Subscribe free to our newsletters via your
. 24/7 Space News .




Subscribe free to our newsletters via your




















CARBON WORLDS
Boron nitride foam soaks up carbon dioxide
by Staff Writers
Houston TX (SPX) Aug 21, 2017


A microscope image shows the high surface area of hexagonal-boron nitride foam glued together with polyvinyl alcohol. The tough, light foam can be used to soak up carbon dioxide or as a material to shield biological tissues from lasers. Credit Ajayan Research Group/Rice University

Rice University materials scientists have created a light foam from two-dimensional sheets of hexagonal-boron nitride (h-BN) that absorbs carbon dioxide.

They discovered freeze-drying h-BN turned it into a macro-scale foam that disintegrates in liquids. But adding a bit of polyvinyl alcohol (PVA) into the mix transformed it into a far more robust and useful material.

The foam is highly porous and its properties can be tuned for use in air filters and as gas absorption materials, according to researchers in the Rice lab of materials scientist Pulickel Ajayan.

Their work appears in the American Chemical Society journal ACS Nano.

The polyvinyl alcohol serves as a glue. Mixed into a solution with flakes of h-BN, it binds the junctions as the microscopic sheets arrange themselves into a lattice when freeze-dried. The one-step process is scalable, the researchers said.

"Even a very small amount of PVA works," said co-author and Rice postdoctoral researcher Chandra Sekhar Tiwary. "It helps make the foam stiff by gluing the interconnects between the h-BN sheets - and at the same time, it hardly changes the surface area at all."

In molecular dynamics simulations, the foam adsorbed 340 percent of its own weight in carbon dioxide. The greenhouse gas can be evaporated out of the material, which can be reused repeatedly, Tiwary said. Compression tests showed the foam got stiffer through 2,000 cycles as well.

And when coated with PDMS, another polymer, the foam becomes an effective shield from lasers that could be used in biomedical, electronics and other applications, he said.

Ultimately, the researchers want to gain control over the size of the material's pores for specific applications, like separating oil from water. Simulations carried out by co-author Cristiano Woellner, a joint postdoctoral researcher at Rice and the State University of Campinas, Brazil, could serve as a guide for experimentalists.

"It's important to join experiments and theoretical calculations to see the mechanical response of this composite," Woellner said. "This way, experimentalists will see in advance how they can improve the system."

Research paper

CARBON WORLDS
Flourine lends white graphene new qualities
Washington (UPI) Jul 14, 2017
With just a bit of fluorine, white graphene becomes a wide-bandgap semiconductor with magnetic properties. The new material could be used in electronics designed to perform under extreme conditions. White graphene is a two-dimensional atomic sheet of hexagonal boron nitride. Its hexagonal structure is similar to that of regular graphene, but the atomic layer is made up of boron nitride, ... read more

Related Links
Rice University
Carbon Worlds - where graphite, diamond, amorphous, fullerenes meet

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

CARBON WORLDS
NASA launches latest TDRS communications satellite

Turning human waste into plastic, nutrients could aid long-distance space travel

NASA Offers Space Station as Catalyst for Discovery in Washington

System tests prepare Orion for deep space exploration

CARBON WORLDS
The Phantom Lunar Dragon

Equipment for Angara heavy-class rocket arrives at Vostochny Cosmodrome

Soyuz-2 Rocket to Arrive at Vostochny on September 20 for November Launch

ISRO Develops Ship-Based Antenna System to Track Satellite Launches

CARBON WORLDS
The Moving Martian Bow Shock

Mars weather: 'Cloudy, chance of nighttime snowstorm'

Mars 2020 mission to use smart methods to seek signs of past life

For Moratorium on Sending Commands to Mars, Blame the Sun

CARBON WORLDS
China's satellite sends unbreakable cipher from space

Xian Satellite Control Center resolves over 10 major satellite faults in 50 years

China develops sea launches to boost space commerce

Chinese satellite Zhongxing-9A enters preset orbit

CARBON WORLDS
Bids for government funding prove strong interest in LaunchUK

ASTROSCALE Raises a Total of $25 Million in Series C Led by Private Companies

LISA Pathfinder: bake, rattle and roll

Blue Sky Network Reaffirms Commitment to Brazilian Market

CARBON WORLDS
The critical point in breaking the glass problem

Researchers use vacuum for hands-free patterning of liquid metal

Surprise discovery in the search for energy efficient information storage

NASA protects its super heroes from space weather

CARBON WORLDS
Earth-like planet in star system only 16 light years away

A New Search for Extrasolar Planets from the Arecibo Observatory

Gulf of Mexico tube worm is one of the longest-living animals in the world

Molecular Outflow Launched Beyond Disk Around Young Star

CARBON WORLDS
New Horizons Video Soars over Pluto's Majestic Mountains and Icy Plains

Juno spots Jupiter's Great Red Spot

New evidence in support of the Planet Nine hypothesis

Scientists probe Neptune's depths to reveal secrets of icy planets




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement