Excellent Interviews and Videos on Graphene

Graphene is being applied by ultrasonic spray technology for a variety of applications, mainly as an additive in thin film coatings, such as transparent conductive films, Battery technology, Solar Cells, Sensors, Flexible Electronics, Transparent Electrodes, Superhydrophobic Surfaces and Protective Coatings.

Here is a collection of excellent stories, interviews and videos discussing many of the amazing applications for graphene.

Podcasts

Is Graphene the New ‘Wonder’ Material?  –  Science Friday, May 16, 2014:

GUESTS

Jonathan Coleman, Professor, Chemical Physics, Trinity College Dublin, Dublin, Ireland
A.T. Charlie Johnson, Professor, Physics and Astronomy, Director, Nano/Bio Interface Center, University of Pennsylvania, Philadelphia, Pennsylvania
James Hone , Professor, Mechanical Engineering, Columbia University, New York, New York

 A small UK company with big graphene dreams  –  Marketplace, July 28, 2014

Videos

//www.youtube.com/watch?v=Mcg9_ML2mXY

//www.youtube.com/watch?v=dTSnnlITsVg

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Quantum Dots market will reach $5 Billion by  2020.   Cost of manufacturing and rate of adoption are some of the main challenges still facing the industry.  Ultrasonic Spray of Quantum Dots has successfully been used to spray a variety of Quantum Dots.  Both ZnO films and CdS Quantum Dots have been prepared using ultrasonic spray pyrolysis deposition techniques.

As a widely used, inexpensive, versatile, large-scale production technique, spray pyrolysis method has been used successfully to fabricate nano-structured CdS/CdSe thin films or TiOx/ZnO films….using ultrasonic spray pyrolysis deposition.

When compared to chemical vapor deposition and sputtering, ultrasonic spray technology is a lower cost alternative and potentially scalable for industrialization.

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Graphene formed by de Laval Nozzle:

Researchers at the Department of Mechanical and Industrial Engineering, University of Illinois at Chicago and the Department of Mechanical Engineering, Korea University have formed high quality graphene substrates by spray using a de Laval nozzle, commonly used in jet engines.  A solution containing graphene flakes when blasted through a de Laval nozzle, a film of graphene forms of relative high quality.  Researches are not certain why this happens, but the theory according to Alexander Yarin, co-leader of the research,  the solution …” hits with enormous kinetic energy, and stretch in all directions. We’re tapping into graphene’s plasticity — it’s actually restructuring.”

Diagram of a de Laval nozzle, showing approximate flow velocity (v), together with the effect on temperature (T) and pressure (p) – Wikipedia

Other Methods of Graphene Formation:

Graphene is commonly made using CVD, drawback of CVD of course is it is restricted to a batch method and the sheets of graphene are limited to the size of the chamber.  Also ultrasonic spray nozzles are also be used in a variety of applications both large and small substrates.  Ultrasonic Spray Nozzles are non-clogging with very little to no overspray.  They are also capable of spraying a very thin nanolayer of material with high uniformity.

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Droplets bounce on impact with Graphene coated surface

Graphene as single atom layered super material has limitless potential.  When combined with Teflon as a Teflon coated graphene foam it becomes superhydrophobic.   Amazing image shows droplets making impact with this coated surface and bouncing off intact.  Graphene as a single layer onto glass or plastic adds a noticeable but subtle hue of grey shading, but nonetheless acceptable as an overlay.  This new type of superhydrophobic coating is promising for self-cleaning and anti-fouling surfaces.  Of course graphene’s other properties such as strength also come into play.

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