Featured Research

from universities, journals, and other organizations

Step closer to composite-based electronics

Date:
November 25, 2013
Source:
Springer Science+Business Media
Summary:
A new study demonstrates that electrical resistivity obeys a staircase-like dependence on the conducting particle concentration in composite materials.

A new study demonstrates that electrical resistivity obeys a staircase-like dependence on the conducting particle concentration in composite materials

Composite materials are of increasing interest to physicists. Typically, they are made of electrically conducting elements -- such as spherical metallic or elongated carbon particles -- embedded in an insulating glass or a polymer matrix. Their controllable electrical resistivity, combined with their light and flexible properties, makes them suited for applications in flexible electronics. Now, a theoretical model, confirmed experimentally, elucidates how electrical resistivity varies with the concentration of the particles in these composite materials. These findings, by Isaac Balberg and colleagues from the Hebrew University in Jerusalem, have been published in EPJB..

To understand the dependence of resistivity on the concentration of the electrically conducting particles, the authors apply percolation theory. It provides a map for the number and size of clusters of adjacent particles as the concentration of particles increases. In this study, the authors note that the resistances involved in the electrical conduction can have a given discrete series of values unlike a single one or a continuous distribution found in many previous works.

Balberg and colleagues made the theoretical prediction -- and proved experimentally using granular metal and carbon-black composites -- that the dependence of the electrical resistance on the conducting particle concentration is manifested by a staircase. This was particularly obvious in nanometric scale systems, in which there is a well-defined discrete series of distances between a particle and its neighbours. Each stair exhibits a universal behaviour -- independent of the details of the system -- predicted by percolation theory. The electrical resistivity associated with subsequent stairs decreases as the concentration of the conducting particles increases.

This work was also able to shed light on many previously unexplained data related to characteristics of various types of composites, such as those containing carbon nanotubes or graphene.


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. I. Balberg, D. Azulay, Y. Goldstein, J. Jedrzejewski, G. Ravid, E. Savir. The percolation staircase model and its manifestation in composite materials. The European Physical Journal B, 2013; 86 (10) DOI: 10.1140/epjb/e2013-40200-7

Cite This Page:

Springer Science+Business Media. "Step closer to composite-based electronics." ScienceDaily. ScienceDaily, 25 November 2013. <www.sciencedaily.com/releases/2013/11/131125121403.htm>.
Springer Science+Business Media. (2013, November 25). Step closer to composite-based electronics. ScienceDaily. Retrieved August 21, 2014 from www.sciencedaily.com/releases/2013/11/131125121403.htm
Springer Science+Business Media. "Step closer to composite-based electronics." ScienceDaily. www.sciencedaily.com/releases/2013/11/131125121403.htm (accessed August 21, 2014).

Share This




More Matter & Energy News

Thursday, August 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Flower Power! Dandelions Make Car Tires?

Flower Power! Dandelions Make Car Tires?

Reuters - Business Video Online (Aug. 20, 2014) Forget rolling on rubber, could car drivers soon be traveling on tires made from dandelions? Teams of scientists are racing to breed a type of the yellow flower whose taproot has a milky fluid with tire-grade rubber particles in it. As Joanna Partridge reports, global tire makers are investing millions in research into a new tire source. Video provided by Reuters
Powered by NewsLook.com
Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Newsy (Aug. 19, 2014) Scientists have developed a new device that mimics the way octopuses blend in with their surroundings to hide from dangerous predators. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
Powered by NewsLook.com
Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

AFP (Aug. 19, 2014) A solar cell that resembles a flower is offering a new take on green energy in Japan, where one scientist is searching for renewables that look good. Duration: 01:29 Video provided by AFP
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