Showing Spotlights 33 - 40 of 534 in category All (newest first):
As an advanced fabrication technique, 3D printing has been increasingly utilized to fabricate complex 3D objects via digitally controlled deposition of phase change and reactive materials and solvent-based inks. When it comes to batteries, 3D printing has several significant advantages compared with conventional battery fabrication technologies and it opens new avenues for the rapid fabrication of 3D-structured batteries with complex architectures and high performance. In next generation futuristic 3D printed energy architectures batteries and supercapacitors could be printed in virtually any shape.
Nov 4th, 2019
Hierarchical structures, spanning multiple length scales from nano- to macroscales, are very common in nature; but only in recent years have they been systematically studied in materials science, in order to understand the specific effects they can have on the mechanical properties of various systems. Researchers have developed a straightforward, cost-efficient, and fast route to fabricate hierarchical porous structures in a 3D printer. With this technique they can process nanoporous materials and fabricate structures from nanometer to centimeter scale.
Oct 22nd, 2019
As a coating, hydrogels bring many advantages to regular solid surfaces, uniting the superior properties of the substrate with the superior properties of the hydrogel. However, making hydrogel coatings outside a laboratory environment can be difficult. Inspired by the economics of paint manufacturing, we have developed a technique for hydrogel coating preparation that breaks the process up into several steps. This step-wise synthetic pattern, decoupling polymerization from crosslinking and interlinking, divides the labor between the hydrogel coating maker and its user.
Oct 8th, 2019
A novel and very promising design strategy for stretchable electronics is based on liquid metals; specifically the use of the oxide shell of liquid gallium alloys to fabricate polymerized liquid metal networks (Poly-LMNs). The novel attribute of these Poly-LMNs is that they increase in conductivity as they are elongated, resulting in the measured resistance across the conductor remaining nearly unchanged as they are stretched to 700% their original length. The implication of this effect is that a circuit can now be designed with a stretchable Poly-LMN wire that won?t change its resistance when stretched.
Oct 3rd, 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
Manganese oxides have numerous applications in batteries, supercapacitors, microelectronics and (electro)catalysis. Researchers describe a cheap and fast method for depositing conformal thin films of manganese oxide on nanostructured substrates with close-to-a-monolayer precision, competing with the state-of-the-art atomic layer deposition (ALD). The team's redox layer deposition (RLD) is performed in air, at room temperature, using common and cheap chemicals and simple glassware - literally two beakers.
Aug 13th, 2019
MXenes are a promising class of 2D materials with unique intrinsic physical and chemical properties, including excellent conductivity, hydrophilicity and high density when compared to graphene. 3D-printed architectures composed of MXenes are particularly attractive for energy storage applications such as rechargeable lithium- and sodium-ion batteries, lithium-sulfur batteries and supercapacitors. Researchers now have demonstrated for the first time the possibility to print three-dimensional freestanding MXene objects.
Aug 6th, 2019
The recent interest of nanotechnology researchers in liquid metals is based on the properties that differentiate them from common liquids such as water or organics. In addition to their chemical reactivity, the electronic behavior of these liquids, combined with the strong interatomic interactions throughout the bulk, lead to liquids with high densities, thermal and electrical conductivities, and optical reflectivity (over a wide range of wavelengths). This offers potential new approaches for the synthesis of nanomaterials and investigations of fundamental physics and chemistry at small length scales.
Jul 11th, 2019