Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > York researchers discover important mechanism behind nanoparticle reactivity

Abstract:
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.

York researchers discover important mechanism behind nanoparticle reactivity

Heslington, UK | Posted on November 3rd, 2013

Crucially, the research led by the University of York and reported in *Nature
Materials*, shows that oxidation of metals - the process that describes,
for example, how iron reacts with oxygen, in the presence of water, to form
rust - proceeds much more rapidly in nanoparticles than at the macroscopic
scale. This is due to the large amount of strain introduced in the
nanoparticles due to their size which is over a thousand times smaller than
the width of a human hair.

Improving the understanding of metallic nanoparticles - particularly those
of iron and silver - is of key importance to scientists because of their
many potential applications. For example, iron and iron oxide nanoparticles
are considered important in fields ranging from clean fuel technologies,
high density data storage and catalysis, to water treatment, soil
remediation, targeted drug delivery and cancer therapy.

The research team, which also included scientists from the University of
Leicester, the National Institute for Materials Science, Japan and the
University of Illinois at Urbana-Champaign, USA, used the unprecedented
resolution attainable with aberration-corrected scanning transmission
electron microscopy to study the oxidisation of cuboid iron nanoparticles
and performed strain analysis at the atomic level.

Lead investigator Dr Roland Kröger, from the University of York's
Department of Physics, said: "Using an approach developed at York and
Leicester for producing and analysing very well-defined nanoparticles, we
were able to study the reaction of metallic nanoparticles with the
environment at the atomic level and to obtain information on strain
associated with the oxide shell on an iron core.

"We found that the oxide film grows much faster on a nanoparticle than on a
bulk single crystal of iron - in fact many orders of magnitude quicker.
Analysis showed there was an astonishing amount of strain and bending in
nanoparticles which would lead to defects in bulk material."

The scientists used a method known as Z-contrast imaging to examine the
oxide layer that forms around a nanoparticle after exposure to the
atmosphere, and found that within two years the particles were completely
oxidised.

Corresponding author Dr Andrew Pratt, from York's Department of Physics and
Japan's National Institute for Materials Science, said: "Oxidation can
drastically alter a nanomaterial's properties - for better or worse - and
so understanding this process at the nanoscale is of critical importance.
This work will therefore help those seeking to use metallic nanoparticles
in environmental and technological applications as it provides a deeper
insight into the changes that may occur over their desired functional
lifetime."

The experimental work was carried out at the York JEOL Nanocentre and the
Department of Physics at the University of York, the Department of Physics
and Astronomy at the University of Leicester and the Frederick-Seitz
Institute for Materials Research at the University of Illinois at
Urbana-Champaign.

The scientists obtained images over a period of two years. After this time,
the iron nanoparticles, which were originally cube-shaped, had become
almost spherical and were completely oxidised.

Professor Chris Binns, from the University of Leicester, said: "For many
years at Leicester we have been developing synthesis techniques to produce
very well-defined nanoparticles and it is great to combine this technology
with the excellent facilities and expertise at York to do such penetrating
science. This work is just the beginning and we intend to capitalise on our
complementary abilities to initiate a wider collaborative programme."

The research was supported by a Max-Kade Foundation Visiting Professorship
stipend to Dr Kröger and financial support from the World Universities
Network (WUN). The Engineering and Physical Sciences Research Council
(EPSRC) funded the initial stages of the project (EP/D034604/1).

####

About University of York
The University of York was founded in 1963 with 200 students. Since then, it has expanded to 10,000 students and has over 30 academic departments and research centres.

Academic excellence

From its inception, the University has concentrated on strong viable departments and teaching and research of the highest quality. The quality of York's teaching has received many accolades. York and Cambridge top the teaching league with the highest scores in official teaching assessments.

For more information, please click here

Contacts:
David Garner
00 44 (1) 904 322153

Copyright © AlphaGalileo

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

The paper “Enhanced Oxidation of Nanoparticles through Strain-Mediated Ionic Transport” by Andrew Pratt, Leonardo Lari, Ondrej Hovorka, Amish

More information on the University of York’s Department of Physics is

More information on the World Universities Network (WUN) at:

More information on the Engineering and Physical Sciences Research

Related News Press

News and information

Production of Zirconium Carbide Nanoparticles at Low Temperature without Thermal Operations July 5th, 2015

A 'movie' of ultrafast rotating molecules at a hundred billion per second: A quantum wave-like nature was successfully observed in rotating nitrogen molecules July 4th, 2015

New Biosensor Produced in Iran to Detect Effective Drugs in Cancer Treatment July 4th, 2015

Pioneering Southampton scientist awarded prestigious physics medal July 3rd, 2015

Imaging

A 'movie' of ultrafast rotating molecules at a hundred billion per second: A quantum wave-like nature was successfully observed in rotating nitrogen molecules July 4th, 2015

Clues to inner atomic life from subtle light-emission shifts: Hyperfine structure of light absorption by short-lived cadmium atom isotopes reveals characteristics of the nucleus that matter for high precision detection methods July 3rd, 2015

Govt.-Legislation/Regulation/Funding/Policy

New technology using silver may hold key to electronics advances July 2nd, 2015

NIST Group Maps Distribution of Carbon Nanotubes in Composite Materials July 2nd, 2015

NIST ‘How-To’ Website Documents Procedures for Nano-EHS Research and Testing July 1st, 2015

Ultra-stable JILA microscopy technique tracks tiny objects for hours July 1st, 2015

Discoveries

Production of Zirconium Carbide Nanoparticles at Low Temperature without Thermal Operations July 5th, 2015

A 'movie' of ultrafast rotating molecules at a hundred billion per second: A quantum wave-like nature was successfully observed in rotating nitrogen molecules July 4th, 2015

New Biosensor Produced in Iran to Detect Effective Drugs in Cancer Treatment July 4th, 2015

Clues to inner atomic life from subtle light-emission shifts: Hyperfine structure of light absorption by short-lived cadmium atom isotopes reveals characteristics of the nucleus that matter for high precision detection methods July 3rd, 2015

Announcements

Production of Zirconium Carbide Nanoparticles at Low Temperature without Thermal Operations July 5th, 2015

A 'movie' of ultrafast rotating molecules at a hundred billion per second: A quantum wave-like nature was successfully observed in rotating nitrogen molecules July 4th, 2015

New Biosensor Produced in Iran to Detect Effective Drugs in Cancer Treatment July 4th, 2015

Pioneering Southampton scientist awarded prestigious physics medal July 3rd, 2015

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Production of Zirconium Carbide Nanoparticles at Low Temperature without Thermal Operations July 5th, 2015

A 'movie' of ultrafast rotating molecules at a hundred billion per second: A quantum wave-like nature was successfully observed in rotating nitrogen molecules July 4th, 2015

New Biosensor Produced in Iran to Detect Effective Drugs in Cancer Treatment July 4th, 2015

Pioneering Southampton scientist awarded prestigious physics medal July 3rd, 2015

Environment

NIST ‘How-To’ Website Documents Procedures for Nano-EHS Research and Testing July 1st, 2015

Carnegie Mellon chemists characterize 3-D macroporous hydrogels: Methods will allow researchers to develop new 'smart' materials June 30th, 2015

The peaks and valleys of silicon: Team of USC Viterbi School of Engineering Researchers introduce new layered semiconducting materials as silicon alternative June 27th, 2015

NNI Publishes Workshop Report and Launches Web Portal on Nanosensors: Both outputs support the Nanotechnology Signature Initiative ‘Nanotechnology for Sensors and Sensors for Nanotechnology: Improving and Protecting Health, Safety, and the Environment’ June 24th, 2015

Safety-Nanoparticles/Risk management

NIST ‘How-To’ Website Documents Procedures for Nano-EHS Research and Testing July 1st, 2015

Proposed TSCA Nanomaterial Rule ‘Premature’, Says Former EPA Toxicologist July 1st, 2015

NNI Publishes Workshop Report and Launches Web Portal on Nanosensors: Both outputs support the Nanotechnology Signature Initiative ‘Nanotechnology for Sensors and Sensors for Nanotechnology: Improving and Protecting Health, Safety, and the Environment’ June 24th, 2015

Environmental Issues to Hamper Growth of Global Nanocomposites Market June 4th, 2015

Grants/Awards/Scholarships/Gifts/Contests/Honors/Records

Pioneering Southampton scientist awarded prestigious physics medal July 3rd, 2015

Discovery of nanotubes offers new clues about cell-to-cell communication July 2nd, 2015

World’s 1st Full-Color, Flexible, Skin-Like Display Developed at UCF June 24th, 2015

Physicists fine-tune control of agile exotic materials: Tunable hybrid polaritons realized with graphene layer on hexagonal boron nitride June 24th, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project