A nanofluidic system based on cylindrical polymer brushes: how to control the size of nanodroplets.
A nanofluidic system based on cylindrical polymer brushes: how to control the size of nanodroplets.
复制标题
基于圆柱形聚合物刷的纳米流体系统：如何控制纳米液滴的尺寸
DOI：
10.1039/d2sm00527a
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发表时间：
2022
期刊：
影响因子：
3.4
通讯作者：
J.-U. Sommer
中科院分区：
文献类型：
--
作者：
C.-W. Li;H. Merlitz;J.-U. Sommer
在分子动力学模拟中，我们研究了从连续流入的纳米颗粒中自组织形成液滴的过程。这种转变是由一个圆柱形的通道，装饰有聚合物刷在一个轻微的不良溶剂促进。我们分析液滴的形成和传播通过简单的缩放参数，在模拟测试。聚合物刷在边缘差的溶剂作为一个压力反馈系统，表现出崩溃过渡下的入射流的中等压力，而不需要额外的外部刺激，并最终关闭后液滴通道自发。我们的研究结果定性地证明了聚合物刷对连续流体和液滴形成的控制，并且其作为流体控制手段的有效性可用于设计在中等压力下可靠地操作的纳米流体整流装置。
In molecular dynamics simulations we investigate the self-organized formation of droplets from a continuous flow of incoming nanoparticles. This transformation is facilitated by a cylindrical channel that is decorated with a polymer brush in a marginally poor solvent. We analyze droplet formation and propagation by means of simple scaling arguments which are tested in the simulations. Polymer brushes in marginally poor solvents serve as a pressure feedback system, exhibit a collapse transition under the moderate pressure of the incident flow, without the need for additional external stimuli, and finally close spontaneously after droplet passage. Our results qualitatively demonstrate the control of polymer brushes over continuous fluids and droplet formation, and its effectiveness as a means of fluid control can be used to design nanofluidic rectification devices that operate reliably under moderate pressure.