Researchers in the U.K. have developed a method of controlling the composition of a range of polymers, the large molecules that are commonly used as plastics and fibers. They have demonstrated how the chemical reactions can be manipulated, especially in fixing the composition of a polymer using a mixture of up to three different monomers. The secret lies in understanding and switching “on” and “off” the catalyst used to make the polymers.
A team of Belgian researchers have made what may be the first optical circuit that uses interconnections that are not only bendable, but also stretchable. These new interconnections, made of a rubbery transparent material called PDMS, guide light along their path even when stretched up to 30% and when bent around an object the diameter of a human finger.
NIST and American Univ. researchers report in a new study that the bench-scale test widely used to evaluate whether a burning cigarette will ignite upholstered furniture may underestimate the tendency of component materials to smolder when these materials are used in sofas and chairs supported by springs or cloth. The study comes as regulations and methods for evaluating ignition in furniture are undergoing scrutiny.
Look out, super glue and paint thinner. Thanks to new dynamic materials developed at the Univ. of Illinois, removable paint and self-healing plastics soon could be household products. Other self-healing material systems have focused on solid, strong materials, but this new study uses softer elastic materials made of polyurea, one of the most widely used classes of polymers in consumer goods such as paints, coatings, elastics and plastics.
In a world’s first, researchers at the National Institute of Materials Science in Japan have succeeded in controlling the length of a one-dimensional, or supramolecular, assembly of molecules. Their method involves molecular self-organization, which until now has not been practical for polymer synthesis because of a lack of knowledge about the interplay of organizational pathways.
Stratasys, a manufacturer of 3-D printers and materials for personal use, prototyping and production, has announced the launch of the ground-breaking Objet500 Connex3 Color Multi-material 3-D Printer, the first and only 3-D printer to combine colors with a variety of photopolymer 3-D printed materials.
A new development by researchers at the Univ. of California, Berkeley, could lead to curtains and other materials that move in response to light, no batteries needed. Engineers have created a new light-reactive material made up of carbon nanotubes and plastic polycarbonate.
A spin-off company from Singapore’s A*STAR research institute, has invented a new plastic film using a nano-inspired process that makes the material thinner but as effective as aluminium foil in keeping air and moisture at bay. The stretchable plastic could be an alternative for prolonging shelf-life of pharmaceuticals, food, and electronics, bridging the gap of aluminium foil and transparent oxide films.
Researchers from North Carolina State Univ. and the Chinese Academy of Sciences have found an easy way to modify the molecular structure of a polymer commonly used in solar cells. Their modification can increase solar cell efficiency by more than 30%. Polymer-based solar cells have two domains, consisting of an electron acceptor and an electron donor material.
To manufacture plastic parts with high-end surfaces, the entire forming tool is heated to 110 C using a technique known as variothermic tempering. To retrieve the finished plastic part, the mold must be cooled by up to 30 C, consuming lots of energy. Researchers have now developed a new kind of tempering technique that is up to 90% more energy efficient than variothermic tempering approaches.
Heating a sheet of plastic may not bring it to life, but it sure looks like it does in new experiments at Rice Univ. The materials created by Rice polymer scientist Rafael Verduzco and his colleagues start as flat slabs, but they morph into shapes that can be controlled by patterns written into their layers.
Researchers in Singapore and at IBM Research in California have discovered a new, potentially life-saving application for polyethylene terephthalate (PET), which is widely used to make plastic bottles. They have successfully converted PET into a non-toxic biocompatible material with superior fungal killing properties. This could help prevent and treat various fungus-induced diseases such as keratitis.
The research team was inspired by biological processes in species such as amphibians, which can regenerate severed limbs, engineers in Pittsburgh have developed computational models to design a new polymer gel that would enable complex materials to regenerate bulk sections of severed material using nanorods.
Massachusetts Institute of Technology chemical engineers have developed a novel way to generate nanoparticles that can recognize specific molecules, opening up a new approach to building durable sensors for many different compounds, among other applications. To create these “synthetic antibodies,” the researchers used carbon nanotubes.
A team of researchers has uncovered critical information that could help scientists understand how protein polymers interact with other self-assembling biopolymers. The research helps explain naturally occurring nanomaterial within cells and could one day lead to engineered bio-composites for drug delivery, artificial tissue, bio-sensing, or cancer diagnosis.
Polymer scientists have recently published an article that describes a new principle for the self-assembly of patterned nanoparticles. This principle may have important implications for the fundamental understanding of such processes, as well as future technologies.
Researchers from the Univ. of Helsinki, FInland, have managed to draw in an alcohol-based solution using laser light. Light-sensitive polymers are not new, but a new soluble, photosensitive polymer can be dissolved partially by a 365-nm laser, allowing a ray of light can “draw” in an ethanol-based dispersion of the polymer.
Renewable sources like sun and wind aren’t always productive. But waves in the ocean are never still, prompting Georgia Institute of Technology scientists to find a way to produce energy by making use of contact electrification between a patterned plastic nanoarray and water. They have introduced an inexpensive and simple prototype of a triboelectric nanogenerator that could be used to produce energy and as a chemical or temperature sensor.
A new toaster-sized 3-D printer, set for launch next year, is designed to greatly reduce the need for astronauts to load up with every tool, spare part or supply they might ever need. The printers would serve as a flying factory of infinite designs, creating objects by extruding layer upon layer of plastic from long strands coiled around large spools.
Researchers in Australia have developed a process for turning waste plastic bags into a high-tech nanomaterial. The furnace-driven process uses non-biodegradable plastic grocery bags to produce carbon layers that line pores in nanoporous alumina membranes. The result is carbon nanotube membranes.
Imagine an electronic display nearly as clear as a window, or a curtain that illuminates a room, or a smartphone screen that doubles in size, stretching like rubber. Now imagine all of these being made from the same material. Researchers from Univ. of California, Los Angeles have developed a transparent, elastic OLED that could one day make all these possible.
Anyone who’s stuffed a smartphone in their back pocket would appreciate the convenience of electronic devices that could bend. Alas, electronic components are generally made from stiff and brittle metals and inorganic semiconductors. Now, researchers have created the first theoretical framework seeking to understand, predict and improve the conductivity of semiconducting polymers.
Traditionally, the training of bomb-sniffing dogs has been a hazardous job, but newly developed odor-releasing materials could take the risk out of that work. Scientists at NIST are seeking to patent a novel system that can capture scents and release them over time.
Water pours into a cup at about the same rate regardless of whether the water bottle is made of glass or plastic. But at nanometer-size scales, material type does make a significant difference. A new study shows that in nanoscopic channels, the effective viscosity of water in channels made of glass can be twice as high as water in plastic channels, potentially affecting a variety of research approaches.
Scientists in Spain have reported the first self-healing polymer that spontaneously and independently repairs itself without any intervention. The researchers have dubbed the material a “Terminator” polymer in tribute to the shape-shifting, molten T-100 terminator robot from the Terminator 2 film.