Water trapped between graphene and a hydrophilic substrate may enable liquid storage and release applications

Researchers from the University of Osnabrück and the University of Duisburg-Essen have studied the hydration layers trapped between graphene and a hydrophilic substrate - when graphene is produced using exfoliation on a hydrophilic substrate. While it is possible to reduce that hydration layer (by heating it), the researchers demonstrated that it is principally impossible to completely drive this hydration layer out of the confined space.

This layer will always influence the properties of the graphene on top of it. The researchers further demonstrated that it is possible to accelerate and to control the reorganization of the water (by 2D Ostwald ripening) that is present within the first hydration layer. Using this method, one can create "nanoblisters" filled with condensed fluid water. These nanoblisters could actually be a very suitable candidates for both storage and release of chemicals in aqueous environment.

New method to measure the quality of exfoliated 2D and composite materials

Researchers from Italy's Institute of Organic Synthesis and Photoreactivity (ISOF) developed a new way to analyze the production process of 2D materials (such as BN or graphene). The new suggested process can be used for process control of 2D and composite materials produced via exfoliation.

The researchers explain that today there are many different methods and production processes used to produce graphene. But it is difficult today to compare the quality of these materials. The new suggested method may help to better understand these different materials and standardize their quality.

A regular kitchen blender can be used to make graphene flakes

Researchers from England and Ireland's Trinity College developed a method to produce graphene flakes using very simple equipment. The idea is to simply mix powdered graphite with N-methyl-pyrrolidone and then mix it in a blender at high speed. This results in graphene flakes which are about a nanometer thick and 100 nanometer long. This method actually work with a regular kitchen blender!

The researchers say that the blender blades separate the graphite into graphene sheets without damaging the 2D structure. During their experiments, they made several grams of the graphene material, but they say it can be scaled up to produce in ton quantities.

A new a hybrid graphene material may be useful for flexible supercapacitors

Researchers from the University of Texas and the University of Science and Technology of China developed a new graphene-like material (called VOPO4) that can be useful as a working electrode of flexible supercapacitors together with graphene.

VOPO4, which is less than 6 atoms, was developed by using a 2-2-propanol-assisted ultrasonic method to exfoliate bulk VOPO4·2H2O into VOPO4 nanosheets. The researchers created a hybrid graphene-VOPO4 sheet that achieves both high planar conductivity and better electrochemical performance compared to pure graphene.

Graphene Labs successfully managed to convert Lomiko Metal's Quatre Milles property graphite to graphene

Graphene Laboratories logoLomiko Metals logoGraphene Laboratories announced that they have successfully managed to convert Lomiko Metal's Quatre Milles property graphite to graphene. They have actually produced graphene oxide (GO) and reduced graphene oxide (RGO) samples. The companies hope that they will be able to create graphene materials on a larger scale and at a reduced price.

In the first step of the conversion process the natural graphite flakes were oxidized and turned into GO by modified Hummer's method. This resulted in a stable aqueous dispersion with concentration of 40 g/L. The GO was then converted into RGO, with a surface area of 500 m2 /g and an electrical conductivity 4 S/cm.