Carbon nanotubes

Post Reply
User avatar
wjfox
Site Admin
Posts: 1904
Joined: Sat May 15, 2021 6:09 pm
Location: Plague Island
Contact:

Carbon nanotubes

Post by wjfox »

Nanotubes aligned in pristine condition

26th May 2021

Scientists in Japan have developed a new "dry transfer technique" for the precise positioning of carbon nanotubes.

Read more: https://www.futuretimeline.net/blog/202 ... nology.htm


Image
"Take it easy, nothing matters in the end."
– William Shatner
User avatar
Time_Traveller
Posts: 550
Joined: Sun May 16, 2021 4:49 pm
Location: Glasgow, The Republic of Scotland October 17th 2505 C.E.

Re: Carbon nanotubes

Post by Time_Traveller »

A new material made from carbon nanotubes can generate electricity by scavenging energy from its environment
June 7, 2021

Image

MIT engineers have discovered a new way of generating electricity using tiny carbon particles that can create a current simply by interacting with liquid surrounding them.

The liquid, an organic solvent, draws electrons out of the particles, generating a current that could be used to drive chemical reactions or to power micro- or nanoscale robots, the researchers say.

"This mechanism is new, and this way of generating energy is completely new," says Michael Strano, the Carbon P. Dubbs Professor of Chemical Engineering at MIT. "This technology is intriguing because all you have to do is flow a solvent through a bed of these particles. This allows you to do electrochemistry, but with no wires."

In a new study describing this phenomenon, the researchers showed that they could use this electric current to drive a reaction known as alcohol oxidation—an organic chemical reaction that is important in the chemical industry.
https://phys.org/news/2021-06-material- ... nging.html
“People assume that time is a strict progression of cause to effect, but *actually* from a non-linear, non-subjective viewpoint - it's more like a big ball of wibbly wobbly... time-y wimey... stuff.” - Steven Moffat
weatheriscool
Posts: 1761
Joined: Sun May 16, 2021 6:16 pm

Re: Carbon nanotubes

Post by weatheriscool »

4 Inch Wafer of Trillions of Aligned Carbon Nanotubes
September 18, 2021 by Brian Wang
https://www.nextbigfuture.com/2021/09/4 ... tubes.html
Carbon nanotubes can be five times as energy efficient and five times faster than silicon. engineers at the University of Wisconsin–Madison can align the nanotubes for computer chips by turning them into 2D liquid crystals. They can coat an entire 4-inch wafer with a uniform array of highly aligned carbon nanotubes in 40 seconds.

A purification process produces nanotubes in solvents, or nanotube inks, which they then flow at a constant velocity and thickness over a layer of water. At the interface between the ink and water, the nanotubes begin to concentrate and self-organize, forming a liquid crystal. That liquid crystal is then transferred on a substrate moved through the ink and water interface. The result is a wafer covered in trillions of highly aligned carbon nanotubes.

The nanotube density is near that needed for electronics. They determined the alignment of the tubes to be within 6° locally. This almost ideal nanotube ordering led to excellent electrical properties that were confirmed consistent across the entire wafer.

The process is a big advance for carbon nanotube research. However, it does need some tweaks before nanotube computer processors end up in smartphones and laptops. The industry standard is 12-inch wafers, so the process, patented through the Wisconsin Alumni Research Foundation, needs to be scaled up while maintaining the uniformity of the nanotube alignment.

They can also be deposited in multiple layers, like 3D integrated circuits. That would allow us to increase the number of transistors significantly.
User avatar
andmar74
Posts: 112
Joined: Mon May 24, 2021 9:10 am

Re: Carbon nanotubes

Post by andmar74 »

Carbon nanotubes? Well..

Here's a news item from a KurzweilAI daily newsletter, august 2005:

"Large, transparent sheets of carbon
nanotubes can now be produced at
lightning speed. The new technique
should allow the nanotubes to be
used in commercial devices from
heated car windows to flexible
television screens. At team led by
Ray Baughman, a chemist from the
University of Texas at Dallas, can
churn out up to ten meters of
nanoribbon..."
User avatar
wjfox
Site Admin
Posts: 1904
Joined: Sat May 15, 2021 6:09 pm
Location: Plague Island
Contact:

Re: Carbon nanotubes

Post by wjfox »

andmar74 wrote: Mon Sep 20, 2021 8:29 am Carbon nanotubes? Well..

Here's a news item from a KurzweilAI daily newsletter, august 2005:

"Large, transparent sheets of carbon
nanotubes can now be produced at
lightning speed. The new technique
should allow the nanotubes to be
used in commercial devices from
heated car windows to flexible
television screens. At team led by
Ray Baughman, a chemist from the
University of Texas at Dallas, can
churn out up to ten meters of
nanoribbon..."

There's a big difference between lab work and mass commercialisation.

A lot of progress has occurred since then, however:

https://en.wikipedia.org/wiki/Carbon_na ... plications

"A primary obstacle for applications of carbon nanotubes has been their cost. Prices for single-walled nanotubes declined from around $1500 per gram as of 2000 to retail prices of around $50 per gram of as-produced 40–60% by weight SWNTs as of March 2010. As of 2016, the retail price of as-produced 75% by weight SWNTs was $2 per gram."
"Take it easy, nothing matters in the end."
– William Shatner
Post Reply