Effluent Separation by Surface-Active Agents
Final rept. Jan 1972-Dec 1973
CALSPAN CORP BUFFALO NY
Pagination or Media Count:
The purpose of this program was to apply basic surface chemical theory to developing simple means for nondestructively separating the submicrometer constituents of complex multicomponent agglomerates obtained as samples for environmental quality assessment. The techniques evaluated in this program do not significantly modify the constituents while arraying them on substrates suitable for microscopic, spectroscopic, or x-ray analysis. Typical experiments involved mixing the agglomerates to be separated with various solid spreading aids, liquid spreading aids, adhesive and autophobic agents. Agglomerates treated with such materials were then exposed to interfacial stresses expected to supply the energy necessary to array these mixtures into monolayer surface films. The best technique found involves as a first step ultrasonic dispersion of particulate material in the presence of one of the spreading aids. The colloidal dispersion introduced to a gasliquid interface in order to transform the particles in the volume phase into a permanent two- dimensional array. Polymeric spreading aids serve the purpose of distributing the particles over the surface and fixing them in an immobile binder layer. Brief recommendations for future work are outlined.
- Physical Chemistry