Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New material could make aircraft deicers a thing of the past

16.03.2016

Instead of applying a deicing agent to strip ice from an aircraft's wings before stormy winter takeoffs, airport personnel could in the future just watch chunks slide right off without lifting a finger. Scientists report they have developed a liquid-like substance that can make wings and other surfaces so slippery that ice cannot adhere. The slick substance is secreted from a film on the wing's surface as temperatures drop below freezing and retreats back into the film as temperatures rise.

The researchers present their work today at the 251st National Meeting & Exposition of the American Chemical Society (ACS). ACS, the world's largest scientific society, is holding the meeting here through Thursday. It features more than 12,500 presentations on a wide range of science topics.


SLUGs coatings on the right three panels at a test station repel snow and ice, but snow builds up on an untreated panel (far left).

Credit: Chihiro Urata

The liquid-secreting materials the researchers developed are called self-lubricating organogels, or SLUGs. "The SLUGs technology has a host of formulations and applications, including in a gel form that can be encapsulated in a film coating on the surface of a wing or other device," says research director Atsushi Hozumi, Ph.D.

"We came upon this idea when we observed real slugs in the environment," Chihiro Urata, Ph.D., explains. "Slugs live underground in soils when it is daytime and crawl out at night. But we never see slugs covered in dirt. They secrete a liquid mucus on their skin, which repels dirt, and the dirt slides off. From this, we started focusing on the phenomenon called syneresis, the expulsion of liquid from a gel."

... more about:
»ACS »coating »liquids »physical effects

The gel and the liquid-repellent substance are held in a matrix of silicone resin. The mix is cured and applied to a surface as a nearly transparent and solid film coating, Urata explains. Both Urata and Hozumi are at the National Institute of Advanced Industrial Science & Technology (Japan).

The team examined the anti-icing properties of several types of organogels under tests at various temperatures, Urata says. The discovery of the material's thermo-responsive secretion properties was an unexpected surprise. The tests also showed that the secretion was a reversible process. The syneresis gradually starts when temperatures fall below freezing. So although ice can still form, it cannot adhere to the surface and it slips off. Once the temperature rises above freezing, the liquids return back to the film.

Urata sees potential applications for SLUGs beyond aircraft and singles out antifouling coatings in packaging, paints, ship bottoms, metal molds and more.

Their research is currently focusing on increasing the transparency of the SLUG's coating, Urata says. "We are planning a short-term project to apply the coating where transparency is essential. For example, we are just beginning a project to field-test the durability and visibility of SLUGs coating on signage in Japan's northern counties."

###

Their research is funded through a grant-in-aid for scientific research on innovative areas from the Japanese Ministry of Education, Culture, Sports, Science and Technology.

The American Chemical Society is a nonprofit organization chartered by the U.S. Congress. With more than 158,000 members, ACS is the world's largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.

To automatically receive news releases from the American Chemical Society, contact newsroom@acs.org.

Note to journalists: Please report that this research is being presented at a meeting of the American Chemical Society.

Follow us: Twitter | Facebook

Title

Anti-Stick Coatings Using Self-Lubricating Organogels (SLUGs)

Abstract

Functional coatings with exceptional surface properties, such as liquid-repellency and low-friction/adhesion, have been commonly prepared by combining textured surfaces with long-chain perfluorinated compounds. However, unfortunately, the chemical and physical effects of the LPFCs on human health and environment have been viewed lately with concern. In addition, once such artificial surfaces are physically and chemically damaged, they permanently lose their surface properties. In contrast, some living things maintain their surface properties through secretion of plant waxes and mucus. Here, we report on novel coatings inspired by such biological systems. To realize long-lasting surface properties, we have particularly focused on the syneresis of organogels, which were prepared by hydrosilylation of 2 types of silicones, and several guest organic liquids. As compatibility between guest liquids and polymer matrixes (cross-linked polydimethylsiloxane) is decreased to a certain critical point which is induced by the chemical and/or physical effects, the guest liquids begins to gradually leach out to the outmost organogel surface. Thanks to this self-lubricating property, adhesion of various objects was effectively reduced, resulting in the excellent anti-sticking properties. Viscous liquids flowed on the syneretic organogel surface more freely than that of non-syneretic organogel surface. For the purpose of anti-icing applications, we tuned the critical incompatibility point our organogels, which possess reversible thermo-responsive secretion nature. In this case, the syneresis gradually starts when the temperature is cooled (< 0°C) and the syneresis liquids returns back into the organogel again by heating to room temperature. Thanks to this smart surface property, an ice-pillar formed on the organogel at -15°C easily slid off without any additional force. Furthermore, we have successfully demonstrated regeneration of superhydrophobicity artificially mimicking lotus leaves using n-octadecyltrichlorosilane as an active guest liquid. Our technique, demonstrated here, undoubtedly shows great potential for application in dynamic, multifunctional, and self-recovering coatings.

Media Contact

619-525-6215 (San Diego Press Center, March 13-16)

Michael Bernstein
202-872-6042 (D.C. Office)
301-275-3221 (Cell)
m_bernstein@acs.org

Katie Cottingham, Ph.D.
301-775-8455 (Cell)
k_cottingham@acs.org

@ACSpressroom
http://www.acs.org

Michael Bernstein | EurekAlert!

Further reports about: ACS coating liquids physical effects

More articles from Materials Sciences:

nachricht Modified 'white graphene' for eco-friendly energy
23.04.2019 | Tomsk Polytechnic University

nachricht New method inverts the self-assembly of liquid crystals
15.04.2019 | University of Luxembourg

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Quantum gas turns supersolid

Researchers led by Francesca Ferlaino from the University of Innsbruck and the Austrian Academy of Sciences report in Physical Review X on the observation of supersolid behavior in dipolar quantum gases of erbium and dysprosium. In the dysprosium gas these properties are unprecedentedly long-lived. This sets the stage for future investigations into the nature of this exotic phase of matter.

Supersolidity is a paradoxical state where the matter is both crystallized and superfluid. Predicted 50 years ago, such a counter-intuitive phase, featuring...

Im Focus: Explosion on Jupiter-sized star 10 times more powerful than ever seen on our sun

A stellar flare 10 times more powerful than anything seen on our sun has burst from an ultracool star almost the same size as Jupiter

  • Coolest and smallest star to produce a superflare found
  • Star is a tenth of the radius of our Sun
  • Researchers led by University of Warwick could only see...

Im Focus: Quantum simulation more stable than expected

A localization phenomenon boosts the accuracy of solving quantum many-body problems with quantum computers which are otherwise challenging for conventional computers. This brings such digital quantum simulation within reach on quantum devices available today.

Quantum computers promise to solve certain computational problems exponentially faster than any classical machine. “A particularly promising application is the...

Im Focus: Largest, fastest array of microscopic 'traffic cops' for optical communications

The technology could revolutionize how information travels through data centers and artificial intelligence networks

Engineers at the University of California, Berkeley have built a new photonic switch that can control the direction of light passing through optical fibers...

Im Focus: A long-distance relationship in femtoseconds

Physicists observe how electron-hole pairs drift apart at ultrafast speed, but still remain strongly bound.

Modern electronics relies on ultrafast charge motion on ever shorter length scales. Physicists from Regensburg and Gothenburg have now succeeded in resolving a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Revered mathematicians and computer scientists converge with 200 young researchers in Heidelberg!

17.04.2019 | Event News

First dust conference in the Central Asian part of the earth’s dust belt

15.04.2019 | Event News

Fraunhofer FHR at the IEEE Radar Conference 2019 in Boston, USA

09.04.2019 | Event News

 
Latest News

Marine Skin dives deeper for better monitoring

23.04.2019 | Information Technology

Geomagnetic jerks finally reproduced and explained

23.04.2019 | Earth Sciences

Overlooked molecular machine in cell nucleus may hold key to treating aggressive leukemia

23.04.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>