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首页> 外文会议>International Conference on Microchannels and Minichannels >DEVELOPMENT OF A SILICON-BASED WETTABILITY CONTROLLED MEMBRANE FOR MICROSCALE TWO-PHASE SYSTEMS
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DEVELOPMENT OF A SILICON-BASED WETTABILITY CONTROLLED MEMBRANE FOR MICROSCALE TWO-PHASE SYSTEMS

机译：用于微观两相系统的硅基润湿性控制膜的研制

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Surface structure modification and wettability control are very crucial for the advancement in microfluidic systems. The wettability control of the surface is achieved by depositing a Self-Assembled Monolayer (SAM) on the surface. The technology of SAM has been advanced by coating the selective interior regions of silicon wafer. This was accomplished using a mask wafer with open slots attached to define the areas that need to be coated. Besides the capability of controlling the wettability, structure modification such as controlling hole size leads to the magnification of the influence of surface tension force. As the size of the hole gets smaller, the surface tension could become a dominant force. This paper utilizes a unique approach to improve the water and air management at the cathode of a micro Direct Methanol Fuel Cell (DMFC). Both structure modification and local surface wettability control are utilized. A two-inch silicon wafer is formed of alternate strips of hydrophobic and hydrophilic zones with arrays of holes of different sizes. Water will be guided along the hydrophilic wetting zones with large hole openings; while the air goes into the cathode from the hydrophobic dry areas with smaller holes. This process ensures that the cathode is not flooded by water while air passes easily. The excess water at the cathode could be pumped back by a micro-pump to the anode so that the size of water storage will be minimized. Therefore, most of the storage reservoir space is used for the pure methanol, which enables the achievement of a high power density of the system. In this study, a silicon-based membrane is built accordingly to observe the water and air management. Images of the CCD camera showed clearly that the water drained from the big holes without blocking the air passages.
机译：表面结构改性和润湿性控制对于微流体系统的进步非常重要。通过在表面上沉积自组装的单层（SAM）来实现表面的润湿性控制。通过涂覆硅晶片的选择性内部区域来进行SAM技术。这是使用带有开口槽的掩模晶片完成的，以限定需要涂覆的区域。除了控制润湿性的能力之外，诸如控制孔尺寸的结构改性导致表面张力影响的放大率。随着孔的尺寸变小，表面张力可能成为主导力。本文利用了一种独特的方法来改善微直接甲醇燃料电池（DMFC）的阴极处的水和空气管理。使用结构改性和局部表面润湿性控制。两英寸硅晶片由具有不同尺寸的孔阵列的疏水性和亲水区域的替代条带形成。水将沿着具有大孔开口的亲水润湿区域引导;虽然空气从具有较小孔的疏水干燥区域进入阴极。该过程确保阴极不被水淹没，而空气容易通过。阴极上的多余水可以通过微泵向阳极泵回，使得储水的尺寸将被最小化。因此，大多数储存储存器空间用于纯甲醇，这使得能够实现系统的高功率密度。在该研究中，相应地建立了一种基于硅基膜，以观察水和空气管理。 CCD摄像机的图像显然显示了水从大孔中排出而不会阻挡空气通道。

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