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Supercritical Assisted Electrospray: An Improved Micronization Process
A new process is proposed that can largely improve classical electrospray (ESPR) atomization, thanks to the addition of supercritical CO(2) (SC-CO(2)) to the liquid mixture, in which a polymer is dissolved, forming an expanded liquid. The consequent reduction of surface tension and viscosity allows...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6419022/ https://www.ncbi.nlm.nih.gov/pubmed/30960228 http://dx.doi.org/10.3390/polym11020244 |
Sumario: | A new process is proposed that can largely improve classical electrospray (ESPR) atomization, thanks to the addition of supercritical CO(2) (SC-CO(2)) to the liquid mixture, in which a polymer is dissolved, forming an expanded liquid. The consequent reduction of surface tension and viscosity allows the production of micrometric or nanometric particles of controlled size and distribution at a production rate up to one hundred times that of the traditional process. The new process was applied to particle generation from a very high molecular weight polyvinylpyrrolidone (PVP) and tested at different polymer percentages by weight and at different pressures. Repeatable microparticle diameters and distributions were obtained, ranging between 0.55 and 2.25 µm at PVP concentrations from 1 to 5% w/w and pressures between 80 and 120 bar. |
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