Graphene videos - Page 9

SciShow published this short fun video explaining all about graphene. It's actually quite good and well worth a watch:

Graphene Frontier, spun off from the University of Pennsylvania, is producing graphene using their own Atmospheric Pressure CVD (APCVD) technology, a roll-to-roll process that does not require a vacuum. The company published a nice short video introducing the technology, with a focus on sensor applications.

In November 2013 I posted an article describing Graphene Frontier's technology and business following my talk with Michael D. Patterson, the company's CEO.

Researchers from the University of Maryland developed a technique to fold graphene squares into a "box", which opens and closes in response to an electric charge. The researchers packed hydrogen atoms into this "box" - and say that this is the most efficient hydrogen storage device ever - with a storage density of 9.5% hydrogen by weight. This outperforms the DoE's goal for 2020 (7.5%).

The researchers are now working to increase the density and say that they have already demonstrated an even higher density. This research was supported by the US NSF.

Researchers from Rice University in collaboration with Lockheed Martin developed a new graphene based compound that can be used as a deicing (ice protection) coating for marine and airborne radars.

Currently most radar domes use ceramic alumina for deicing, but it takes a lot of power to heat them if they are coated with ice because they are poor conductors. The new compound is based on graphene nano-ribbons (GNRs) and polyurethane car paint. The car paint helps the graphene stay on the radar dome.

Researchers from Rice University developed a simple method to reduce coal into graphene quantum dots (GQDs). Different types of coal produce differently-sized quantum dots (ranging from 2 to 20 nanometers). The yield is also very good - about 20% of the coal can be turned into GQDs. Those GQDs are water-soluble and non toxic (according to early tests).

This is a chemical method - the coal is crushed and than soaked in acid solutions (nitric and sulfuric acids) for 24 hours. This breaks the bonds that hold the tiny GQDs together.

The University of Cambridge released (this was towards the end of August 2013, but I just found it now) a video showing sample transparent graphene electrodes based device prototypes:

In the video you can see a graphene touch panel used in a simple digital piano application, and also a flexible transparent display. The keyboard device is simple - when you touch the graphene electrode, the electrical charge changes which is detected by a simple electronic circuit-board connected to a speaker.

Back in May, Lomiko Metals, Stony Brook University (SBU) and Graphene Labs signed an agreement to investigate graphene based applications - mainly supercapacitors and batteries. Here's Lomiko Metals' CEO, Paul Gill explaining the company's graphite and graphene developments, especially regarding this project:

Graphene Labs recently managed to turn Lomiko Metals' graphite into Graphene Oxide, and then turn that GO into reduced-GO (r-GO). The supercapacitor research at SBU will be based on this r-GO material.

China's Nanjing JCNano developed a new one-step-transfer graphene. The company reports that these new films are easy to use and they avoid any glue etching cleaning steps. The new films can be clipped freely and can be used conveniently.

In the (somewhat relaxed) video above, you can see how the new graphene film is transferred. Water is dropped on one side, and then when placed in water, the graphene just floats away.

Graphen Laboratories has become Moorfield's exclusive US distributer for their nanoCVD systems. Those new systems (launched in Europe in early 2013) enable easy, R&D scale production of CVD graphene and carbon nanotubes on a variety of substrates. The systems will be distributed by Graphene Laboratories via Graphene Supermarket.

The nanoCVD range consists of compact yet powerful units which include features such as low thermal mass heater stages, cold-walled reaction chambers and fully automatic controls enable rapid synthesis. The primary focus of these systems is in the academic sector, but Moorfield says that the nanoCVD systems have also proven attractive for industrial product development.

Bluestone Global Tech released a new video showing a test of their Gratom-O product (a graphene film on PET). This flexible film's physical integrity and high conductivity remain completely in tact, even after 25,000 bending cycles:

Gratam-O is a large-area CVD graphene film on PET (it can also be transferred to customized substrates). It features low sheet resistance and high optical transmittance (over 97%).