微流控芯片上水中油滴及其体积分数测量技术  

Oil Drops in the Water and the Oil Volume Fraction Measurement in the Microfluidic Chip

作　　者：吴章嘉琛 孙润哲[1] 潘新祥[1] 宋永欣[1] 

机构地区：[1]大连海事大学轮机工程学院,辽宁大连116026

出　　处：《微纳电子技术》2015年第5期310-317,共8页Micronanoelectronic Technology

基　　金：国家自然基金面上项目(51479020)

摘　　要：提出了一种用差分电阻脉冲微流控芯片快速检测水中油份含量的技术。采用注射泵将模拟油污水样品恒流量在微流控芯片主通道进行输运,主通道两端施加一定幅值的直流电压。当水中油滴通过电阻脉冲检测(RPS)的检测区域时,使检测区域的电阻发生变化,从而改变检测区域两端的电压,并以脉冲电压信号的形式被检测系统检测到,脉冲信号的个数反映了水中油滴的数量,而脉冲信号的幅值则反映了油滴的体积,从而可快速测定水中的油份体积分数。实验结果表明:采用RPS微流控芯片可准确实现水中油滴的检测以及水中油份体积分数的测定,具有结构简单、检测精度高等特点,有望实现含油污水中油份体积分数的现场检测。A quick detection technique for the oil content in the oily water was proposed with the differential resistive pulse microfluidic chip. The simulated oily water sample was pumped into the main channel of the microfluidic chip with the constant flow by the injection pump, and the DC voltage of a certain amplitude was applied across the main channel. When the oil drop of the oily water sample goes through the resistive pulse sensing （RPS） area, the resistance of the detection area will change, thus the voltage at both ends of the detection area changes, which is detected as the pulse voltage signal by the detecting system. The number of the pulse signals reflects the number of the oil drops, and the amplitude of the pulse signals reflects the volume of the oil drops, thus the oil volume fraction in the water can be calculated quickly. Experimental results show that the oil drop in the oily water can be detected accurately and the oil volume fraction in the oily water can be calculated by the RPS microfluidic chip. The presented method has some advantages of simple structure and high accuracy, which makes it possible to be applied to the on-site test for the oil volume fraction in the oily sewage.

关 键 词：电阻脉冲检测(RPS)技术 微流控芯片 油滴检测 油份体积分数 脉冲信号 

分 类 号：O35[理学—流体力学] TH703[理学—力学]