Nanotechnology Now

Our NanoNews Digest Sponsors


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

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Doubling down on Schrödinger's cat May 27th, 2016

Deep Space Industries and SFL selected to provide satellites for HawkEye 360’s Pathfinder mission: The privately-funded space-based global wireless signal monitoring system will be developed by Deep Space Industries and UTIAS Space Flight Laboratory May 26th, 2016

Chemistry

Syracuse University chemists add color to chemical reactions: Chemists in the College of Arts and Sciences have come up with an innovative new way to visualize and monitor chemical reactions in real time May 19th, 2016

Technique improves the efficacy of fuel cells: Research demonstrates a new phase transition from metal to ionic conductor May 18th, 2016

Physicists measure van der Waals forces of individual atoms for the first time May 14th, 2016

Atomic force microscope reveals molecular ghosts: Mapping molecules with atomic precision expands toolbox for designing new catalytic reactions May 11th, 2016

Molecular Machines

Little ANTs: Researchers build the world's tiniest engine May 3rd, 2016

Researchers create artificial protein to control assembly of buckyballs April 27th, 2016

Physicists build engine consisting of one atom: World's smallest heat engine uses just a single particle April 17th, 2016

Revealing the fluctuations of flexible DNA in 3-D: First-of-their-kind images by Berkeley Lab-led research team could aid in use of DNA to build nanoscale devices March 31st, 2016

Molecular Nanotechnology

Little ANTs: Researchers build the world's tiniest engine May 3rd, 2016

Researchers create artificial protein to control assembly of buckyballs April 27th, 2016

Physicists build engine consisting of one atom: World's smallest heat engine uses just a single particle April 17th, 2016

Physicists prove energy input predicts molecular behavior: Theoretical proof could lead to more reliable nanomachines March 22nd, 2016

Nanomedicine

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Supercrystals with new architecture can enhance drug synthesis May 24th, 2016

Nanoscale Trojan horses treat inflammation May 24th, 2016

Discoveries

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Doubling down on Schrödinger's cat May 27th, 2016

Finding a new formula for concrete: Researchers look to bones and shells as blueprints for stronger, more durable concrete May 26th, 2016

Announcements

Simple attraction: Researchers control protein release from nanoparticles without encapsulation: U of T Engineering discovery stands to improve reliability and fabrication process for treatments to conditions such as spinal cord damage and stroke May 28th, 2016

Scientists illuminate a hidden regulator in gene transcription: New super-resolution technique visualizes important role of short-lived enzyme clusters May 27th, 2016

Doubling down on Schrödinger's cat May 27th, 2016

Deep Space Industries and SFL selected to provide satellites for HawkEye 360’s Pathfinder mission: The privately-funded space-based global wireless signal monitoring system will be developed by Deep Space Industries and UTIAS Space Flight Laboratory May 26th, 2016

Environment

The next generation of carbon monoxide nanosensors May 26th, 2016

Novel functionalized nanomaterials for CO2 capture May 10th, 2016

First single-enzyme method to produce quantum dots revealed: Biological manufacturing process, pioneered by three Lehigh University engineers, produces equivalent quantum dots to those made chemically--but in a much greener, cheaper way May 9th, 2016

Los Alamos National Laboratory Expands Scope to Locus Technologies SaaS Contract: Los Alamos National Laboratory Adds Two New Applications to Locus SaaS Platform May 7th, 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