Showing Spotlights 161 - 168 of 2416 in category All (newest first):
Researchers demonstrate that the amorphous carbon contaminants on CVD-produced graphene, which could greatly degrade its properties, can be removed by an activated carbon-coated lint roller, relying on the strong interactions between the amorphous carbon and activated carbon. Large-area graphene surfaces treated with this lint roller exhibit a high cleanliness of 99% with a low degree of polymer residue after transfer onto a functional substrate. This superclean graphene has extremely low contact resistance and ultrahigh carrier mobility.
Sep 26th, 2019
To make epoxy-graphene nanocomposites, the graphene nanosheets are commonly mixed homogeneously with the epoxy matrix. However, one of the problems that bedevils these nanocomposites is the issue of agglomeration of the nanofillers. Researchers now report that they have sucessfully tackled this dispersion problem by constructing a continuous graphene-based scaffold. The results show that the team's novel strategy boosts the fracture toughness to about 3.6 times that of pure epoxy.
Sep 25th, 2019
MXenes' inherently good conductivity and excellent volumetric capacitance makes them a very attractive material for fabricating textile-based, wearable electronics (e-textiles) that can be worn like everyday garments. This requires the fabrication of conductive yarns that are robust enough to be suitable for the wear and tear experienced by everyday textiles. A new study demonstrates highly conductive MXene-based yarns that can be washed and knitted just like conventional yarns - offering a potential platform technology for e-textile-based devices with tunable performance.
Sep 11th, 2019
Among the various therapeutic advances, regenerative medicine and nanotechnologies have demonstrated a considerable capacity to salvage or regenerate damaged heart tissue in animal models. The superior characteristics of nanobiomaterials have shown great promise in developing engineered cardiovascular constructs for a variety of tissue engineering applications. But in order to develop efficient nanotechnology-based regenerative medicine platforms in humans, clinicians and engineers must achieve a greater common understanding of the problems, challenges, and opportunities in both fields.
Sep 10th, 2019
The precise mechanisms underlying friction at the nanoscale are still not completely understood. While gears, bearings, and liquid lubricants can reduce friction in the macroscopic world, the origins of micro-and nanoscale friction for small devices require other solutions. This primer explains the concept of friction, in nature and man-made systems, especially at the nanoscale. It then discusses a new class of 'smart' materials with the ability to modulate the friction of a surface.
Aug 29th, 2019
By studying flexible and transparent photodetectors based on single-layer MoS2 under the application of biaxial strain, researchers have developed atomically thin photodetectors whose characteristics can be controlled by means of an externally applied strain. This strain can be reversibly applied through the thermal expansion (shrinkage) of the substrate material, which induces tensile (compressive) biaxial stress. These results emphasize the possibilities of a new kind of electronics - straintronics - in which mechanical deformations are used to modify not only the geometry of the device, but its properties and performance as well.
Aug 22nd, 2019
Despite considerable, decade-long efforts in the field of nanomedicine, fewer nanoparticle technologies than expected have made it to clinical trials. Understanding the role of the nano-bio interface - the protein corona - appears to be a critical factor for successful clinical translation of medical nanotechnologies. New research demonstrates that the protein corona controls the interaction of liposomes with immune cells and reveals that the pre-coating of liposomes with an artificial corona made of human plasma proteins significantly decreases capture by circulating leukocytes in whole blood.
Aug 21st, 2019
The latest addition in exciting properties of 2D materials has been superconductivity - the complete absence of resistance at low temperatures - clearly exciting for dissipationless (low-power, heating free) electronics. Researchers hypothesized that a layer of hydrogen adatoms could strongly alter the electronic and vibrational features of an atomically thin material, thereby boosting its superconductivity. This idea was tested on a monolayer of magnesium diboride, where hydrogenation was demonstrated to elevate the temperature to where superconductivity appears above a hundred Kelvin - several times higher than in the absence of hydrogen.
Aug 20th, 2019