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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。
The influence of particle surface charge on the particle size measurement by resistance pulse (RPS) is reported. The effects of phosphate buffered saline (PBS), 1.0 mmol / L sodium dodecyl sulfate (SDS) anionic surfactant solution and cetyl trimethyl bromide Ammonium chloride (CTAB) cationic surfactant solution, a diameter of 2μm polystyrene particles generated in the detection zone amplitude of the pulse signal, and calculate the effective particle size particles. The results show that the amplitude of the RPS signal generated by the surfactant-treated particles is larger than that of the untreated particles at the same voltage, which phenomenon can be thickened by the double-layer thickening of the polystyrene particles with a high surface charge Explanation. The research results help to fully understand the impact of the resistance pulse method on measuring the particle size with high surface charge particles.