Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button

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

Nanoparticle versus cancer: Scientists have created nanoparticles which cure cancer harmlessly July 22nd, 2016

Quantum drag:University of Iowa physicist says current in one iron magnetic sheet can create quantized spin waves in another, separate sheet July 22nd, 2016

New Yale-developed device lengthens the life of quantum information July 22nd, 2016

RMIT researchers make leap in measuring quantum states July 21st, 2016

The future of perovskite solar cells has just got brighter -- come rain or shine: Korean researchers at POSTECH have succeeded in developing high-efficiency perovskite solar cells that retain excellent performance over two months in a very humid condition July 21st, 2016

Chemistry

New reaction for the synthesis of nanostructures July 21st, 2016

Pushing a single-molecule switch: An international team of researchers from Donostia International Physics Center, Fritz-Haber Institute of the Max Planck Society, University of Liverpool, and the Polish Academy of Sciences has shown a new way to operate a single-molecule switch July 19th, 2016

Rice's 'antenna-reactor' catalysts offer best of both worlds: Technology marries light-harvesting nanoantennas to high-reaction-rate catalysts July 18th, 2016

Molecular Machines

Pushing a single-molecule switch: An international team of researchers from Donostia International Physics Center, Fritz-Haber Institute of the Max Planck Society, University of Liverpool, and the Polish Academy of Sciences has shown a new way to operate a single-molecule switch July 19th, 2016

Researchers harness DNA as the engine of super-efficient nanomachine: New platform detects traces of everything from bacteria to viruses, cocaine and metals July 10th, 2016

On the path toward molecular robots: Scientists at Japan's Hokkaido University have developed light-powered molecular motors that repetitively bend and unbend, bringing us closer to molecular robots. July 8th, 2016

Rice University's nanosubs gain better fluorescent properties for tracking June 17th, 2016

Molecular Nanotechnology

Scientists develop way to upsize nanostructures into light, flexible 3-D printed materials: Virginia Tech, Livermore National Lab researchers develop hierarchical 3-D printed metallic materials July 20th, 2016

Pushing a single-molecule switch: An international team of researchers from Donostia International Physics Center, Fritz-Haber Institute of the Max Planck Society, University of Liverpool, and the Polish Academy of Sciences has shown a new way to operate a single-molecule switch July 19th, 2016

Researchers harness DNA as the engine of super-efficient nanomachine: New platform detects traces of everything from bacteria to viruses, cocaine and metals July 10th, 2016

On the path toward molecular robots: Scientists at Japan's Hokkaido University have developed light-powered molecular motors that repetitively bend and unbend, bringing us closer to molecular robots. July 8th, 2016

Nanomedicine

Nanoparticle versus cancer: Scientists have created nanoparticles which cure cancer harmlessly July 22nd, 2016

Research examines how to optimize nanoparticles for efficient drug delivery July 21st, 2016

Renishaw's inVia™ confocal Raman microscope is used to study blood stored in plastic blood bags July 19th, 2016

Keystone Nano selected as a top scoring company by NCI investor review panel July 19th, 2016

Discoveries

Nanoparticle versus cancer: Scientists have created nanoparticles which cure cancer harmlessly July 22nd, 2016

Quantum drag:University of Iowa physicist says current in one iron magnetic sheet can create quantized spin waves in another, separate sheet July 22nd, 2016

New Yale-developed device lengthens the life of quantum information July 22nd, 2016

Research team led by NUS scientists develop plastic flexible magnetic memory device: Novel technique to implant high-performance magnetic memory chip on a flexible plastic surface without compromising performance July 21st, 2016

Announcements

Nanoparticle versus cancer: Scientists have created nanoparticles which cure cancer harmlessly July 22nd, 2016

Quantum drag:University of Iowa physicist says current in one iron magnetic sheet can create quantized spin waves in another, separate sheet July 22nd, 2016

New Yale-developed device lengthens the life of quantum information July 22nd, 2016

Graphene photodetectors: Thinking outside the 2-D box July 21st, 2016

Environment

News from Quorum: The College of New Jersey use the Quorum Cryo-SEM preparation system in a project to study ice crystals in high altitude clouds July 19th, 2016

Researchers improve catalyst efficiency for clean industries: Method reduces use of expensive platinum July 8th, 2016

Electronic nose smells pesticides and nerve gas July 6th, 2016

Wireless, wearable toxic-gas detector: Inexpensive sensors could be worn by soldiers to detect hazardous chemical agents July 4th, 2016

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







Car Brands
Buy website traffic