Featured Research

from universities, journals, and other organizations

Silk-based Optical Waveguides Meet Biomedical Needs

Date:
September 27, 2009
Source:
Tufts University
Summary:
Researchers demonstrate a new way to make silk-based optical waveguides that are biocompatible, biodegradable and readily functionalized with active molecules. This opens up opportunities in biologically based modulation and sensing and ability to integrate light delivery in living tissue.

There is a growing need for biocompatible photonic components for biomedical applications – from in vivo glucose monitoring to detecting harmful viruses or the telltale markers of Alzheimer's. Optical waveguides are of particular interest because of their ability to manipulate and transport light in a controlled manner in a variety of configurations.

In an article featured on the cover of Advanced Materials, researchers at Tufts University and the University of Illinois at Urbana-Champaign demonstrated a new method for fabricating silk-based optical waveguides that are biocompatible, biodegradable and can be readily functionalized with active molecules. The Tufts-UIUC team successfully demonstrated light guiding through this new class of waveguides created by direct ink writing using Bombyx mori silk fibroin inks.

"In many biomedical applications, waveguides must interface directly with living cells and tissues, requiring the waveguide constituent to be biocompatible. Biodegradability is also desirable," said Tufts' Fiorenzo Omenetto, professor of biomedical engineering in the School of Engineering and professor of physics in the School of Arts and Sciences. "The use of a biocompatible, biodegradable polymer like silk to guide light opens up new opportunities in biologically based modulation and sensing along with an opportunity to integrate light delivery within living tissue."

The research capitalized on Tufts' knowledge of silk-based biopolymers and biophotonics and the expertise of UIUC Professor Jennifer A. Lewis and graduate student Sara T. Parker in direct-write assembly to create complex planar and three-dimensional structures.

"Silks are well suited for this purpose, because they are the strongest and toughest natural fibers known," said David Kaplan, professor and chair of the biomedical engineering department at Tufts' School of Engineering. "Furthermore, the ability to biochemically functionalize or incorporate dopants into the silk-fibroin ink allows for unconventional photoactivation of the waveguides, which is not easily achieved otherwise."

Direct ink writing is a simple, inexpensive technique that does not require harsh processing steps. A computer-controlled three-axis translation stage precisely moves a syringe barrel that houses a viscous ink, which is extruded from a fine deposition nozzle under pressure. The ink flows rapidly through the nozzle, and equally rapidly solidifies upon exiting to retain a filamentary shape while maintaining sufficient optical clarity to guide light.

Research funding was provided by a National Science Foundation Graduate Research Fellowship, the Defense Advanced Research Projects Agency, the Air Force Office of Scientific Research, and the US Department of Energy.


Story Source:

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


Journal Reference:

  1. Sara T. Parker, Peter Domachuk, Jason Amsden, Jason Bressner, Jennifer A. Lewis, David L. Kaplan, and Fiorenzo G. Omenetto. Silk Fibroin Waveguides: Biocompatible Silk Printed Optical Waveguides (Adv. Mater. 23/2009). Advanced Materials, 2009; 21 (23): NA DOI: 10.1002/adma.200990086

Cite This Page:

Tufts University. "Silk-based Optical Waveguides Meet Biomedical Needs." ScienceDaily. ScienceDaily, 27 September 2009. <www.sciencedaily.com/releases/2009/08/090831213005.htm>.
Tufts University. (2009, September 27). Silk-based Optical Waveguides Meet Biomedical Needs. ScienceDaily. Retrieved October 1, 2014 from www.sciencedaily.com/releases/2009/08/090831213005.htm
Tufts University. "Silk-based Optical Waveguides Meet Biomedical Needs." ScienceDaily. www.sciencedaily.com/releases/2009/08/090831213005.htm (accessed October 1, 2014).

Share This



More Matter & Energy News

Wednesday, October 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Japan Looks To Faster Future As Bullet Train Turns 50

Japan Looks To Faster Future As Bullet Train Turns 50

Newsy (Oct. 1, 2014) Japan's bullet train turns 50 Wednesday. Here's a look at how it's changed over half a century — and the changes it's inspired globally. Video provided by Newsy
Powered by NewsLook.com
US Police Put Body Cameras to the Test

US Police Put Body Cameras to the Test

AFP (Oct. 1, 2014) Police body cameras are gradually being rolled out across the US, with interest surging after the fatal police shooting in August of an unarmed black teenager. Duration: 02:18 Video provided by AFP
Powered by NewsLook.com
Raw: Japan Celebrates 'bullet Train' Anniversary

Raw: Japan Celebrates 'bullet Train' Anniversary

AP (Oct. 1, 2014) A ceremony marking 50 years since Japan launched its Shinkansen bullet train was held on Wednesday in Tokyo. The latest model can travel from Tokyo to Osaka, a distance of 319 miles, in two hours and 25 minutes. (Oct. 1) Video provided by AP
Powered by NewsLook.com
Robotic Hair Restoration

Robotic Hair Restoration

Ivanhoe (Oct. 1, 2014) A new robotic procedure is changing the way we transplant hair. The ARTAS robot leaves no linear scarring and provides more natural results. Video provided by Ivanhoe
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