最近,由于多功能液体操纵表面在生物医学运输中的关键作用,微流体,化学工程,对定向液体运输的可控和功能性方面的需求显着增加。然而,设计一个易于制造和功能齐全的智能操作表面仍然是一个巨大的挑战。为了应对这一挑战,报告了可以通过温度调节图案化通道内液体输送速率的智能表面。使用聚(N-异丙基丙烯酰胺)和微柱形状记忆聚合物(SMP)的协同控制方法来调节液体在表面上的润湿速率。通过飞秒激光直写,温度响应复合材料表面以图案化方式嵌入形状记忆聚合物(SMP)的微观结构中,导致制备新型可编程液体操纵表面,其中包含具有不对称润湿性的边界。由于智能表面基于SMP,超疏水/可控润湿性图案化平台中的超疏水部分也被编程用于液滴定向传输,它利用可重写压痕轨迹和周边之间的润湿性差异,允许液滴流入温度控制的速度轨迹,丰富了表面的功能。此外,基于其出色的可控性和图案化,该表面已被证明用于具有自清洁特性的微流体电路芯片中,为电路时序控制提供了新的思路。这项研究为有效开发多功能液体转向表面提供了有希望的前景,芯片实验室,和微流体装置。
Recently, due to the crucial roles of multifunctional liquid manipulation surfaces in biomedical transportation, microfluidics, and chemical engineering, the demand for controllable and functional aspects of directed liquid transportation has increased significantly. However, designing an intelligent manipulation surface that is easy to manufacture and fully functional remains an immense challenge. To address this challenge, a smart surface that can regulate the rate of liquid transport within a patterned channel by temperature is reported. A synergistically controlled approach of poly(N-isopropylacrylamide) and micropillar shape-memory polymers (SMPs) was used to modulate the wetting rate of liquids on surfaces. By femtosecond laser direct writing, temperature-responsive composite surfaces are embedded in the microstructure of shape-memory polymers (SMPs) in a patterned manner, resulting in the preparation of novel programmable liquid manipulation surfaces incorporating boundaries possessing asymmetric wettability. Since the smart surface is based on SMP, the superhydrophobic part in the superhydrophobic/controllable wettability patterning platform is also programmed for droplet directional transport, which takes advantage of the difference in wettability between the rewritable indentation track and the periphery to allow droplets to flow into the temperature-controlled velocity track, enriching the functionality of the surface. In addition, based on its excellent controllability and patterning, the surface has been shown to be used in microfluidic circuit chips with self-cleaning properties, which provides new ideas for circuit timing control. This study provides promising prospects for the effective development of multifunctional liquid steering surfaces, lab-on-a-chip, and microfluidic devices.