Featured Research

from universities, journals, and other organizations

Researchers Create Glass Within A Glass; Mobile Silver Ions Appear Key To New Materials

Date:
May 2, 2001
Source:
University Of Cincinnati
Summary:
University of Cincinnati researchers have turned silver iodide into glass - a feat few scientists would have predicted based on research dating back to 1910.

University of Cincinnati researchers have turned silver iodide into glass - a feat few scientists would have predicted based on research dating back to 1910.

Related Articles


In a paper published in the April 26 issue of the journal Nature, Professor Punit Boolchand and Research Associate Wayne Bresser demonstrate that the glass transition will occur at precisely the same temperature whenever silver iodide is placed in what they call a "special matrix" or "base glass."

"If you try to make silver iodide into a glass by going through the traditional melt/quench steps, you can't make it glassy. The solution was to put it in a matrix."

The UC researchers looked for special matrices that form glasses, but which are also "self-organized" which makes them relatively stress-free in molecular terms. "When we added silver iodide to these 'special matrices, we succeeded in making silver iodide glassy."

The new materials are so light sensitive and prone to tarnish that they must be made "fresh" periodically and stored in the dark. In a bit of economical genius, the reseachers discovered an empty Ovaltine jar works perfectly to perfect their samples on the 6th floor of the UC Engineering Research Center labs.

It took something much more complex and expensive to run the actual measurements. Boolchand uses a state-of-the-art Modulated Differential Scanning Calorimeter (MDSC) to precisely monitor when materials change phase. This equipment was important in measuring the key glass transition temperature. No matter which base glass or special matrix was used, the glass transition temperature remained the same: 75 degrees Celsius.

Boolchand says the unusual glass forming properties of silver iodide relate to the mobility of silver ions and the ability of silver iodide to serve as a solid electrolyte. "This was actually discovered by a German scientist back in 1910:

Today, it means the new materials not only demonstrate an "unprecedented increase in conductivity," they have potential applications in batteries for pacemakers and other high-demand devices, new sensors, and displays."

The University of Cincinnati researchers also saw the unusual glass transition in silver selenide, and they are now extending their work on both the experimental and theoretical fronts. Their calculations can predict where the glass transition will occur, and they are now testing new combinations of solid electrolytes and base glasses, including glasses which normally are insulators rather than semiconductors.

So, far they recognize three distinct classes of glasses:

* Class one where there is complete segregation of silver iodide into a distinct glass.

* Class two where some silver additive mixes with the base glass, while the remainder becomes glassy a different transition temperature

* Class three where all the silver additive mixes with the base glass, and only one glass transition temperature is seen.

The research is funded by the National Science Foundation.


Story Source:

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


Cite This Page:

University Of Cincinnati. "Researchers Create Glass Within A Glass; Mobile Silver Ions Appear Key To New Materials." ScienceDaily. ScienceDaily, 2 May 2001. <www.sciencedaily.com/releases/2001/04/010427071941.htm>.
University Of Cincinnati. (2001, May 2). Researchers Create Glass Within A Glass; Mobile Silver Ions Appear Key To New Materials. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2001/04/010427071941.htm
University Of Cincinnati. "Researchers Create Glass Within A Glass; Mobile Silver Ions Appear Key To New Materials." ScienceDaily. www.sciencedaily.com/releases/2001/04/010427071941.htm (accessed October 25, 2014).

Share This



More Matter & Energy News

Saturday, October 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
Real-Life Transformer Robot Walks, Then Folds Into a Car

Real-Life Transformer Robot Walks, Then Folds Into a Car

Buzz60 (Oct. 24, 2014) Brave Robotics and Asratec teamed with original Transformers toy company Tomy to create a functional 5-foot-tall humanoid robot that can march and fold itself into a 3-foot-long sports car. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Police Testing New Gunfire Tracking Technology

Police Testing New Gunfire Tracking Technology

AP (Oct. 24, 2014) A California-based startup has designed new law enforcement technology that aims to automatically alert dispatch when an officer's gun is unholstered and fired. Two law enforcement agencies are currently testing the technology. (Oct. 24) Video provided by AP
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