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, 2012In 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:
| Related Links |
Link to the original paper on Wiley Online Library:
| Related News Press |
News and information
Simulating magnetization in a Heisenberg quantum spin chain April 5th, 2024
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Chemistry
What heat can tell us about battery chemistry: using the Peltier effect to study lithium-ion cells March 8th, 2024
Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024
Molecular Machines
First electric nanomotor made from DNA material: Synthetic rotary motors at the nanoscale perform mechanical work July 22nd, 2022
Nanotech scientists create world's smallest origami bird March 17th, 2021
Giant nanomachine aids the immune system: Theoretical chemistry August 28th, 2020
Molecular Nanotechnology
Scientists push the boundaries of manipulating light at the submicroscopic level March 3rd, 2023
First electric nanomotor made from DNA material: Synthetic rotary motors at the nanoscale perform mechanical work July 22nd, 2022
Nanotech scientists create world's smallest origami bird March 17th, 2021
Nanomedicine
New micromaterial releases nanoparticles that selectively destroy cancer cells April 5th, 2024
Good as gold - improving infectious disease testing with gold nanoparticles April 5th, 2024
Researchers develop artificial building blocks of life March 8th, 2024
Discoveries
Chemical reactions can scramble quantum information as well as black holes April 5th, 2024
New micromaterial releases nanoparticles that selectively destroy cancer cells April 5th, 2024
Utilizing palladium for addressing contact issues of buried oxide thin film transistors April 5th, 2024
Announcements
NRL charters Navy’s quantum inertial navigation path to reduce drift April 5th, 2024
Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024
Environment
Billions of nanoplastics released when microwaving baby food containers: Exposure to plastic particles kills up to 75% of cultured kidney cells July 21st, 2023
 |
||
 |
||
| The latest news from around the world, FREE | ||
 |
||
|
|
||
| Premium Products | ||
 |
||
|
Only the news you want to read!
Learn More |
||
 |
||
|
Full-service, expert consulting
Learn More |
||
|
|
||