AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
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Aerosol Studies Using a Linear Electrodynamic Quadrupole
MATTHEW B. HART, Vasanthi Sivaprakasam, Paul Lane, Jozsef Czege, Jay D. Eversole, Naval Research Laboratory
Abstract Number: 484 Working Group: Single Aerosol Particle Studies - Techniques and Instrumentation
Abstract The linear electrodynamic quadrupole(LEQ) is a charged particle trapping technique that our group at the Naval Research Laboratory has developed and improved on in the past couple of years. This experimental approach provides the opportunity to investigate individual aerosol particles in controlled environments over relatively long periods of time. The geometry of an LEQ allows semi-automated, high-efficiency trapping of single or multiple particles along its symmetry axis. The method can be used to confine particle along this axis in a continuously moving stream for large population statistical measurements as well as to hold them stationary for long-term study. Thus far we have maintained and made measurements on trapped particles ranging from 0.5 µm to 60 µm diameters using the same LEQ apparatus. Separate on-going programs in our group are utilizing this experimental platform, and across these studies single particle measurements include: imaging, charge determination, aerodynamic and thermodynamic properties (including evaporation & condensation), light scattering and optical spectroscopies such as fluorescence or Raman scattering. Here we present an overview and summary of the LEQ capabilities and examples of aerosol particle measurements as well as possible future applications.