Capillary assembly of colloidal particles on patterned surfaces
Capillary assembly of colloidal particles on patterned surfaces
复制标题
胶体颗粒在图案表面上的毛细管组装
DOI：
10.1088/1367-2630/ab7f90
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发表时间：
2020
影响因子：
3.3
通讯作者：
Guangyin Jing
中科院分区：
文献类型：
--
作者：
Mo Zhou;Yanan Liu;Peixin Zhang;Yuting Miao;Hao Luo;Guangyin Jing
微小物体之间弯月面处的毛细吸引力在自组装过程中起着至关重要的作用。由拉普拉斯方程控制的弯月面的形状致力于与DLVO定义的力不同的长程吸引。而不是考虑理想的光滑表面上的捕获颗粒，我们使用有序的纳米阵列的图案化基板的理论建模朝向毛细管组件。发现颗粒的垂直高度改变了颗粒间弯月面的形状，从而改变了相互作用能和毛细力。提出了一种最小模型，用以确定颗粒间的毛细作用力，从而确定颗粒的运动性，从而作为胶体颗粒结晶的判据。事实证明，胶体晶体或无定形介质的形成取决于按其尺寸缩放的颗粒分离与支撑纳米阵列的几何设计之间的优化。最后，我们通过实验证实了胶体悬浮液的毛细管组装，通过发挥我们的理论模型中定义的控制参数，与一个很好的协议。这个模型系统可以模拟实际应用的纳米结构制造的功能性目的的多功能真实的表面。
Capillary attraction at the meniscus between tiny objects plays a crucial role in self-assembly processes. The shape of the meniscus governed by the Laplace equation devotes to a long-range attraction distinct to the DLVO defined forces. Rather than considering trapped particles on ideal smooth surfaces, we use patterned substrates with ordered nano-arrays for theoretical modeling toward the capillary assembly. The vertical elevation of particles is found to change the shape of the meniscus between particles, therefore the interaction energy and capillary force. A minimal model is developed to determine the capillary force between particles and thus the motility of particles, therefore the criterion of the crystallization of colloidal particles. It turns out that the formation of a colloidal crystal or amorphous medium depends on the optimization between the scaled particle separation by its size and the geometrical design of the supporting nano-arrays. Finally, we experimentally confirmed the capillary assembly from colloidal suspensions, by playing the control parameters defined in our theoretical model, with a nice agreement. This model system can mimic the practical applications of nano-structure fabrication on versatile real surfaces for functionality purposes.