Graphene thermal conductivity - introduction and latest news - Page 20
Graphene coating enables CNT growth on normally unsuitable substrates
Researchers from Rice University and the Honda Research Institute USA found that using graphene coating may enable carbon nanotube (CNT) growth on substrates which are normally unsuitable for this task.
A diamond for example conducts heat very well (five times better than copper) but it has a very low available surface area. Coating diamonds with graphene enables the growth of vertically aligned CNTs on the diamond - which creates a very efficient heat sink.
Grafoid and CapTherm to jointly develop and commercialize EV and LED cooling systems
Grafoid signed a joint-venture development agreement with CapTherm Systems to develop and commercialize next generation, multiphase thermal management systems for electric vehicle (EV) batteries and LEDs. Grafoid will supply graphene materials and the technology needed to adapt graphene to CapTherm's existing EV and LED cooling systems.
CapTherm says that graphene's lateral and vertical heat spreading capabilities will enable them to develop more competitive products.
XG Sciences and the ORNL to develop a titanium-graphene composite
XG Sciences announced that it had launched a joint program with Oak Ridge National Laboratory (ORNL) to develop a titanium-graphene composite using an advanced powder metallurgy manufacturing process.
Titanium is light, strong and corrosion resistant - and is useful in many industrial, commercial, and military applications. The problem is that it has low thermal conductivity. The programs aims to solve this issue by adding graphene - which has excellent thermal conductivity. In this collaboration, XG Sciences has the capability to mass-produce graphene nanoplatelets in high volume, while ORNL has unique capabilities for low-temperature powder metal processing.
Angstron Materials developed a new graphene-modified lubricant
Angstron Materials developed a new graphene-modified lubricant, and has been awarded a US patent for the material (US #8,222,190). The material is made by dispersing single-layer nano graphene platelets (NGPs) at a weight ratio of 0.001% to 60% (based on total fluid weight) in a fluid containing a petroleum or synthetic oil.
Angstron has demonstrated the ability of the new lubricant to provide improved thermal conductivity and friction reduction. These characteristics help extend wear performance. In addition to exceptional viscosity stability, the thermal conductivity values for the NGP-modified fluid are the highest on record for fluid materials.
Graphene and Supercapacitors - guest article by Olan Dantes
Here's a guest article that Olan Dantes from Farnell sent us, regarding Graphene and Super Capacitors:
Electronic devices can become smaller and smaller to the point that it becomes invisible to the naked eye. But no matter what size they can have, they will still produce a lot of heat. The interconnecting wires as well as the multitude of transistors inside these devices at nano and micro scales are more than capable of creating heat spots. There could have been nothing wrong with the produced heat if it didn't induce damage.
Graphene used as a transparent conducting layer for UV LEDs
Researchers from Korea and the USA developed a Ultraviolet nitride (UV) LED that uses a few layers of graphene as a transparent conducting layer. They say that Graphene may prove better than the currently-used ITO as it performs better in terms of cost, transparency, and, heat and current spreading. Graphene also sports improved transmission in the ultraviolet.
Graphene however suffers from reliability and degradation issues that must be further investigated.
Graphene Oxide: A Hands-on Guide to Practical Applications
The following article was sent to us by Corey McCarren and Dr. Elena Polyakova from Graphene Laboratories (a Graphene-Info sponsor), discussing Graphene Oxide and its applications:
Graphene, a multi or single layer sheet of graphite, is considered a key material in producing the next generation of low-cost carbon-based transparent and flexible electronics. Graphene is the strongest material available, as well as being highly transparent, flexible, and the best conductor of heat and electricity. Great effort is devoted to developing an effective yet inexpensive way to produce graphene materials in industrial quantities.
IBM researchers develop a 155 Ghz graphene transistor using a diamond-like carbon substrate
Researchers from IBM developed a graphene transistor with a record cut-off frequency of 155 Ghz and the shortest gate length ever (just 40nm). They used a diamond-like carbon as the top layer of the substrate on which the Graphene is deposited. This material is a great substrate for Graphene. It's a non-polar dielectric material - so it does not 'trap' or scatter charges, doesn't absorb a lot of water and has excellent thermal conductivity. It's also cheap to make and widely used today in the semiconductor industry.
Just over a year ago, IBM developed a 100Ghz RF graphene transistor - so the recent development is a 50% improvement over the previous design.
Researchers discover that acoustic waves traveling along graphene can remove heat
Researchers from Rice University has used theoretical models to determine that graphene can transmit thermal energy in waves. Given the elastic properties of graphene, long waves of the acoustic kind seem to work best. Because the scattering properties of graphene are low, such waves can go fast and far, unobstructed by each other or by imperfections in the material.
Angstron awarded $1.5 Million to develop Nano Graphene Platelets
Angstron Materials announced that they have been awarded a $1.494 million project to develop processes for mass-producing chemically modified (functionalized) Nano Graphene Platelets (NGP) for a nearly limitless number of applications in the aerospace, energy, defense, automotive and telecommunications markets. Angstron was selected for the award by the U.S. Commerce Department’s National Institute of Standards and Technology (NIST).
Angstron developed NGPs as an alternative to carbon nanotubes, which are difficult to disperse in plastic and often have purity issuesânot to mention the cost factor. NGPs have been shown to have striking material properties; among other things, it has the highest intrinsic strength and the highest thermal conductivity of all existing materials as well as exceptional in-plane electrical conductivity (up to ~ 20,000 S/cm)and electron mobility that is 100 times faster than silicon.
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