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A Direct Look at Graphene

By Guest PostAugust 5, 2012Scienceandrey shytov, atom, berkeley lab, carbon atom, coulomb potential, dirac quasiparticles, electrical conductor, electron, factor, graphene, graphene device, graphene properties, hexagonally patterned, honeycomb, lattice, michael crommie, paul dirac, speed of light, stm, victor brar, yang wang

Direct Imaging by Berkeley Lab Researchers Confirms the Importance of Electron-Electron Interactions in Graphene

Perhaps no other material is generating as much excitement in the electronics world as graphene, sheets of pure carbon just one atom thick through which electrons can race at nearly the speed of light – 100 times faster than they move through silicon. Superthin, superstrong, superflexible and superfast as an electrical conductor, graphene has been touted as a potential wonder material for a host of electronic applications, starting with ultrafast transistors. For the vast potential of graphene to be fully realized, however, scientists must first learn more about what makes graphene so super. The latest step in this direction has been taken by researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California (UC) Berkeley.

Michael Crommie, a physicist who holds joint appointments with Berkeley Lab’s Materials Sciences Division and UC Berkeley’s Physics Department, led a study in which the first direct observations at microscopic lengths were recorded of how electrons and holes respond to a charged impurity – a single Coulomb potential – placed on a gated graphene device. The results provide experimental support to the theory that interactions between electrons are critical to graphene’s extraordinary properties. (more…)

Engineered Microvessels Provide a 3-D Test Bed for Human Diseases

By Guest PostMay 31, 2012Science3 d test bed, abraham stroock, abundant protein, bioengineering, blood clots, bloodstream, cancer, chemical factor, collagen, cornell university, disease, endothelial cells, honeycomb, human, human blood vessels, human cancer, human cell, jose lopez, mechanical, mice and monkeys, michael craven, model, petri dish, samuel totorica, shear stress, tumor progression, university of washington, ying zheng

Mice and monkeys don’t develop diseases in the same way that humans do. Nevertheless, after medical researchers have studied human cells in a Petri dish, they have little choice but to move on to study mice and primates.

University of Washington bioengineers have developed the first structure to grow small human blood vessels, creating a 3-D test bed that offers a better way to study disease, test drugs and perhaps someday grow human tissues for transplant.

The findings are published online this week in the Proceedings of the National Academy of Sciences. (more…)

New Technique Lets Scientists Peer Within Nanoparticles, See Atomic Structure in 3-D

By Guest PostMarch 23, 2012Science3 d, atom, atomic scale resolution, atomic structure, chien chun chen, chris regan, chun zhu, conundrum, electronic property, gold atom, gold nanoparticle, gold particle, high energy electron, honeycomb, image, jianwei john miao, mary scott, material, matthew mecklenburg, microscope, nanomaterial, nanometer, nanostructure, peter ercius, radiation, rui xu, three dimensions, ucla, ulrich dahmen, x ray crystallography

UCLA researchers are now able to peer deep within the world’s tiniest structures to create three-dimensional images of individual atoms and their positions. Their research, published March 22 in the journal Nature, presents a new method for directly measuring the atomic structure of nanomaterials.

“This is the first experiment where we can directly see local structures in three dimensions at atomic-scale resolution — that’s never been done before,” said Jianwei (John) Miao, a professor of physics and astronomy and a researcher with the California NanoSystems Institute (CNSI) at UCLA. (more…)

Tag Archives: honeycomb

A Direct Look at Graphene

Engineered Microvessels Provide a 3-D Test Bed for Human Diseases

New Technique Lets Scientists Peer Within Nanoparticles, See Atomic Structure in 3-D