Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

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 Umeċ 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

Umeċ, 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 Ċ due to incorporation of additional ethanol into its structure, compared to approximately 3.4 Ċ in natural graphite and approximately 6.5 Ċ 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

Building a smart cardiac patch: 'Bionic' cardiac patch could one day monitor and respond to cardiac problems June 28th, 2016

New, better way to build circuits for world's first useful quantum computers June 28th, 2016

Yale researchers’ technology turns wasted heat into power June 27th, 2016

FEI Launches Helios G4 DualBeam Series for Materials Science: The Helios G4 DualBeam Series features new capabilities to enable scientists and engineers to answer the most demanding and challenging scientific questions June 27th, 2016

Chemistry

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Quantum calculations broaden the understanding of crystal catalysts: Quantum mechanics and a supercomputer help scientists to identify the position of atoms on the surface of rutile June 22nd, 2016

Droplets finally all the same size -- in a nanodroplet library June 20th, 2016

Graphene/ Graphite

GraphExeter illuminates bright new future for flexible lighting devices June 23rd, 2016

A new form of hybrid photodetectors with quantum dots and graphene June 19th, 2016

Discoveries

Building a smart cardiac patch: 'Bionic' cardiac patch could one day monitor and respond to cardiac problems June 28th, 2016

New, better way to build circuits for world's first useful quantum computers June 28th, 2016

Yale researchers’ technology turns wasted heat into power June 27th, 2016

Superheroes are real: Ultrasensitive nonlinear metamaterials for data transfer June 25th, 2016

Announcements

Building a smart cardiac patch: 'Bionic' cardiac patch could one day monitor and respond to cardiac problems June 28th, 2016

New, better way to build circuits for world's first useful quantum computers June 28th, 2016

Yale researchers’ technology turns wasted heat into power June 27th, 2016

FEI Launches Helios G4 DualBeam Series for Materials Science: The Helios G4 DualBeam Series features new capabilities to enable scientists and engineers to answer the most demanding and challenging scientific questions June 27th, 2016

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

Building a smart cardiac patch: 'Bionic' cardiac patch could one day monitor and respond to cardiac problems June 28th, 2016

New, better way to build circuits for world's first useful quantum computers June 28th, 2016

Yale researchers’ technology turns wasted heat into power June 27th, 2016

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Water

Mille-feuille-filter removes viruses from water May 19th, 2016

First single-enzyme method to produce quantum dots revealed: Biological manufacturing process, pioneered by three Lehigh University engineers, produces equivalent quantum dots to those made chemically--but in a much greener, cheaper way May 9th, 2016

Understanding tiny droplets can make for better weather forecasts: Climate change models also benefit from understanding fundamental thermodynamics of water droplets May 6th, 2016

Engineers create a better way to boil water -- with industrial, electronics applications May 5th, 2016

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







Car Brands
Buy website traffic