Inorganic chalcogenide (WS2) nanotubes have shown revolutionary chemical and physical properties that offer a broad range of applications. They are ultra-strong impact-resistant materials.
This makes them excellent candidates for producing bullet proof vests, helmets, car bumpers, high strength glues and binders, and other safety equipment. The unique nanotubes are up to four to five times stronger than steel and about six times stronger than Kevlar, the nowadays most popular material used for bullet proof vests.
In addition to ballistic protection materials and polymer composites, WS2 nanotubes can be implemented in nanoelectronics, fuel cells, ultra-filtration membranes, and catalysts. Their optical properties allow various other applications in fields such as nanolithography or photocatalysis.
Up to now a major obstacle in the application of chalcogenide nanotubes has been their inherently inertness to chemical and biological modification and functionalization. Their potential use in composite materials might be greatly enhanced by improving the chalcogenide/matrix interface bonding. Scientists at Johannes Gutenberg University Mainz (JGU) devised a novel modification strategy based on metal oxide nanoparticles as universal vehicles for a reversible functionalization of WS2 nanotubes. The groundbreaking research conducted in the group of Wolfgang Tremel, Professor in the Department of Chemistry at JGU, and Dr. Ute Kolb at the Electron Microscopy Center was published in advance online on August 16 and will appear on the cover of the journal Angewandte Chemie.
The strategy underlying the reversible binding between chalcogenide nanotubes and metal oxide nanoparticles is based on "Pearson hardness," an elementary concept introduced more than 40 years ago to classify the Lewis acids and bases (especially the various commonly used metal ions and ligands) into three broad categories - hard, soft, and borderline. Metal oxides nanoparticles stick to the surface of chalcogenide nanotubes. As these metal oxide particles can carry many other functional molecules (e.g. polymers, biomolecules) as well, they can act as interfacial glue between the nanotubes and organic matter. This interfacial glue, however, can be detached purposely by the addition of substances that exhibit a stronger binding to the oxide nanoparticles than the WS2 nanotubes.
Hitherto all strategies of bonding to carbon or chalcogenide nanotubes were irreversible, i.e. once molecules have been bound they cannot be released again. The new, fully reversible attachment/detachment process will be applied in "smart materials" the toughness of which is reduced upon the influence of an external trigger. The findings will also provide a better understanding of fundamental friction issues, and - from a more practical point of view - offer a new tool for assembling nanotubes into devices and study the forces acting on them.
From ancient fossils to future cars
21.10.2016 | University of California - Riverside
Study explains strength gap between graphene, carbon fiber
20.10.2016 | Rice University
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences