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Electrospun doped nanofibers and process of preparation thereof

a technology of electro-doped nanofibers and nanofibers, which is applied in the direction of non-metal conductors, conductors, transportation and packaging, etc., can solve the problems of difficult alignment and production of long fibers in the sub-micron and nanoscale diameters, large variability, and low strength and stiffness of es nanofibers, so as to improve mechanical properties

Inactive Publication Date: 2013-05-09
YEDA RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a type of fibers made from a polymer mixed with a salt, which have better strength and flexibility. These fibers can be used to make things like ropes, cables, and non-woven cloth. The added salt makes the fibers easier to produce and work with.

Problems solved by technology

Still, aligning and producing long fibers in the sub-micron and nanoscale diameters is challenging.
ES nanofibers are known to exhibit lower strength and stiffness, and larger variability, compared to their macroscopic (bulk) counterparts.

Method used

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  • Electrospun doped nanofibers and process of preparation thereof
  • Electrospun doped nanofibers and process of preparation thereof
  • Electrospun doped nanofibers and process of preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of ES Nanofibers

[0065]a. Preparation of the Solution

[0066]A solution consisting of 2 mg NaCl powder (Sodium Chloride GR, MerckKGaA) added to 10 ml dimethylformamide (DMF, Baker) was prepared by sonicating for half an hour to get a clear mixture. This was followed by the addition of 800 mg PMMA (Aldrich), stirred overnight at 70° C., resulting in an 80 mg / ml PMMA solution, with a 0.25% by weight NaCl concentration.

b. Fiber Spinning

[0067]ES nanofibers were prepared using the solution described herein above (Example 1, item (a)) according to the procedure described in X. M. Sui and H. D. Wagner, Nano Lett. 9, 1423-1426 (2009); X. M. Sui, S. Giordani, M. Prato, and H. D. Wagner, Appl. Phys. Lett. 95, 233113 (2009); L. Q. Liu, D. Tasis, M. Prato, and H. D. Wagner, Adv. Mater. 19, 1228-1233 (2007); which are hereby incorporated by reference. Briefly, a high voltage (electrical field strength: 66 kV / m) was applied (Glassman High Voltage Inc.) through a steel clamp mount on a 27...

example 2

Preparation of Films by Casting and Evaporation

[0070]PMMA films were also prepared for comparison, as bulk counterpart. A solution identical to the one used for the ES fibers (see Example 1, item (a)-hereinabove) was cast in an aluminum dish, then stored in a vacuum oven at 100° C. for 48 hours to let the DMF solvent evaporate. The resulting film was then cut into 11×3×0.07 mm3 rectangular stripes using parallel razor blades mounted on a micro-manipulator.

example 3

Tensile Tests of ES-Fibers

[0071]Tensile testing of the ES fibers, the ropes, and the bulk films was carried out with a home-built nano-tensile tester, a home-built micro-tensile tester, and a Minimat-2000 (Rheometric Scientific), respectively. The fibers were cut at a spot close to the edge of the gap (above the foil) so that each of them could easily be picked up by means of a glue droplet previously deposited on the conical end of an AFM tip. Such pick up was performed by a nano-manipulator (Kleindiek Nanotechnik, NanoControl NC-2-3). The liquid epoxy glue solidified usually within 40 min, following which the nanofiber-tip complex could easily be removed from the Aluminum foil. Subsequently, the opposite (free) end of the nanofiber was plunged into a large drop of liquid epoxy glue spread on a stub attached to the manipulator. The epoxy drop solidified within 40 minutes, as before. A tensile test could then be performed by inducing tension in the fiber by pulling the ES fiber with...

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Abstract

This invention is directed to nanofibers doped with an alkali salt having improved tensile properties, and process of preparation thereof.

Description

FIELD OF THE INVENTION[0001]This invention is directed to nanofibers doped with an alkali salt having improved tensile properties, and process of preparation thereof.BACKGROUND OF THE INVENTION[0002]Nanofibers are known for their wide range of applications in the fields of tissue engineering, textiles, filter material sensors and bioengineering applications, such as tissue regeneration, biosensors, recognition and filtration of viruses and drug molecules.[0003]Well-established techniques for producing fibers for textiles having diameters in the micron length scales and with lengths in excess of meters are well known, including spun-bonding, meltblowing, dryspinning, conjugate spinning and CO2 laser thinning produce fibers. Still, aligning and producing long fibers in the sub-micron and nanoscale diameters is challenging.[0004]Electrospining (ES) is an efficient technique to produce nanometer size fibers for applications in textile, filtration, sensing, drug delivery and tissue engin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D01F1/10D01D5/00D02G3/04
CPCD01D5/0015D01F1/10Y10T428/2967D02G3/04D01D5/0007
Inventor WAGNER, DANIEL H.WIESEL, ERICASUI, XIAOMENG
Owner YEDA RES & DEV CO LTD