Nanotechnology
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May 24 | News
The
contention of a major but controversial new theory to explain
nanocrystal growth is that nanoparticles can act as “artificial atoms,”
forming molecular-type building blocks that can assemble into complex
structures. The conclusion is based on recent observations of growing
nanorods made by Lawrence Berkeley National Laoratory researchers using
transmission electron microscopy and advanced liquid cell handling
techniques.
May 11 | News
A
French-American collaboration has developed a new combination of
polymers that makes it possible to design ultra-thin films capable of
self-organization with a 5-nm resolution. These hybrid copolymers are
based on sugars and oil-based macromolecules. Previous attempts using
nothing but oil-based molecules were limited to 20 nm in thickness.
May 10 | News
After
studies involving advanced simulations of nanoscale magnetic and
materials phenomena, a team of scientists in Germany have proposed
making use of magnetic moments in chains of iron atoms to allow
information to be transported on the nanoscale in a fast and
energy-efficient manner. The scheme, demonstrated in experiments, would
work over a wide temperature range, remaining largely unaffected by
external magnetic fields.
May 9 | News
Gallium
nitride, a semiconductor material found in bright lights since the
1990s, is used in wireless applications because of its high efficiency
and high voltage operation. However, it’s difficult to remove heat from
GaN electronics, which limits applications and markets. Researchers at
the University of California, Riverside, have made a material from
graphene that does the job, and it looks a lot like a patterned quilt.
May 9 | News
White-light
quantum dots made from cadmium selenide can convert blue light produced
by a light-emitting diode into a warm white light similar to that
generated by an incandescent bulb. But their performance has been poor
until recent development breakthroughs have improved efficiency from
just 3% originally to as high as 45%.
May 7 | News
The
performance of magnetic storage devices is limited by the way magnetic
domains interact when in close proximity. Researchers in the U.K. have
demonstrated that a honeycomb pattern of nano-sized magnets in a
material known as spin ice introduces competition between neighboring
magnets, and reduces the problems caused by these interactions by
two-thirds.
May 3 | News
By
using diamond-tipped tools to apply pressure, a team led by Johns
Hopkins engineers has discovered some previously unknown electrical
properties of a common memory material, a mix of germanium, antimony,
and tellurium called GST. The discovery should make GST more useful for
electronics developers by allowing memory formats that retain data more
quickly, last longer, and allow far more capacity.
May 2 | News
Scientists
from Imperial College London have collaborated with colleagues at King
Abdullah University of Science and Technology in Saudi Arabia to produce
organic thin-film transistors that consistently achieve record-breaking
carrier mobility through careful solution-processing of a blend of two
organic semiconductors.
Apr 27 | News
In
collaboration with researchers in Japan, U.K. scientists have grown
highly boron-doped diamond layers just 1 nm in thickness. The technique
is known as d-doping, and the researchers believe the layers will be the
basis for high-performance field-effect transistors that offer the
prospect of highly sensitive biochemical agent detection.
Apr 23 | News
Using
a self-assembly method that combines synthetic molecules typically used
in photocopying, researchers in France and Germany have made highly
conductive plastic fibers that are only several nanometers thick.
