PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Good hair day: New technique grows tiny 'hairy' materials at the microscale

2014-02-05
(Press-News.org) Contact information: Louise Lerner
Louise@anl.gov
630-252-5526
DOE/Argonne National Laboratory
Good hair day: New technique grows tiny 'hairy' materials at the microscale

Scientists at the U.S. Department of Energy's Argonne National Laboratory attacked a tangled problem by developing a new technique to grow tiny "hairy" materials that assemble themselves at the microscale.

The key ingredient is epoxy, which is added to a mixture of hardener and solvent inside an electric cell. Then the scientists run an alternating current through the cell and watch long, twisting fibers spring up. It looks like the way Chia Pets grow in commercials.

"The process is very simple, the materials are cheap and available and they can grow on almost every surface we've tried," said Argonne physicist Igor Aronson, who co-authored the study.

By tweaking the process, the team can grow many different shapes: short forests of dense straight hairs, long branching strands or "mushrooms" with tiny pearls at the tips. Interestingly, though the structures can be permanent, the process is also instantly reversible.

"This is a completely new kind of structure," said Argonne physicist Alexey Snezhko, also a co-author. "With this method, you can support more complex structures that have unique properties."

Scientists are very interested in materials with tiny fibers for technologies like batteries, photovoltaic cells or sensors. For one, "hairy" materials offer up a lot of surface area. Many chemical reactions depend on two surfaces making contact with one another, so a structure that exposes a lot of surface area will speed the process along. (For example, grinding coffee beans gives the coffee more flavor than soaking whole beans in water.) Micro-size hairs can also make a surface that repels water, called superhydrophobic, or dust.

The tiny-fiber structure is so useful that it's evolved several times in nature, Aronson pointed out. For example, blood vessels are lined with a layer of similar tiny protein "hairs," thought to help reduce wear and tear by blood cells and bacterial infections, among other properties.

Currently, the primary methods of creating interesting shapes at small scales is lithography, a type of "printing" where researchers lay a pattern on the material and the rest of it is melted or etched away. But it's hard to make very complex structures with this method; it's hard to control; and the results aren't always uniform.

"These polymers assemble themselves," Snezhko explained, "which is much easier and less labor-intensive than lithography."

In one experiment the researchers used a process called atomic layer deposition that deposits a molecule-thick layer of material over the entire hairy structure, like a fresh blanket of snow, to add a layer of semiconductor material. Semiconductors are essential ingredients in many technologies, such as solar cells and electronics.

This provided proof of concept that the polymer could be incorporated into semiconductor-based renewable energy technologies. It also proved that it could survive high temperatures, up to 150°C, an essential property for many manufacturing processes.

Right now the structures are about a single micron thick—you could stack 100 of them to reach the width of a sheet of paper. Aronson and Snezhko said their next goal is to get them even smaller, to the nanoscale.

VIDEO: These tiny "hairs " assemble themselves almost instantly when scientists apply an alternating electrical current. The entire field of view is smaller than the thickness of a credit card. Argonne National...
Click here for more information.



INFORMATION:

The study, "Self-assembled tunable networks of sticky colloidal particles," was published last week in Nature Communications. Argonne scientists Arnaud Demortière and Thomas Proslier were co-authors on the study, along with Nicholas Becker (Illinois Institute of Technology) and Maksim Sapozhnikov (Russian Academy of Sciences and N.I. Lobachevsky State University).

Funding for the research came from the U.S. Department of Energy's Office of Science and the Russian Foundation for Basic Research. Use of Argonne's Center for Nanoscale Materials to characterize the samples was supported by the DOE's Office of Science, Office of Basic Energy Sciences.

Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation's first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America's scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy's Office of Science.

The Center for Nanoscale Materials at Argonne National Laboratory is one of the five DOE Nanoscale Science Research Centers (NSRCs), premier national user facilities for interdisciplinary research at the nanoscale, supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE's Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge and Sandia and Los Alamos National Laboratories.

DOE's Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov.



ELSE PRESS RELEASES FROM THIS DATE:

Story tips from the Department of Energy's Oak Ridge National Laboratory, February 2014

2014-02-05
ENERGY – LEDs to light UT arena . . . With the installation this month of LED fixtures, the University of Tennessee's Thompson-Boling Arena will become the first major sports ...

Brain scans show we take risks because we can't stop ourselves

2014-02-05
A new study correlating brain activity with how people make decisions ...

