10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Single Airborne Particle Studies Using Optical Trapping and Manipulations: What We Have and What We Have Not
CHUJI WANG, Zhiyong Gong, Gorden Videen, Yong-Le Pan, Mississippi State University
Abstract Number: 966 Working Group: Aerosol Physics
Abstract Single airborne particles can be levitated, trapped, and transported in air using light force under an appropriate arrangement. Most airborne particles are nontransparent, therefore both radiation pressure force and photophoretic force account for the status of motion of the particles, which is often further compounded by many other factors, such as drag force, air turbulence, particle properties as well their changes overtime. This nature makes the single airborne particle study a challenging yet attractive topic. When a single particle is under light illumination in air, their time-dependent physical and chemical properties reveal exact particle dynamics without surface interferences from other particles. We can examine a single particle layer-by-layer, its chemical phase separation, morphology, up-take and evaporation, photochemical processes, fluorescence, Raman, and light-scattering. We can even now look at chemical compositions point-by-point within a single particle. We can also explore light controlled single particle’s motion, momentum transfer, particle sorting, and even potentially 3D display. Significant strides have been made to touch each of the aforementioned points to date, yet many more challenges in single particle studies using optical trapping and manipulations have not been addressed. These challenges also offer us an exciting opportunity to better understand airborne particles and allow us to envision new applications. This talk will discuss what we have and what we have not in single airborne particle studies using optical trapping and manipulations.