Size effects in aerosol particle interactions: the van der Waals potential and collision rates

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5128478

Marlow, W H

Three effects which are explicitly dependent on aerosol particle size are identified and discussed. They are focussed about the particle collision rate and how it relates to the properties of the gas, the particle, and the particle's interaction potential energy which play roles in particle-particle collision rates. By incorporating the conduction electronic free path effect for conductors into the frequency-dependent dielectric constants of silver and graphite, particle size effects in the Lifshitz-van der Waals potentials for identical pairs of 1 nm and 100 nm particles are evaluated. Water and tetradecane particle interaction potentials for the same size particles are also calculated to illustrate size effects due to the retardation of the interaction. These potentials are then used to calculate the enhancement of the particle collision rates above their values in the absence of any potential at various gas pressures. The roles of the interaction potential in collision among identical pairs of particles of differing compositions is also briefly discussed.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5128478
• Report Number(s): BNL-28348; CONF-800993-1
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AROMATICS
BROWNIAN MOVEMENT
CARBON
COLLISIONS
COLLOIDS
CONDENSED AROMATICS
DISPERSIONS
ELEMENTS
GRAPHITE
HYDROGEN COMPOUNDS
METALS
NONMETALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE SIZE
SILVER
SIZE
SOLS
TRANSITION ELEMENTS
WATER