The Deposition of Submicron Fluorescent Aerosol Particles by a Closed-Loop Flow System
The Deposition of Submicron Fluorescent Aerosol Particles by a Closed-Loop Flow System
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DOI：
10.11203/jar.33.102
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
F. Faizal;S. Saallah;A. Takagi;I. Lenggoro
中科院分区：
文献类型：
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作者：
F. Faizal;S. Saallah;A. Takagi;I. Lenggoro
已经建立了一个气溶胶流动系统来模拟颗粒向气液界面的输送。用超声雾化器喷雾制备了亚微米级荧光核壳二氧化硅颗粒的胶体悬浮液。通过数值模拟研究了气溶胶的沉降动力学，确定了载气流量，并通过实验进一步验证了这一点。荧光显微镜是一种非真空成像技术，用来观察沉积在衬底上的颗粒。结果表明，颗粒的表观(荧光)尺寸分布从2.9±6.0μm移动到1.7±2.2μm，这与胶体悬浮液浓度变化引起的团聚体尺寸从0.70μm移动到0.2 4μm有关。此外，颗粒间距离分析表明，悬浮液的浓度对分散在基材上的颗粒的均匀性没有显著影响。因此，本文提出的方法有可能用于在各种类型的衬底(即气液界面)上沉积和分析亚微米粒子，而不需要真空成像分析(例如电子显微镜)。
An aerosol flow system has been constructed to mimic the delivery of particles to the air-liquid interface. A colloidal suspension of submicron fluorescent core-shell silica-based particles was sprayed by an ultrasonic nebulizer. The dynamics of the aerosol settling was investigated by numerical simulation to determine the carrier gas flow rate, which was further verified through experimentation. Fluorescent microscopy, a non-vacuum imaging technique, was used to observe the particles deposited on the substrate. It was found that the apparent (fluorescent) size distribution was shifted from 2.9 ± 6.0 μm to 1.7 ± 2.2 μm, which is correlated to the shift in the aggregate size from 0.70 μm to 0.24 μm due to the changes in the colloidal suspension concentration. In addition, the uniformity of the particles dispersed on the substrate was not significantly affected by the suspension’s concentration, as confirmed by the inter-particle distance analysis. It is therefore suggested that the method presented here may potentially be applied for the deposition and analysis of submicron particles on various types of substrate (i.e. air-liquid interface) without the need for vacuum imaging analysis (e.g. electron microscopy).