Formation of microcapsules containing titanium dioxide nanoparticles by pulse expansion of a supercritical solution into a background gas
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The formation of microcapsules with a core of TiO2 nanoparticles in a shell of polyethylene glycol by pulse expansion (pulse duration of 400 µs) of a supersonic jet of TiO2-suspension in a supercritical solution of polyethylene glycol (PEG 8000) in CO2 into a background gas (He) is studied. It is shown that the size of capsules and the content of TiO2 in them depend on the pressure of the background gas in the inlet chamber in the range from 0.125 to 3 atm. The upper (1.5 atm) and the lower (0.25 atm) limits of the pressure range, in which microcapsules with a relatively high content of titanium dioxide are formed, are determined.
Keywordspulsed supersonic jet formation of microcapsules TiO2 nanoparticles
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