The same tiny cellulose crystals that give trees and plants their high strength, light weight and resilience, have now been shown to have the stiffness of steel. Calculations using precise models based on the atomic structure of cellulose show the crystals have a stiffness of 206 gigapascals, which is comparable to steel.
Physicists in Germany have developed a “planet-satellite model” to precisely connect and arrange nanoparticles in 3-D structures. Inspired by the photosystems of plants and algae, these artificial nanoassemblies of DNA strands might in the future serve to collect and convert energy.
A research team in France has invented an adhesion method that creates a strong bond between two gels by spreading on their surface a solution containing nanoparticles. Until now, there was no entirely satisfactory method of obtaining adhesion between two gels or two biological tissues. The bond is resistant to water and uses no polymers or chemical reactions.
Univ. of Oregon chemists studying the structure of ligand-stabilized gold nanoparticles have captured fundamental new insights about their stability. The information, they say, could help to maintain a desired, integral property in nanoparticles used in electronic devices, where stability is important.
Oil and water don’t mix, as any chemist or cook knows. Tom Russell, a polymer scientist from the Univ. of Massachusetts who now holds a visiting faculty appointment with Lawrence Berkeley National Laboratory’s Materials Sciences Div., is using that chemical and culinary truth to change the natural spherical shape of liquid drops into ellipsoids, tubes and even fibrous structures similar in appearance to glass wool.
Humble aluminum’s plasmonic properties may make it far more valuable than gold and silver for certain applications, according to new research by Rice Univ. scientists. Because aluminum, as nanoparticles or nanostructures, displays optical resonances across a much broader region of the spectrum than either gold or silver, it may be a good candidate for harvesting solar energy and for other large-area optical devices and materials.
Chemical engineers at Rice Univ. have found a new catalyst that can rapidly break down nitrites, a common and harmful contaminant in drinking water that often results from overuse of agricultural fertilizers. Nitrites and their more abundant cousins, nitrates, are inorganic compounds that are often found in both groundwater and surface water. The compounds are a health hazard.
Cooling systems generally rely on water pumped through pipes to remove unwanted heat. Now, researchers at Massachusetts Institute of Technology and in Australia have found a way of enhancing heat transfer in such systems by using magnetic fields, a method that could prevent hotspots that can lead to system failures. The system could also be applied to cooling everything from electronic devices to advanced fusion reactors, they say.
Batteries that power electric cars have problems. They take a long time to charge. The charge doesn’t hold long enough to drive long distances. They don’t allow drivers to quickly accelerate. They are big and bulky. By creating nanoparticles with controlled shape, engineers in California believe smaller, more powerful and energy-efficient batteries for vehicles can be built.
Sometimes big change comes from small beginnings. That’s especially true in the research of Anatoly Frenkel, a prof. of physics at Yeshiva Univ., who is working to reinvent the way we use and produce energy by unlocking the potential of some of the world’s tiniest structures: nanoparticles.
Using the x-ray beams at the European Synchrotron Research Facility a research team has showed that the electrons absorbed and released by cerium dioxide nanoparticles during chemical reactions behave in a completely different way than previously thought. They show that the electrons are not bound to individual atoms but, like a cloud, distribute themselves over the whole nanoparticle, like an electron “sponge".
A remedy for the problem of rust may be available soon. Scientists from the Max-Planck-Institut für Eisenforschung GmbH in Düsseldorf and the Max Planck Institute for Polymer Research in Mainz have succeeded in making two strides toward developing a self-healing anticorrosion coating.
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.
An interdisciplinary team of University of Pennsylvania researchers has already developed a technique for controlling liquid crystals by means of physical templates and elastic energy, rather than the electromagnetic fields that manipulate them in televisions and computer monitors. They envision using this technique to direct the assembly of other materials, such as nanoparticles.
A two-year collaboration between the Chan and the Rocheleau labs at the Institute of Biomaterials & Biomedical Engineering has led to the development of a new microfluidics screening platform that can accurately predict the way nanoparticles will behave in a living body.
A groundbreaking nanoparticle system which stimulates the growth of microalgae has been developed by a team of Australian scientists. The technique creates an optical nanofilter that enhances the formation and yield of algae photopigments, namely chlorophyll, by altering the wavelengths of light absorbed by the algae.
An international team of researchers has used pioneering electron microscopy techniques to discover an important mechanism behind the reaction of metallic nanoparticles with the environment. Crucially, the research led by the Univ. of York, shows that oxidation of metals proceeds much more rapidly in nanoparticles than at the macroscopic scale.
In a breakthrough described by one international expert as “a wonderful piece of lateral thinking”, a team of researchers from The Univ. of Western Australia has helped develop a novel nanoparticle light filter system which stimulates the growth of useful microalgal organisms.
Nanomaterials are the heart of the smaller, better electronics developed during the last decade, as well as new materials, medical diagnostics, energy storage and clean water. However, exposure to nanomaterials may have unintended consequences for human health and the environment. As a resource, Virginia Tech has joined the Woodrow Wilson International Center for Scholars to renew and expand the Nanotechnology Consumer Product Inventory.
Structures that put a spin on light reveal tiny amounts of DNA with 50 times better sensitivity than the best current methods, a collaboration between the Univ. of Michigan and Jiangnan Univ. in China has shown. Highly sensitive detection of DNA can help with diagnosing patients, solving crimes and identifying the origins of biological contaminants such as a pathogen in a water supply.
Quantum dots are nano-sized semiconductor particles whose emission color can be tuned by simply changing their dimensions. New research at Los Alamos National Laboratory aims to improve quantum dot-based light-emitting diodes by using a new generation of engineered quantum dots tailored specifically to have reduced wasteful charge-carrier interactions that compete with the production of light.
By tuning gold nanoparticles to just the right size, researchers from Brown Univ. have developed a catalyst that selectively converts carbon dioxide to carbon monoxide, an active carbon molecule that can be used to make alternative fuels and commodity chemicals.
An aggressive form of breast cancer known as “triple negative” is very difficult to treat: Chemotherapy can shrink such tumors for a while, but in many patients they grow back and gain resistance to the original drugs. To overcome that resistance, chemical engineers have designed nanoparticles that carry the cancer drug doxorubicin, as well as short strands of RNA that can shut off one of the genes that cancer cells use to escape the drug.
Scientists at Brookhaven National Laboratory have developed a general approach for combining different types of nanoparticles to produce large-scale composite materials. The technique opens many opportunities for mixing and matching particles with different magnetic, optical or chemical properties to form new, multifunctional materials or materials with enhanced performance for a wide range of potential applications.
The combination of heat, chemotherapeutic drugs and an innovative delivery system based on nanotechnology may significantly improve the treatment of ovarian cancer while reducing side effects from toxic drugs, researchers at Oregon State Univ. report in a new study. The findings, so far done only in a laboratory setting, show that this one-two punch of mild hyperthermia and chemotherapy can kill 95% of ovarian cancer cells.