颗粒表面电荷对电阻脉冲法测量粒径的影响  

Effect of the Surface Charge of Particles on Particle Sized by the Resistive Pulse Sensing Technique

作　　者：倪文学[1] 孙润哲[2] 王成法[1] 李珺[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 [2]中国船级社天津分社,天津300457

出　　处：《微纳电子技术》2015年第8期531-536,共6页Micronanoelectronic Technology

基　　金：辽宁省自然科学基金资助项目(2014025020)

摘　　要：报道了颗粒表面带电量对电阻脉冲(RPS)法测量颗粒粒径的影响规律。利用微流控芯片颗粒差分电阻脉冲检测系统实验测得了磷酸盐缓冲液(PBS)、1.0 mmol/L的十二烷基硫酸钠(SDS)阴离子表面活性剂溶液和十六烷基三甲基溴化铵(CTAB)阳离子表面活性剂溶液中,直径为2μm聚苯乙烯颗粒经过检测区产生的脉冲信号幅值,并计算获得了颗粒有效粒径。研究结果表明:在相同电压下,经表面活性剂处理后的颗粒产生的RPS信号幅值比未处理的大,该现象可以通过带有高表面电荷的聚苯乙烯颗粒的双电层变厚进行解释。研究成果有助于全面认识电阻脉冲法对于测量带有高表面电荷颗粒的粒径的影响程度。Effect of the surface charge of particles on particles sized by the resistive pulse sensing （RPS） technique was reported. By using the particle difference RPS detection system in a microfluidic chip, the magnitude of the RPS pulse signal was experimentally measured, which was produced when polystyrene particles with the diameter of 2 μm in the phosphate buffered saline （PBS） solution, 1.0 mrnol/L sodium dodecyl sulfate （SDS） anionic surfactant solution and cetyl- trirnethylarnrnonium brom e （CTAB） cationic surfactant solution passed through the detection area in a rnicrofluidic chip, and the effective size of charged particles was calculated. The research results show that the magnitude of the RPS signal of the surfactant treated particles is larger than that of the untreated particles under the same measuring voltage. This may be understood by the induced thicker electrical double layer （EDL） around the surfactant treated particles with high surface charges. The research result is conducive to fully understanding the effect of the RPS technique on sizing the particles with high surface charges.

关 键 词：电阻脉冲(RPS)法 粒径测量 双电层(EDL) 表面活性剂 微流控芯片 

分 类 号：O35[理学—流体力学]