Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Nanotribology: Tubular probes: Short, capped single-walled carbon nanotubes may serve as ideal probing tips to study friction, lubrication and wear at the microscale

Atomistic simulations show that short, capped single-walled carbon nanotubes (red) can elucidate the tribological properties of graphene surfaces
Copyright : 2011 Elsevier
Atomistic simulations show that short, capped single-walled carbon nanotubes (red) can elucidate the tribological properties of graphene surfaces

Copyright : 2011 Elsevier

Abstract:
Studying microscopic interactions at single asperities is vital for the understanding of friction and lubrication at the macroscale. Surface probe instruments with carbon nanotube tips may enable such investigations, as now demonstrated in a theoretical study led by Ping Liu and Yong-Wei Zhang at the A*STAR Institute of High Performance Computing1. The researchers showed that short, single-walled, capped carbon nanotubes are able to capture the frictional characteristics of graphene with atomic resolution.

Nanotribology: Tubular probes: Short, capped single-walled carbon nanotubes may serve as ideal probing tips to study friction, lubrication and wear at the microscale

Singapore | Posted on November 29th, 2011

"For an ideal probing tip, its dimension should be as small as possible, its rigidity should be as large as possible, its geometry should be well-defined, and it should be chemically inert," explains Liu. The combination of such characteristics would allow surface characterization with atomic resolution while ensuring a long lifetime and geometrical, chemical and physical stability of the tip.

Carbon nanotubes, in particular short ones, are of great interest due to their inherent strong carbon-carbon bonds, which allows them to withstand buckling and bending deformation and recover to their original shape after deformation. Capped tubes in turn offer improved chemical stability and stiffness in comparison to non-capped tubes. These considerations indicate that short, capped single-walled carbon nanotubes may be ideal imaging probe tips.

As it is not yet possible to use such tips in experimental setups, to test this hypothesis Liu and Zhang performed large-scale atomistic simulations focusing on the interaction between such nanotube probing tips and graphene (see image)a carbon material that is ideal for surface coating lubrication. "Because of advances in the development of accurate atomic potentials and massive parallel computing algorithms, atomistic simulations not only enable us to determine the probing characteristics of such tips, but also to investigate the frictional and defect characteristics of graphene with atomic resolution," says Liu.

The simulations could capture the dependence of the friction and average normal forces on tip-to-surface distance and number of graphene layers. The researchers analyzed and interpreted the observed characteristics in terms of different types of sliding motions of the tip across the surface, as well as energy dissipation mechanisms between the tip and underlying graphene layers. They could further identify clear signatures that distinguish the motion of a tip across a point defect or the so-called Stone-Thrower-Wales defect, which is thought to be responsible for nanoscale plasticity and brittle-ductile transitions in the graphene carbon lattice. "Our simulations provide insight into nanoscale friction and may provide guidelines on how to control it," says Liu.

The A*STAR-affiliated researchers contributing to this research are from the Institute of High Performance Computing.

####

For more information, please click here

Copyright © The Agency for Science, Technology and Research (A*STAR)

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

Institute of High Performance Computing:

Research Article in Carbon:

Related News Press

News and information

New record: 3D-printed optical-electronic integration June 18th, 2019

Can break junction techniques still offer quantitative information at single-molecule level June 18th, 2019

University of Konstanz researchers create uniform-shape polymer nanocrystals: Researchers from the University of Konstanz's CRC 1214 'Anisotropic Particles as Building Blocks: Tailoring Shape, Interactions and Structures' generate uniform-shape nanocrystals using direct polymeriz June 14th, 2019

Small currents for big gains in spintronics: A new low-power magnetic switching component could aid spintronic devices June 14th, 2019

Graphene/ Graphite

Making graphene-based desalination membranes less prone to defects, better at separating June 13th, 2019

Flexible generators turn movement into energy: Rice University's laser-induced graphene nanogenerators could power future wearables June 2nd, 2019

Laser technique could unlock use of tough material for next-generation electronics: Researchers make graphene tunable, opening up its band gap to a record 2.1 electronvolts May 30th, 2019

Imaging

New Video Highlights Specific Topics Sought in Call for Papers for the 2019 IEEE International Electron Devices Meeting (IEDM) June 13th, 2019

2D crystals conforming to 3D curves create strain for engineering quantum devices June 7th, 2019

Nanotubes/Buckyballs/Fullerenes/Nanorods

Making graphene-based desalination membranes less prone to defects, better at separating June 13th, 2019

Shaking hands with human or robot? Nanotubes make them alike as never before June 6th, 2019

Generating high-quality single photons for quantum computing: New dual-cavity design emits more single photons that can carry quantum information at room temperature May 17th, 2019

Self-powered wearable tech May 8th, 2019

Discoveries

New record: 3D-printed optical-electronic integration June 18th, 2019

Can break junction techniques still offer quantitative information at single-molecule level June 18th, 2019

Mysterious Majorana quasiparticle is now closer to being controlled for quantum computing: Princeton researchers detect a robust Majorana quasiparticle and show how it can be turned on and off June 14th, 2019

University of Konstanz researchers create uniform-shape polymer nanocrystals: Researchers from the University of Konstanz's CRC 1214 'Anisotropic Particles as Building Blocks: Tailoring Shape, Interactions and Structures' generate uniform-shape nanocrystals using direct polymeriz June 14th, 2019

Announcements

New record: 3D-printed optical-electronic integration June 18th, 2019

Can break junction techniques still offer quantitative information at single-molecule level June 18th, 2019

University of Konstanz researchers create uniform-shape polymer nanocrystals: Researchers from the University of Konstanz's CRC 1214 'Anisotropic Particles as Building Blocks: Tailoring Shape, Interactions and Structures' generate uniform-shape nanocrystals using direct polymeriz June 14th, 2019

Small currents for big gains in spintronics: A new low-power magnetic switching component could aid spintronic devices June 14th, 2019

Tools

University of Aberdeen use the Deben CT5000 to observe compressive damage mechanisms in syntactic foam June 14th, 2019

2D crystals conforming to 3D curves create strain for engineering quantum devices June 7th, 2019

nPoint piezo driven nanopositioning flexure stages now available from Elliot Scientific June 4th, 2019

New Argonne coating could have big implications for lithium batteries May 14th, 2019

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