The compound bisphenol A, which is found in plastics and resins, has been under scrutiny as chemists attempt to determine whether it is a health hazard for humans. According to researchers in France, even weak concentrations of bisphenol A are sufficient to produce a negative reaction in human testicles, reducing the production of testosterone hormones.
In a quest to develop low-friction components for ever smaller mechanical systems, a...
Amid concerns over the potential health effects of existing flame retardants for home...
A polymer thin film solar cell (PSC) produces electricity from sunlight by the...
Nearly everyone is familiar with the polytetrafluoroethylene (PTFE), otherwise known as Teflon. Famous for being “non-sticky” and water repellent, PTFE is a dry lubricant used on machine components everywhere. Recently, engineering researchers at the University of Arkansas found a way to make the polymer even less adhesive.
Cells are the basic unit of life and are separated from the outside world by a thin organic membrane. A major function of this membrane is to allow certain molecules to enter or leave the cell whilst other molecules are blocked from the cell interior. This allows metabolic processes to take place. Controlling membrane permeability is therefore a key challenge when building artificial cells in the form of enclosed chemical systems.
Coating medical supplies with an antimicrobial material is one approach that bioengineers are using to combat the increasing spread of multidrug-resistant bacteria. A research team in Singapore has now developed a highly effective antimicrobial coating based on cationic polymers. The coating can be applied to medical equipment, such as catheters.
U.S. Naval Research Laboratory scientists have developed a second-generation, cost-effective polyetheretherketone (PEEK)-like phthalonitrile-resin demonstrating superior high-temperature and flammability properties for use in marine, aerospace, and domestic applications. The resin can be used to make composite components by established industrial methods and automated composite manufacturing techniques.
A new chemical process can transform waste sulfur into a lightweight plastic that may improve batteries for electric cars, reports a University of Arizona-led team. The new plastic has other potential uses, including optical uses. The team has successfully used the new plastic to make lithium-sulfur batteries.
The accidental discovery by Chemical Engineering Professor Tim Bender and postdoctoral fellow Benoit Lessard of an unexpected side product of polymer synthesis could have implications for the manufacture of commercial polymers used in sealants, adhesives, toys, and even medical implants, the researchers say.
Japan-based Teijin Limited has developed technology to significantly enhance the heat and impact resistance of PLANEXT, the company’s high-performance bioplastic. The technology modifies the molecular design of PLANEXT to achieve greatly improved heat resistance with a glass-transition temperature of 120 C, as well as superior resistance to impact.
Ditch the 3D glasses. Thanks to a simple plastic filter, mobile device users can now view unprecedented, distortion-free, brilliant 3D content with the naked eye. This latest innovation from researchers in Singapore is the first ever glasses-free 3D accessory that can display content in both portrait and landscape mode, and measures less than 0.1 mm in thickness.
Scientists may soon be able to turn to one of the most powerful forces in biology—evolution—to help in their quest to develop new synthetic polymers. As described in a recent paper, a team of Harvard University researchers has developed a new method to create synthetic polymers using the coding of genetic material. The method may eventually be used to evolve synthetic polymers with new or improved properties such as the ability to serve as catalysts in chemical reactions or enhanced therapeutic potential.
Chemical companies each year churn out billions of tons of acrylate, a valuable commodity chemical involved in the manufacture of everything from polyester cloth to disposable diapers. It is usually made by heating propylene, a compound derived from crude oil. Researchers at Brown and Yale universities have demonstrated a new “enabling technology” that could instead use excess carbon dioxide to produce acrylate.
Researchers from North Carolina State University have come up with a low-cost way to enhance a polymer called MEH-PPV's ability to confine light, advancing efforts to use the material to convert electricity into laser light for use in photonic devices.
MEH-PPV is a low-cost polymer that can be integrated with silicon chips, and researchers have sought to use it to convert electricity into laser light for use in photonic devices. However, attempts to do this have failed because the amount of electricity needed to generate laser light in MEH-PPV was so high that it caused the material to degrade. Researchers have recently come up with a low-cost way to enhance MEH-PPV’s ability to confine light, protecting the material.
Germany-based company AMSilk has produced the world’s first competitive man-made spider silk fiber, called Biosteel, which is made entirely from recombinant silk proteins. Biosteel has mechanical properties similar to that of natural spider silk when comparing toughness, a measure indicating the kinetic energy absorbed before the fiber breaks.
Until recently, there has been no systematic way of evaluating how different anti-fog coatings perform under real-world conditions. A team of MIT researchers has developed such a testing method, and used it to find a coating that outperforms others not only in preventing foggy buildups, but also in maintaining good optical properties without distortion.
Engineers and scientists from the University of Sheffield have pioneered a new technique to analyze PCBM, a material used in polymer photovoltaic cells, obtaining details of the structure of the material which will be vital to improving the cell's efficiency.
When gluing things together, both surfaces usually need to be dry. Gluing wet surfaces or surfaces under water is a challenge. Korean scientists have now introduced a completely new concept. They were able to achieve reversible underwater adhesion by using supramolecular "Velcro".
A research team in Austria has developed an entirely new way of capturing images based on a flat, flexible, transparent, and potentially disposable polymer sheet. The new imager, which resembles a flexible plastic film, uses fluorescent particles to capture incoming light and channel a portion of it to an array of sensors framing the sheet. With no electronics or internal components, the imager’s elegant design makes it ideal for a new breed of imaging technologies.
Researchers at the Massachusetts Institute of Technology have pioneered a new method for producing polymer gels with tailored mechanical properties. The approach, which depends on the use of ultraviolet to break chemical bonds and prime them for new connections, could be used to make new materials that physically grow towards a light source in order to optimize their properties.
Traditionally, carbon fibers are made by “carbonizing” a polymer called poly-acrylonitrile, or PAN, by spinning it into a fiber and heating to form a homogenous carbons structure. Since its invention, improvement have been incremental, and version made with 100% carbon nanotubes are extremely expensive. A researcher at Northeastern University is working on a much cheaper, and stronger, alternative.
Northwestern University graduate student Jonathan Barnes had a hunch for creating an exotic new chemical compound, and his idea that the force of love is stronger than hate proved correct. He and his colleagues are the first to permanently interlock two identical tetracationic rings that normally are repelled by each other. Many experts had said it couldn't be done.
Researchers in Germany have developed a new generation of image sensors that are more sensitive to light than the conventional silicon versions. Simple and cheap to produce, they consist of electrically conductive plastics which are sprayed onto the sensor surface in an ultra-thin layer. The chemical composition of the polymer spray coating can be altered so that even the invisible range of the light spectrum can be captured.
In the same week that a team of researchers in France announced the harmful effects of bisphenol A (BPA) on hormone levels in human tissue, researchers in Texas have demonstrated through experiments that the BPA substitute bisphenol S also disrupts hormone activity at an extremely low level of exposure, and in an even more problematic way.
Scientists in Germany and Switzerland have developed an implant that is able to genetically modify specific nerve cells, control them with light stimuli, and measure their electrical activity all at the same time. This new tool relies on an innovative genetic technique that forces nerve cells to change their activity by shining light of different colors onto them.
A team of researchers in Austria has shown that so-called block copolymer stars—polymers that consist of two different blocks and are chemically anchored on a common point—have a robust and flexible architecture and they possess the ability to self-assemble at different levels. The team has called their invention, which can form complex crystal diamonds or cubes, the “soft Lego”.
Massachusetts Institute of Technology engineers have created a new polymer film that can generate electricity by drawing on a ubiquitous source: water vapor. The new material changes its shape after absorbing tiny amounts of evaporated water, allowing it to repeatedly curl up and down. Harnessing this continuous motion could drive robotic limbs or generate enough electricity to power micro- and nanoelectronic devices, such as environmental sensors.