High-temperature heaters, such as furnaces, are widely used in chemical reactions, materials synthesis and device processing. The limitations of these heating devices often are their bulky size, weight, low maximum heating temperatures and slow ramp rates. To overcome these limitations, and to provide a heating element with a high temperature range to the target object in a micro- and nanoscale environment, researchers have developed a 3D-printable high-temperature, high-rate heater that can be applied to a wide range of nanomanufacturing when precise temperature control in time, placement, and the ramping rate is important.
When inkjet printing graphene, achieving satisfactory results it is a trade-off between the sizes of the graphene sheets and the chosen printing strategies. Direct ink writing offers an attractive way to break the routine and meet the printability with the demanding sheet sizes. The nozzles' diameters range from sub micrometer to millimeter scale to accommodate the inks. More importantly, the extrusion-based procedure plays a crucial role in directing the orientation of graphene sheets to pass through the nozzle during printing.
Quantum computation using artificial-atoms can be sensitively controlled by external electromagnetic fields. These fields and the self-fields attributable to the coupled artificial-atoms influence the amount of quantum correlation in the system. However, control elements that can operate without complete destruction of the entanglement of the quantum-bits are difficult to engineer. In new work, scientists have investigate the possibility of using closely spaced-linear arrays of metallic-elliptical discs as whispering gallery waveguides to control artificial atoms.
Superhydrophobic surfaces that can also withstand mechanical deformation such as bending and stretching are important for applications such as robust self-cleaning, water-resistant electronics, and flexible microfluidics. Researchers have now reported the design of 3D hierarchical wrinkle substrates that can maintain their superhydrophobicity even after being repeatedly stretched. This is made possible by using monolithic, multi-scale PDMS nanowrinkles that can exhibit stretchable superhydrophobicity using high fidelity pattern transfer.
MoS2 nanosheets have shown great prospect as a near-infrared light (NIR) absorbing agent for PTT applications due to their unique photoelectric property, low cost and good biocompatibility. However, the absorbance of nanosheets in the NIR region is not specific and strong, and the photothermal conversion efficiency of MoS2 based materials need to be enhanced. In new work, researchers have proposed a novel MoS2 nanostructure, i.e. layered MoS2 hollow spheres (LMHSs), for improving their near-infrared absorption and photothermal conversion efficiency.
Today, the best performing battery in terms of specific energy and specific power is the secondary lithium-metal (Li-metal). However, uncontrolled dendrite growth during Li depositing/stripping in rechargeable Li metal based batteries has prevented their practical applications over the past 40 years. To address this issue, researchers have now proposed a novel method of modulating the lithium ion adsorption to suppress lithium dendrite growth by employing glass fiber as solid electrolytes with plenty of polar functional groups as the interlayer between Li metal anode and routine polymer separator.
Ultrasonics is a promising, non-invasive characterization technique for fluids. The scattering of ultrasound through colloidal suspensions allows determination of accurate particle size distribution, density, and concentration. Controlling these properties enables accurate characterization of nanomedicine drugs and understanding of nanoparticles present in biological systems. Ultrasound is particularly helpful in analyzing optically opaque samples, which have to be heavily diluted in order to be analyzed with optical methods. New work demonstrates for the first time new phenomena in the ultrasonic scattering in nanofluids.
Lithium-sulfur (Li-S) batteries, which employ sulfur as cathode and metallic lithium as anode materials, have been extensively studied as promising alternatives to the widely used lithium-ion batteries because - theoretically - they can render 3-6 times higher energy density. In practice, though, it has proven challenging to approach that theoretical value. Specifically, the rapid capacity fading, low Coulombic efficiency, and irreversible loss of active materials have impeded large-scale commercial use of Li-S batteries. Researchers now have shown that trapping lithium polysulfide species on (nanoscale) host materials is an effective way to overcome these challenges.