AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Chemical Reactions on Optically Trapped Single Particles
CHUJI WANG, Zhiyong Gong, Gorden Videen, Yong-Le Pan, Mississippi State University
Abstract Number: 339 Working Group: Instrumentation and Methods
Abstract Single-particle study is an emerging research topic in aerosol science and engineering, which is made possible by recent developments in optical trapping and manipulation techniques. From optical tweezers, the early approach which uses a single tightly focused laser beam to levitate and trap non-absorbing micron-sized particles, to the recently developed optical traps such as the universal optical trap (UOT) that can trap particles of arbitrary chemical and physical properties in different media, optical trapping finds it new applications in aerosol. When a particle is optically levitated in air, it is free from chemical and physical surface interference as well as electrical charge. To date, a wide variety of single particles including carbons, dusts, metal oxides, pollens, spores, organic/inorganic droplets, etc. have been characterized using cavity ringdown spectroscopy, Raman spectroscopy, light scattering, imaging, and or laser-induced fluorescence. As single particles can be trapped stably in the UOT for a long period of time, temporal evolution on chemical and physical properties of trapped particles can also be studded. Very recently, we have demonstrated that we can use a trapped particle as a micro-reactor to study chemical reactions. We report our latest efforts and progresses in this new adventure.