TY - JOUR

T1 - Structure and optical properties of soot aerosol in a moist atmosphere

T2 - 1. Structural changes of soot particles in the process of condensation

AU - Mikhailov, Eugene F.

AU - Vlasenko, Sergey S.

N1 - Funding Information: ACKNOWLEDGMENTS This study was supported by the Russian Foundation for Basic Research, project no. 05-05-64756 (Investigation of the Condensation Growth of Smoke Aerosol: Influence of the Morphology and Chemical Composition). Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2007/4

Y1 - 2007/4

N2 - A laboratory setup and a procedure for measuring the volume coefficients and mean cross sections of extinction, scattering, and absorption of soot particles in the medium of saturated water vapor are described. A method for hydrophilization of the surface of soot particles, which makes it possible to obtain model objects with specified hygroscopic properties, is presented. The processes of transformation of soot particles are analyzed with the use of data of electron-microscopic investigations on the basis of the fractal approach. The structural parameters of hydrophobic soot are shown to depend on the conditions of moistening, whereas hydrophilic particles are subject to substantial structural changes indicative of their watering. Investigation of the coagulation of soot particles with drops shows that hydrophobic particles form a weakly bound system; they coagulate on the surface of drops and cause no changes in the structure of soot aggregates. During the coagulation, hydrophilic soot particles penetrate inside a drop and irreversibly form a mixed system.

AB - A laboratory setup and a procedure for measuring the volume coefficients and mean cross sections of extinction, scattering, and absorption of soot particles in the medium of saturated water vapor are described. A method for hydrophilization of the surface of soot particles, which makes it possible to obtain model objects with specified hygroscopic properties, is presented. The processes of transformation of soot particles are analyzed with the use of data of electron-microscopic investigations on the basis of the fractal approach. The structural parameters of hydrophobic soot are shown to depend on the conditions of moistening, whereas hydrophilic particles are subject to substantial structural changes indicative of their watering. Investigation of the coagulation of soot particles with drops shows that hydrophobic particles form a weakly bound system; they coagulate on the surface of drops and cause no changes in the structure of soot aggregates. During the coagulation, hydrophilic soot particles penetrate inside a drop and irreversibly form a mixed system.

UR - http://www.scopus.com/inward/record.url?scp=34248657979&partnerID=8YFLogxK

U2 - 10.1134/S0001433807020053

DO - 10.1134/S0001433807020053

M3 - Article

AN - SCOPUS:34248657979

VL - 43

SP - 181

EP - 194

JO - Izvestiya - Atmospheric and Oceanic Physics

JF - Izvestiya - Atmospheric and Oceanic Physics

SN - 0001-4338

IS - 2

ER -