive design freedom via interface modulation and nonequilibrium processing.