Kinetic features of aerosol formation in the branched chain process of dichlorosilane oxidation under static conditions: I. Initiated ignition

It is found experimentally that the initial pressure of aerosol formation p rogressively decreases with an increase in the initial concentration of dic hlorosilane in the initiated ignition of dichlorosilane mixtures with oxyge n at 293 K. The dependence of the maximal aerosol concentration on the tota l pressure is S-shaped. A generalized kinetic scheme is proposed that quali tatively describes the regularities observed in the experiments. The most i mportant calculated parameters are the heat evolved in the chain process an d the dependence of the pressure of the saturated vapor of a new phase on t emperature. It is shown that the specific features of branched-chain proces ses under nonisothermic conditions determine the kinetic regularities of ne w phase formation. The optimal range of pressures is recommended for obtain ing particles with as low dispersivity as possible.