homehome Home chatchat Notifications


Graphene: unlimited heat conductivity

It’s official – graphene is the wonder material of the millennium. A team of researchers at the Max Planck Institute for Polymer Research (MPI-P) in Mainz and the National Univ. of Singapore found that thermal conductivity of graphene diverges with the size of the samples. What’s the big deal? Well, the findings show that the thermal […]

Tibi Puiu
May 13, 2014 @ 1:05 pm

share Share

It’s official – graphene is the wonder material of the millennium. A team of researchers at the Max Planck Institute for Polymer Research (MPI-P) in Mainz and the National Univ. of Singapore found that thermal conductivity of graphene diverges with the size of the samples. What’s the big deal? Well, the findings show that the thermal conductivity of graphene is not a constant, as is the case for 99.99% of all other materials, but increases with the length of graphene. Scientists already knew graphene has excellent heat transfer capabilities, but few suspected this much. For the electronics industry, these findings might be a game changer.

Graphene heat conductivity NOT a constant

French physicist Joseph Fourier had postulated the laws of heat propagation in solids, according to whihc thermal conductivity is an intrinsic material property that is normally independent of size or shape – a constant. Yet, this is not the case for graphene, a two-dimensional layer of carbon atoms bound together in a hexagon shape.

Graphene

Photo: CNN

Davide Donadio, head of a Max Planck Research Group at the MPI-P, and colleagues performed extensive numerical simulations, whose results were backed by experiments, and found that the thermal conductivity logarithmically increases as a function of the size of the graphene samples. In other words, the longer the graphene layer, the more heat can be transferred through the batch of material. After analyzing the simulations, Davide Donadio found that this feature stems from the combination of reduced dimensionality and stiff chemical bonding, which make thermal vibration propagate with minimal dissipation at non-equilibrium conditions.

“We recognized mechanisms of heat transfer that actually contradict Fourier’s law in the micrometer scale. Now all the previous experimental measurements of the thermal conductivity of graphene need to be reinterpreted. The very concept of thermal conductivity as an intrinsic property does not hold for graphene, at least for patches as large as several micrometers”, says Davide Donadio.

It seems like every month, at least, there’s a new useful characteristic about surface that we come to learn. It is chemically very stable, flexible, a hundred times more tear-resistant than steel and at the same time very light. The fact that it has excellent electrical conductivity, however, coupled with this latest findings makes graphene a game changer for the electronics industry of the future. Now, the most important challenge researchers need to address is scaling manufacturing of graphene so that billions may practically experience what graphene can do, not just read about it and ponder about how marvelous technology, and human society consequently, can grow aided by this wonder material.

The findings appeared in the journal Nature.

share Share

If you use ChatGPT a lot, this study has some concerning findings for you

So, umm, AI is not your friend — literally.

Revenge of the Fish: A Bone Pierced Through Man’s Gut and Stabbed His Liver

A swallowed bone made its way from the gut to the liver, causing weeks of mystery pain

Miyazaki Hates Your Ghibli-fied Photos and They're Probably a Copyright Breach Too

“I strongly feel that this is an insult to life itself,” he said.

This Is Why Human Faces Look So Different From Neanderthals

Your face stops growing in a way that neanderthals' never did.

AI-Assisted Wearable Device 'Speaks' For People With Dysfunctional Vocal Cords

Speech-language pathology is an area of medical science based on the mechanics of voice production and the evaluation, treatment and prevention of communication. AI-assisted technology is now part of treatment options for conditions that affect speech, such as stuttering or the inability to control specific muscles after a stroke.  UCLA bioengineers have created a device […]

Scientists sawed a human brain into 703 cubes to map its energy system for the first time

Your brain burns 20 percent of your body’s energy and now we know exactly where it goes.

This Tiny Nuclear Battery Could Last for Thousands of Years Without Charging

The radiocarbon battery is supposed to be safe for everyday operations.

Bad microphone? The people on your call probably think less of you

As it turns out, a bad microphone may be standing between you and your next job.

New study shows why you should switch to filtered coffee

It doesn't matter what type of coffee or filter. Just filter your coffee.

Sharks Aren’t Silent After All. This One Clicks Like a Castanet

This is the first evidence of sound production in a shark.