spin – Page 2 – Shamskm: A site to exchange knowledge and solutions

MSU Chemists Become The First To Support an 84-Year-Old Theory

EAST LANSING, Mich. — The same principle that causes figure skaters to spin faster as they draw their arms into their bodies has now been used by Michigan State University researchers to understand how molecules move energy around following the absorption of light.

Conservation of angular momentum is a fundamental property of nature, one that astronomers use to detect the presence of satellites circling distant planets. In 1927, it was proposed that this principle should apply to chemical reactions, but a clear demonstration has never been achieved. (more…)

Nanocrystals Go Bare: Berkeley Lab Researchers Strip Material’s Tiny Tethers

By Guest PostDecember 12, 2011Scienceanna llordes, april sawvel, berkeley lab, brett helms, carbon hydrogen bonds, chemical solution, delia milliron, devices, diodes, electronic conductivity, energy storage, environments, evelyn rosen, hydrocarbon, ink jet printer, lawrence berkeley national laboratory, ligand free nanocrystal, ligands, meerwein salt, metal oxides, metallic, molecular foundry, molecular vibrations, naked nanocrystals, nano ir, nanocrystal, nanoscale infrared spectroscopy, orders of magnitude, organic compound, organic ligands, organometallic molecules, oxidizing agents, photovoltaics, raffaella buonsanti, selenide nanocrystal, semiconductors, smart windows, solar fuels, spin, spray coating, stripping nanocrystals, strong acids, supercapacitor materials, surface ligands, tether like molecules, triethyloxonium tetrafluoroborate, universal technique, unstripped nanocrystal films, variety of applications

Researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) have discovered a universal technique for stripping nanocrystals of tether-like molecules that until now have posed as obstacles for their integration into devices. These findings could provide scientists with a clean slate for developing new nanocrystal-based technologies for energy storage, photovoltaics, smart windows, solar fuels and light-emitting diodes.

Nanocrystals are typically prepared in a chemical solution using stringy molecules called ligands chemically tethered to their surface. These hydrocarbon-based or organometallic molecules help stabilize the nanocrystal, but also form an undesirable insulating shell around the structure. Efficient and clean removal of these surface ligands is challenging and has eluded researchers for decades. (more…)

Tag Archives: spin

MSU Chemists Become The First To Support an 84-Year-Old Theory

Nanocrystals Go Bare: Berkeley Lab Researchers Strip Material’s Tiny Tethers