Determination of the Critical Temperature and Critical Pressure of Five Compounds

The critical properties of five compounds, including propanal,butanal, 1-pentanal, 2-methel butanal and trimer of ethanal, weredetermined for the first time by a new capillary quick-flow method.The apparatus was improved with a capillary tube and checked withhexane and 10heptene as standard reagents. The experimental resultsproved that the determination of critical properties by quick-flowmethod with a capillary tube apparatus was successful.

Wet Transfer Model of Woven Fabric

To investigate wet permeability of woven fabric, a wet transfer model of woven fabric is built up and by means of the model, the main factors which have significant influences on its wet permeability function, including liquid/material contact angle, fiber diameter, fiber cross-section configuration, the number of fibers, yarn’s twisting angle and woven density, are discussed. Finally it is derived from the argument that optimal design of wet transfer function of woven fabric can be obtained.

侧流试纸孔径优化数值模型

纸基微流控芯片由于成本低、比表面积大以及良好的生物兼容性等优势在即时检测领域得到快速发展,但是纸基孔隙结构对于检测性能的影响规律和机制尚不清晰。本文针对侧流试纸这一典型纸基微流控芯片,通过将硝酸纤维素膜多孔结构简化为毛细平板通道,首次建立了耦合毛细流动和反应输运过程的数值模型,研究了样品液滴流速以及硝酸纤维素膜比表面积对检测信号生成的竞争机制。研究结果表明,样品液滴流速的增加以及更大的膜比表面积均可增强检测信号,且硝酸纤维素膜孔径存在最优值以提高检测灵敏度,为硝酸纤维素膜材料的微观设计优化指明了方向。