Controlled transition of microcapsules from coil conformation to globule during the expansion of the pulse jet of nanoparticle suspension of TiO2 in supercritical (CO2) polyethylene glycol solution
[Display omitted] •Microencapsulation of TiO2 in supersonic jet of supercritical CO2 has been studied.•Dependence of microcapsule collapse point position was established.•Re-entrant (globule-coil) transition was recorded downstream of the collapse point.•Conditions in the nozzle are the factors that...
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| Published in: | Chemical physics Vol. 530; p. 110581 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier B.V
01-02-2020
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| Online Access: | Get full text |
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| Summary: | [Display omitted]
•Microencapsulation of TiO2 in supersonic jet of supercritical CO2 has been studied.•Dependence of microcapsule collapse point position was established.•Re-entrant (globule-coil) transition was recorded downstream of the collapse point.•Conditions in the nozzle are the factors that determine the microcapsule quality.
The process of microencapsulation of titanium dioxide nanoparticles during the expansion of a supersonic jet of TiO2 suspension in a solution of polyethylene glycol (PEG 8000) in supercritical CO2 into a vacuum and background gas (helium) has been studied experimentally. The dependence of the position of the microcapsule transition point on the jet axis from the coil to a globular conformation on the temperature in the reactor and on the pressure of the background gas at different co-solvent concentrations has been established. A re-entrant (globule-coil) transition has been recorded at a greater distance from the nozzle exit than the point of collapse. |
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| ISSN: | 0301-0104 |
| DOI: | 10.1016/j.chemphys.2019.110581 |