Navigation Links
Liquid method: pure graphene production
Date:5/30/2010

HOUSTON -- (May 30, 2010) -- In a development that could lead to novel carbon composites and touch-screen displays, researchers from Rice University and the Technion-Israel Institute of Technology today unveiled a new method for producing bulk quantities of one-atom-thick sheets of carbon called graphene.

The research is available online in the journal Nature Nanotechnology.

When stacked together, graphene sheets make graphite, which has been commonly used as pencil lead for hundreds of years. It wasn't until 2004 that stand-alone sheets of graphene were first characterized with modern nanotechnological instruments. Since then, graphene has come under intense scrutiny from materials scientists, in part because it is both ultrastrong and highly conductive.

"There are high-throughput methods for making graphene oxide, which is not as conductive as graphene, and there are low-throughput methods for making pure graphene," said lead co-author Matteo Pasquali, professor of chemical and biomolecular engineering and chemistry at Rice. "Our method yields very pure material, and it is based on bulk fluid-processing techniques that have long been used by the chemical industry."

Pasquali said the research team found it could dissolve graphite in chlorosulphonic acid, a common industrial solvent. The researchers had to devise new methods to measure the aggregation of the dissolved graphene flakes, but at the end the team was pleasantly surprised to find that the individual graphene layers in the graphite peeled apart spontaneously. The team was able to dissolve as much as two grams of graphene per liter of acid to produce solutions at least 10 times more concentrated than existing methods.

The researchers took advantage of novel cryogenic techniques for electron microscopy that allowed them to directly image the graphene sheets in the chlorosulfonic acid.

"We applied new methods that we had developed to directly image carbon nanotubes in acid," said co-author Yeshayahu "Ishi" Talmon, professor of chemical engineering at the Technion-Israel Institute of Technology. "This was no small feat considering the nature of the acid and the difficulty of specimen preparation and imaging."

Using the concentrated solutions of dissolved graphene, the scientists made transparent films that were electrically conductive. Such films could be useful in making touch screens that are less expensive than those used in today's smart phones. In addition, the researchers also produced liquid crystals.

"If you can make liquid crystals, you can spin fibers," said study co-author James Tour, Rice's T.T. and W.F. Chao Professor of Chemistry. "In liquid crystals, the individual sheets align themselves into domains, and having some measure of alignment allows you to flow the material through narrow openings to create fibers."

If the method proves useful for making graphene fibers in bulk, it could drive down the cost of the ultrastrong carbon composites used in the aerospace, automotive and construction industries.


'/>"/>

Contact: Jade Boyd
jadeboyd@rice.edu
713-348-6778
Rice University
Source:Eurekalert

Related biology technology :

1. AutoImmune Inc. Announces Shareholder Approval of Plan of Complete Liquidation and Dissolution
2. Water Filtration and Liquid Separation Training by the American Filtration and Separations Society.
3. Mescal worm test shows DNA leaks into preservative liquids
4. Genaera Liquidating Trust To Sell Remaining Proprietary Assets
5. New Constant Diameter NeedleProbes™ with Unique Ability to Measure Liquid Surface Properties by AFM
6. 0.2 second test for explosive liquids
7. Los Gatos Research Introduces Second Generation Liquid-Water Isotope Analyzer
8. Pharmacy Compounds Liquid Mupirocin for the Chronic Sinusitis Patient
9. 4th BTLtec Conference on 24-25 Sep in Graz, Austria features Biomass to Liquids Innovators Sharing Updates on Pyrolysis and Gasification Technologies, Syngas Application, BTL Value Chain and a Site Visit to the Biomass CHP Gussing Plant.
10. TransTech Services Partners, Inc. Shareholders Approve Plan of Liquidation; Company To Distribute Amounts in Trust
11. Ganeden Biotech, Liquid Health Labs Unveil New Drink Technology
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/5/2016)... (PRWEB) , ... May 05, 2016 , ... ... the previously announced identification of its first three targets, it has identified a ... Amyloid beta (Aß), implicated in the development and progression of Alzheimer’s disease (AD). ...
(Date:5/4/2016)... ... May 04, 2016 , ... Proove Biosciences, Inc. , the commercial and ... McGill University . The partnership is designed to advance research in pain genetics ... patients in pain. With the new agreement, researchers at Proove Biosciences are able to ...
(Date:5/4/2016)... York , May 4, 2016 ... Transparency Market Research "Metabolomics Market - Global Industry Analysis, ... the metabolomics market is anticipated to expand at a ... USD 2,494.8 million by 2024. Metabolomics is ... metabolites, within cells, biofluids, tissues or organisms. Together, these ...
(Date:5/3/2016)... May 3, 2016 ... Drug Discovery, Gene Expression) Lab-on-a-chip (IVD & ... Institutes, Diagnostics Centers), Fabrication Technology (Microarrays, Microfluidics) ... the market is expected to reach USD ... Billion in 2015, growing at a CAGR ...
Breaking Biology Technology:
(Date:3/3/2016)... , March 3, 2016  FlexTech, a SEMI ... categories of Innovation, Research & Development, Leadership in Education, ... This is the 9 th year of the ... of companies and individuals from past years . ... on a pre-described set of criteria, by a panel ...
(Date:3/3/2016)... and DE SOTO, Kansas , March ... Detection Plus® to offer Oncimmune,s Early CDT®-Lung, a ... early detection of lung cancer Early CDT®-Lung ... and individuals. --> Early CDT®-Lung test to ... --> Oncimmune, a leader in early cancer ...
(Date:3/2/2016)... 2016 http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) ... "Global Biometrics as a Service Market 2016-2020" ... --> http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) has announced the ... a Service Market 2016-2020" report to ... and Markets ( http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) has announced ...
Breaking Biology News(10 mins):