The effect of H2O adsorption on cloud drop activation of insoluble particles: a theoretical framework
- ISSN: 1680-7324
- DOI: 10.5194/acp-7-6175-2007
Cloud droplet activation of wettable insoluble compounds has been studied theoretically by assuming that droplet growth happens through multilayer adsorption. The idea is to include an adsorption isotherm in K¨ ohler theory instead of the solute term. This makes it possible to de- scribe the equilibrium growth of insoluble particles and to find out their critical saturation ratios. The critical satura- tion ratios calculated in this way are comparable to those of completely soluble particles at certain ranges of adsorption isotherm parameter values. The results indicate that adsorp- tion could cause wettable insoluble compounds to activate in atmospheric conditions. However, more data on the adsorp- tion parameters for wettable organic substances is needed to confirm this conclusion.