Trapping of individual airborne absorbing particles using a counterflow nozzle and photophoretic trap for continuous sampling and analysis
Abstract
We describe an integrated opto-aerodynamic system and demonstrate that it enables us to trap absorbing airborne micron-size particles from air, hold them and then release them, and to repeat this sequence many times as would be appropriate for continuous sampling of particles from air. The key parts of the system are a conical photophoretic optical trap and a counter-flow coaxial-double-nozzle that concentrates and then slows particles for trapping. This technology should be useful for on-line applications that require monitoring (by single particle analyses) of a series of successively arriving particles (e.g., from the atmosphere or pharmaceutical or other production facilities) where the total sampling time may last from minutes to days, but where each particle must be held for a short time for measurements (e.g., Raman scattering).
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 17, 2014
- Source ID
- 10.1063/1.4869105
Entities
People
- Chuji Wang
- Joshua L. Santarpia
- Leonid A. Beresnev
- Mark Coleman
- Steven C. Hill
- Yong-Le Pan
Organizations
- Army Research Office
- Mississippi State University
- Sandia National Laboratories
- United States Army Research Laboratory