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.
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.
Modern liquid crystals devices utilize high resistivity liquid crystals characterized by negligibly small concentration of mobile ions. However, these devices are prone to uncontrolled ionic contamination. This contamination can easily happen at any stage of the device fabrication or while operating the device. Ions in liquid crystals can compromise the overall performance of the device by leading to many negative side effects such as image sticking, image flickering, and slow response. Solving these problems requires the development of new methods, suitable for the permanent purification of liquid crystals from ions.
The manufacture of nanoparticles has reached a very high level of control of their shape, size and chemical nature. However, assembling nanoparticles in a controlled manner and with clearly defined functionalities in three-dimensional space remains quite a challenge. Researchers have now taken a first step towards the goal of protein-driven assembly of nanoparticles. In this ground-breaking work, they show that gold nanoparticles with a diameter of 10nm can be assembled using two different protein pairs.
In new work, an international team of researchers describes the drawing and Raman characterization procedure developed for placing single-walled carbon nanotubes (SWCNTs), proof of SWCNT alignment, optimization of the drawing parameters, and the subsequent placement in predefined lithographic structures for the demonstration of electrical conductivity. In essence, the team developed a simple nanopen for drawing and placing aligned single or multiple rod like molecules nanometrically.
By replacing dye inks with optical nanostructures, researchers have demonstrated the use of inkjet technology to create colored interference layers with high accuracy without the need for high-temperature fixing. The key to this technology is the ability to control the inkjet printing process to form nanostructures with high accuracy. Whereas conventional inkjet printing occurs in the microrange, this new work demonstrates that optical structures can be printed with much greater accuracy, which in particular opens the prospects in developing controlled interference printing of interference color images.
Hierarchical porous carbon/graphene (HPC/HPG) materials have been intensively investigated over the past decades. These materials are demonstrated as promising electrode materials for various systems, such as lithium-ion batteries, lithium-sulfur batteries, supercapacitors, and fuel cells, with a remarkable capacity, high efficiency, long stability, and excellent rate capability. Researchers have now proposed the employment of hierarchical porous calcium oxide (CaO) particles as effective catalytic template for the facile CVD growth of graphene.
In the past couple of decades, nickel-tungsten (Ni-W) amorphous and nanocrystalline materials have been drawing more and more research interest due to the superior mechanical properties such as high hardness, good mechanical performance, and excellent corrosion resistance. Striving to enhance the mechanical performance of Ni-W thin film alloys, researchers report how the annealing temperature will influence the microstructure evolution and the fracture properties of Ni-W alloys.