Graphene thermal conductivity

Researchers show that hydrodynamic electrons flow through materials without electrical resistance

Scientists from Israel's Weizmann Institute of Science, in collaboration with teams at Manchester University and UC Irvine,  have shown that an electronic fluid can flow through materials without any electrical resistance, thereby perfectly eliminating a fundamental source of resistance that forms the ultimate limit for ballistic electrons. This result could open the door to improved electronic devices that do not heat up as much as existing technologies.

When electrons flow in electrical wires, they lose part of their energy, which is wasted as heat. This heating is a major problem in everyday electronics. The heating occurs because electrical conductors are never perfect and have a resistance for the flow of electrical currents. Typically, this resistance originates from the scattering of the flowing electrons by imperfections in the host material. But it stands to reason that a perfect conductor, devoid of any imperfections, would have zero resistance. However, even if the conductor is perfectly clean and free from imperfections, the resistance does not vanish. Instead, a new source of resistance emerges, known as the Landauer-Sharvin resistance. In an electrical conductor, electrons flow in quantum channels, much like cars in highway lanes. Similar to highway lanes, each electronic channel has a finite capacity to conduct electrons, limited by the quantum of conductance. For a given conductor, the number of quantum channels is finite and determined by its physical width. Thus, even a perfect electronic device, devoid of any imperfections, will never have infinite conductance. It will always have resistance. In the absence of interactions between electrons, this Landauer-Sharvin resistance is unavoidable, putting a fundamental lower bound on the heating of computer chips, which becomes even more severe as transistors become smaller.

Read the full story Posted: Sep 14,2022

Directa Plus extends supply deal with Grassi for workwear market

Directa Plus has signed an extension to the commercial supply agreement with Alfredo Grassi to include Graphene Plus Thermal Planar Circuit for the workwear market in Italy and France.

The supply agreement will grant Grassi use of Directa's print textile technology for the workwear market in both countries for two years. The agreement is expected to give a significant boost to company's workwear income in 2022.

Read the full story Posted: Aug 05,2022

Researchers design non-volatile switches that manipulate light using phase-change materials and graphene heaters

A team of researchers from Stanford University, University of Washington, The Charles Stark Draper Laboratory, University of Maryland and MIT have reported the design of an energy-efficient, silicon-based non-volatile switch that manipulates light through the use of a phase-change material and graphene heater.

Data centers are dedicated spaces for storing, processing and disseminating data, that enable various applications, from cloud computing to video streaming. In the process, they consume a large amount of energy; As the need for data use grows, so does the need to make data centers more energy-efficient.

Read the full story Posted: Jul 09,2022

Enjoy 10% on WearGraphene's graphene-enhanced jacket

A couple of months ago WearGraphene sent us one of their Gamma graphene-enhanced jacket. We posted our review in early May, and today the company sent us a custom 10% discount coupon (GRAPHENE10) to share with our readers. You can find out more, and order the graphene jacket here.

The jacket uses graphene in two ways. Graphene is infused into the coat, with an aim to achieve thermo-regulation, and the jacket also includes graphene heating elements, in the pockets, and in the back. Read our full review here.

Read the full story Posted: Jun 04,2022

Graphene-enhanced wallpaper for heating homes is being trialed in Wales

A social housing development in Wales is reportedly being heated by graphene-enhanced wallpaper by NexGen Heating, as part of a trial exploring affordable alternatives to radiators and heat pumps to keep residents warm.

The graphene heating system, which aims to look and feel just like traditional wallpaper, can be plugged into a domestic socket, and is packaged with solar panels and a smart battery, meaning it cuts emissions while vastly lowering fuel costs.

Read the full story Posted: May 31,2022

Q36.5 launches graphene-enhanced cycling clothes

Q36.5, producer of advanced cycling clothing, has launched a line of bike shirts made of yarn that integrates graphene in the fabric (rather than using the material as a treatment).

Q36.5 launched graphene-enhanced yarn for bike shirts image

The "Clima Jersey" line is said to be made from a polyester fabric infused with graphene, and takes advantage of graphene’s conductive and heat dissipation properties to provide cutting edge thermoregulation, helping the wearer to stay cool and dry during hard efforts.

Read the full story Posted: May 12,2022

WearGraphene's graphene-enhanced jacket - a hands-on review

WearGraphene recently launched its Gamma graphene-enhanced winter jacket. I have spent a couple of months with this jacket, including two trips to Europe during the springtime, and here's my review.

First of all, the jacket looks very sleek (in my opinion, of course), the material feels of high quality. It is quite light, and packs very easily. There are many pockets, Velcro bands and drawstrings, which is really useful and helps you to customize this jacket so that it fits perfectly.

Read the full story Posted: May 01,2022

Honor Magic 4 series to adopt graphene cooling tech

The Honor Magic 4 Pro is about to be launched, and it is said to join a long list of mobile devices with graphene-based cooling technology.

The Honor Magic 4 series will reportedly adopt 'third-generation graphene technology superconducting hexagonal graphene' that improves the thermal conductivity by 50% compared with the first-generation graphene.

Read the full story Posted: Mar 03,2022

New industrial computer with graphene-based cooling technology

Interworld Electronics has released the BOXER-6641-PRO multi-core embedded controller from Aaeon, with a unique fan-less graphene heat sink chassis design that ensures an unprecedented operating temperature range of -40°C to 70°C.

Graphene-based cooling tech seems to be gaining popularity and is incorporated in various computer components (like MSI's RTX 3000 series GPUs), cellphones (like realme's GT 2 series, ZTE's Axon 30, Xiaomi's Mi 10 Ultra, various Huawei phones), and more.

Read the full story Posted: Mar 01,2022

Redmi K50 e-sports version sports an advanced graphene-based cooling system

Graphene-based cooling systems are becoming quite popular in today's cellphones, with many companies using it in their models. A few examples are: realme's GT 2 series, ZTE's Axon 30, Xiaomi's Mi 10 Ultra, various Huawei phones and more.

REDMI K50 E-SPORTS uses graphene cooling systems image

Now, it seems that Redmi's K50 e-sports has joined this team, with a recent disassembly test that found that its heat dissipation system makes use of graphene films. The test also reported 3D high-power graphite, large-area double VC, and heat dissipation copper sheet + boron nitride.

Read the full story Posted: Feb 22,2022