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Study on Functionality and Surface Modification of a Stair-Step Liquid-Triggered Valve for On-Chip Flow Control

机译:用于片上流量控制的楼梯液触发阀的功能和表面改性研究

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摘要

Distinctive from other forms of microfluidic system, capillary microfluidics is of great interest in autonomous micro-systems due to its well-engineered fluidic control based on capillary force. As an essential component of fluidic control in capillaric circuits, micro-valves enable sequential fluidic operations by performing actions such as stopping and triggering. In this paper, we present a stair-step liquid-triggered valve; the functionality of the valve and its dependencies on geometry and surface modification are studied. The surface contact angle of the microfabricated valves that are coated by polyethylene glycol (PEG) or (3-Aminopropyl) triethoxysilane (APTES) is evaluated experimentally, and the corresponding reliability of the valve structure is discussed. Moreover, the variation in the surface contact angle over time is investigated, indicating the shelf time of the device. We further discuss the overall fluidic behavior in such capillary valves, which benefits the capillaric circuit designs at the initial stage.
机译:与其他形式的微流体系统不同,毛细管微流体对自主微型系统具有很大兴趣,因为基于毛细管力的良好的工程化流体控制。作为毛细管电路中的流体控制的必要组分,通过执行诸如停止和触发的动作,微阀能够升序流体操作。在本文中,我们展示了一个楼梯步骤液体触发阀;研究了阀门的功能及其对几何和表面改性的依赖性。通过实验评估通过聚乙二醇(PEG)或(3-氨基丙基)三乙氧基硅烷(APTES)涂覆的微羧酸阀的表面接触角,并讨论了阀结构的相应可靠性。此外,研究了表面接触角随时间的变化,表明装置的储备时间。我们进一步讨论了这种毛细管阀中的整体流体行为,这有利于初始阶段的毛细管电路设计。

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