Featured Research

from universities, journals, and other organizations

Too cool to follow the law: Viscous materials do not follow standard laws below a sub-melting point threshold

Date:
August 1, 2012
Source:
Springer Science+Business Media
Summary:
So-called glass-formers are a class of highly viscous liquid materials that have the consistency of honey and turn into brittle glass once cooled to sufficiently low temperatures. Scientists have elucidated the behavior of these materials as they are on the verge of turning into glass. Although scientists do not yet thoroughly understand their behavior when approaching the glassy state, this new study, which relies on an additional type of dynamic measurements, clearly shows that they do not behave like more simple fluids, referred to as "activated" fluids.

So-called glass-formers are a class of highly viscous liquid materials that have the consistency of honey and turn into brittle glass once cooled to sufficiently low temperatures. Zhen Chen and his colleagues from Arizona State University, USA, have elucidated the behaviour of these materials as they are on the verge of turning into glass in an article about to be published in The European Physical Journal E.

Although scientists do not yet thoroughly understand their behaviour when approaching the glassy state, this new study, which relies on an additional type of dynamic measurements, clearly shows that they do not behave like more simple fluids, referred to as "activated" fluids. This is contrary to recent reports.

Typically, the dynamics of materials are described using a formula called the Arrhenius law, which is well known for chemical reaction rates. It states that a very simple law regulates how temperature affects characteristics such as viscosity and relaxation times -i.e., delay in returning to equilibrium after the material has been subjected to a perturbation.

The authors used a so-called "residuals" analysis to show that Arrhenius type dynamics is not a common behaviour at temperatures between a sub-melting point threshold, called the crossover temperature, which occurs at a dynamic transition point, and the glass transition temperature, where the liquid becomes a glassy solid.

Zhen Chen and co-authors came to this conclusion by analysing not only the material's viscosity but also more precise data on the dielectric relaxation time available within the same temperature range. This gave them a more exact account of relaxation dynamic properties in highly viscous materials.

The study revealed the need for greater precision in the viscosity data of glass-former materials to avoid masking its actual behaviour from data treatment and graphical representation.


Story Source:

The above story is based on materials provided by Springer Science+Business Media. Note: Materials may be edited for content and length.


Journal Reference:

  1. Z. Chen, C. A. Angell, R. Richert. On the dynamics of liquids in their viscous regime approaching the glass transition. The European Physical Journal E, 2012; 35 (7) DOI: 10.1140/epje/i2012-12065-2

Cite This Page:

Springer Science+Business Media. "Too cool to follow the law: Viscous materials do not follow standard laws below a sub-melting point threshold." ScienceDaily. ScienceDaily, 1 August 2012. <www.sciencedaily.com/releases/2012/08/120801093626.htm>.
Springer Science+Business Media. (2012, August 1). Too cool to follow the law: Viscous materials do not follow standard laws below a sub-melting point threshold. ScienceDaily. Retrieved August 1, 2014 from www.sciencedaily.com/releases/2012/08/120801093626.htm
Springer Science+Business Media. "Too cool to follow the law: Viscous materials do not follow standard laws below a sub-melting point threshold." ScienceDaily. www.sciencedaily.com/releases/2012/08/120801093626.htm (accessed August 1, 2014).

Share This




More Matter & Energy News

Friday, August 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Tesla, Panasonic Ink Deal To Make Huge Battery 'Gigafactory'

Tesla, Panasonic Ink Deal To Make Huge Battery 'Gigafactory'

Newsy (July 31, 2014) The deal will help build a massive battery factory that Tesla says will produce 500,000 lithium batteries by 2020. Video provided by Newsy
Powered by NewsLook.com
Britain Testing Driverless Cars on Roadways

Britain Testing Driverless Cars on Roadways

AP (July 30, 2014) British officials said on Wednesday that driverless cars will be tested on roads in as many as three cities in a trial program set to begin in January. Officials said the tests will last up to three years. (July 30) Video provided by AP
Powered by NewsLook.com
7 Ways to Use Toothpaste: Howdini Hacks

7 Ways to Use Toothpaste: Howdini Hacks

Howdini (July 30, 2014) Fresh breath and clean teeth are great, but have you ever thought, "my toothpaste could be doing more". Well, it can! Lots of things! Howdini has 7 new uses for this household staple. Video provided by Howdini
Powered by NewsLook.com
Smoked: 2015 Ducati Diavel Vs 2014 Chevy Corvette Stingray Drag Race

Smoked: 2015 Ducati Diavel Vs 2014 Chevy Corvette Stingray Drag Race

Cycle World (July 30, 2014) The Bonnier Motorcycle Group presents Smoked; a three part video series. In this episode the 2015 Ducati Diavel takes on the 2014 Chevy Corvette Stingray Video provided by Cycle World
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