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.
Bubble-pen lithography (BPL) is a novel optically controlled nanofabrication technique that can be widely applied to pattern colloidal and biological particles on substrates in order to build functional optic, electronic, and magnetic devices. In BPL, an optically controlled microbubble is generated to capture and immobilize colloidal particles on the plasmonic substrates. With this new lithographic technique, the researchers can generate bubbles down to 1 micron in diameter. The smaller bubbles provide an enhanced patterning resolution.
Researchers have approached the preparation of artificial analogs of nacre by using various methods and the resulting materials have captured some of the characteristics of the natural composite - but so far never have fully replicated it. Now, researchers have reported the first successful attempt to mimic the structure of nacre while maintaining the same characteristic geometry, aspect ratio and phase proportions. They used 10-20 nm thick layered double hydroxide (LDH) platelets with an aspect ratio similar to the aragonite platelets in nacre and 'glued' them together with a simple organic 'mortar' (PSS).