News from the NNI Community - Research Advances Funded by Agencies Participating in the NNI

A team led by the University of Illinois Urbana-Champaign has demonstrated a more efficient and environmentally friendly method to produce hydrogen peroxide. Currently, producing hydrogen peroxide requires a complicated, multi-step process and large facilities. The researchers found that a catalyst with a ratio of one palladium to 220 gold atoms generates almost 100% hydrogen peroxide. The scientists are now using these results to pursue the development of nanoparticle catalysts with new compositions and reactors to enable hybrid chemical-electrochemical methods for the production of hydrogen peroxide.

Researchers from Iowa State University, ETH Zurich in Switzerland, Paul Scherrer Institut in Switzerland, the Swiss Federal Laboratories for Materials Science and Technology, Graz University of Technology in Austria, and IBM Research Europe have developed new types of materials that combine two or three types of nanoparticles into structures that display fundamental new properties, such as superfluorescence. The researchers combined perovskite nanocubes – tiny crystals with useful electrical or optical properties – with spherical nanoparticles to form a regular, repeating structure called a superlattice. This is the first time such nanoparticles have been combined.

Physicists from across three continents – including MIT and the U.S. Department of Energy’s Brookhaven National Laboratory – have reported the first experimental evidence to explain the unusual electronic behavior behind the world's thinnest superconductor. The scientists used a new experimental technique, called resonant inelastic X-ray scattering, to study high-temperature superconductivity in a monolayer-thin film of iron selenide, providing a new route to investigate the mechanisms enabling high-temperature superconductivity. The resulting data could help guide the development of better superconductors, and, in turn, transform the fields of medical diagnostics, quantum computing, and energy transport, which all use superconductors.

Researchers at Washington State University have developed a new technique that uses chemically sensitive “soft” X-rays and offers a simpler, non-disruptive way of gaining insight into "nanocarriers" for highly targeted drug delivery and environmental clean-up. Currently researchers have to rely on attaching fluorescent dyes or heavy metals to label parts of organic nanocarrier structures for investigation, often changing them in the process. The new X-ray method has been demonstrated on a smart drug delivery nanoparticle and a polysoap nanostructure intended to capture crude oil spilled in the ocean.

Bioengineers at the University of California, Riverside, have developed a membrane made of nanofibers from a polymer commonly used in vascular sutures that can be loaded with therapeutic drugs and implanted in the body. Once this polymer is present in the body, mechanical forces activate its electric potential and slowly release the drugs. The engineers used a technique called electrospinning to produce the nanofibers, which are layered in a thin mat. The novel system could improve treatment of cancer and other chronic diseases.

Scientists at Rice University have discovered that ultrathin, highly aligned carbon nanotube films can make terahertz polarization rotation possible. This discovery means that polarized light from a laser can be manipulated in ways that were previously out of reach, making it completely visible or completely opaque with an extremely thin device. The unique optical rotation happens when linearly polarized pulses of light pass through the 45-nanometer film and hit the silicon surface on which it sits.

Researchers from Cornell University, the Kavli Institute at Cornell for Nanoscale Science, the U.S. Department of Energy’s Argonne National Laboratory, the Paul Scherrer Institut in Switzerland, and the Leibniz Institute for Crystal Growth in Germany have built an electron microscope pixel array detector that sets a new world record by doubling the resolution of state-of-the-art electron microscopes. The detector will enable researchers to locate individual atoms in all three dimensions when they might be otherwise hidden using other imaging methods. This scientific advance could be helpful in imaging semiconductors, catalysts, and quantum materials – including those used in quantum computing.

Researchers at Caltech have created a material that can collect drinkable water from the air both day and night, combining two water-harvesting technologies into one. The material is part of a class of so-called “micro- and nano-architected materials,” whose shapes (controlled at each length scale, nanoscopic and microscopic) give them unusual and potentially useful properties. In this case, the material is a membrane of arrayed tiny spines that look like Christmas trees and are inspired by the shape of cactus spines.

An international, interdisciplinary team of researchers has found a way to replicate a natural process that moves water between cells, with a goal of improving how we filter out salt and other elements and molecules to create clean water while consuming less energy. This is the first instance of an artificial nanometer-sized channel that can truly emulate the key water transport features of these biological water channels. This water-transport channel could improve the ability of membranes to efficiently filter out unwanted molecules and elements, while speeding up water transport, making it cheaper to create a clean supply.

A promising class of therapeutics uses synthetic nucleic acids, called small interfering RNA (siRNA), to target and shut down specific, harmful genes and prevent viruses from spreading. Now, chemical engineering researchers at the University of Texas at Austin have created and analyzed different types of nanoparticles that deliver siRNA to their targets while protecting the siRNAs from the body's immune system.