By “drawing” micropatterns on nanomaterials using a focused laser beam, scientists in Singapore have modifed properties of nanomaterials for effective photonic and optoelectronic applications. Their method increased electrical conductivity and photoconductivity of the modified molybdenum disulfide material by more than 10 times and about five times respectively.
Scientists in Belgium have recently fabricated the...
A team including scientists from Spain and from...
The doubling of transistors on a microprocessor...
Together with teams from Finland and Japan, physicists from the Univ. of Basel in Switzerland were able to place 20 single bromine atoms on a fully insulated surface at room temperature to form the smallest “Swiss cross” ever created. The effort is a breakthrough because the fabrication of artificial structures on an insulator at room temperature is difficult. It is largest number of atomic manipulations ever achieved at room temperature.
You wouldn’t think that mechanical force could process nanoparticles more subtly than the most advanced chemistry. But researchers at Sandia National Laboratories have created a newly patented and original method that uses simple pressure to produce finer and cleaner results in forming silver nanostructures than do chemical methods, which are not only inflexible in their results but leave harmful byproducts.
Scientists at the Univ. of California, Riverside have constructed liquid crystals with optical properties that can be instantly and reversibly controlled by an external magnetic field. Unlike conventional liquid crystals, which rotate and align themselves when an electric field is applied, the new crystals are essentially a liquid dispersion of magnetic nanorods.
An international team has developed an elegant method for producing self-organized and functionalized carbon nanolayers and equipping them chemically with a range of functions. The effort depended on the development of a special compound, the molecules of which were aligned perfectly in parallel to each other in a single self-organized layer, like the bristles on a brush.
According to researchers, a simple, scalable method of making strong, stretchable graphene oxide fibers that are easily scrolled into yarns and have strengths approaching that of Kevlar is possible. An international collaboration has recently produced graphene oxide yarn fibers much stronger than other carbon fibers.
Titanium dioxide nanoparticles show great promise as optical encapsulants or fillers for tunable refractive index coatings. However, they've been largely shunned because they’ve been difficult and expensive to make. Scientists at Sandia National Laboratories have now come up with an inexpensive way to synthesize properly sized titanium dioxide nanoparticles and is seeking partners who can demonstrate the process at industrial scale.
Superlyophobic surfaces are simultaneously repellant for almost any liquid and exhibit high contact angles and low flow resist. But the demanding and usually expensive fabrication remains a bottleneck for further development. Researchers in Shenzhen, China, however, have now formulated a facile and inexpensive microfabrication method that uses polymers to help transfer the superlyophobic structures to curable materials.
Engineers at Oregon State University have successfully shown that a continuous flow reactor can produce high-quality nanoparticles by using microwave-assisted heating. This is essentially the same force that heats up leftover food with such efficiency, but instead of warming up yesterday’s pizza, this concept may change the production of cell phones and televisions or improve solar energy systems.
Polymer scientists in Ohio have demonstrated how a transparent layer of electrodes on a polymer surface could be extraordinarily tough and flexible, withstanding repeated scotch tape peeling and bending tests. According to its developers, the new material could replace conventional indium tin oxide coatings currently used for touchscreens.
Haydale, a U.K.-based developer of a unique plasma functionalization process for nanomaterials, has announced the publication of research showing its functionalized graphene nanoplatelets significantly improve the nanoscale reinforcement of resin. The report states a greater than two times increase in tensile strength and modulus of an epoxy composite using this technology.
A porous material invented by the Rice Univ. lab of chemist James Tour sequesters carbon dioxide, a greenhouse gas, at ambient temperature with pressure provided by the wellhead and lets it go once the pressure is released. The material shows promise to replace more costly and energy-intensive processes.
Bang & Olufsen is working with scientists in Denmark to develop a method for creating white aluminium surfaces. This has been exceedingly difficult for manufacturers because the existing technology used to color aluminium cannot be used to produce the color white because the molecules used to create “white” are too big. Rather than use pigments, then, researchers have a way to make it become white during the process.
