electro spinning
DESCRIPTION
introduction of Electrospining is providedTRANSCRIPT
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Mushtaq
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Introduction Parameters of electrospining process
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This process involves the ejection of a charged polymer fluid onto anoppositely charged surface.
Multiple polymers can be combined
Control over fiber diameter and scaffold architecture
http://upload.wikimedia.org/wikipedia/commons/6/6e/Taylor_cone_photo.jpg -
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year uthor chievmentts1914 Zeleny The first one observed
the spinningbehavior of conductingpolymer solution in
electric field
1934 Formhal The first patent aboutelectrospinningprocess
1996 Reneker &Chun
The probability ofelectrospinning usingdifferent kind of polymersolution wasproved.
1981 Larrondo &Manley
Investigation ofelectrospinning usingmelting polymer
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Polymer SolventNylon 6, Nylon 6,6 Formic Acid
Polyacrylonitrile Dimethyl Formaldehyde
PET Trifluoroacetic acid/Dimethyl chloride
PVA Water
Polystyrene DMF/Toluene
Nylon 6 co-polyamide Formic Acid
Polybenzimidazo Dimethyl acetamide
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1. Solution properties, 2. Controlled variables
3. Ambient parameters
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Viscosityo one of the biggest determiners of fiber size and morphology
o The diameter of the fibers by increasing solution viscosity.
Conductivity,o Increasing the solution conductivity or charge density can be used to
produce more uniform fibers.
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Surface Tension The addition of ethanol to PEO and PVA solutions lowered the surface tension.
Another approach to reducing the surface tension of polyurethaneurea solutions wasto add polydimethylsiloxane, but no significant effect in fiber morphology wasobserved
polymer molecular weighto Increasing molecular weight reduced the number of beads and droplets
Additionally,PMMA with a narrow molecular weight distribution gave uniform fibers ata lower concentration than those with
larger molecular weight distributions.
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Flow rateo Lower flow rates yielded fibers with smaller diameters
o High flow rates produced fibers that were not dry upon reaching the Collector
Electric field strengtho At too high voltage, beading was observed Correlation between voltage and fiber
diameter was ambiguous
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Distance between tip and collectoro A minimum distance was required to obtain dried fibers
o At distances either too close or too far, beading was observed
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Needle tip design Using a coaxial, 2-capillary spinneret, hollow fibers were produced
Multiple needle tips were employed to increase throughput
Collector composition and geometry Smoother fibers resulted from metal collectors; more porous fiber structure was
obtained using porous collectors.
Aligned fibers were obtained using a conductive frame, rotating drum or a wheel-likebobbin collector.
Yarns and braided fibers were also obtained
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Temperature, Increased temperature caused a decrease in solution viscosity, resulting in smaller
fibers
Humidity, Increasing humidity resulted in the appearance of circular pores on the fibers
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http://www.thefutureisnear.org/student_research/current_research/documents/drugencapsulation/xq21.pdf
http://www.che.vt.edu/Wilkes/electrospinnin
g/electrspinning.html
http://www1.uprh.edu/npinto/papers/1ncur2001.pdf
http://physicsworld.com/cws/event/17158 http://nathan.instras.com/ResearchProposal
DB/doc-118.pdf
http://www.thefutureisnear.org/student_research/current_research/documents/drugencapsulation/xq21.pdfhttp://www.thefutureisnear.org/student_research/current_research/documents/drugencapsulation/xq21.pdfhttp://www.thefutureisnear.org/student_research/current_research/documents/drugencapsulation/xq21.pdfhttp://www.che.vt.edu/Wilkes/electrospinning/electrspinning.htmlhttp://www.che.vt.edu/Wilkes/electrospinning/electrspinning.htmlhttp://www.che.vt.edu/Wilkes/electrospinning/electrspinning.htmlhttp://www1.uprh.edu/npinto/papers/1ncur2001.pdfhttp://www1.uprh.edu/npinto/papers/1ncur2001.pdfhttp://physicsworld.com/cws/event/17158http://nathan.instras.com/ResearchProposalDB/doc-118.pdfhttp://nathan.instras.com/ResearchProposalDB/doc-118.pdfhttp://nathan.instras.com/ResearchProposalDB/doc-118.pdfhttp://nathan.instras.com/ResearchProposalDB/doc-118.pdfhttp://nathan.instras.com/ResearchProposalDB/doc-118.pdfhttp://nathan.instras.com/ResearchProposalDB/doc-118.pdfhttp://physicsworld.com/cws/event/17158http://www1.uprh.edu/npinto/papers/1ncur2001.pdfhttp://www1.uprh.edu/npinto/papers/1ncur2001.pdfhttp://www.che.vt.edu/Wilkes/electrospinning/electrspinning.htmlhttp://www.che.vt.edu/Wilkes/electrospinning/electrspinning.htmlhttp://www.che.vt.edu/Wilkes/electrospinning/electrspinning.htmlhttp://www.thefutureisnear.org/student_research/current_research/documents/drugencapsulation/xq21.pdfhttp://www.thefutureisnear.org/student_research/current_research/documents/drugencapsulation/xq21.pdfhttp://www.thefutureisnear.org/student_research/current_research/documents/drugencapsulation/xq21.pdf