Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Micromotion Gets a Two-Faced Lift: Using Janus Particles for Chemical Power

Abstract:
Janus particles, named after the Roman god with two opposing faces, are asymmetrical objects with distinct surface regions of different chemical or physical properties. The particular Janus particles created by this group from America are aluminium microspheres of between 5 and 30 μm in diameter that have been partially coated with palladium.

Micromotion Gets a Two-Faced Lift: Using Janus Particles for Chemical Power

Germany | Posted on November 15th, 2012

In pH 4-11, the particle's partial palladium coating catalyses the decomposition of any hydrogen peroxide in the surrounding solution, producing water and oxygen bubbles. The evolution of oxygen generates thrust, propelling the particles forward in the direction of their uncoated aluminium segment. One limiting factor to the application of micromotors like these, however, is that the hydrogen peroxide commonly used to fuel their motion is required in high concentrations. Handy, then, that these Janus particles can run on more than one fuel type.

Under either acidic or basic conditions, the uncoated aluminium part reacts with either hydrogen or hydroxide ions, in both cases producing hydrogen bubbles, which propels the particle in the opposite direction, toward its palladium shell. A speed of 25 μm per second was achieved by these particles under basic conditions, but a higher speed yet was reached in an acid medium of the same concentration, slightly outdoing the palladium/hydrogen peroxide propulsion speed at 36 μm per second.

The call for self-propelled nano/microscale particles is very broad, echoing across such hot fields as targeted drug delivery and environmental remediation. While the ability to autonomously switch fuels in response to changes in their environment represents both an advantage and an engineering challenge—in keeping with the two-faced nature of the particles themselves—the beautiful simplicity and extraordinary versatility of these Al/Pd particles are a major advantage. Their ability to adapt chemically for self-propulsion in different media will allow their use in completely different or changing environments without modification, giving them a very competitive edge across a variety of applications.

####

For more information, please click here

Copyright © Wiley-VCH Materials Science Journals

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

Link to the original paper on Wiley Online Library:

Related News Press

News and information

International research partnership tricks the light fantastic March 2nd, 2015

UC research partnership explores how to best harness solar power March 2nd, 2015

Researchers turn unzipped nanotubes into possible alternative for platinum: Aerogel catalyst shows promise for fuel cells March 2nd, 2015

Important step towards quantum computing: Metals at atomic scale March 2nd, 2015

Chemistry

Chromium-Centered Cycloparaphenylene Rings as New Tools for Making Functionalized Nanocarbons February 24th, 2015

Stretch and relax! -- Losing 1 electron switches magnetism on in dichromium February 23rd, 2015

A straightforward, rapid and continuous method to protect MOF nanocrystals against water February 9th, 2015

Research shows benefits of silicon carbide for sensors in harsh environments: Advantages identified across industries February 9th, 2015

Molecular Machines

Monitoring the real-time deformation of carbon nanocoils under axial loading February 18th, 2015

Stomach acid-powered micromotors get their first test in a living animal January 27th, 2015

Nanoshuttle wear and tear: It's the mileage, not the age January 26th, 2015

Mysteries of ‘Molecular Machines’ Revealed: Phenix software uses X-ray diffraction spots to produce 3-D image December 22nd, 2014

Molecular Nanotechnology

Monitoring the real-time deformation of carbon nanocoils under axial loading February 18th, 2015

Nanotechnology: Better measurements of single molecule circuits February 18th, 2015

Half spheres for molecular circuits: Corannulene shows promising electronic properties February 17th, 2015

Tiny robotic 'hands' could improve cancer diagnostics, drug delivery February 4th, 2015

Nanomedicine

New nanodevice defeats drug resistance: Tiny particles embedded in gel can turn off drug-resistance genes, then release cancer drugs March 2nd, 2015

New Hopes for Treatment of Intestine Cancer by Edible Nanodrug March 2nd, 2015

Graphene Shows Promise In Eradication Of Stem Cancer Cells March 1st, 2015

Novel Method to Determine Optical Purity of Drug Components March 1st, 2015

Discoveries

Colon + septic tank = unique, at times stinky, study: Researchers use lab-scale human colon and septic tank to study impact of copper nanoparticles on the environment March 2nd, 2015

New nanodevice defeats drug resistance: Tiny particles embedded in gel can turn off drug-resistance genes, then release cancer drugs March 2nd, 2015

Breakthrough in OLED technology March 2nd, 2015

Important step towards quantum computing: Metals at atomic scale March 2nd, 2015

Announcements

International research partnership tricks the light fantastic March 2nd, 2015

UC research partnership explores how to best harness solar power March 2nd, 2015

Researchers turn unzipped nanotubes into possible alternative for platinum: Aerogel catalyst shows promise for fuel cells March 2nd, 2015

Important step towards quantum computing: Metals at atomic scale March 2nd, 2015

Environment

Colon + septic tank = unique, at times stinky, study: Researchers use lab-scale human colon and septic tank to study impact of copper nanoparticles on the environment March 2nd, 2015

Simple, Cost-Efficient Method Used to Determine Toxicants Growing in Pistachio February 26th, 2015

Purification of Industrial Wastewater Using Visible-Light Sensitive Photocatalysts February 24th, 2015

Nanocomposite Membranes Used in Iran for Water Desalination, Sweetening February 16th, 2015

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




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE