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[woodpeckers] 18/1/2019 13:57

Crumbs! Just read half of "The Graphene Revolution" whilst waiting for my son's car to be fixed and thought I'd come on here for a bit of light relief... my brain must be scrambled...

[ellissj] 18/1/2019 13:45

Indeed, just as the phoenix does from the ashes of our pain. Best ellis

[luckyorange] 18/1/2019 13:41

Alchemys fault !

Looks about to rise again!

[luckyorange] 18/1/2019 13:28

Like I said..... infinite and that ain't an original thought ;)

Another thought is that the 25k's are going somewhere... but where?

[ellissj] 18/1/2019 13:26

Article on graphene ink here. Tweeted by cambridge graphene, then retweeted by david kerr. Best ellis

'Multitasking graphene ink printed into tiny flexible supercapacitors'

BY ALEXANDER WHITESIDE17 JANUARY 2019

'Screen-printed devices show strength in numbers'

Researchers in China have developed an easy way to make complicated arrays of microsupercapacitors that involves screen-printing them out of graphene ink. The simplicity and freedom offered by the approach will aid the development of new approaches to electronics and flexible devices.

Although semiconductor components continue to shrink, not all of the parts of modern gadgets are as easy to miniaturise. Capacitors and batteries are particularly challenging given that they are complex and discrete bundles of different materials. Microsupercapacitors, a tiny relative of both of these components, can do similar jobs.

Now, scientists at the Chinese Academy of Sciences have come up with a screen-printing method using a multi-purpose graphene ink that quickly lays down multiple microsupercapacitors in a variety of shapes and as complicated arrays. The ink combines graphene and carbon black, both of which are conductive, with a polymer binder in a solvent, although the simplicity of the mixture belies the difficulty in finding the right composition. ‘Preparing inks with suitable electrical, electrochemical and rheological properties was one of the biggest challenges for printable integrated microsupercapacitors,’ emphasises Zhong-Shuai Wu, one of the principal investigators on the project. Importantly, the ink shows shear-thinning behaviour, like ketchup: as it’s applied, the force causes it to lose its viscosity so it flows easily, but as soon as the force is removed, it thickens and keeps its shape.They applied the graphene ink to a substrate, such as glass or flexible PET plastic, using a patterned screen as a stencil. The resulting pattern includes all of the conductive parts of the device. ‘The graphene-based ink can act as the microelectrodes, metal-free current collectors and interconnects, simultaneously,’ Wu notes. The ink dries for 12 hours, and then an electrolyte gel is applied and allowed to solidify for a further 12 hours, at which point the device is ready to use.Because the entire structure of the device can be laid out in one step, very complicated designs can be made with ease. Although a single microsupercapacitor supplies less than one volt, the researchers were able to integrate 130 of them in series, giving an output of over 100 volts. ‘Micro-robots and soft actuators based on dielectric elastomer require hundreds and even thousands of volts,’ says Wu. ‘High voltage operation increases the scope and usefulness of microsupercapacitors,’ agrees Francesca Iacopi, head of the integrated nanosystems lab at the University of Technology Sydney in Australia.The devices are also flexible, if they’re printed on a flexible substrate, which should make them compatible with wearable electronics. ‘The versatility and low cost of this screen-print approach could be a plus in the wearable systems that are disposable, which is what most of the external health monitoring and other wearable systems are meant to be,’ says Iacopi. ‘I believe microsupercapacitors on flexible substrates like these would be particularly promising to support the area of wearable systems for health monitoring, for example sensors placed on skin and eyes.’

The investigators are keen use their method to make more complete devices, by including components that can harvest energy and store it in the microsupercapacitors, or put that stored energy to use. They also hope to use new electrolytes to increase the voltage each capacitor can provide, and improve the total energy a device can store.

References

This article is free to access until 28 February 2019

X Shi et al, Energy Environ. Sci., 2019, DOI: 10.1039/c8ee02924e"



Tweets:

[pshevlin] 18/1/2019 13:15

"it must have been said before he wrote it down" Not if it was an original thought at the time it was written down and if " no-one has an original thought" that implies that the "thoughts" were in existence prior to human existence. We can debate that forever and it depends on whether you are a Rationalist or an Empiricist.

