Graphene thermal conductivity

Graphene-enhanced firefighting gear can reduce firefighters' rate of injury and mortality

Researchers from China's Xi’an Polytechnic University, Tsinghua University, Chinese Academy of Sciences CAS) and Shaanxi Textile Research Institute have found that breathable electrodes woven into fabric used in fire suits have proven to be stable at temperatures over 520ºC. At these temperatures, the fabric is found to be essentially non-combustible with high rates of thermal protection time at the maximum values recorded so far for such technology at 18.91 seconds.

The results show the efficacy and practicality of Janus graphene/poly(p-phenylene benzobisoxazole), or PBO, woven fabric in making firefighting “smarter”, with aims to manufacture products on an industrial scale that are flame-retardant but also intelligent enough to warn the firefighter of increased risks while facing flames.

Read the full story Posted: Jan 18,2023

Xiaomi launches a new graphene baseboard heater

Xiaomi announced a new product, the Mijia Graphene Baseboard Heater (Fire Edition). The device uses two graphene-based heating elements, and has a simulated flame function that uses an integrated humidifier and LEDs to generate the flame appearance.

The Mijia Graphene Baseboard Heater is available now in China for pre-order for 1,299 yuan (around $180), and its retail price is expected to be 1,599 yuan (around $220).

Read the full story Posted: Nov 06,2022

Graphene-enhanced composites and adhesives tested for use in satellites

An ESA project with Adamant Composites in Greece tested how the addition of graphene (and other nano-sized materials) can optimize a satellite’s thermal and electrical properties.

The airless vacuum of space is a place where a satellite can be hot and cold at the same time, with part of it in sunlight and the rest in the shade. Scientists work to minimize temperature extremes within a satellite’s body, because heat buildups might lead to parts going out of alignment or even buckling. Another undesirable outcome in highly-insulating vacuum conditions is for satellite surfaces to build up electrical charge, which may eventually result in disruptive or damaging discharge events. Composite materials are increasingly supplanting traditional metal parts aboard satellites, but these polymer-based materials possess lower thermal and electrical conductivity, compounding such problems.

Read the full story Posted: Oct 16,2022

First Graphene and ZEBCO to develop graphene-enhanced heating device

First Graphene will be developing and marketing a unique heating device using its PureGRAPH graphene, along with UK-based ZEBCO Heating. The parties have signed a joint development agreement (JDA) to develop the device, which is suitable for new installations or retrofitted into existing domestic and commercial heater systems.

ZEBCO has secured an initial $87,000 grant from Innovate UK’s Fast Start Innovation Fund to fund feasibility studies and develop a proof-of-concept unit within the next six months. The device is expected to deliver energy efficiency savings, reduce greenhouse gas emissions, and be an enabler to more resilient and secure domestic heating supply.

Read the full story Posted: Oct 14,2022

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