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Graphene

Graphene
High-quality graphene is strong, light, nearly transparent and an excellent conductor of heat and electricity. Its interactions with other materials and with light and its inherently two-dimensional nature produce unique properties, such as the bipolar transistor effect, ballistic transport of charges and large quantum oscillations. At the time of its isolation in 2004,[1] researchers studying carbon nanotubes were already familiar with graphene's composition, structure and properties, which had been calculated decades earlier. Definition[edit] "Graphene" is a combination of graphite and the suffix -ene, named by Hanns-Peter Boehm,[3] who described single-layer carbon foils in 1962.[4] The term graphene first appeared in 1987[5] to describe single sheets of graphite as a constituent of graphite intercalation compounds (GICs); conceptually a GIC is a crystalline salt of the intercalant and graphene. History[edit] The theory of graphene was first explored by P. Properties[edit] Chemical[edit]

Tesla's Big Mistake? While experimenting with a long, thin 'secondary' coil from a Tesla Coil, I suddenly connected up several things in my mind which had been separate up to that moment. After years of messing with Tesla Coils, I finally see what Tesla was up to with single wire transmission, with resonant coils, and with longitudinal waves. See if the following doesn't make sense. If we wrap a single-layer coil of wire upon a very long plastic tube, we have a Tesla resonator as in Fig 1 above. Now we put a metal sphere on either end to prevent corona from spewing out of the dangling wire tips, and we've built a simple electrical power system. This is the infamous single wire transmission line. In conventional cables there are two conductors, and the voltage between them forms the "E" part of the EM wave. Interesting? HOWEVER, this is not unique. It turns out that you can send microwave or UHF signals along a *single* wire as long as that wire is coated with a dielectric. How does this relate to Tesla?

Graphene News Nov. 13, 2015 — Graphene is the first truly two-dimensional crystal, which was obtained experimentally and investigated regarding its unique chemical and physical properties. In 2010, two researchers were awarded ... read more Nov. 4, 2015 — By 'crumpling' to increase the surface area of graphene-gold nanostructures, researchers have improved the sensitivity of these materials, opening the door to novel opportunities in ... read more Nov. 2, 2015 — Scientists have developed ultrasensitive gas sensors based on the infusion of boron atoms into the tightly bound matrix of carbon atoms known as ... read more Researcher Develops Material to Create Sustainable Energy Source Nov. 2, 2015 — A new article details how this new material efficiently captures sunlight and then, how the energy can be used to break down water into oxygen and hydrogen. Semitransparent Perovskite Solar Cells With Graphene Electrodes Super Sensitive Magnetic Sensor Created Scientists Synthesize Hexagonal Boron Nitride

Graphene Will Change The Way We Live | Dr. Kaku's Universe The theory behind the substance graphene was first explored by theoretical physicist Philip Wallace in 1947 as kind of a starting point when he was doing research trying to understand the electronic properties of more complex, 3D graphite. although the name graphene wasn't actually coined until 40 years later, where it was used to describe single sheets of graphite. In other words, it's the name given to a flat monolayer of carbon atoms that are tightly packed into a 2D honeycomb lattice; like a molecular chicken-wire that is one atom thick. It's essentially the basic building block for graphitic materials of all other dimensionalities; it's a stepping stone to building bigger things. Graphene in itself however wasn't discovered until 2004 in its full observable and testable form. Since then, in the past 6 years, scientists have discovered that the substance retains some amazing properties.

Unzipping Carbon Nanotubes Can Make Graphene Ribbons (PhysOrg.com) -- By "unzipping" carbon nanotubes, researchers have shown how to make flat graphene ribbons. Graphene, which is a one-atom-thick sheet of carbon that looks like chicken wire, has unique electrical properties that could have many future electronics applications. However, one of the biggest challenges researchers currently face is producing graphene in large quantities. Recently, two research groups have demonstrated that unzipping carbon nanotubes can produce graphene ribbons in a variety of widths. In the first group, scientists at Rice University in Houston led by James Tour used sulphuric acid and an oxidizing agent to chemically create a hole in the carbon nanotubes. The researchers suggest that this type of graphene ribbon could be used for conductive or semiconducting thin films, and possibly as an inexpensive substitute for monocrystalline silicon in photovoltaics. © 2009 PhysOrg.com Explore further: Polymer microparticles could help verify goods

How to Make Graphene Graphene–a flat single layer of carbon atoms–can transport electrons at remarkable speeds, making it a promising material for electronic devices. Until recently, researchers had been able to make only small flakes of the material, and only in small quantities. However, Rutgers University researchers have developed an easy way to make transparent graphene films that are a few centimeters wide and one to five nanometers thick. Thin films of graphene could provide a cheap replacement for the transparent, conductive indium tin oxide electrodes used in organic solar cells. In fact, Rutgers materials science and engineering professor Manish Chhowalla and his colleagues used their graphene films to make prototype transistors and organic solar calls. By contrast, current techniques for making graphene yield small quantities of the material, fit only for experimental use. The researchers start by making a suspension of graphene oxide flakes.

PhysTopics -- Physics Institutions and Journals by their Subject of Research Topics provides an overview of Institutions, Groups, Researchers working on a specific topic in Physics (using the classification schema of PACS2003 . Physics Departments and Journals classified according to PACS 2003 Critical Thinking Every moment of every day, we are bombarded by information. For animals and prehistoric man, this information was always firsthand: the things one sees, hears, touches, tastes, and smells. With the advent of language, we gained access to another kind of information: secondhand. Think about all the information that is in your head. Chances are, most of it was secondhand. In today's world, the bombardment of information dwarfs that of our prehistoric and even historic ancestors. 24 hours a day, the power of mass media can become a virtual cacophony. On consideration, this piecemeal and undisciplined process by which most people collage together their worldview seems a poor approach. There is a better way.

Sci-Tech : Graphene: a novel material with myriad uses After the discovery of one form of carbon — fullerenes — was awarded the Nobel Prize in Chemistry in 1996, this year's Nobel Prize for Physics was awarded to Andre K. Geim and Konstantin S. Novoselov, both at the University of Manchester, U.K., for succeeding in producing, isolating, identifying and characterizing another form of carbon — graphene. Anyone who has used an ordinary pencil has probably produced graphene-like structures, but without knowing it. Graphene, a single atomic layer of carbon, is the first two-dimensional (2D) crystalline material that has been identified and analyzed. It is a transparent conductor which is one atom thin. The thermal and electrical conductivity is very high and it can be used as a flexible conductor. Different forms Carbon can exist in several different forms. A new form of molecular carbon is the so called fullerenes. Though the existence of grapheme-like structures was already known in the 1960s, isolating single layers proved difficult.

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