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表面为良导体微球的电动旋转研究是一项对无标记生物传感器开发等领域具有重要意义的新技术,未见相关报道.采用化学镀金方法,分别在直径为15和25μm的聚苯乙烯微球表面包裹一层厚度约50 nm的金膜,并将此表面镀金微球作为研究对象,进行电动旋转实验研究.实验结果表明,低频段(100 Hz~100 kHz)表面镀金聚苯乙烯微球作与电场反向的电动旋转运动,且相同条件下,对应最大旋转速度高于表面未修饰聚苯乙烯微球.以行波交流电渗及诱导电渗理论为基础,对表面镀金聚苯乙烯微球的电动旋转现象进行定性分析,并通过纳米荧光粒子实验表征镀金微球周围的流体流动现象,验证了定性分析的合理性.推导了行波交流电渗导致的表面镀金聚苯乙烯微球的电动旋转速度公式,并与实验结果进行对比分析,二者具有较好的一致性.
The study of electrospinning of good conductor microspheres is a new technique which has important significance for the development of unmarked biosensors and has not been reported yet.Using electroless gold plating method, respectively, in the micro-diameter of 15 and 25μm polystyrene micro The surface of the ball is covered with a gold film with a thickness of about 50 nm, and the surface of the gold-plated microspheres is taken as the research object to conduct the electric rotation experiment.The experimental results show that the surface of the low frequency band (100 Hz ~ 100 kHz) And the electric rotation opposite to the electric field, and under the same conditions, the corresponding maximum rotation speed is higher than that of the surface unmodified polystyrene microspheres.Based on AC wave and induced electroosmosis theory, The electric rotation phenomenon of the ball was qualitatively analyzed and the fluid flow phenomenon around the gold-coated microspheres was characterized by nano-fluorescent particle test to verify the rationality of the qualitative analysis. The electric motion of surface-plated polystyrene microspheres Rotation speed formula, and compared with the experimental results, the two have good consistency.