What is a foam?
A foam is a substance in which gas is trapped in a liquid or a solid in pockets. There are many types of foams - for example, those used by firefighters (mostly to combat burning oils). A bread is also, at least formally, a type of foam.
Graphene foams are usually made by growing graphene using a CVD process on a 3D metal foam (structure). The metal is then removed which leaves the graphene 3D foam.
Graphene foams are somewhat similar to graphene aerogels, in which the liquid part of the gel is replaced by a gas (usually air).
Graphene foams are now available commercially, contact us for details.
The latest graphene foam news:
In May 2017 we reported on a new project at the Institute of Low Temperature and Structure Research (Wroclaw, Poland) that developed a new efficient white light source that uses graphene foam excitated by a continuous-wave laser.
The project is still in progress, and the researchers demonstrated the technology at IDTechEx Graphene & 2D Materials Europe 2019 earlier this month, as can be seen in our video above.
Researchers from Nankai University in China and Rice University in the U.S. have developed a type of graphene-based foam that retains its texture when exposed to extremely cold temperatures.
The researchers note that almost all materials become more brittle and stiffer when exposed to very cold temperatures, often leading to loss of strength. In this new work, the researchers sought to find a material that would spring back after being crushed while exposed to extreme temperatures. To that end, they turned to graphene as a possible solution.
Graphene foam to potentially offer better treatment for joint diseases and eliminate the need for joint replacement
A new study out of Boise State University in the U.S may one day lead to new graphene-based treatments for osteoarthritis, potentially preventing the need for joint replacement.
The study investigates the compressive mechanical properties of graphene foam – soft tissue composites. Previous studies have shown graphene foam’s compatibility with chondrogenic cell lines for cartilage tissue engineering. This is reportedly the first study to focus on the viscoelastic behavior of the engineered tissue to test the functionality of the grown cartilage.
Rice University scientists have developed a simple way to create conductive, 3D objects made of graphene foam. The resulting objects may offer new possibilities for energy storage and flexible electronic sensor applications, according to Rice chemist Prof. James Tour.
The technique is an extension of groundbreaking work by the Tour lab that produced the first laser-induced graphene (LIG) in 2014 by heating inexpensive polyimide plastic sheets with a laser. The laser burns halfway through the plastic and turns the top into graphene that remains attached to the bottom half. LIG can be made in macroscale patterns at room temperature.
A research team from the Paul Scherrer Institute in Switzerland and Sapienza University in Rome developed a new loud speaker that is driven by a light signal - and without electricity. The idea is to use modulated light that shines on a 3D graphene sponge. The audio is achieved via a highly-efficient photo-mechanism.
The researchers say that unlike conventional loudspeakers, this high-fidelity photo-speaker does not rely on vibrations to produce the sound - and it does not need any type of electrical connection or complicated system for sound generation. Using an optical pulse train, this loudspeaker allows a completely digital operation for frequencies from acoustic to ultrasound.