ELECTROSPRAY/ELECTROSPINNING APPARATUS AND METHOD

• US 20110031638A1
• Filed: 06/29/2010
• Published: 02/10/2011
• Est. Priority Date: 04/08/2004
• Status: Active Grant

• Current Assignee: Research Triangle Institute
• Original Assignee: Research Triangle Institute
• Inventors: ANDRADY, Anthony L., Ensor, David S.
• Granted Patent: US 8,088,324 B2
• Time in Patent Office: Days
• US Class Current: 264/10
• CPC Class Codes: D01D 5/0069 characterised by the spinning section, e.g. capillary tube, protrusion or pin
• CPC Class Codes: D01D 5/0092 characterised by the electrical field, e.g. combined with a magnetic fields, using biased or alternating fields

Abstract

Apparatus and method for producing fibrous materials in which the apparatus includes an enclosure having an inlet configured to receive a substance from which the fibrous materials are to be composed, a common electrode disposed in the enclosure, and plural extrusion elements provided in a wall of the enclosure opposite the common electrode so as to define between the plural extrusion elements and the common electrode a space in communication with the inlet to receive the substance in the space. In the method, a substance from which the fibrous materials are to be composed is fed to the enclosure having the plural extrusion elements, a common electric field is applied to the extrusion elements in a direction in which the substance is to be extruded, the substance is extruded through the extrusion elements to tips of the extrusion elements, and the substance is electrosprayed from the tips to form the fibrous materials.

Claims

1. A method for producing fibrous materials, comprising:

feeding a substance from which the fibrous materials are to be composed to an enclosure having at least one extrusion element, said at least one extrusion element including at least one frit segment entirely covering an opening in the extrusion element;

applying a common electric field to said extrusion element in a direction in which said substance is to be extruded;

extruding said substance through said extrusion element including said at least one frit segment; and

electrospraying said substance at the tips of said plural extrusion elements to form said fibrous materials.

2. The method of claim 1, wherein said electrospraying comprises:

electrospinning said extruded substance from said at least one extrusion element to form fibers.

3. The method of claim 1, wherein said electrospraying comprises:

electrospinning said extruded substance from said at least one extrusion element to form nanofibers.

4. The method of claim 1, wherein said electrospraying comprises:

electrospinning said fibrous materials in said common electric field having a strength of 2,000-400,000 V/m.

5. The method of claim 1, further comprising:

collecting said fibrous materials on a collector.

6. The method of claim 5, wherein said collecting comprises:

collecting fibers of said extruded substance.

7. The method of claim 1, wherein the electrospraying comprises:

electrospinning polymeric fibers.

8. The method of claim 7, further comprising:

annealing said polymeric fibers to form carbon fibers.

9. The method of claim 1, wherein the electrospraying comprises:

electrospinning polymeric nanofibers.

10. The method of claim 9, further comprising:

annealing said polymeric nanofibers to form carbon nanofibers.