Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > New Technique Scales Up Nanofiber Production

Abstract:
"Edge electrospinning for high throughput production of quality nanofibers"

Authors: N M Thoppey, J R Bochinski, L I Clarke and R E Gorga, North Carolina State University
Published: July 29, 2011, in Nanotechnology

A novel, simple geometry for high throughput electrospinning from a bowl edge is presented that utilizes a vessel filled with a polymer solution and a concentric cylindrical collector. Successful fiber formation is presented for two different polymer systems with differing solution viscosity and solvent volatility. The process of jet initiation, resultant fiber morphology and fiber production rate are discussed for this unconfined feed approach. Under high voltage initiation, the jets spontaneously form directly on the fluid surface and rearrange along the circumference of the bowl to provide approximately equal spacing between spinning sites. Nanofibers currently produced from bowl electrospinning are identical in quality to those fabricated by traditional needle electrospinning (TNE) with a demonstrated ~40 times increase in the production rate for a single batch of solution due primarily to the presence of many simultaneous jets. In the bowl electrospinning geometry, the electric field pattern and subsequent effective feed rate are very similar to those parameters found under optimized TNE experiments. Consequently, the electrospinning process per jet is directly analogous to that in TNE and thereby results in the same quality of nanofibers.

New Technique Scales Up Nanofiber Production

Raleigh, NC | Posted on August 10th, 2011

A new spin on an old technology will give scientists and manufacturers the ability to significantly increase their production of nanofibers, according to researchers at North Carolina State University.

Collections of nanofibers, because they are porous and lightweight, are useful in applications ranging from water filtration to tissue regeneration to energy storage. But although nanofibers are relatively inexpensive to produce, the current method of production - needle electrospinning - is time-intensive.

In electrospinning, a liquid-polymer solution is passed through a hypodermic needle held at high voltage. The needle transfers electric charge, which transforms the solution into a jet of charged liquid that "spins" into a nanofiber as it exits the needle. Unfortunately, this method of production does not lend itself to large-scale manufacturing processes.

NC State physicists Laura Clarke and Jason Bochinski, textile engineer Russell Gorga and graduate student Nagarajan Thoppey found a particularly simple technique that scales up nanofiber production and provides a close connection to the needle electrospinning method. In a study recently published in the journal Nanotechnology, they demonstrated "bowl electrospinning." In place of a hypodermic needle, the researchers filled a bowl with the polymer fluid and applied a short burst of very high voltage to the liquid's surface, which caused multiple jets to form and "spin" nanofibers onto a collector placed around the outside of the bowl.

According to Bochinski, the experiment gave them a 40-fold increase in nanofiber production, and demonstrated the potential for further increases. It also led to one question that they hope to answer in the near future:

"One of our next steps will be studying the limitations of the bowl apparatus we used - for instance, why was the increase only 40-fold and not 40,000-fold - and how that relates to the geometry of the arrangement and the fluid's properties," Bochinski says.

The work was funded by the National Science Foundation and NC State's Faculty Research and Professional Development Fund. The Department of Physics is part of NC State's College of Physical and Mathematical Sciences. The Department of Textile Engineering, Chemistry and Science is part of NC State's College of Textiles.

####

For more information, please click here

Contacts:
Tracey Peake
News Services
919.515.6142

Copyright © North Carolina State University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Harris & Harris Group to Host Conference Call on Second-Quarter 2014 Financial Results on August 15, 2014 July 23rd, 2014

UCF Nanotech Spinout Developing Revolutionary Battery Technology: Power the Next Generation of Electronics with Carbon July 23rd, 2014

Deadline Announced for Registration in 7th Int'l Nanotechnology Festival in Iran July 23rd, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Materials/Metamaterials

Penn Study: Understanding Graphene’s Electrical Properties on an Atomic Level July 22nd, 2014

NUS scientists use low cost technique to improve properties and functions of nanomaterials: By 'drawing' micropatterns on nanomaterials using a focused laser beam, scientists could modify properties of nanomaterials for effective applications in photonic and optoelectric applicat July 22nd, 2014

Steam from the sun: New spongelike structure converts solar energy into steam July 21st, 2014

Carbyne morphs when stretched: Rice University calculations show carbon-atom chain would go metal to semiconductor July 21st, 2014

Announcements

Harris & Harris Group to Host Conference Call on Second-Quarter 2014 Financial Results on August 15, 2014 July 23rd, 2014

UCF Nanotech Spinout Developing Revolutionary Battery Technology: Power the Next Generation of Electronics with Carbon July 23rd, 2014

Deadline Announced for Registration in 7th Int'l Nanotechnology Festival in Iran July 23rd, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE