Nanoscale engineering boosts performance of quantum dot light emitting diodes
In an article recently published in the journal Applied Physics Letters, Arizona State University researchers, in collaboration with a scientific team led by Professor Alan Doolittle at the Georgia Institute of Technology, have just revealed the fundamental aspect of a new approach to growing InGaN crystals for diodes, which promises to move photovoltaic solar cell technology toward record-breaking efficiencies.
With ecological viability threatened, world resources draining and population burgeoning, the end is nigh. Or not, says Lawrence M. Cathles, Cornell professor of earth and atmospheric sciences in his article, "Future Rx: Optimism, Preparation, Acceptance of Risk," in a special publication of The Journal of the Geological Society.
Solar cells that produce electricity 24/7. Cell phones with built-in power cells that recharge in seconds and work for weeks between charges: These are just two of the possibilities raised by a novel supercapacitor design invented by material scientists at Vanderbilt University.
Photovoltaic devices offer a green -- and potentially unlimited -- alternative to fossil fuel use. So why haven't solar technologies been more widely adopted? Quite simply, "they're too expensive," says Ji-Seon Kim, a scientist at Imperial College London, who, along with her colleagues, has come up with a technology that might help bring the prices down. They describe their new approach to making cheaper, more efficient solar panels in The Journal of Chemical Physics.
With the use of high voltage equipment, very small plasmas can be used to manipulate fluid flows. In recent years, the development of devices known as plasma actuators has advanced the promise of controlling flows in new ways that increase lift, reduce drag and improve aerodynamic efficiencies -- advances that may lead to safer, more efficient and more quiet land and air vehicles in the near future.
Scientists at the U.S. Department of Energy's Brookhaven National Laboratory have identified the key genes required for oil production and accumulation in plant leaves and other vegetative plant tissues. Enhancing expression of these genes resulted in vastly increased oil content in leaves, the most abundant sources of plant biomass-a finding that could have important implications for increasing the energy content of plant-based foods and renewable biofuel feedstocks.
A new study shows it takes less energy to print many household items at home than to manufacture them en masse.
A trio of researchers at North Dakota State University, Fargo and the University of South Dakota have turned to computer modeling to help decide which of two competing materials should get its day in the sun as the nanoscale energy-harvesting technology of future solar panels -- quantum dots or nanowires.
As recently reported in the Journal of Applied Physics, a team of researchers at MIT have developed an accurate 3-D model of streamer propagation that qualitatively and quantitatively describes the streamer development, an advance that may impact applications such as medical imaging, aerospace engineering, power transmission, atmospheric sensing, natural sciences, sensing technologies and large-scale industry.
Drexel University researchers are continuing to expand the capabilities and functionalities of a family of two-dimensional materials they discovered that are as thin as a single atom, but have the potential to store massive amounts of energy. Their latest achievement has pushed the materials storage capacities to new levels while also allowing for their use in flexible devices.
Researchers are offering advice for owners of urban delivery truck fleets who may be considering diesel versus electric vehicles.
There is a current superstar species of blue-green algae that, through its powers of photosynthesis and carbon dioxide fixation, or uptake, can produce ethanol, hydrogen, butanol, isobutanol and potentially biodiesel. Now that's some five-tool player.
The dream of igniting a self-sustained fusion reaction with high yields of energy, a feat likened to creating a miniature star on Earth, is getting closer to becoming reality, according the authors of a new review article in the journal Physics of Plasmas.
Policymakers need to rethink the idea of promoting biofuels to protect the climate because the methods used to justify such policies are inherently flawed, according to a University of Michigan energy researcher.
Brookhaven Lab scientists use simple, 'green' process to create novel core-shell catalyst that tolerates carbon monoxide in fuel cells and opens new, inexpensive pathways for zero-emission vehicles
In the long sprint to find new sources of clean, low-cost power, slow and steady might win the race -- the slow-moving water of currents and tides, that is. Just as wind turbines tap into the energy of flowing air to generate electricity, hydrokinetic devices produce power from moving masses of water.
Engineers at Sandia National Laboratories, along with partner institutions Georgia Tech, Bucknell University, King Saud University and the German Aerospace Center (DLR), are using a falling particle receiver to more efficiently convert the sun's energy to electricity in large-scale, concentrating solar power plants.
Fracking for natural gas may negatively impact the value of homes near the drill site, according to a survey to be reported in a forthcoming issue of The Journal of Real Estate Literature.
University of Michigan researchers today released seven technical reports that together form the most comprehensive Michigan-focused resource on hydraulic fracturing, the controversial natural gas and oil extraction process commonly known as fracking.
Mention cars that get barely 3 miles to a gallon and are built for speed rather than cleanliness, and images of gas-guzzling, pollution-belching menaces burning leaded gasoline or nitro may spring to mind. But experts today described how ethanol blends used as fuel in the race cars of the Indianapolis 500 actually make those emissions cleaner than cars on the street. They spoke at the 246th National Meeting & Exposition of the American Chemical Society.
One of the first analyses of laws banning disposal of electronic waste (e-waste) in landfills has found that state e-waste recycling bans have been mostly ineffective, although California's Cell Phone Recycling Act had a positive impact. However, e-waste recycling rates remain "dismally low," and many demographic groups remain unaware of their alternatives, according to the study, which was presented today at the 246th National Meeting & Exposition of the American Chemical Society.
High school and college students got a recruiting call today to join the Solar Army and help solve one of the 21st century's greatest scientific challenges: finding the dirt-cheap ingredients that would make sunlight a practical alternative to oil, coal and other traditional sources of energy. Harry B. Gray, Ph.D., described the army's mission during the "Kavli Foundation Innovations in Chemistry Lecture" at the 246th National Meeting & Exposition of the American Chemical Society.
With almost 40 billion tons of carbon dioxide (CO2) released each year from burning coal, gasoline, diesel and other fossil fuels in the United States alone, scientists are seeking ways to turn the tables on the No. 1 greenhouse gas and convert it back into fuel. Those efforts are the topic of a symposium in Indianapolis today at the 246th National Meeting & Exposition of the American Chemical Society, the world's largest scientific society.
"Biofuel" is a global buzzword, with cars and trucks powered by fuel made from corn, switchgrass and waste cooking oil, envisioned as a way to stretch out supplies of crude oil and cope with global warming. A symposium being held here today at the 246th National Meeting & Exposition of the American Chemical Society considers: What are the health and environmental effects of alternative fuels, and how do they compare with conventional fuels?