Theoretical physicists at Rice Univ. are living on the edge as they study the astounding properties of graphene. In a new study, they figure out how researchers can fracture graphene nanoribbons to get the edges they need for applications. New research shows it should be possible to control the edge properties of graphene nanoribbons by controlling the conditions under which the nanoribbons are pulled apart.
With its high electrical conductivity and optical transparency, indium tin oxide is one of the most widely used materials for touchscreens, plasma displays and flexible electronics. But its rapidly escalating price has forced the electronics industry to search for other alternatives. One potential and more cost-effective alternative is a film made with silver nanowires embedded in flexible polymers.
A research team has developed a new technique for determining the role that a material’s structure has on the efficiency of organic solar cells, which are candidates for low-cost, next-generation solar power. The researchers have used the technique to determine that materials with a highly organized structure at the nanoscale are not more efficient at creating free electrons than poorly organized structures.
One of the reasons solar cells are not used more widely is cost: The materials used to make them most efficient are expensive. Engineers are exploring ways to print solar cells from inks, but the devices don’t work as well. A team of engineers has developed a technique to increase the performance and electrical conductivity of thin films that make up these materials using nanotechnology.
Scientists have identified synthetic materials that may purify ethanol more efficiently and greatly improve the separation of long-chain hydrocarbons in petroleum refining. The results show that predictive modeling of synthetic zeolites is highly effective and can help solve some of the most challenging problems facing industries that require efficient ways to separate or catalyze materials.
Sound waves passing through the air, objects that break a body of water and cause ripples or shockwaves from earthquakes all are considered “elastic” waves. These waves travel at the surface or through a material without causing any permanent changes to the substance’s makeup. Now, researchers have developed a material that has the ability to control these waves.
Just because concrete is the most widely used building material in human history doesn’t mean it can’t be improved. A recent study conducted by researchers from NIST, the Univ. of Strasbourg and Sika Corp. using U.S. Dept. of Energy Office of Science supercomputers has led to a new way to predict concrete’s flow properties from simple measurements.
Reducing the amount of sunlight that bounces off the surface of solar cells helps maximize the conversion of the sun's rays to electricity, so manufacturers use coatings to cut down on reflections. Now scientists at Brookhaven National Laboratory show that etching a nanoscale texture onto the silicon material itself creates an antireflective surface that works as well as state-of-the-art thin-film multilayer coatings.
By zapping ordinary metals with femtosecond laser pulses researchers from the Univ. of Rochester have created extraordinary new surfaces that efficiently absorb light, repel water and clean themselves. The multifunctional materials could find use in durable, low maintenance solar collectors and sensors.
The discovery of "topologically protected" electrical conductivity on the surface of some materials whose bulk interior acts as an insulator was among the most sensational advances in the last decade of condensed matter physics, with predictions of numerous unusual electronic states and new potential applications. But many of these predicted phenomena have yet to be observed, until now.
Organic semiconductors are prized for light-emitting diodes, field effect transistors and photovoltaic cells. As they can be printed from solution, they provide a highly scalable, cost-effective alternative to silicon-based devices. Uneven performances, however, have been a persistent problem.
A new insight into the fundamental mechanics of the movement of molecules recently published by researchers at NIST offers a surprising view of what happens when you pour a liquid out of a cup. More important, it provides a theoretical foundation for a molecular-level process that must be controlled to ensure the stability of important protein-based drugs at room temperature.
A single layer of metallic nanostructures has been designed, fabricated and tested by a team of Penn State Univ. electrical engineers that can provide exceptional capabilities for manipulating light. This engineered surface, which consists of a periodic array of strongly coupled nanorod resonators, could improve systems that perform optical characterization in scientific devices, sensing or satellite communications.
A team of chemical engineering researchers has developed a technique that uses a new catalyst to convert methane and water into hydrogen and a fuel feedstock called syngas with the assistance of solar power. The catalytic material is more than three times more efficient at converting water into hydrogen gas than previous thermal water-splitting methods.
The time frames, in which electrons travel within atoms, are unfathomably short. For example, electrons excited by light change their quantum-mechanical location within mere attoseconds. But how fast do electrons whiz across distances corresponding to the diameter of individual atomic layers?
Today, we're surrounded by a variety of electronic devices that are moving increasingly closer to us. Many types of smart devices are readily available and convenient to use. The goal now is to make wearable electronics that are flexible, sustainable and powered by ambient renewable energy. This last goal inspired a group of researchers to explore zinc oxide as an effective material choice.
Researchers have demonstrated a new way to enhance the emission of single photons by using "hyperbolic metamaterials," a step toward creating devices in work aimed at developing quantum computers and communications technologies. Optical metamaterials harness clouds of electrons called surface plasmons to manipulate and control light.
Making cement is a centuries-old art that has yet to be perfected, according to researchers at Rice Univ. who believe it can be still more efficient. Former Rice graduate student Lu Chen and materials scientist Rouzbeh Shahsavari calculated that fine-tuning the process by which round lumps of calcium silicate called clinkers are turned into cement can save a lot of energy.
A research team led by North Carolina State Univ. has made two advances in multiferroic materials, including the ability to integrate them on a silicon chip, which will allow the development of new electronic memory devices. The researchers have already created prototypes of the devices and are in the process of testing them. Multiferroic materials have both ferroelectric and ferromagnetic properties.
One challenge in improving the efficiency of solar cells is some of the absorbed light energy is lost as heat. So scientists have been looking to design materials that can convert more of that energy into useful electricity. Now a team from Brookhaven National Laboratory and Columbia Univ. has paired up polymers that recover some of that lost energy by producing two electrical charge carriers per unit of light instead of the usual one.
A team of chemistry and materials science experts from Univ. of California, Santa Barbara and The Dow Chemical Company has created a novel way to overcome one of the major hurdles preventing the widespread use of controlled radical polymerization.
Narrow strips of graphene called nanoribbons exhibit extraordinary properties that make them important candidates for future nanoelectronic technologies. A barrier to exploiting them, however, is the difficulty of controlling their shape at the atomic scale, a prerequisite for many possible applications.
A new type of nanowire crystals that fuses semiconducting and metallic materials on the atomic scale could lay the foundation for future semiconducting electronics. Researchers at the Univ. of Copenhagen are behind the breakthrough, which has great potential. The development and quality of extremely small electronic circuits are critical to how and how well future computers and other electronic devices will function.
Even when building big, every atom matters, according to new research on particle-based materials at Rice Univ. Rice researchers have published a study showing what happens at the nanoscale when “structurally complex” materials like concrete rub against each other. The scratches they leave behind can say a lot about their characteristics.
In a promising lithium-based battery, the formation of a highly conductive silver matrix transforms a material otherwise plagued by low conductivity. To optimize these multi-metallic batteries, scientists needed a way to see where, when and how these silver, nanoscale "bridges" emerge. Now, researchers have used x-rays to map this changing atomic architecture and revealed its link to the battery's rate of discharge.