本文通过流体力学及COMSOL等仿真软件分析,以PDMS为材料,设计制作了用于捕获两个球形颗粒样品的微流控芯片,并基于光电倍增管(PMT)和电动位移平台,搭建了角度扫描式大动态范围散射光测量装置。该系统可以快速捕获两个球形颗粒,在颗粒捕获后对微流控芯片内沟道与外轮廓进行折射率匹配,持续测量实际捕获颗粒的1°至170°的散射光。对23.75 μm、31.10 μm、40.01 μm三种粒径的聚苯乙烯标准颗粒样品进行了实验研究,并多次重复测量同一粒径双颗粒的散射光分布。基于微流控芯片的双颗粒体散射函数测量方法可以稳定的捕获、释放双颗粒,实验操作简单且具有较好的重复性,在颗粒物体散射函数研究方面具有很大的潜力。
Abstract
In this work,a new approach to measuring the volume scattering function of dual microspheres in a wide angular range is developed.The polydimethylsiloxane microfluidic chip is designed by the simulation of COMSOL,and is supposed to capture dual particles efficiently.After refractive index matching of microfluidic and the chip,this system can measure scattering light from 1° to 170° in a continuous way.Standard polystyrene particles with a size of 23.75 μm,31.10 μm,and 40.01 μm are used as experimental samples.The high stability of the capture and the good repeatability of the experiment makes it having great potential in the study of the volume scattering function.
关键词
光散射 /
颗粒体散射函数 /
微流控芯片 /
颗粒团簇散射
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Key words
light scattering /
volume scattering function of particle /
microfluidic chip /
particle cluster scattering
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参考文献
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脚注
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基金
国家自然科学基金(61775065)、中央高校基本科研业务费专项资金资助(2018KFYYXJJ060)
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