Abstract View
Optical and Physical Properties of Manufactured Carbon Black Particles
TIMOTHY ONASCH, Brian Heffernan, Richard Miake-Lye, Andrew Freedman, Aerodyne Research, Inc.
Abstract Number: 663
Working Group: Aerosol Standards
Abstract
To date, there are no black carbon or soot particle-based absorption standards to establish traceable calibrations for instruments that measure these combustion-generated particle types. Here we report on the optical and physical properties of six select manufactured carbon black particles to assess their applicability as potential absorbing particle standards. Samples of commercially available surface-modified carbon black particles were generated by water-based atomization and diffusion drying. Monodisperse distributions were selected with a Cambustion Aerodynamic Aerosol Classifier. Particle mass and size (i.e., electrical mobility) were measured. Mobility-measured effective densities of these particles varied between particle types, but all decreased as a function of size. Optical properties were measured using a Cavity Attenuated Phase Shift (CAPS) Single Scatter Albedo (SSA) monitor operating at 630 nm. Measured mass absorption coefficients (MAC) varied between particle types and typically exhibited a maximum value between 100-400 nm, where the measured SSA values were increasing rapidly with size. These results will be discussed in the context of potential absorbing particles standards.