Featured Research

from universities, journals, and other organizations

Fingerprints Provide Crucial Clue To New Nanofiber Fabrication Technique

Date:
January 26, 2006
Source:
Penn State
Summary:
Fingerprints are usually used to identify people but, this time, they gave Penn State chemical engineers the crucial clue needed to discover an easy, versatile new method for making nanofibers that have potential uses in advanced filtration as well as wound care, drug delivery, bioassays and other medical applications.

Snapshot of initial polymer fiber (15 min exposure to monomer and high humidity) growth on fingerprint at 30 C and relative humidity >95% (a) Low magnification view (b) Close-up view of the same (inset showing the top view of fiber). (Reproduced by permission of The Royal Society of Chemistry)

Fingerprints are usually used to identify people but, this time, they gave Penn State chemical engineers the crucial clue needed to discover an easy, versatile new method for making nanofibers that have potential uses in advanced filtration as well as wound care, drug delivery, bioassays and other medical applications.

The new technique is based on the way forensic scientists develop fingerprints from a crime scene and is easier and more versatile than either of the current methods, templates or electrospinning, used commercially to make nanofibers. The first nanofibers generated by the technique are made from the basic ingredient of Super Glue , cyanoacrylate, which is a biologically-compatible material already used in liquid sutures, spheres for drug delivery and in experimental cancer treatment. However, the researchers say that other materials, like cyanoacrylate, that form solid polymers when nudged by a catalyst could potentially also be used in the process.

Dr. Henry C. Foley, professor of chemical engineering who directed the project, says, "The new technique is so versatile that it allows us not only to make nano-scale fibers but also nano-sized flat sheets, spheres and even wrinkled sheets that look tortellini-like."

The researchers can also generate patterned surfaces and say that the process could conceivably be used in an ink jet printer.

The research is detailed in a paper, "Facile Catalytic Growth of Cyanoacrylate Nanofibers," published online today (Jan. 26) in the British journal, The Royal Society of Chemistry, Chemical Communications. The authors are Pratik J. Mankidy, doctoral candidate in chemical engineering; Ramakrishnan Rajagopalan, research associate at Penn State's Materials Research Laboratory, and Foley, who is also associate vice president for research at the University. The journal is available at: http://xlink.rsc.org/?DOI=B514600C

Foley explains that forensic scientists develop latent fingerprints via a process known as cyanoacrylate fuming. Fingerprints left on a surface are exposed to fumes of cyanoacrylate, which form a white polymer residue that makes the ridges of the fingerprint visible.

One of the researchers, Pratik Mankidy, had accidentally left his fingerprints on a piece of research equipment that had been secured with Super Glue and nanofibers appeared. Putting two and two together, the researchers set out to discover what constituents of fingerprints trigger the cyanoacrylate polymerization on the ridges of fingerprints. They made synthetic fingerprints from a mixture of a known polymer initiator, common table salt in water, and a non-initiator, linoleic acid, found on fingers. Then they exposed the fake prints to cyanoacrylate fuming. Sure enough, they got nanofibers similar to the ones Mankidy's fingerprints had generated accidentally. They also fumed cyanoacrylate on single initiators and found that sodium hydroxide, potassium hydroxide and potassium acetate produced tortellini-like films of the polymer. When ammonium hydroxide was fumed with cyanoacrylate, it produced nano-sized spheres.

The researchers note that the role played by the presence of the non-initiating components in the fingerprint mixture is not completely understood. They are continuing their experiments to understand the process more completely. A majority of the fibers produced by the new process have diameters in the 200-250-nanometer range and are hundreds of microns long. Typically, nanofibers that are currently commercially available are in this same range. Foley notes, "Our findings open up a whole new world of opportunity for control of nanoscale structures through chemistry via catalysis."

###

The research was supported by a grant from the National Science Foundation.


Story Source:

The above story is based on materials provided by Penn State. Note: Materials may be edited for content and length.


Cite This Page:

Penn State. "Fingerprints Provide Crucial Clue To New Nanofiber Fabrication Technique." ScienceDaily. ScienceDaily, 26 January 2006. <www.sciencedaily.com/releases/2006/01/060126192906.htm>.
Penn State. (2006, January 26). Fingerprints Provide Crucial Clue To New Nanofiber Fabrication Technique. ScienceDaily. Retrieved September 23, 2014 from www.sciencedaily.com/releases/2006/01/060126192906.htm
Penn State. "Fingerprints Provide Crucial Clue To New Nanofiber Fabrication Technique." ScienceDaily. www.sciencedaily.com/releases/2006/01/060126192906.htm (accessed September 23, 2014).

Share This



More Matter & Energy News

Tuesday, September 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Will Living Glue Be A Thing?

Will Living Glue Be A Thing?

Newsy (Sep. 23, 2014) — Using proteins derived from mussels, engineers at MIT have made a supersticky underwater adhesive. They're now looking to make "living glue." Video provided by Newsy
Powered by NewsLook.com
Company Copies Keys From Photos

Company Copies Keys From Photos

Newsy (Sep. 22, 2014) — A new company allows customers to make copies of keys by simply uploading a couple of photos. But could it also be great for thieves? Video provided by Newsy
Powered by NewsLook.com
The Hyped-Up Big Bang Discovery Has A Dust Problem

The Hyped-Up Big Bang Discovery Has A Dust Problem

Newsy (Sep. 22, 2014) — An analysis of new satellite data casts serious doubt on a previous study about the Big Bang that was once hailed as revolutionary. Video provided by Newsy
Powered by NewsLook.com
Rockefeller Oil Heirs Switching To Clean Energy

Rockefeller Oil Heirs Switching To Clean Energy

Newsy (Sep. 22, 2014) — The Rockefellers — heirs to an oil fortune that made the family name a symbol of American wealth — are switching from fossil fuels to clean energy. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins