Featured Research

from universities, journals, and other organizations

When Is A Liquid Not Like A Liquid? Secrets Of Nanoparticle Haloing Unveiled

Date:
June 6, 2008
Source:
DOE/Argonne National Laboratory
Summary:
A glass of milk, a gallon of paint and a bottle of salad dressing all look to the naked eye like liquids. But when viewed under a microscope these everyday liquids, called "colloids," actually contain small globules or particles that stay suspended in solution. A new colloidal stabilization method may give scientists a new way to control the stability of some colloidal suspensions.

A glass of milk, a gallon of paint, and a bottle of salad dressing all look to the naked eye like liquids. But when viewed under a microscope these everyday liquids, called "colloids," actually contain small globules or particles that stay suspended in solution.

Related Articles


Colloids require a delicate balance of opposing forces for them to be stable: attractive forces must be matched by repulsive ones. A new colloidal stabilization method characterized by scientists at the U.S. Department of Energy's (DOE) Argonne National Laboratory may give scientists a new way to control the stability of some colloidal suspensions.

In this approach, known as nanoparticle haloing, highly charged nanoparticles and negligibly charged colloidal microspheres are mixed together in solution. The nanoparticles self-organize around the microspheres to form a halo-like structure that stabilizes the solution. This new pathway to produce materials would not be possible through traditional routes.

The structure of the halo -- the key to understanding this kind of stable colloid -- has remained a mystery because the nanoparticles that form it are more than 100 times smaller than the microspheres that they surround.

By using x-rays produced by Argonne's Advanced Photon Source (APS), Argonne scientists, in collaboration with researchers from the University of Illinois at Urbana-Champaign, were able to finally discover the structure of the nanoparticle halo.

The researchers used the ultra-small-angle x-ray scattering (USAXS) instrument at the APS to discover that nanoparticles form a loosely organized layer a small distance from the surface of the microspheres. This discovery suggests a weak attraction between nanoparticle and microsphere, corroborating earlier theoretical predictions that the halo can form only in such an environment.

"Because we have established a methodology to determine the structure of nanoparticle halo, it opens a window to the systematic study of the entire nanoparticle-microsphere phase diagram for this type of novel colloidal stabilization mechanism," said Argonne's Fan Zhang, a coauthor on the Langmuir paper.


Story Source:

The above story is based on materials provided by DOE/Argonne National Laboratory. Note: Materials may be edited for content and length.


Cite This Page:

DOE/Argonne National Laboratory. "When Is A Liquid Not Like A Liquid? Secrets Of Nanoparticle Haloing Unveiled." ScienceDaily. ScienceDaily, 6 June 2008. <www.sciencedaily.com/releases/2008/06/080605130507.htm>.
DOE/Argonne National Laboratory. (2008, June 6). When Is A Liquid Not Like A Liquid? Secrets Of Nanoparticle Haloing Unveiled. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2008/06/080605130507.htm
DOE/Argonne National Laboratory. "When Is A Liquid Not Like A Liquid? Secrets Of Nanoparticle Haloing Unveiled." ScienceDaily. www.sciencedaily.com/releases/2008/06/080605130507.htm (accessed November 23, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, November 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

AFP (Nov. 21, 2014) Toyota presented its hydrogen fuel-cell compact car called "Mirai" to US consumers at the Los Angeles auto show. The car should go on sale in 2015 for around $60.000. It combines stored hydrogen with oxygen to generate its own power. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Google Announces Improvements To Balloon-Borne Wi-Fi Project

Google Announces Improvements To Balloon-Borne Wi-Fi Project

Newsy (Nov. 21, 2014) In a blog post, Google said its balloons have traveled 3 million kilometers since the start of Project Loon. Video provided by Newsy
Powered by NewsLook.com
Raw: Paralyzed Marine Walks With Robotic Braces

Raw: Paralyzed Marine Walks With Robotic Braces

AP (Nov. 21, 2014) Marine Corps officials say a special operations officer left paralyzed by a sniper's bullet in Afghanistan walked using robotic leg braces in a ceremony to award him a Bronze Star. (Nov. 21) Video provided by AP
Powered by NewsLook.com
British 'Bio-Bus' Is Powered By Human Waste

British 'Bio-Bus' Is Powered By Human Waste

Buzz60 (Nov. 21, 2014) British company GENeco debuted what its calling the Bio-Bus, a bus fueled entirely by biomethane gas produced from food scraps and sewage. Jen Markham explains. Video provided by Buzz60
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