Nanotechnology Now

Our NanoNews Digest Sponsors





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

Nanotech could rid cattle of ticks, with less collateral damage September 1st, 2015

Scientists 'squeeze' light one particle at a time: A team of scientists have measured a bizarre effect in quantum physics, in which individual particles of light are said to have been 'squeezed' -- an achievement which at least one textbook had written off as hopeless September 1st, 2015

Using ultrathin sheets to discover new class of wrapped shapes: UMass Amherst materials researchers describe a new regime of wrapped shapes August 31st, 2015

New material science research may advance tech tools August 31st, 2015

Imaging

Nanolab Technologies LEAPS Forward with High-Performance Analysis Services to the World: Nanolab Orders Advanced Local Electrode Atom Probe (LEAP®) Microscope from CAMECA Unit of AMETEK Materials Analysis Division August 27th, 2015

50 Years of Scanning Electron Microscopy from ZEISS: ZEISS celebrates the birth of the first commercial scanning electron microscope in 1965 August 26th, 2015

Announcing Oxford Instruments and School of Physics signing a Memorandum of Understanding August 26th, 2015

Kwansei Gakuin University in Hyogo, Japan, uses Raman microscopy to study crystallographic defects in silicon carbide wafers August 25th, 2015

Govt.-Legislation/Regulation/Funding/Policy

An engineered surface unsticks sticky water droplets August 31st, 2015

New material science research may advance tech tools August 31st, 2015

Artificial leaf harnesses sunlight for efficient fuel production August 30th, 2015

Researchers use DNA 'clews' to shuttle CRISPR-Cas9 gene-editing tool into cells August 30th, 2015

Discoveries

Scientists 'squeeze' light one particle at a time: A team of scientists have measured a bizarre effect in quantum physics, in which individual particles of light are said to have been 'squeezed' -- an achievement which at least one textbook had written off as hopeless September 1st, 2015

Using ultrathin sheets to discover new class of wrapped shapes: UMass Amherst materials researchers describe a new regime of wrapped shapes August 31st, 2015

An engineered surface unsticks sticky water droplets August 31st, 2015

New material science research may advance tech tools August 31st, 2015

Announcements

Nanotech could rid cattle of ticks, with less collateral damage September 1st, 2015

Scientists 'squeeze' light one particle at a time: A team of scientists have measured a bizarre effect in quantum physics, in which individual particles of light are said to have been 'squeezed' -- an achievement which at least one textbook had written off as hopeless September 1st, 2015

An engineered surface unsticks sticky water droplets August 31st, 2015

New material science research may advance tech tools August 31st, 2015

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

Nanotech could rid cattle of ticks, with less collateral damage September 1st, 2015

Scientists 'squeeze' light one particle at a time: A team of scientists have measured a bizarre effect in quantum physics, in which individual particles of light are said to have been 'squeezed' -- an achievement which at least one textbook had written off as hopeless September 1st, 2015

An engineered surface unsticks sticky water droplets August 31st, 2015

New material science research may advance tech tools August 31st, 2015

Environment

Successful boron-doping of graphene nanoribbon August 27th, 2015

Iranian Scientists Utilize Nanomembranes to Purify Wastewater of Olive Oil Plants August 20th, 2015

'Diamonds from the sky' approach turns CO2 into valuable products August 19th, 2015

Sonocatalysts Able to Purify Organic Pollutants of Wastewater August 19th, 2015

Safety-Nanoparticles/Risk management

Warning to DIY enthusiasts & construction workers as dangerous dust emissions August 19th, 2015

Bionic liver micro-organs explain off-target toxicity of acetaminophen (Tylenol): Israeli-German partnership aims to replace animal experiments with advanced liver-on-chip devices August 17th, 2015

Sediment dwelling creatures at risk from nanoparticles in common household products August 13th, 2015

Proving nanoparticles in sunscreen products August 4th, 2015

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

Seeing quantum motion August 30th, 2015

Artificial leaf harnesses sunlight for efficient fuel production August 30th, 2015

50 Years of Scanning Electron Microscopy from ZEISS: ZEISS celebrates the birth of the first commercial scanning electron microscope in 1965 August 26th, 2015

How UEA research could help build computers from DNA August 19th, 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







Car Brands
Buy website traffic