Photochemical aerosol formation of haloidbenzenes—Comparison between theory and experiment

New Nanoparticle Formation under UV Impact on Acetaldehyde Vapor in Nitrogen and Air Flow

“…The Smoluchowski equation was solved for free-molecular collisions of monomers and clusters, similar to those described by Rao and McMurry. 12 An effective algorithm for solving the coagulation equation has been reported earlier by Dubtsov et al 9,10,13 In the present study, this model was modified to account for the influence of t 1 (time gap between the end of irradiation and the moment of particles detection) and diffusion losses of monomer and clusters on the walls of the reactor and pipelines. Similarly to Rao and McMurry, 12 Under these conditions, the dynamics of the particle concentration is described by the following equations where F(t) ) F ) constant at t e t 0 , F(t) ) 0 at t 0 e t e t 0 + t 1 (no monomer formation during t 1 ), ij is the collision constant for clusters, consisting of i and j monomers, N k is the concentration of clusters, consisting of k monomers, t 0 is the irradiation time, and t 1 is the retention time.…”

“…The Smoluchowski equation was solved for free-molecular collisions of monomers and clusters, similar to those described by Rao and McMurry. 12 An effective algorithm for solving the coagulation equation has been reported earlier by Dubtsov et al 9,10,13 In the present study, this model was modified to account for the influence of t 1 (time gap between the end of irradiation and the moment of particles detection) and diffusion losses of monomer and clusters on the walls of the reactor and pipelines. Similarly to Rao and McMurry, 12 the main approximations of this model are the following:…”

Design and Testing of a Photochemical Aerosol Generator for Calibrating Aerosol Measuring Instruments in the Submicrometer Region

“…Recently we have studied the kinetics of ultra-fine aerosol particle formation during photolysis of haloidbenzenes (PhHal, Hal = C1, Br, I) (Dubtsov et al 1989(Dubtsov et al , 1992(Dubtsov et al , 1995. As a result of this research a photochemical aerosol generator was conceived.…”

“…To a first approximation the particle mean arithmetic diameter is proportional to t : ,, while number concentration is linear with irradiation time or irradiation intensity. A detailed investigation of the influence of these parameters on the particles' concentration and size is reported by Dubtsov et al (1995) for the case of PhHal photolysis. This is also true for metal carbonyls photolysis.…”