Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Chemists get custom-designed microscopic particles to self-assemble in liquid crystal

Polarized light microscopy image of a square microparticle in liquid crystal
Polarized light microscopy image of a square microparticle in liquid crystal

Abstract:
Chemists and physicists have succeeded in getting custom-shaped microparticles to interact and self-assemble in a controlled way in a liquid crystal.

The research, federally funded by the National Science Foundation, appears in the Nov. 20 edition of the journal Science.

Chemists get custom-designed microscopic particles to self-assemble in liquid crystal

Los Angeles, CA | Posted on November 26th, 2009

"We're learning the rules about how these lithographic particles self-assemble," said Thomas G. Mason, a UCLA professor of chemistry and physics and a member of the California NanoSystems Institute at UCLA. "This method may enable us to cause them to assemble in desired configurations."

The scientists anticipate that their "LithoParticles," which are made of solid polymeric materials, will have significant technological and scientific uses.

"We're examining how pairs of particles interact and come to attach together," Mason said. "If we can get the particles to interact in certain controlled ways, we can build larger-scale assemblies that may have applications in photonics, optical communication networks and a variety of other areas."

Mason and his colleagues lead author Clayton Lapointe, a postdoctoral scholar at UCLA, formerly at the University of Colorado at Boulder, and Ivan Smalyukh, an assistant professor of physics at the University of Colorado at Boulder used an optical microscope to study the attractions between the particles, which they custom designed in various shapes, including triangles, squares and pentagons. The particles are too small to see with the unaided eye but are quite clear with the instrument.

"This is a very complex material that we have created," said Mason, whose research is at the intersection of chemistry, physics, engineering and biology. "We have made lithographic particles dispersed in a liquid crystal, and the molecular constituents are aligned."

Particles of different shapes interact in different ways, Lapointe, Mason and Smalyukh report. Those with an odd number of sides, such as triangles and pentagons, interact differently than particles shaped like squares.

"In this environment, the particles have different kinds of interactions that depend on their shapes," Mason said. "We have shown in a systematic way how by changing the number of sides of the particles in a controlled way, we can characterize the differences in their interactions."

The scientists added materials to the liquid crystal to get the particles to attract. They produced the geometric particles using the same method Mason and his UCLA used to design and mass-produce billions of fluorescent microscale particles in the shapes of all 26 letters of the alphabet, as well as geometric shapes, such as triangles, crosses and doughnuts, in 2007. Now they have watched the particles interact.

In another paper, UCLA postdoctoral scholar Kun Zhao and Mason report discovering new states of matter in two dimensions. Their research, which appears in the Nov. 13 edition of the journal Physical Review Letters, focused on a two-dimensional surface with pentagon-shaped particles that were free to move on this surface. Zhao and Mason studied the structures as they increased the area fraction of the pentagons in the confined two-dimensional plane. They used a lithographic technique to make the particles and studied them in water on a flat glass surface.

For information about Mason's research, visit www.chem.ucla.edu/dept/Faculty/Mason.

####

About UCLA
UCLA is California's largest university, with an enrollment of nearly 38,000 undergraduate and graduate students. The UCLA College of Letters and Science and the university's 11 professional schools feature renowned faculty and offer more than 323 degree programs and majors. UCLA is a national and international leader in the breadth and quality of its academic, research, health care, cultural, continuing education and athletic programs. Five alumni and five faculty have been awarded the Nobel Prize.

For more information, please click here

Contacts:
Media Contacts
Stuart Wolpert,
310-206-0511

Copyright © UCLA

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 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

Govt.-Legislation/Regulation/Funding/Policy

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

Forbidden quantum leaps possible with high-res spectroscopy March 2nd, 2015

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

First detailed microscopy evidence of bacteria at the lower size limit of life: Berkeley Lab research provides comprehensive description of ultra-small bacteria February 28th, 2015

Possible Futures

European roadmap for graphene science and technology published February 25th, 2015

Quantum research past, present and future for discussion at AAAS February 16th, 2015

Worlds first compact rotary 3D printer-cum-scanner unveiled at AAAS by NTU Singapore start-up: With production funded by crowdsourcing, the first unit will be delivered to the United States in March February 16th, 2015

Nanotechnology Electric Vehicle (EV) Market Analysis Report 2015: According to Radiant Insights, Inc February 13th, 2015

Self Assembly

Nanotubes self-organize and wiggle: Evolution of a nonequilibrium system demonstrates MEPP February 10th, 2015

Engineering self-assembling amyloid fibers January 26th, 2015

Revealed: How bacteria drill into our cells and kill them December 2nd, 2014

Live Images from the Nano-cosmos: Researchers watch layers of football molecules grow November 5th, 2014

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

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Glass coating improves battery performance: To improve lithium-sulfur batteries, researchers added glass cage-like coating and graphene oxide 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

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

Photonics/Optics/Lasers

Breakthrough in OLED technology March 2nd, 2015

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

Imec Demonstrates Compact Wavelength-Division Multiplexing CMOS Silicon Photonics Transceiver March 1st, 2015

Leti to Offer Updates on Silicon Photonics Successes at OFC in LA February 27th, 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