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Electrospinning in compressed carbon dioxide: Hollow or open-cell fiber formation with a single nozzle configuration by Jun Liu; Zhihao Shen; Sang-Ho Lee; Manuel Marquez; Mark A. McHugh is a Engineering article available to read on EtoBox.

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Electrospinning is combined with the PCA (precipitation with a compressed fluid antisolvent) process (ES-PCA) to produce micron to submicron polymeric fibers with open-cell or hollow core morphology. CO 2 is used as the compressed gas of choice and the impact of CO 2 pressure (density) on fiber morphology is demonstrated for the poly(vinyl pyrrolidone) (PVP)-dichloromethane, PVP-ethanol, poly(vinylidenefluoride) (PVDF)-dimethylacetamide, and PVDF-dimethyl formamide systems. CO 2 , which is in excess for this process, rapidly extracts solvent from the surface of the liquid jet to form a vitrified polymer skin and also dissolves into the liquid jet and induces the polymer-solvent solution to phase separate. The ES-PCA technique has the advantage that fiber morphology can be easily controlled via pressure and pressures in excess of 100 bar are not needed to obtain a variety of different fiber morphologies. The fiber formation process correlates closely with the binary solvent-CO 2 and ternary polymer-solvent-CO 2 phase behavior.

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Author

Jun Liu; Zhihao Shen; Sang-Ho Lee; Manuel Marquez; Mark A. McHugh

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0896-8446)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)