قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Laser-induced graphene becomes heavy, helping

Laser-induced graphene becomes heavy, helping



Rice University scientists have combined laser-induced graphene with various materials to use solid composites for various purposes. Credit: Tour Group / Rice University

Laser-induced graphene (LIG), a thin foam with atoms thick carbon, has many interesting properties but acquires new powers as part of a composite component.


James Tour Laboratories at Rice University and Christopher Arnusch, Professor at Ben-Gurion University, University of Negev, presented the LIG Composite Party in the Journal of the American Chemical Society ACS Nano .

When infusing the LIG with plastic, rubber, cement, wax or other materials, the laboratories formed composites with various possible applications. These new composites can be used in portable electronics, thermal therapy, water purification, icing and chilling, antimicrobial surfaces, and even in random access memory devices

in 201

4 when it used a commercial laser to burn thin plain plastic, polyimide. Laser heat turned the material gap into interrelated graphene flakes. The one-step process has made much more material and much less cost than conventional chemical vapor deposition

Since then, the Rice Laboratory and others have expanded the LIG test, even by lowering plastics to make wood and food. Last year Rice researchers created graphene foam for sculpture of 3-D objects

Laser-induced graphene produced by a method developed at Rice University can be combined with other composite materials. The materials are promised to use electronic, icing and heating systems. Credit: Tour Group / Rice University

"LIG is a great material, but it is not mechanically reliable," said Tour, who in his magazine last year presented general information on laser-generated graphene development in the magazine . “You can bend it and bend it, but you can't rub your hand. He crashes. If you do so with the so-called Scotch tape test, many will be removed. structure, it really hardens.

To make the composites, scientists have poured or hot pressed on a thin layer of another material attached to the polyimide. When the liquid solidifies, they have removed the polyimide for reuse, leaving the embedded graphene flake attached.

Soft composites can be used for active electronics in flexible garments, Tour said, while harder composites are super-hydrophobic (water-avoiding agents. When energized, a 20 micron thick LIG layer kills bacteria on the surface, so hardened materials suitable for antibacterial purposes [19659013] Laser-induced graphene becomes complicated with aid “/>

Scanning electron microscope image showing laser-induced graphene and polystyrene composite Credit: Tour Group / Rice University

Composites made from liquid additives are best suited for preserving the adhesion of LIG flakes. In the laboratory they are heated quickly and reliably when voltage is applied. This should provide the material with the potential to be used as a de-icing or de-icing layer as a flexible heating pad for injuries or clothing that rises as needed.

"You just pour it and now you move all the beautiful aspects of LIG into a material that is very reliable," said Tour.


Learn More:
Gases give laser-induced super properties of graphene

More information:
Duy Xuan Luong et al., Laser Induced Graphene Composites, as multifunctional surfaces, ACS Nano (2019). DOI: 10.1021 / acsnano.8b09626

Ruquan Ye et al. Laser-induced graphene, Chemical Research Accounts (2018). DOI: 10.1021 / acs.accounts.8b00084


Source link