Silicon-based electronics have physical limits that slow and may eventually halt the miniaturization of electronic devices. One of the possible solutions is to use molecules as circuits, but their poor conduction capabilities make them unlikely candidates. Researchers in Italy says, however, that the Kondo effect, in which molecules behave like magnetic impurities, could offer a solution.
Rice Univ. scientists have created a way to fine tune a process critical to the pharmaceutical industry that could save a lot of time and money. A combination of the Rice technique that provides pinpoint locations for single proteins and a theory that describes those proteins’ interactions with other molecules could widen a bottleneck in the manufacture of drugs by making the process of isolating proteins five times more efficient.
In only a few years, the efficiency of perovskite-based solar cells has increased from 3% to more than 16%. However, a detailed explanation of the mechanisms of operation within this photovoltaic system is still lacking. in recent work, scientists have now uncovered the mechanism by which these novel light-absorbing semiconductors transfer electrons along their surface.
Researchers at The Univ. of Texas at Austin’s Cockrell School of Engineering have developed a new source of renewable energy, a biofuel, from genetically engineered yeast cells and ordinary table sugar. This yeast produces oils and fats, known as lipids, that can be used in place of petroleum-derived products.
Recreating the story of humanity’s past by studying ancient bones can hit a snag when they deteriorate, but scientists are now reporting an advance inspired by seashells that can better preserve valuable remains. Their findings, which appear in Langmuir, could have wide-ranging implications for both archeology and paleontology.
An array of tiny diving boards can perform the Olympian feat of identifying many strains of salmonella at once. The novel biosensor developed by scientists at Rice Univ. in collaboration with colleagues in Thailand and Ireland may make the detection of pathogens much faster and easier for food-manufacturing plants.
Some may think of turkeys as good for just lunch meat and holiday meals, but bioengineers at the Univ. of California (UC), Berkeley saw inspiration in the big birds for a new type of biosensor that changes color when exposed to chemical vapors. This feature makes the sensors valuable detectors of toxins or airborne pathogens.
A Virginia Tech research team has developed a battery that runs on sugar, using a non-natural synthetic enzymatic pathway that strip all charge potentials from the sugar. While other sugar batteries have been developed, this one has an energy density an order of magnitude higher than others, allowing it to run longer before needing to be refueled.
As concerns about bacterial resistance to antibiotics grow, researchers are racing to find new kinds of drugs to replace ones that are no longer effective. One promising new class of molecules called acyldepsipeptides, ADEPs, kills bacteria in a way that no marketed antibacterial drug does. Now, researchers have shown that giving the ADEPs more backbone can dramatically increase their biological potency.
After a 10-year journey and a long, deep sleep the Rosetta space probe will be awoken on Jan. 20, 2014. The vehicle then starts the last leg of its journey which will lead it to the 67P/Churyumov-Gerasimenko comet. Then, mission leaders will attempt a space exploration first: setting the Philae lander down on the comet’s surface in November.
Solid catalysts based on precious metals, such as palladium, are widely used in industry to promote a range of chemical reactions. Finding ways to minimize the consumption of expensive catalytic materials, however, remains a critical challenge. Researchers in Japan have now developed a nanostructured catalyst that makes extremely efficient use of trace amounts of catalytic palladium.
Using a plant-derived chemical, Univ. of Wisconsin-Madison researchers have developed a process for creating a concentrated stream of sugars that’s ripe with possibility for biofuels. The research team has published its findings in Science, explaining how they use gamma valerolactone, or GVL, to deconstruct plants and produce sugars that can be chemically or biologically upgraded into biofuels.
How’s this for innovative: A Lawrence Berkeley National Laboratory-led team hopes to engineer a new enzyme that efficiently converts methane to liquid transportation fuel. Methane is the main component of natural gas and biogas from wastewater treatments and landfills. Another source is stranded natural gas, which is currently flared or vented at remote oil fields, and which represents an enormous unused energy resource.
Researchers simulating how certain bacteria run electrical current through tiny molecular wires have discovered a secret nature uses for electron travel. The results are key to understanding how the bacteria do chemistry in the ground, and will help researchers use them in microbial fuel cells, batteries or for turning waste into electricity.
The atomic force microscope (AFM) uses a fine-tipped probe to scan surfaces at the atomic scale. But soon, thanks to efforts by scientists in The Netherlands, the AFM will soon be augmented with a new type chemical sensor, one that resembles a microscopic fountain pen. A hollow AFM cantilever acts as the pen, delivering droplets of mercury at the tip, which acts as a chemical sensor.
Cartilage is notoriously difficult to repair or grow, but researchers at Duke Medicine have taken a step toward understanding how to regenerate the connective tissue. By adding a chemical to cartilage cells, the chemical signals spurred new cartilage growth, mimicking the effects of physical activity. The findings point to an ion channel called TRPV4 as a potential target for new therapies to treat osteoarthritis or even regrow cartilage.
In an effort to put to good use natural gas (methane) that might otherwise become pollution, Lawrence Livermore National Laboratory is collaborating with start-up company Calysta Energy on a new technology to convert natural gas to liquid fuel. The process involves taking natural gas from oil and gas operations, and converting it to methanol that can be used as a fuel or converted to other useful chemicals.
Solar energy has long been used as a clean alternative to fossil fuels such as coal and oil, but it could only be harnessed during the day when the sun’s rays were strongest. Now researchers have built a system that converts the sun’s energy not into electricity but hydrogen fuel and stores it for later use, allowing us to power our devices long after the sun goes down.
Humans have for ages taken cues from nature to build their own devices, but duplicating the steps in the complicated electronic dance of photosynthesis remains one of the biggest challenges and opportunities for chemists. Currently, the most efficient methods we have for making fuel from sunlight and water involve rare and expensive metal catalysts. However, that is about to change.
Plasmonic nanostructures are of great current interest as chemical sensors or imaging agents because they can detect the emission of light at a different wavelength than the excitation light. Researchers have struggled with how to interpret this resonant secondary light emission. Recent work that models the emission as Raman scattering from electron-hole pairs, however, has shown a way to predict emission outcome.
It's known that electric vehicles could travel longer distances before needing to charge and more renewable energy could be saved for a rainy day if lithium-sulfur batteries can just overcome a few technical hurdles. Now, a novel design for a critical part of the battery has been shown to significantly extend the technology's lifespan, bringing it closer to commercial use.
Researchers at the U.S. Department of Energy’s Brookhaven National Laboratory report that, for the first time, a comprehensive set of tools is available for exploring correlations among the morphological, structural, electronic and chemical properties of catalytic materials under working conditions. Two recent studies have used microscopy and spectroscopy to catch custom-built catalysts in action.
According to recent research that shows the first unambiguous theoretical evidence of quantum effects in photosynthesis, light-gathering macromolecules in plant cells transfer energy by taking advantage of molecular vibrations whose physical descriptions have no equivalents in classical physics.
By replacing platinum with molybdenum in photoelectrochemical cells, scientists from two Swiss labs have developed a cheaper and scalable technique that can greatly improve hydrogen production through water splitting as a means of storing solar energy.
A new method for analyzing biological samples' chemical makeup is set to transform the way medical scientists examine diseased tissue. When tests are carried out on a patient’s tissue today, such as to look for cancer, the test has to be interpreted by a histology specialist, and can take weeks to obtain a full result. Mass spectrometry imaging uses technologies that reveal how chemical components are distributed in a tissue sample.