The phonon, like the photon or electron, is a physical particle that travels like waves, representing mechanical vibration. Phonons transmit everyday sound and heat. Recent progress in phononics by a research scientist at Georgia Institute of Technology has led to the development of new ideas and devices that are using phononic properties to control sound and heat, even to the point of freeing bustling city blocks from the noise of traffic.
Researchers have recently provided the first...
In recent years, thermoelectric materials have enabled the re-use of otherwise wasted...
A team led by Lawrence Berkeley National Laboratory Materials Sciences Division’s Jeffrey Urban and Rachel Segalman have discovered highly conductive polymer behavior occurring at a polymer/nanocrystal interface. The composite organic/inorganic material is a thermoelectric—a material capable of converting heat into electricity—and has a higher performance than either of its constituent materials.
Thermoelectric materials can be used to turn waste heat into electricity or to provide refrigeration without any liquid coolants, and a research team from the University of Michigan has found a way to nearly double the efficiency of a particular class of them that's made with organic semiconductors.
For years, researchers have developed thin films of bismuth telluride, which converts heat into electricity or electricity to cooling, on top of gallium arsenide to create cooling devices for electronics. But it was not clear how this could be done because the atomic structures do not appear to be compatible. Researchers from North Carolina State University and RTI International have now solved the mystery.
Thermoelectric efficiency has improved enough to enable limited commercial use, but lack of better materials has prevented widespread adoption. New development work at Massachusetts Institute of Technology could help reduce thermal conductivity while keeping electrical conductivity high. In addition to computer modeling, the researchers draw upon methods developed by optics researchers who have been attempting to create invisibility cloaks—ways of making objects invisible to certain radio waves or light waves using nanostructured materials that bend light.
Researchers at the Aalto University School of Chemical Technology have applied atomic layer deposition (ALD) technique to the synthesis of thermoelectric materials. Converting waste energy into electricity, these materials are a promising means of producing energy cost-effectively and without carbon dioxide emissions in the future.
By using common materials found pretty much anywhere there is dirt, a team of Michigan State University researchers have developed a new thermoelectric material. The new material mimic natural minerals known as tetrahedrites and can be processed economically by grinding them to a powder, then using pressure and heat to compress them into useable sizes.
Thermoelectric devices, which can harness temperature difference to produce electricity, might be made more efficient thanks to new research from Massachusetts Institute of Technology on heat propagation through structures called superlattices. The new findings show, unexpectedly, that heat can travel like waves, rather than particles, through these nanostructures.
Northwestern University scientists have developed a thermoelectric material that is, according to the university, the best in the world at converting waste heat to electricity, which is good news once one realizes nearly two-thirds of energy input is lost as waste heat. The material could signify a paradigm shift.
Graphene, a single-atom-thick layer of carbon, has spawned much research into its unique electronic, optical, and mechanical properties. Now, researchers at Massachusetts Institute of Technology have found another compound that shares many of graphene's unusual characteristics—and in some cases has interesting complementary properties to this much-heralded material.
Engineers at Purdue University have coated glass fibers with a new thermoelectric material formed by dipping glass fibers in a solution containing nanocrystals of lead telluride and then exposing them to heat in a process called annealing to fuse the crystals together. The resulting material is far less brittle and more effiicient to produce than conventional thermoelectrics.
In the continual quest for better thermoelectric materials—which convert heat into electricity and vice versa—researchers have identified a liquid-like compound whose properties give it the potential to be even more efficient than traditional thermoelectrics.
Scientists from the Chinese Academy of Science's Shanghai Institute of Ceramics, in collaboration with scientists from Brookhaven National Laboratory, the University of Michigan, and the California Institute of Technology, have identified a new class of high-performance thermoelectric materials. In their study, liquid-like copper ions carry electric current around a solid selenium crystal lattice.
Made from carbon nanotubes locked up in flexible plastic fibers and made to feel like fabric, an invention called Power Felt from Wake Forest University uses temperature differences—room temperature versus body temperature, for example—to create a charge.
A team of Massachusetts Institute of Technology researchers has developed a way of making a high-temperature version of a kind of materials called photonic crystals, using metals such as tungsten or tantalum. The new materials—which can operate at temperatures up to 1,200 C—could find a wide variety of applications powering portable electronic devices, spacecraft to probe deep space, and new infrared light emitters that could be used as chemical detectors and sensors.
The surprising discovery of a new way to tune and enhance thermal conductivity—a basic property generally considered to be fixed for a given material—could give engineers a new tool for managing thermal effects in smart phones and computers, lasers, and a number of other powered devices.
A repository developed by Duke University engineers that they call a "materials genome" could allow scientists to stop using trail-and-error methods for combining electricity-producing materials. The thermoelectrics database project covers thousands of compounds, and provides detailed "recipes" for creating most efficient combinations for a particular purpose.
Systems to harness the sun's energy typically generate either electricity or heat in the form of steam or hot water. But a new analysis by researchers at the Massachusetts Institute of Technology shows that there could be significant advantages to systems that produce both electricity and heat simultaneously.
Massachusetts Institute of Technology researchers have found that shining light on a sheet of graphene, treated so that it had two regions with different electrical properties, creates a temperature difference that, in turn, generates a current. Previously, this effect had been thought to be photovoltaic in nature.
The editors of R&D Magazine have opened the nominations for the 2012 R&D 100 Awards competition, which will celebrate the 50th anniversary of the awards. If your organization introduced a new product this year, or is planning to, you can begin the entry process now.
Neutron analysis of the atomic dynamics behind thermal conductivity is helping scientists at the Department of Energy's Oak Ridge National Laboratory gain a deeper understanding of how thermoelectric materials work. The analysis could spur the development of a broader range of products with the capability to transform heat to electricity.
Recently, scientists have concocted a recipe for a thermoelectric material that might be able to operate off nothing more than the heat of a car's exhaust. In a paper, a team reported on a compound that shows high efficiency at less extreme temperatures.
High-performance nanotech materials arrayed on a flat panel platform demonstrated seven to eight times higher efficiency than previous solar thermoelectric generators, opening up solar-thermal electric power conversion to a broad range of residential and industrial uses, a team of researchers from Boston College and MIT report.
Thermoelectric materials are a hot new technology that is now being studied intensively by researchers funded by the U.S. Department of Energy's Energy Frontier Research Centers. An Oak Ridge National Laboratory researcher is using neutron scattering and computer simulation to investigate the microscopic structure and dynamics of thermoelectric materials so that researchers can make them more efficient for new, energy-saving applications.
How important are rare earth elements? A research team based at Ames Lab recently achieved a 25% improvement in the ability of a certain type of thermoelectric, TAGS (tellurium, antimony, germanium and silver), to convert heat into electrical energy by adding a small amount of rare earth cerium or ytterbium.