Ehrman SH
Laboratory for Radio and Environmental Chemistry, Paul Scherrer Institute, Villigen, PSI, CH-5232, Switzerland
J Colloid Interface Sci. 1999 May 1;213(1):258-261. doi: 10.1006/jcis.1999.6105.
In high temperature processes, at high concentrations, aerosol particles grow by collisions and coalescence. The rate of coalescence is an important parameter for predicting the final primary particle size. For some materials, particularly silica, predictions of final primary particle size using coalescence rates based upon bulk material properties are not in agreement with experimental results. One explanation may be that the high internal pressure in very small particles (less than 10 nm in diameter) affects the mobility of material within the particles and hence the coalescence rate. In this Note, a new approach for estimating rates of coalescence of particles in the initial stages of growth is presented. Coalescence of liquid particles is assumed to be rate-limited by atomic mobility, and the effect of internal pressure on diffusivity is considered. Copyright 1999 Academic Press.
在高温过程中，在高浓度下，气溶胶颗粒通过碰撞和聚结而长大。聚结速率是预测最终初级粒径的一个重要参数。对于某些材料，特别是二氧化硅，基于块状材料特性使用聚结速率来预测最终初级粒径与实验结果不一致。一种解释可能是非常小的颗粒（直径小于10纳米）内部的高压力会影响颗粒内物质的迁移率，进而影响聚结速率。在本笔记中，提出了一种估计颗粒生长初始阶段聚结速率的新方法。假设液体颗粒的聚结受原子迁移率限制，并考虑了内部压力对扩散率的影响。版权所有1999年学术出版社。
