Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > New findings on the structure of graphite oxides in alcohols

The graphite oxide immersed in water-methanol mixtures with methanol fraction 20-100 percent absorbs only methanol. The figure shows that the distance between the graphene oxide layers remains the same when water is added to methanol and start to increase only when the content of methanol goes below 15 percent.
The graphite oxide immersed in water-methanol mixtures with methanol fraction 20-100 percent absorbs only methanol. The figure shows that the distance between the graphene oxide layers remains the same when water is added to methanol and start to increase only when the content of methanol goes below 15 percent.

Abstract:
The structure of graphite oxide surprisingly expands when cooled in methanol or ethanol. Also, graphite oxide selectively absorbs methanol from water-methanol mixtures. Two new studies by physicists at Umeć University in Sweden, published in ACS Nano and J. Phys. Chem. C, respectively, provide knowledge on new properties of oxidized graphite and graphene.

New findings on the structure of graphite oxides in alcohols

Umeć, Sweden | Posted on February 6th, 2013

Graphene is a two dimensional material consisting of a single layer of carbon atoms arranged in a honeycomb structure. Graphene can be considered as a unique adsorbent material due to its extremely large surface area. One gram of graphene has a surface area comparable to a football field. This surface could be used for adsorption of gases and liquids, in applications for gas storage, extraction of pollutants from water, etc. However, the graphene is hydrophobic, which means that its surface repels water.

On the other hand, oxidation of graphene results in remarkable changes in its properties. Graphene oxide is hydrophilic and it is also easily soluble in water. A material composed of many stacked graphene oxide layers is called graphite oxide. It has many unique properties: it absorbs water and alcohols in large amounts, similar to clays that swell when water is added.

A new study by Alexandr V. Talyzin and his team reveals that graphite oxide is able to incorporate even more methanol and ethanol at low temperatures compared to room temperature. Its structure expands when cooled in an excess of liquid solvent. At -130 degrees Celsius the graphene oxide layers are separated by 20.4 Ć due to incorporation of additional ethanol into its structure, compared to approximately 3.4 Ć in natural graphite and approximately 6.5 Ć in solvent-free graphite oxide.

"The distance between graphene oxide layers at low temperatures is so large that it becomes a composite material with graphene oxide sheets separated by at least four monolayers of methanol or ethanol molecules. What is also remarkable is that this phenomenon is limited only to one specific type of graphite oxide and is not observed in another type studied. In fact, many different kinds of graphite oxide are known and now we start to understand how enormous the variations of their properties are. It is not just one material, it is a whole family of materials," says Alexandr V. Talyzin, researcher at the Department of Physics.

In a separate study published in J. Phys. Chem. C it was demonstrated that a certain type of graphite oxide can be used for selective absorption of methanol from water-methanol mixtures. A very simple prototype filtering experiment showed that when a water-methanol liquid mixture is passed through graphite oxide powder, some of the methanol is absorbed in the powder and the solution passing through contains more pure water.

"In the future we would like to design special membranes composed of graphene oxide layers, which can be used for separation of different solvents and purification of water. These first results help us to understand possible ways to make such membranes," says Alexandr V. Talyzin.

The first example of successful solvent separation effects was reported last year in a study by R.R. Nair et al. from a research team at Manchester University, lead by I.Grigorieva and Nobel Laureate A. Geim, famous for their research in the graphene field.

####

For more information, please click here

Contacts:
David Meyers
+46 (0)90- 786 98 95

Copyright © AlphaGalileo

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

Shujie You , Bertil Sundqvist , and Alexandr V. Talyzin : Enormous Lattice Expansion of Hummers Graphite Oxide in Alcohols at Low Temperatures. ACS Nano, Article ASAP. DOI: 10.1021/nn3051105:

Shujie You, Junchun Yu, Bertil Sundqvist, L. A. Belyaeva, Natalya V. Avramenko, Mikhail V. Korobov, and Alexandr V. Talyzin: Selective Intercalation of Graphite Oxide by Methanol in Water/Methanol Mixtures. J.Phys. Chem. C, Article ASAP. DOI: 10.1021/jp312756w:

Related News Press

News and information

Shaping the Future of Nanocrystals: Berkeley Lab Researchers Obtain First Direct Observation of Facet Formation in Nanocubes August 21st, 2014

Hiden Release New Gas Analysis Catalogue August 21st, 2014

Wyatt Technology’s 24th International Light Scattering Colloquium to Highlight Developments in Applications and Characterization of Nanoparticles August 21st, 2014

Water window imaging opportunity: A new theoretical study elucidates mechanisms that could help in producing coherent radiations, ultimately promoting high-contrast imaging of biological samples August 21st, 2014

Graphene

Graphene may be key to leap in supercapacitor performance August 20th, 2014

Ultrasonic Waves Applied in Production of Graphene Nanosheets August 20th, 2014

Graphene rubber bands could stretch limits of current healthcare, new research finds August 19th, 2014

New test reveals purity of graphene: Rice, Osaka scientists use terahertz waves to spot contaminants August 13th, 2014

Could hemp nanosheets topple graphene for making the ideal supercapacitor? August 12th, 2014

Chemistry

Production of Toxic Ion Nanosorbents with High Sorption Capacity in Iran August 17th, 2014

Scientists fold RNA origami from a single strand: RNA origami is a new method for organizing molecules on the nanoscale. Using just a single strand of RNA, this technique can produce many complicated shapes. August 14th, 2014

Discoveries

Shaping the Future of Nanocrystals: Berkeley Lab Researchers Obtain First Direct Observation of Facet Formation in Nanocubes August 21st, 2014

Water window imaging opportunity: A new theoretical study elucidates mechanisms that could help in producing coherent radiations, ultimately promoting high-contrast imaging of biological samples August 21st, 2014

Nanotechnology Helps Production of Super Adsorbent Polymers August 21st, 2014

Rice physicist emerges as leader in quantum materials research: Nevidomskyy wins both NSF CAREER Award and Cottrell Scholar Award August 20th, 2014

Announcements

Wyatt Technology’s 24th International Light Scattering Colloquium to Highlight Developments in Applications and Characterization of Nanoparticles August 21st, 2014

Ultra-short pulse lasers & Positioning August 21st, 2014

Malvern’s Dr Alan Rawle talks TLAs in plenary lecture at Particulate Systems Analysis conference August 21st, 2014

Water window imaging opportunity: A new theoretical study elucidates mechanisms that could help in producing coherent radiations, ultimately promoting high-contrast imaging of biological samples August 21st, 2014

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

Shaping the Future of Nanocrystals: Berkeley Lab Researchers Obtain First Direct Observation of Facet Formation in Nanocubes August 21st, 2014

Water window imaging opportunity: A new theoretical study elucidates mechanisms that could help in producing coherent radiations, ultimately promoting high-contrast imaging of biological samples August 21st, 2014

Nanotechnology Helps Production of Super Adsorbent Polymers August 21st, 2014

Newly-Developed Nanobiosensor Quickly Diagnoses Cancer August 20th, 2014

Water

Eco-friendly 'pre-fab nanoparticles' could revolutionize nano manufacturing: UMass Amherst team invents a way to create versatile, water-soluble nano-modules August 13th, 2014

PerkinElmer to Display Innovative Detection and Informatics Offerings at ACS National Meeting & Exposition Detection, Data Visualization and Analytics for Chemistry Professionals August 8th, 2014

A new way to make microstructured surfaces: Method can produce strong, lightweight materials with specific surface properties July 29th, 2014

Researchers Use Various Zinc Oxide Nanostructures to Boost Efficiency of Water Purification Process July 13th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE