Accession Number:

AD1024272

Title:

Trapping of Individual Airborne Absorbing Particles Using a Counterflow Nozzle and Photophoretic Trap for Continuous Sampling and Analysis

Descriptive Note:

OSTP Journal Article

Corporate Author:

Mississippi State University Mississippi State United States

Report Date:

2014-03-19

Pagination or Media Count:

8.0

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.

Subject Categories:

  • Optical Detection and Detectors
  • Optics
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE