Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Gas gives laser-induced graphene super properties: Rice University study shows inexpensive material can be superhydrophilic or superhydrophobic

Superhydrophobic (water-avoiding) laser-induced graphene created in the presence of argon gas could be useful for de-icing applications or separating water and oil. (Credit: Tour Group/Rice University)
Superhydrophobic (water-avoiding) laser-induced graphene created in the presence of argon gas could be useful for de-icing applications or separating water and oil. (Credit: Tour Group/Rice University)

Abstract:
Rice University scientists who invented laser-induced graphene (LIG) for applications like supercapacitors have now figured out a way to make the spongy graphene either superhydrophobic or superhydrophilic. And it's a gas.



Water rolls off a superhydrophilic laser-induced graphene pattern placed inside a superhydrophobic LIG frame.

(Credit: Tour Group/Rice University)



A water droplet bounces on the surface of laser-induced graphene with a sulfur and fluorine gas in the chamber.

(Credit: Tour Group/Rice University)

Gas gives laser-induced graphene super properties: Rice University study shows inexpensive material can be superhydrophilic or superhydrophobic

Houston, TX | Posted on May 15th, 2017

Until recently, the Rice lab of James Tour made LIG only in open air, using a laser to burn part of the way through a flexible polyimide sheet to get interconnected flakes of graphene. But putting the polymer in a closed environment with various gases changed the product's properties.

Forming LIG in argon or hydrogen makes it superhydrophobic, or water-avoiding, a property highly valued for separating water from oil or de-icing surfaces. Forming it in oxygen or air makes it superhydrophilic, or water-attracting, and that makes it highly soluble.

The research at Rice and at Ben-Gurion University in Israel is the subject of a paper in Advanced Materials.

"Labs could make graphene either hydrophobic or hydrophilic before, but it involved multiple steps of either wet-chemical or chemical vapor deposition processes," Tour said. "We're doing this in one step with relatively cheap materials in a homemade atmosphere chamber."

The labs got a bonus when they discovered that fabricating LIG in oxygen increased the number of defects – 5- and 7-atom rings – in the graphene flakes, improving its capacitance and its performance when used as an electrode material for microsupercapacitors.

Changes in the chemical content of the gas and even changes in the direction of the laser raster pattern altered the material, leading the researchers to believe LIG's hydrophobic or –philic properties could be tuned.

They also discovered when they scraped graphene off of a hydrophilic sheet of polymer and turned it into a film, the result was hydrophobic instead. "That leads us to believe the surface orientation of LIG's flakes have a lot to do with how it reacts with water," Tour said. "If the edges are more exposed, it appears to be hydrophilic; if the basal planes are more exposed, their hydrophobic properties take over."

What makes a material "super" in either direction is the angle at which it encounters water. A material with a contact angle of 0 degrees is considered superhydrophilic. In this case, water would lay on the material in a puddle. If the angle is 150 degrees or more, that's superhydrophobic; the angle is determined by how much the water beads. (An angle of 180 degrees would be a sphere sitting perfectly on top of LIG.)

The discovery that surface type and chemistry affect LIG should also allow some leeway in adjusting the material's properties, Tour said. In fact, when they used a sulfur/fluorine gas to make it, they raised LIG's superhydrophobicity to 160 degrees.

Yilun Li, a graduate student at Rice, is lead author of the paper. Co-authors are Rice graduate students Duy Xuan Luong and Jibo Zhang, undergraduate Yash Tarkunde, research scientist Carter Kittrell and former postdoctoral researcher Yongsung Ji; and graduate student Franklin Sargunaraj and co-principal investigator Christopher Arnusch, a lecturer at the Zuckerberg Institute for Water Research at Ben Gurion University of the Negev, Israel. Tour is the T.T. and W.F. Chao Chair in Chemistry as well as a professor of computer science and of materials science and nanoengineering at Rice.

The Air Force Office of Scientific Research and its Multidisciplinary University Research Initiative and the Vietnam Education Foundation supported the research.

####

About Rice University
Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation’s top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute for Public Policy. With 3,879 undergraduates and 2,861 graduate students, Rice’s undergraduate student-to-faculty ratio is 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice is ranked No. 1 for happiest students and for lots of race/class interaction by the Princeton Review. Rice is also rated as a best value among private universities by Kiplinger’s Personal Finance. To read “What they’re saying about Rice,” go to http://tinyurl.com/RiceUniversityoverview .

Follow Rice News and Media Relations via Twitter @RiceUNews

For more information, please click here

Contacts:
Jeff Falk
713-348-6775


Mike Williams
713-348-6728

Copyright © Rice University

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 Links

Read the abstract at:

Tour Group:

Arnusch Laboratory:

Wiess School of Natural Sciences:

Related News Press

Graphene/ Graphite

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Scientists produce dialysis membrane made from graphene: Material can filter nanometer-sized molecules at 10 to 100 times the rate of commercial membranes June 29th, 2017

Rice U. chemists create 3-D printed graphene foam June 22nd, 2017

News and information

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Liquid electrolyte contacts for advanced characterization of resistive switching memories July 26th, 2017

Phenom-World Launches Phenom Pro and ProX Generation 5 SEMs at Microscopy & Microanalysis Conference USA: The excellent performance in a wide range of applications offers a serious alternative to floor model SEMs July 26th, 2017

Graduate Students from Across the Country Attend Hands-on NanoCamp: Prominent scientists Warren Oliver, Ph.D., and George Pharr, Ph.D., presented a weeklong NanoCamp for hand-picked graduate students across the United States July 26th, 2017

Videos/Movies

Nanotech Advances Future Mobile Devices and Wearable Technology July 5th, 2017

ANU invention may help to protect astronauts from radiation in space July 3rd, 2017

Govt.-Legislation/Regulation/Funding/Policy

Graduate Students from Across the Country Attend Hands-on NanoCamp: Prominent scientists Warren Oliver, Ph.D., and George Pharr, Ph.D., presented a weeklong NanoCamp for hand-picked graduate students across the United States July 26th, 2017

Ultrathin device harvests electricity from human motion July 23rd, 2017

The first light atomic nucleus with a second face July 20th, 2017

Semiliquid chains pulled out of a sea of microparticles July 20th, 2017

Possible Futures

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Liquid electrolyte contacts for advanced characterization of resistive switching memories July 26th, 2017

Graduate Students from Across the Country Attend Hands-on NanoCamp: Prominent scientists Warren Oliver, Ph.D., and George Pharr, Ph.D., presented a weeklong NanoCamp for hand-picked graduate students across the United States July 26th, 2017

Shining rings: A new material emits white light when exposed to electricity: New synthetic approach could spark development of other dynamic materials July 24th, 2017

Discoveries

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Liquid electrolyte contacts for advanced characterization of resistive switching memories July 26th, 2017

Shining rings: A new material emits white light when exposed to electricity: New synthetic approach could spark development of other dynamic materials July 24th, 2017

Scientists announce the quest for high-index materials: All-dielectric nanophotonics: The quest for better materials and fabrication techniques July 22nd, 2017

Announcements

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Liquid electrolyte contacts for advanced characterization of resistive switching memories July 26th, 2017

Phenom-World Launches Phenom Pro and ProX Generation 5 SEMs at Microscopy & Microanalysis Conference USA: The excellent performance in a wide range of applications offers a serious alternative to floor model SEMs July 26th, 2017

Graduate Students from Across the Country Attend Hands-on NanoCamp: Prominent scientists Warren Oliver, Ph.D., and George Pharr, Ph.D., presented a weeklong NanoCamp for hand-picked graduate students across the United States July 26th, 2017

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

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Liquid electrolyte contacts for advanced characterization of resistive switching memories July 26th, 2017

Shining rings: A new material emits white light when exposed to electricity: New synthetic approach could spark development of other dynamic materials July 24th, 2017

Ultrathin device harvests electricity from human motion July 23rd, 2017

Military

Nanoparticles could spur better LEDs, invisibility cloaks July 19th, 2017

'Upconverted' light has a bright future: Rice University professor developing plasmon-powered devices for medicine, security, solar cells July 17th, 2017

Nature-inspired material uses liquid reinforcement: Rice U. nanoengineers create liquid-solid composites using clues from nature July 11th, 2017

Meniscus-assisted technique produces high efficiency perovskite PV films July 7th, 2017

Battery Technology/Capacitors/Generators/Piezoelectrics/Thermoelectrics/Energy storage

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Ultrathin device harvests electricity from human motion July 23rd, 2017

Argonne National Laboratory’s Continuous ALD Technology Licensed Exclusively to Forge Nano July 7th, 2017

Nanotech Advances Future Mobile Devices and Wearable Technology July 5th, 2017

Grants/Sponsored Research/Awards/Scholarships/Gifts/Contests/Honors/Records

Here's a tip: Indented cement shows unique properties: Rice University models reveal nanoindentation can benefit crystals in concrete July 20th, 2017

National Space Society Governor Scott Pace Named to National Space Council as Executive Secretary July 18th, 2017

Researchers revolutionize vital conservation tool with use of gold nanotechnology and lasers: Cryopreservation study results have sweeping implications for wildlife conservation and human health July 15th, 2017

Nature-inspired material uses liquid reinforcement: Rice U. nanoengineers create liquid-solid composites using clues from nature July 11th, 2017

Photonics/Optics/Lasers

Scientists announce the quest for high-index materials: All-dielectric nanophotonics: The quest for better materials and fabrication techniques July 22nd, 2017

Nanoparticles could spur better LEDs, invisibility cloaks July 19th, 2017

'Upconverted' light has a bright future: Rice University professor developing plasmon-powered devices for medicine, security, solar cells July 17th, 2017

Researchers revolutionize vital conservation tool with use of gold nanotechnology and lasers: Cryopreservation study results have sweeping implications for wildlife conservation and human health July 15th, 2017

Research partnerships

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Studying Argon Gas Trapped in Two-Dimensional Array of Tiny "Cages": Understanding how individual atoms enter and exit the nanoporous frameworks could help scientists design new materials for gas separation and nuclear waste remediation July 17th, 2017

Coupling a nano-trumpet with a quantum dot enables precise position determination July 14th, 2017

GLOBALFOUNDRIES and VeriSilicon To Enable Single-Chip Solution for Next-Gen IoT Networks: Integrated solution leverages GF’s 22FDX® technology to decrease power, area, and cost for NB-IoT and LTE-M applications July 14th, 2017

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