Nanoparticles
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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 24 | News
The scientific and technological literature is abuzz with nanotechnology
and its manufacturing and medical applications. But it is in an area
with a
less glitzy aura—plant sciences—where nanotechnology advancements are
contributing dramatically to agriculture. Researchers at Iowa
State University
have now demonstrated the ability to deliver proteins and DNA into plant
cells,
simultaneously.
May 21 | News
A
year-long evaluation of the effect of quantum dots in primates has
found the nanoparticles to be safe, encouraging doctors and scientists
who are hoping to use them to battle diseases like cancer. Cadmium
selenide quantum dots were the variety used in the study.
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 4 | News
A team of scientists has been working to develop nanocrystallography techniques that can be used in ordinary science settings. They have shown how a powerful method called atomic pair distribution function (PDF) analysis can be carried out using a transmission electron microscope.
May 3 | News
Using a refined technique for trapping and manipulating nanoparticles, researchers at NIST have extended the trapped particles' useful life more than tenfold. This new approach, which one researcher likens to "attracting moths," promises to give experimenters the trapping time they need to build nanoscale structures and may open the way to working with nanoparticles inside biological cells without damaging the cells with intense laser light.
Apr 30 | News
Engineers
at Stanford University have found a novel method for “decorating”
nanowires with chains of tiny particles to increase their electrical and
catalytic performance. The new technique is simpler, faster and
provides greater control than earlier methods and could lead to better
batteries, solar cells and catalysts.
Apr 30 | News
Engineers
are developing new and innovative ways of coating medical materials
with nano-sized particles of silver, an element that has long been known
for its antimicrobial properties. However, a recent paper from the
University of Notre Dame highlights the fact that a vast majority of
bacteria are actually neutral, or even beneficial. Overuse of nanosilver
might harm their useful functions in daily life, the paper reports.
Apr 22 | News
The
U.S. government has issued its initial draft guidelines on the use of
nanotechnology, particularly nanoparticles, in food and cosmetic
products. These recommendations, intended to help guarantee consumer
safety within these two industries, do not extend to the other products
that fall under Food and Drug Administration oversights, such as drugs
and medical devices.
Apr 19 | News
Researchers
at the National Institute of Standards and Technology and the
University of Massachusetts Amherst have provided the first evidence
that engineered nanoparticles are able to accumulate within plants and
damage their DNA. They have shown that nanoparticles of cupric oxide, a
common compound, can enter plant root cells and generate mutagenic DNA
base lesions.
