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Electrospinning

Patent Abstracts

*1/9/2013

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Patent Abstracts

6. 8,342,831 
Controlled electrospinning of fibers   

Barinov and Levon, New York, developed an electrospinning apparatus for spinning polymer fibers from a fluid delivered by a jet supply device to several collectors in electrical communication with an electrode of the jet supply device.  These collectors are insulated from each other.  At least one collector contains a stretcher.  A controller controls sequence and time duration at which collectors are in electrical communication with the electrode of the jet supply device creating a non-woven polymer fabric or weaving polymer fibers into a fabric. The electrospinning apparatus contains a rotator adapted to rotate the stretcher. (RDC 1/9/2013)

5. 8,282,873 
Controlled electrospinning of fibers
 
Barinov and Levon, New York, developed controlled electrospinning of polymer fibers.  The methods include spinning a polymer fiber from a polymer fluid in the presence of an electric field established between collectors and a jet supply device controlling the dispersion characteristics of the fluid by applying a magnetic field created by at least one magnet located after the point of jet formation.  At least one magnet, located between the jet supply device and at least one collector, creates a magnetic field substantially transverse or substantially collinear to an electrospinning jet stream. The magnetic field changes direction of travel of the electrospinning jet stream. (RDC 10/15/2012)

4. 8,242,073 
Biodegradable and bioabsorbable biomaterials and keratin fibrous articles for medical applications
 
Li et al of The Hong Kong Polytechnic University, China, produced biodegradable and/or bioabsorbable biomaterials and keratin nonwoven fibrous articles by electrospinning fibers from a blend of biomaterials and keratin dissolved in organic solvents includes generating a high voltage electric field between oppositely charged biomaterials and keratin fluid in a syringe with a capillary tip and a metallic collection roller and causing a jet to flow to the roller as solvent evaporates and collecting fibrous membranes or scaffolds on the roller. Keratin increased the cell affinity of biomaterial scaffolds which have potential medical applications. (RDC 8/29/2012)

3. 8,241,537 
Method for manufacturing polymeric fibrils
 
Chang et al of Taiwan Textile Research Institute, Taiwan, developed an electrospinning apparatus with a rotary nozzle mechanism that moves simultaneously along a non-linear track for forming polymeric fibrils, so that the polymeric fibrils can be piled to form a uniform web on a receiving carrier from any receiving angle. (RDC 8/16/2012)

2. 8,231,822 
Method for spinning a liquid matrix for production of nanofibres through electrostatic spinning of liquid matrix
 
Petras et al of Elmarco, S.R.O., Czech Republic, developed a method for electrospinning spinning using a moving cord or wire.  The fibers are formed on this wire. Stability and constancy in position of active spinning zone of the cord during spinning process secures evenness in creation of nanofibres in a narrow interval of diameters, which considerably increases the quality of produced nanofibrous layers. General increasing in quality of the spinning process is achieved through manner of transportation of the liquid matrix to the active spinning zone, which secures spinning of always fresh quality liquid matrix and optimises the spinning process. It is not necessary to interrupt the spinning process for the purpose to clean the spinning electrodes from the liquid matrix devalued through the previous cycles of spinning and/or by effect of surrounding atmosphere which got stuck on the active spinning zones of the spinning members of the spinning electrode. (RDC 8/7/2012)

1. 8,178,030 
Electrospinning of PTFE with high viscosity materials
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Anneaux, Ballard and Garner of  Zeus Industrial Products, South Carolina, developed an improved process for forming a PTFE mat.  The process includes providing a dispersion with PTFE, a fiberizing polymer and a solvent wherein said dispersion has a viscosity of at least 50,000 cP.  An apparatus is provided which comprises a charge source and a target a distance from the charge source.  A voltage source is provided which creates a first charge at the charge source and an opposing charge at the target.  The dispersion is electrostatically charged by contact with the charge source.  The electrostatically charged dispersion is collected on the target to form a mat precursor which is heated to remove the solvent and the fiberizing polymer thereby forming the PTFE mat. A preferred fiberizing polymer is polyethyleneoxide (PEO) with a molecular weight of about 300,000. (RDC 5/24/2012)

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Roger D. Corneliussen
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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 5/25/2012.