COAGULATION AND DEPOSITION IN STILL AEROSOLS OF VARIOUS SOLIDS

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Abstract
Studies have been made of the aging of magnesium oxide, zinc oxide, carbon, copal resin, and silica powder aerosols, under essentially uniform experimental conditions. The changes with time in the particulate number and in the number of particles lost from the system by deposition on chamber surfaces are well described in terms of the coagulation constant k and the deposition constant β with the aid of equations known to be applicable to ammonium chloride aerosols over a wide range of conditions. Marked differences were found in the values of k for different aerosols and lesser differences in the values of β. An electron microscope study of the shape and structure of the particles led to the conclusion that differences in these characteristics are not predominantly responsible for the observed differences in behavior, although they may be a contributing factor. A few preliminary experiments in which silica powder was dispersed through an electrically charged screen indicated that the coagulation and deposition processes are influenced by changes in the electrical charge distribution.

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