Morphological characterization of carbon nanofiber aerosol using tandem mobility and aerodynamic size measurements.
Deye-GJ; Kulkarni-P; Ku-BK
J Nanoparticle Res 2012 Sep; 14(9):1112
Characterizing microstructural and transport properties of non-spherical particles, such as carbon nanofibers (CNF), is important for understanding their transport and deposition in human respiratory system and engineered devices such as particle filters. We describe an approach to obtain morphological information of non-spherical particles using a tandem system of differential mobility analyzer (DMA) and an electrical low-pressure impactor (ELPI). Effective density, dynamic shape factors (DSF), particle mass, and fractal dimension-like mass-scaling exponent of nanofibers were derived using the measured mobility and aerodynamic diameters, along with the known material density of CNF. Multiple charging of particles during DMA classification, which tends to bias the measured shape factors and particle mass toward higher values, was accounted for using a correction procedure. Particle mass derived from DMA-ELPI measurements agreed well with the direct mass measurements using an aerosol particle mass analyzer.
Particulates; Nanotechnology; Humans; Men; Women; Filters; Respiration; Morphology; Aerosols; Aerosol-particles; Analytical-processes; Particle-aerodynamics;
Author Keywords: Microstructure characterization; Nanofiber; Effective density; Dynamic shape factor; Particle mass
Pramod Kulkarni, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, MS: R-3, Cincinnati, OH 45226
Journal of Nanoparticle Research