Featured Research

from universities, journals, and other organizations

Enigmatic nematics: Law of hydrodynamics governing the way internally driven systems behave could explain their complex structure

Date:
October 29, 2012
Source:
Springer Science+Business Media
Summary:
Physicists use hydrodynamics to understand the physical mechanism responsible for changes in the long-range order of groups of particles. Researchers have now focused on ordered groups of elongated self-propelled particles. They have studied the breakdown of long-range order due to fluctuations that render them unstable and give rise to complex structures, in a new study.

Physicists use hydrodynamics to understand the physical mechanism responsible for changes in the long-range order of groups of particles. Particularly, Aparna Baskaran of Brandeis University, Massachusetts, USA, and Cristina Marchetti of Syracuse University, New York, USA, focused on ordered groups of elongated self-propelled particles. They studied the breakdown of long-range order due to fluctuations that render them unstable and give rise to complex structures, in a study about to be published in EPJ E.

Related Articles


The authors coined the term self-propelled nematics to refer to internally drivenelongated particles that spontaneously align head to tail, like tinned sardines. These are characterised by an ordered state that is stationary on average. This means that there is a long-range order, i.e., the long axes of the molecules tend to align along a preferred direction, whereas the locally preferred direction may vary throughout the medium due to local strains or disturbances.

In this study, Baskaran and Marchetti first found that a uniform nematic state can be disturbed by density fluctuations associated with an upward current of active particles. Since the density in turn controls the onset of nematic order, this phenomenon is self-regulating and universal.

They also found that an instability can be triggered by a local distortion of particles' orientation. Such a distortion results in local currents that in turn amplify the distortion, leading to an instability deep inside the nematic state.

Future research will involve solving numerically the hydrodynamic equations to test the theory presented in this study and characterise the emergent structures. Ultimately, this work may help us gain a deeper understanding of pattern formation and dynamics in a variety of internally driven systems, from epithelial cells and soil bacteria such as Myxococcus xanthus, to colloidal self-propelled nanorods.


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. A. Baskaran, M. C. Marchetti. Self-regulation in self-propelled nematic fluids. The European Physical Journal E, 2012; 35 (9) DOI: 10.1140/epje/i2012-12095-8

Cite This Page:

Springer Science+Business Media. "Enigmatic nematics: Law of hydrodynamics governing the way internally driven systems behave could explain their complex structure." ScienceDaily. ScienceDaily, 29 October 2012. <www.sciencedaily.com/releases/2012/10/121029082219.htm>.
Springer Science+Business Media. (2012, October 29). Enigmatic nematics: Law of hydrodynamics governing the way internally driven systems behave could explain their complex structure. ScienceDaily. Retrieved March 26, 2015 from www.sciencedaily.com/releases/2012/10/121029082219.htm
Springer Science+Business Media. "Enigmatic nematics: Law of hydrodynamics governing the way internally driven systems behave could explain their complex structure." ScienceDaily. www.sciencedaily.com/releases/2012/10/121029082219.htm (accessed March 26, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Thursday, March 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Amazon Complains U.S. Is Too Slow To Regulate Drones

Amazon Complains U.S. Is Too Slow To Regulate Drones

Newsy (Mar. 25, 2015) Days after getting approval to test certain commercial drones, Amazon says the Federal Aviation Administration is dragging its feet on the matter. Video provided by Newsy
Powered by NewsLook.com
Smartphone Use Changing Our Brain and Thumb Interaction, Say Researchers

Smartphone Use Changing Our Brain and Thumb Interaction, Say Researchers

Reuters - Innovations Video Online (Mar. 25, 2015) European researchers say our smartphone use offers scientists an ideal testing ground for human brain plasticity. Dr Ako Ghosh&apos;s team discovered that the brains and thumbs of smartphone users interact differently from those who use old-fashioned handsets. Jim Drury went to meet him. Video provided by Reuters
Powered by NewsLook.com
China Wants to Export Its Steel Problem

China Wants to Export Its Steel Problem

Reuters - Business Video Online (Mar. 25, 2015) China is facing a crisis with a glut of steel and growing public anger over the pollution created by production. In a move to solve the problem, some steel mills are looking to relocate overseas. Jane Lanhee Lee reports. Video provided by Reuters
Powered by NewsLook.com
Robot Stays on Its Feet Despite Punishment

Robot Stays on Its Feet Despite Punishment

Reuters - Innovations Video Online (Mar. 24, 2015) Robotic engineers have modelled a two-legged robot to be fast and agile like an ostrich. The design is more efficient and stable than bipedal robots built to move like humans, according to its creators who abuse the poor machine to test its skills. Ben Gruber has more. 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:

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