Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > The secret to improving liquid crystal's mechanical performance: Better lubricating properties of lamellar liquid crystals could stem from changing the mobility of their structural dislocations by adding nanoparticles

Abstract:
By deliberately interrupting the order of materials - by introducing different atoms in metal or nanoparticles in liquid crystals - we can induce new qualities. For example, metallic alloys like duralumin, which is composed of 95% of aluminium and 5% copper, are usually harder than the pure metals. This is due to an elastic interaction between the defects of the crystal, called dislocations, and the solute atoms, which form what are referred to as Cottrell clouds around them.

The secret to improving liquid crystal's mechanical performance: Better lubricating properties of lamellar liquid crystals could stem from changing the mobility of their structural dislocations by adding nanoparticles

Heidelberg, Germany | Posted on October 13th, 2017

In such clouds, the concentration of solute atoms is higher than the mean concentration in the material. In a paper published in EPJ E, Patrick Oswald from the École Normale Supérieure of Lyon, France, and Lubor Lejček from the Czech Academy of Sciences have now theoretically calculated the static and dynamical properties of the Cottrell clouds, which form around edge dislocations in lamellar liquid crystals of the smectic A variety decorated with nanoparticles. This work could be important, for example, in the context of improving the lubricating performance of such liquid crystals. The Cottrell clouds are difficult to study in solid materials, and even more so when the dislocations are in motion. This is not the case in a smectic A liquid crystals doped with gold nanoparticles where the Cottrell clouds are visible under a simple optical microscope. In addition, the density of dislocations can be controlled experimentally in these materials, allowing the dislocation mobility to be directly measured. A recent experiment showed that it decreases as the concentration of nanonoparticles increases. This leads to a hardening of the material, very similar to what is observed in metallic alloys. When the dislocations move slowly, the Cottrell clouds of nanoparticles are dragged by the dislocations, which decreases their mobility. In this study, the authors demonstrate a formula previously used to approximate the mobility of dislocations in the presence of Cottrell clouds. They then perform a numerical simulation of the problem to study how the Cottrell cloud erodes when the dislocation moves at high speed.

####

For more information, please click here

Contacts:
Sabine Lehr

49-622-148-78336

Copyright © Springer

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Reference: P. Oswald & L. Lejček (2017). Drag of a Cottrell atmosphere by an edge dislocation in a smectic-A liquid crystal, Eur. Phys. J. E 40: 84 DOI 10.1140/epje/i2017-11573-9:

Related News Press

News and information

Bending light around tight corners without backscattering losses: New photonic crystal waveguide based on topological insulators paves the way to build futuristic light-based computers November 19th, 2018

Park Systems Announces Grand Opening Ceremony for Their New Office in Beijing China November 19th, 2018

Bosch provides customized IoT and Industry 4.0 solutions: Bosch Mondeville and Bosch Connected Devices and Solutions collaborate to meet a wide variety of customer requirements November 16th, 2018

GaN Rising: UC Santa Barbara electrical and computer engineering professor Umesh Mishra to deliver 63rd Annual Faculty Research Lecture November 16th, 2018

Nanometrics Completes Acquisition of 4D Technology Corporation: The addition of Dynamic Interferometry® expands process control technology solutions November 16th, 2018

Display technology/LEDs/SS Lighting/OLEDs

GaN Rising: UC Santa Barbara electrical and computer engineering professor Umesh Mishra to deliver 63rd Annual Faculty Research Lecture November 16th, 2018

Iran Unveils Its First Homegrown 3D Nano Printer October 17th, 2018

Aculon, Inc. Enters into Strategic Partnership Agreement with Henkel Corporation to Supply Key Mobile Device Manufacturers with NanoProof® PCB Waterproof Technology October 17th, 2018

Physics

Physicists name and codify new field in nanotechnology: ‘electron quantum metamaterials:’ UC Riverside’s Nathaniel Gabor and colleague formulate a vision for the field in a perspective article November 5th, 2018

2-D magnetism: Atom-thick platforms for energy, information and computing research: Scientists say the tiny 'spins' of electrons show potential to one day support next-generation innovations in many fields October 31st, 2018

Possible Futures

Bending light around tight corners without backscattering losses: New photonic crystal waveguide based on topological insulators paves the way to build futuristic light-based computers November 19th, 2018

Park Systems Announces Grand Opening Ceremony for Their New Office in Beijing China November 19th, 2018

Scientists produce 3D chemical maps of single bacteria: Researchers at NSLS-II used ultrabright x-rays to generate 3-D nanoscale maps of a single bacteria's chemical composition with unparalleled spatial resolution November 16th, 2018

GaN Rising: UC Santa Barbara electrical and computer engineering professor Umesh Mishra to deliver 63rd Annual Faculty Research Lecture November 16th, 2018

Discoveries

Bending light around tight corners without backscattering losses: New photonic crystal waveguide based on topological insulators paves the way to build futuristic light-based computers November 19th, 2018

Scientists produce 3D chemical maps of single bacteria: Researchers at NSLS-II used ultrabright x-rays to generate 3-D nanoscale maps of a single bacteria's chemical composition with unparalleled spatial resolution November 16th, 2018

'Smart skin' simplifies spotting strain in structures: Rice U. invention can use fluorescing carbon nanotubes to reveal stress in aircraft, structures November 15th, 2018

Epoxy compound gets a graphene bump: Rice scientists combine graphene foam, epoxy into tough, conductive composite November 14th, 2018

Materials/Metamaterials

GaN Rising: UC Santa Barbara electrical and computer engineering professor Umesh Mishra to deliver 63rd Annual Faculty Research Lecture November 16th, 2018

Optimization of alloy materials: Diffusion processes in nano particles decoded November 13th, 2018

Unlocking the Secrets of Metal-Insulator Transitions: X-ray photon correlation spectroscopy at NSLS-II's CSX beamline used to understand electrical conductivity transitions in magnetite November 8th, 2018

Physicists name and codify new field in nanotechnology: ‘electron quantum metamaterials:’ UC Riverside’s Nathaniel Gabor and colleague formulate a vision for the field in a perspective article November 5th, 2018

Announcements

Bending light around tight corners without backscattering losses: New photonic crystal waveguide based on topological insulators paves the way to build futuristic light-based computers November 19th, 2018

Park Systems Announces Grand Opening Ceremony for Their New Office in Beijing China November 19th, 2018

Bosch provides customized IoT and Industry 4.0 solutions: Bosch Mondeville and Bosch Connected Devices and Solutions collaborate to meet a wide variety of customer requirements November 16th, 2018

GaN Rising: UC Santa Barbara electrical and computer engineering professor Umesh Mishra to deliver 63rd Annual Faculty Research Lecture November 16th, 2018

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Bending light around tight corners without backscattering losses: New photonic crystal waveguide based on topological insulators paves the way to build futuristic light-based computers November 19th, 2018

Scientists produce 3D chemical maps of single bacteria: Researchers at NSLS-II used ultrabright x-rays to generate 3-D nanoscale maps of a single bacteria's chemical composition with unparalleled spatial resolution November 16th, 2018

'Smart skin' simplifies spotting strain in structures: Rice U. invention can use fluorescing carbon nanotubes to reveal stress in aircraft, structures November 15th, 2018

Epoxy compound gets a graphene bump: Rice scientists combine graphene foam, epoxy into tough, conductive composite November 14th, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project