Featured Research

from universities, journals, and other organizations

Nanoparticles "Tailor" Complex Fluids For Photonics, Ceramics Applications

Date:
August 3, 2001
Source:
University Of Illinois At Urbana-Champaign
Summary:
Researchers at the University of Illinois have discovered a fundamentally new approach for tailoring the stability of colloidal suspensions.

CHAMPAIGN, Ill. — Researchers at the University of Illinois have discovered a fundamentally new approach for tailoring the stability of colloidal suspensions.

Colloidal suspensions are complex fluids utilized in numerous applications ranging from advanced materials to drug delivery. Controlling the stability of these fluids can influence such characteristics as flow behavior, structure and mechanical response, and may result in materials with improved optical and electrical properties.

As reported in the July 31 issue of the Proceedings of the National Academy of Sciences, Jennifer Lewis and her colleagues have devised a process that they call nanoparticle haloing. This self-organizing process imparts stability to otherwise attractive colloidal microspheres by decorating regions near their surface with highly charged nanoparticles.

"Using this nanoparticle haloing approach, we can control the phase behavior and structure of materials assembled from colloidal systems," said Lewis, a UI professor of materials science and engineering and of chemical engineering. "Our approach complements traditional stabilization techniques, such as electrostatic stabilization, by allowing systems of negligible charge or high ionic strength to be stabilized."

Tailoring the interactions between particles allows the researchers to engineer the desired degree of colloidal stability into the mixture.

"That means we can create designer colloidal fluids, gels and even crystals," Lewis said. "Our ability to control colloidal forces and phase behavior depends not only on the charge of the nanoparticles, but also on their size. Through nanoparticle engineering, we can assemble structures with properties that would not be possible through traditional stabilization routes."

For example, Lewis has teamed up with co-author Paul Braun, a UI professor of materials science and engineering, to explore the use of these nanoparticle-stabilized colloidal microsphere mixtures in assembling robust periodic templates for photonic band gap materials. The researchers recently were awarded funding by the National Science Foundation to pursue such efforts.

Lewis and her students are also studying the structure and flow behavior of colloidal fluids and gels assembled from these microsphere-nanoparticle mixtures. By compositionally modulating interparticle forces, the researchers can produce systems whose properties vary dramatically. Such studies provide the foundation of ongoing efforts in the area of colloidal processing of electrical ceramics.

In addition to Lewis and Braun, the research team included UI doctoral students Valeria Tohver and James Smay, and Carnegie Mellon University graduate student Alan Braem. The National Aeronautics and Space Administration Microgravity Research Program funded the work.


Story Source:

The above story is based on materials provided by University Of Illinois At Urbana-Champaign. Note: Materials may be edited for content and length.


Cite This Page:

University Of Illinois At Urbana-Champaign. "Nanoparticles "Tailor" Complex Fluids For Photonics, Ceramics Applications." ScienceDaily. ScienceDaily, 3 August 2001. <www.sciencedaily.com/releases/2001/08/010802081132.htm>.
University Of Illinois At Urbana-Champaign. (2001, August 3). Nanoparticles "Tailor" Complex Fluids For Photonics, Ceramics Applications. ScienceDaily. Retrieved August 31, 2014 from www.sciencedaily.com/releases/2001/08/010802081132.htm
University Of Illinois At Urbana-Champaign. "Nanoparticles "Tailor" Complex Fluids For Photonics, Ceramics Applications." ScienceDaily. www.sciencedaily.com/releases/2001/08/010802081132.htm (accessed August 31, 2014).

Share This




More Matter & Energy News

Sunday, August 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Australian Airlines Relax Phone Ban Too

Australian Airlines Relax Phone Ban Too

Reuters - Business Video Online (Aug. 26, 2014) Qantas and Virgin say passengers can use their smartphones and tablets throughout flights after a regulator relaxed a ban on electronic devices during take-off and landing. As Hayley Platt reports the move comes as the two domestic rivals are expected to post annual net losses later this week. Video provided by Reuters
Powered by NewsLook.com
Hurricane Marie Brings Big Waves to California Coast

Hurricane Marie Brings Big Waves to California Coast

Reuters - US Online Video (Aug. 26, 2014) Huge waves generated by Hurricane Marie hit the Southern California coast. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Chinese Researchers Might Be Creating Supersonic Submarine

Chinese Researchers Might Be Creating Supersonic Submarine

Newsy (Aug. 26, 2014) Chinese researchers have expanded on Cold War-era tech and are closer to building a submarine that could reach the speed of sound. Video provided by Newsy
Powered by NewsLook.com
Breakingviews: India Coal Strained by Supreme Court Ruling

Breakingviews: India Coal Strained by Supreme Court Ruling

Reuters - Business Video Online (Aug. 26, 2014) An acute coal shortage is likely to be aggravated as India's supreme court declared government coal allocations illegal, says Breakingviews' Peter Thal Larsen. Video provided by Reuters
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:
from the past week

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