Nanoparticle Superlattices With DNA-mediated Reprogramming

Dynamic nanomaterials with structures and properties that can be switched on demand have now become one step closer to reality. In a new paper, scientists at Brookhaven National Laboratory detail a method to selectively rearrange nanoparticles in three-dimensional arrays to create different configurations, or phases, from the same nano-components. Study leader Oleg Gang, of Brookhaven’s Center for Functional Nanomaterials (CFN), said: Capability of directing particle rearrangements, or phase changes, would enable scientists to choose the desired properties, for example, the material’s response to light or a magnetic field, and switch them as needed. [Read More]

Silver Nanoparticles Antibacterial Activity Holds Promise

For centuries, precious metals such as gold and silver have been thought to have biomedical properties. But do these materials effectively combat cancer and bacteria? And if so, how do they do it without contaminating the patient and the environment with toxins? Peng Zhang, Associate Professor of Chemistry at Dalhousie Univesity, is searching for the answers: According to Zhang, if you compare silver to current antibiotics, silver does not show drug-resistant behaviour: [Read More]

Gold Nanoparticles That Control Stem Cell Differentiation Developed

Gold nanoparticles that have functional surfaces and act on osteogenic (bone) differentiation of stem cells have been developed by scientists at the International Center for Materials Nanoarchitectonics (MANA). In the field of regenerative medicine, technology for controlling stem cell functions such as differentiation and proliferation is vital. It has been reported that nanosized gold particles promote the differentiation of human mesenchymal stem cells into osteoblasts. Mesenchymal stem cells, or MSCs, are stromal cells which can differentiate into a variety of cell types, including osteoblasts, chondrocytes (cartilage cells), myocytes (muscle cells) and adipocytes. [Read More]

Magnetic Nanoparticle Arrays Combine Plasmonics And Magneto-optics

A new way of combining plasmonic and magneto-optical effects has been discovered by researchers at Finland’s Aalto University. The researchers Showed experimentally that patterning of magnetic materials into arrays of nanoscale dots can lead to a very strong and highly controllable modification of the polarization of light when the beam reflects from the array. The discovery could increase the sensitivity of optical components for telecommunication and biosensing applications. Quantum Mechanical Interactions Coupling of light and magnetization in ferromagnetic materials stems from quantum mechanical interactions. [Read More]

Soft Nanoparticles act as Two Dimensional Liquid

At the interface where water and oil meet, there is a two-dimensional world. This interface presents a potentially useful set of properties for chemists and engineers. Except that getting anything more complex than a soap molecule to stay there and behave predictably remains a challenge. Now, researchers from University of Pennsylvania have shown how to make nanoparticles that are attracted to this interface but not to each other, creating a system that acts as a two-dimensional liquid. [Read More]

3D Printed Microactuators for Liquid Materials Transport

Scientists at ETH Zurich have developed new forms of tiny magnetic actuators with new materials and microscopic 3D printing technology. Research has been ongoing into micrometre-sized actuators, which could eventually make it possible to transport drugs or chemical sensor molecules to specific locations throughout the human body. (Remember the sci-fi movie Fantastic Voyage?) Development of such micro-devices has taken a decisive step forward with a new production technology and new materials that have made it possible to manufacture tiny actuators in any form and optimise them for future applications. [Read More]

Solar Powered Printing makes Solar Cells with Nanoparticle Ink

Chemical engineers at Oregon State University have discovered a way to harness solar energy to produce solar cells as well as to power them. The breakthrough could decrease the cost of solar energy, as well as speed up production processes, while using environmentally friendly materials. “This approach should work and is very environmentally conscious,” said lead author Chih-Hung Chang. Continuous Flow Solar Microreactor The method involves the use of a continuous flow microreactor to make nanoparticle inks that produce solar cells by printing. [Read More]

Bimetallic Nanoparticles grown with Atomic Layer Deposition

Bimetallic nanoparticles are minuscule grains a few dozen to hundreds of atoms in size. But they hold out remarkable promise as vehicles for a number of applications, and researchers had no accurate, flexible general means for creating them until now. Traditional methods, says Elam, a chemist at Argonne National Laboratory, lack the precision to make a batch of purely bimetallic nanoparticles. Rather, they yeild a mixture of both bimetallic and monometallic nanoparticles, and these different nanoparticles have different chemical properties. [Read More]

Graphene Nanoscrolls Form Spontaneously When Maghemite Applied

A new nanomaterial that could have an application as electrodes in for example Li-ion batteries has been demonstrated by researchers at Umeå University, Uppsala University and Stockholm University. Graphene doped with nitrogen can be rolled into perfect nano scrolls by adhering magnetic iron oxide nanoparticles on the surface of the graphene sheets. Ordinary graphene is made of carbon sheets a single or few atomic layers thick. In this study, the researchers modified graphene by substituting some of the carbon atoms with nitrogen atoms. [Read More]

New Electronic Ink Technology Could Mean Cheaper Electronics and Solar Cells

Important technical barriers to inexpensive, durable electronics and solar cells made out of non-toxic chemicals have been overcome by researchers in the University of Minnesota and the National Renewable Energy Laboratory. “What this research means is that we are one step closer to producing more pure and more stable electronic ink with non-toxic chemicals,” said Uwe Kortshagen, co-author of the paper announcing the breakthrough . “The bigger goal here is to find a way that this research can benefit everyone and make a real difference. [Read More]