With a growing number of consumers demanding more earth-friendly practices from the fashion world, scientists are developing new ways to produce textiles that could help meet rising expectations. They report in Industrial & Engineering Chemistry Research one such method that can dramatically reduce the amount of energy it takes to bleach cotton while improving the quality of the popular material.
Although the potential uses for graphene seem limitless, there has been no easy way to scale up from microscopic to large-scale applications without introducing defects. Researchers in Chicago and Korea have recently developed a supersonic spray system that produces very small droplets of graphene which disperse evenly, evaporate rapidly, and reduce aggregation tendencies. And, to the researchers’ surprise, it also eliminates defects.
Using a doped-graphene matrix to slow down and then trap atoms of the precious metal osmium, researchers in the U.K. have shown the ability to control and quantify the growth of metal-crystals. When the trapped atoms come into contact with further osmium atoms they bind together, eventually growing into 3-D metal-crystals. They have called this new technique nanocrystallometry.
Fancy Erector Set? Nope. The elaborate fractal structure shown at left is many, many times smaller than that and is certainly not child's play. It’s the latest example of a fractal nanotruss—nano because the structures are made up of members that are as thin as 5 nm; truss because they are carefully architected structures that might one day be used in structural engineering materials.
In response to requests from the semiconductor industry, a team of researchers at the Physical Measurement Laboratory has demonstrated that atomic force microscope probe tips made from its near-perfect gallium nitride nanowires are superior in many respects to standard silicon or platinum tips. They also found a way to use the tips as LEDs to illuminate sample regions while scanning.
Graphene’s promise as a material for new kinds of electronic devices, among other uses, has led researchers around the world to study the material in search of new applications. But one of the biggest limitations to wider use of the strong, lightweight, highly conductive material has been the hurdle of fabrication on an industrial scale.
Although lubricants for machinery are widely used, almost no fundamental innovations for this type of product has been made in the last 20 years, according researchers in Germany who have been working on a new class of lubricating substance. Their new liquid crystalline lubricant enable nearly frictionless sliding because although it is a liquid, the molecules display directional properties like crystals do.
Modern supercapacitors store ten times less energy than a lithium-ion battery but can last a thousand times longer. The main drawback of supercapacitors, however, is the inability to cope with stresses such as pressure and vibration. Researchers have developed a new supercapacitor that operates flawlessly in storing and releasing electrical charge while subject to stresses or pressures up to 44 psi and vibrational accelerations over 80 g.
Scientists at IBM Research have used a new “computational chemistry” hybrid approach to accelerate the materials discovery process that couples laboratory experimentation with the use of high-performance computing. The new polymers are the first to demonstrate resistance to cracking, strength higher than bone, the ability to reform to their original shape (self-heal), and the ability to be completely recycled back to the starting material.
When making cellulosic ethanol from plants, one problem is what to do with a woody agricultural waste product called lignin. The old adage in the pulp industry has been that one can make anything from lignin except money. A new review article in Science points the way toward a future where lignin is transformed from a waste product into valuable materials such as low-cost carbon fiber for cars or bio-based plastics.
Scientists at the Korea Advanced Institute of Science and Technology have increased the energy efficiency of a piezoelectric nanogenerator by almost 40 times, moving it closer to commercial flexible energy harvesters that can supply power infinitely to wearable, implantable electronic devices. The technique used to make this improvement, laser lift-off, allows the placement of a high-quality piezoelectric film on a sapphire substrate.
Scientists at NASA Langley Research Center have developed a new material technology that alters a surface’s topography and chemistry to promote or mitigate adhesion. LaRC is holding a workshop and meeting on May 22 that explains how these newly available materials work to enhance or remove adhesion. Manufacturers and developers are welcome to attend.
Are you an adhesives or coatings manufacturer? Do you need to adhesively join parts? Or, do you need durable non-stick coatings? Then, make plans to attend this meeting! Learn about new advanced materials and processing methods to either enhance adhesion or to create non-stick surfaces.
- Page 1