Mechanistic Study of the Evaporation of Liquids from Porous Microparticles.
Abstract
The objective of this study is to investigate the evaporation of volatile liquids from individual microparticles composed of an aggregate of primary porous particles. The evaporation of octyl alcohol from microparticles containing porous silica was measured using single particle electrodynamic levitation. Liquid evaporation rates were determined from changes in the particle- levitation electric field intensities. A class of Syloid silicas was chosen for this study because of their well-defined pore volumes and specific surface areas which both affect the liquid evaporation rate. It is shown that the silica matrix retards octyl alcohol evaporation, and the degree of evaporation retardation increases with decreasing silica pore radius. A shrinking core evaporation model is used to interpret experimental results, and pore radii are determined for each of the silicas. This study also demonstrates that single particle levitation can be used to determine the liquid absorption capacity of solid particles. jg p.3
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1995
- Accession Number
- ADA297042
Entities
People
- Glenn O. Rubel
Organizations
- Edgewood Chemical Biological Center