[kemorkid] 18/1/2019 12:57

I can sell 50000 @122.26 but I won’t!!!
Through HL

[luckyorange] 18/1/2019 12:35

Cautiously optimistic

is the general market consensus.

[alchemy] 18/1/2019 12:32

Oh Pascal, triangles.

[luckyorange] 18/1/2019 12:08

Is it clarity? One thing that I didn't know (amongst the many) was he put this in writing...

"There is nothing so strange and so unbelievable that it has not been said by one philosopher or another."

However, it must have been said before he wrote it down! Modern brief interpretation is (for me) that no-one has an original thought (not my idea, someone else thought that first).

Like space..... infinite.

My brain hurts 😬

[ellissj] 18/1/2019 12:02

Click on this twitter link to see a 'before shot' of vrs lab at Geic. Plus all the equipment vrs has access too. 100 industrial partners per baker. Wonder how it will look at the ID ? Hopefully A beacon indeed ! Best ellis

Neill Ricketts @neillricketts

"Our lab taking shape @UoMGraphene #GEIC a beacon for 2d materials"

1:05 PM · Dec 17, 2018 ·

[cheek212] 18/1/2019 11:56

Your twisting my melons man!!

[alchemy] 18/1/2019 11:55

It's hinted in Hamlet that he should go to England because they are all mad there. News next week. There you are, Cartesian clarity.

[luckyorange] 18/1/2019 11:47

Well Alchemy , I was thinking something similar if I interpret your post correctly... I say similar because actually thinking the same as you therein lies madness for me 😉 😵

[scottishfield] 18/1/2019 11:28

Same here foolishben.

[foolishben] 18/1/2019 11:26

Agreed a-game, I also had a decent sized top up this morning. I am no technical analyst but the chart looks very healthy indeed and we pretty much all know that the news we require for a breakout is imminent. Short term traders aside, most of those who wished to sell are likely to have done so now and those that have bought will be seeking prices much higher than where we are currently at. Nothing is certain in life but regardless of being very overweight Versarien, I feel good and am sleeping well.

[alchemy] 18/1/2019 11:21

A truth universally , well parochially, overlooked? An investment day needs something to talk about. We have loads to be updated upon.An investment day benefits hugely from something new announced the Morning of The Event. That's been overlooked , well in terms of postings. The stars are lining up.The 2d equivalents of Andre Previn Glenda Jackson Shirley Bassey ...they'll all be there .Next Week?

[melf] 18/1/2019 11:10

It may not mean anything, but NR tweeted a link to a Happy Mondays song yesterday evening. We know in the past he's often thrown clues into the mix so I thought I'd mention it.

Not ramping.....just saying.

[festario] 18/1/2019 11:03

Blue finish without doubt today

[ellissj] 18/1/2019 10:57

Lol. Very good sands. Atb. Ellis

[sandbag] 18/1/2019 10:55

ellissj,

Oh no I didn't LOL! Dr Andrew Deakin was on the list but how on earth could I miss Professor Ferrari and others?
Versarien is starting to look like the Morecambe and Wise of the 2D world. All the top stars of the 2D world want to be here.

[ellissj] 18/1/2019 10:36

Indeed sands. And dr. Andrew (wussname !deakin ?) And cambridge graphene ltd staff.

People.

Team

Neill Ricketts
Chief Executive Officer

Stephen Hodge
Chief Technical Officer

Mark Shepherd
Consultant

Advisory Board:

Dr. Felice Torrisi
Technology Advisor

Professor Andrea Ferrari
Technology Advisor

Dr. Tawfique Hasan
Technology Advisor

[sandbag] 18/1/2019 10:09

shavian,

I also missed out Iain Gray, another important member of the team. Must try harder!

[ellissj] 18/1/2019 10:00

Indeed fuji, and with 3T capacity now in play, vrs has greater ways and means re those 'hard numbers.' Than ever before :) its careful craft and derisking that will help see vrs succeed and let's not forget in extraordinary times. As neill tweet re 'working with iso, nga, bsi etc etc.' Shows in spades, vrs are right at the heart of 2D materials commercialisation to my mind, the right standards, products and team/strategy going forward. As they say, 'you can't put the cart before the horse.' Timing is everything. Aimo. Dyor. Best ellis