For viewers, Sochi will be first 'fully mobile' Olympics

2014-02-05
Akron, Ohio, Feb. 4, 2014 — The Sochi Winter Olympics, Feb. 7-23, are expected to generate a dramatic rise in Web and mobile viewing, but that does not mean viewers will ...

Nerve block eases troublesome hot flashes

2014-02-05
CLEVELAND, Ohio (February 5, 2014)—Injecting a little anesthetic near a nerve bundle ...

Wider-faced dates more attractive as short-term mates

2014-02-05
Women may perceive men with wider faces as more dominant and more attractive for short-term relationships, according to a new study in Psychological Science, a journal of the Association ...

Research shows that reported oil sands emissions greatly underestimated

2014-02-04
TORONTO, ON - A new comprehensive modeling assessment of contamination in the Athabasca Oil Sands Region indicates that officially reported emissions of certain hazardous air pollutants have ...

'Not my child' -- Most parents fail to recognize if their child is overweight

2014-02-04
LINCOLN, Neb., Feb. 3, 2014 – In the idyllic town of Lake Wobegon, all the children are above average. And, judging by a new study by University of Nebraska-Lincoln researchers, ...

Appearance of Lyme disease rash can help predict how bacteria spreads through body

2014-02-04
PUBLIC RELEASE DATE: 4-Feb-2014 [ | E-mail ] var addthis_pub="eurekalert"; var addthis_options = "favorites, delicious, digg, facebook, twitter, google, newsvine, reddit, slashdot, stumbleupon, buzz, more" Share Contact: Mary Beth O'Leary moleary@cell.com 617-397-2802 Cell Press Appearance of Lyme disease rash can help predict how bacteria spreads through body VIDEO: This is a simulation that shows the development of a Lyme disease rash in time. ...

Shivering could elicit some of the same benefits as exercise

2014-02-04
It's common knowledge that shivering in the cold is part of the body's attempt to stay warm. According to new research into the mechanisms involved, shivering releases a hormone that stimulates fat tissue to produce ...

Study reveals how cancer cells thrive in oxygen-starved tumors

2014-02-04
COLUMBUS, Ohio – A new study identifies the molecular pathway that enables cancer cells to grow in areas of a tumor where oxygen levels are low, a condition called hypoxia. The findings by researchers ...

LAST 30 PRESS RELEASES:

Thirty-year mystery of dissonance in the “ringing” of black holes explained

Less intensive works best for agricultural soil

Arctic rivers project receives “national champion” designation from frontiers foundation

Computational biology paves the way for new ALS tests

Study offers new hope for babies born with opioid withdrawal syndrome

UT, Volkswagen Group of America celebrate research partnership

New Medicare program could dramatically improve affordability for cancer drugs – if patients enroll

Are ‘zombie’ skin cells harmful or helpful? The answer may be in their shapes

University of Cincinnati Cancer Center presents research at AACR 2025

Head and neck, breast, lung and survivorship studies headline Dana-Farber research at AACR Annual Meeting 2025

AACR: Researchers share promising results from MD Anderson clinical trials

New research explains why our waistlines expand in middle age

Advancements in muon detection: Taishan Antineutrino Observatory's innovative top veto tracker

Chips off the old block

Microvascular decompression combined with nerve combing for atypical trigeminal neuralgia

Cutting the complexity from digital carpentry

Lung immune cell type “quietly” controls inflammation in COVID-19

Fiscal impact of expanded Medicare coverage for GLP-1 receptor agonists to treat obesity

State and sociodemographic trends in US cigarette smoking with future projections

Young adults drive historic decline in smoking

NFCR congratulates Dr. Robert C. Bast, Jr. on receiving the AACR-Daniel D. Von Hoff Award for Outstanding Contributions to Education and Training in Cancer Research

Chimpanzee stem cells offer new insights into early embryonic development

This injected protein-like polymer helps tissues heal after a heart attack

FlexTech inaugural issue launches, pioneering interdisciplinary innovation in flexible technology

In Down syndrome mice, 40Hz light and sound improve cognition, neurogenesis, connectivity

Methyl eugenol: potential to inhibit oxidative stress, address related diseases, and its toxicological effects

A vascularized multilayer chip reveals shear stress-induced angiogenesis in diverse fluid conditions

AI helps unravel a cause of Alzheimer's disease and identify a therapeutic candidate

Coalition of Autism Scientists critiques US Department of Health and Human Services Autism Research Initiative

Structure dictates effectiveness, safety in nanomedicine

[Press-News.org] Good hair day: New technique grows tiny 'hairy' materials at the microscale