屏障膜

Abstract(#br)This work describes a setup for the experimental and theoretical study of the mass transport of a penetrant through a two-dimensional model-material microstructure consisting in a homogeneous matrix with slender obstacles. Experiments were performed using polydimethylsiloxane (PDMS) specimens with a controlled pattern of randomly distributed laser-ablated microscopic slender holes that mimic the obstacles to the diffusion of the penetrant, 1-octadecanol (ODOL). Mass transport of ODOL throughout the patterned PDMS matrix was monitored by means of Confocal Raman microscopy.

本工作描述了一个用来表征阻挡膜对传质有效扩散系数的装置。由弹性体聚二甲基硅氧烷( PDMS )基体制备出具有可控和良好势垒微结构的膜。物质输运的物理障碍是通过在具有明确形状和特定位置的基体微孔中雕刻产生的。横向拉曼光谱是用来跟踪渗透分子十六醇( HDOL )在雕刻基体中的质量输运。通过对HDOL拉曼强度随时间变化的监测，研究了圆孔和拉长孔通过势垒微结构后对质量输运的影响。将结果与计算机模拟的质量输运进行了比较，发现了很好的一致性。结果表明，空穴对HDOL起二维阻挡作用，HDOL在阻挡膜中的有效扩散系数相对于均质材料降低。总体而言，拉曼测量为对比异质势垒膜的传质理论模型提供了有价值的数据生成基础。