Graphene Oxide News
Researchers from Australia and Ireland developed a flexible yarn made from graphene oxide. This strong, lightweight, highly conductive and high capacitance fiber may be a great material for wearable textiles.
The researchers report that the new yarns and fibers exhibit the best electrochemical capacitance ever - of as high as 410 F/g. To create the fiber, the researchers used a novel wet-spinning technique that can produce both GO and r-GO yarns of unlimited lengths. Those yarns are strong (with a Young’s modulus that is greater than 29 GPa), have a high electrical conductivity of around 2500 S/m and a very large surface area – about 2600 m2/g for graphene oxide and 2210 m2/g for the reduced material.
Graphene Batteries reportedly tested over 50 types of graphite before choosing GSI's graphite. GSI is offering high quality natural graphite at $16,000 per ton. GS International, together with the RS Group also aims to become a research partner to Graphene Batteries. The GS Group and GSI also plans to scale-up Graphene Oxide production soon.
Researchers from the University of Pittsburgh and the Qingdao University of Science and Technology are studying drug delivery systems based on graphene oxide nanocomposite films. They found a way to consistently release anti-inflammatory drugs by applying electricity. Such a technique can be useful to treat epilepsy for example - when medication is "waiting inside the body" and will only be released when a seizure starts.
The researchers are using polymer thin films covered with GO nanosheets. They then coat it with an anti-inflammatory drug. This structure is then coated on an electrode. Applying electric current to the electrode causes it to release the drug. By changing the size and thickness of the GO sheets, the researchers can control how much drug is carried.
Researchers from Nanyang Technological University in Singapore demonstrated how Indium and Indium chloride (InCl) can be improve the process of reducing graphene oxide to graphene. The Indium helps by regenerating the sp2-conjugated system or selectively removing key oxygen-containing groups that could potentially decrease the performance of the graphene.
The researchers developed a method to apply the Indium, and they say that this method can be applied independently or in conjunction with other reducing agents to further improve the quality of chemically reduced graphene.
Back in October, researchers from India's VIT University started to study a new composite material made from graphene oxide and PVC. The GO was found to enhance the PVC to make it useful for battery electrodes, membranes and coatings.
The researchers continued to study the material, and they now published an article regarding the electrical characterization of the PVC-GO material as function of temperature. They say that according to their findings, the new material be very useful for all sorts of EMI applications, including radiation shields for radar and communication towers.
The University of Central Florida’s NanoScience Technology Center is developing graphene-based spray coating. The spray will be based on a polymer-graphene composite that will both be used to strengthen materials (used for the construction of aircrafts and cars) and to protect materials from corrosion.
The Center launched a program that will develop graphene oxide, the plastic host and a plasma spray. Garmor (which was spun off the UCF and licensed technology developed at the NanoScience Center) will assist with the formulation of the graphene oxide. The GO will need to be modified so it can be adhered to a plastic host and sprayed onto a surface while retaining its innate strength and elasticity.
Researchers from Korea developed a new skin cancer photothermal therapy using graphene oxide. The idea is to attach the GO particles to tumor cells, and then shine near-infrared laser light on them. The GO generate heat (and destroy the tumor cells) when exposed to the light, while healthy cells are not effected. Graphene is more efficient than gold for converting the light into heat, and it's also cheaper.
The researcher coupled the graphene with hyaluronic acid, a sugar polymer that is found naturally in skin and is an ingredient in skin care products. The polymer can penetrate the skin’s top layer, and tumor cells are known to express a large number of hyaluronic acid receptors on their surfaces. So this coupling allows the researchers to apply the graphene oxide particles to the skin, avoiding the need to inject them.