Microcapsulation during pulsed expansion of TiO2 suspension in polyethylene glycol solution in supercritical CO2 into background gas

Abstract

Microcapsulation of titanium dioxide nanoparticles in polyethylene glycol PEG 8000 is performed under pulsed expansion of a jet of polymer solution in supercritical carbon dioxide into the background medium of sulfur hexafluoride and carbon dioxide. Either globule-shaped microcapsules or a film consisting of the product of the bulk intermolecular condensation of the coils are deposited on a substrate. The dependence of the quality and composition of the product deposited from the jet on the type of the background gas and its pressure in a range from 0.125 to 3 atm is investigated.