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

Stanford breakthrough heralds super-efficient light-based computers: Light can transmit more data while consuming far less power than electricity, and an engineering feat brings optical data transport closer to replacing wires May 29th, 2015

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

Global Carbon Nanotubes (CNT) Market Expected To Reach USD 3.42 Billion By 2022 May 29th, 2015

Imaging

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

Nano-capsules designed for diagnosing malignant tumours: Japanese researchers have developed adaptable nano-capsules that can help in the diagnosis of glioblastoma cells - a highly invasive form of brain tumours May 28th, 2015

Govt.-Legislation/Regulation/Funding/Policy

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Physicists precisely measure interaction between atoms and carbon surfaces May 28th, 2015

Linking superconductivity and structure May 28th, 2015

Chemists discover key reaction mechanism behind the highly touted sodium-oxygen battery May 28th, 2015

Discoveries

Stanford breakthrough heralds super-efficient light-based computers: Light can transmit more data while consuming far less power than electricity, and an engineering feat brings optical data transport closer to replacing wires May 29th, 2015

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

New technique speeds nanoMRI imaging: Multiplexing technique for nanoscale magnetic resonance imaging developed by researchers in Switzerland cuts normal scan time from two weeks to two days May 28th, 2015

Announcements

Stanford breakthrough heralds super-efficient light-based computers: Light can transmit more data while consuming far less power than electricity, and an engineering feat brings optical data transport closer to replacing wires May 29th, 2015

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

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

Stanford breakthrough heralds super-efficient light-based computers: Light can transmit more data while consuming far less power than electricity, and an engineering feat brings optical data transport closer to replacing wires May 29th, 2015

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Global Carbon Nanotubes (CNT) Market Expected To Reach USD 3.42 Billion By 2022 May 29th, 2015

Environment

Collaboration could lead to biodegradable computer chips May 28th, 2015

Conversion of Greenhouse Gases to Syngas in Presence of Nanocatalysts in Iran May 22nd, 2015

Directa Plus in Barcelona to present the innovative project GEnIuS for oil spills clean-up activities: The company has created a graphene-based product for the remediation of water contaminated by oil and hydrocarbons May 21st, 2015

Nano-policing pollution May 13th, 2015

Safety-Nanoparticles/Risk management

Statement by QD Vision regarding European Parliament’s Vote on Cadmium-Based Quantum Dots May 20th, 2015

SUNY Poly CNSE and NIOSH Launch Federal Nano Health and Safety Consortium: May 20th, 2015

Cotton fibres instead of carbon nanotubes May 9th, 2015

Nanoparticles in consumer products can significantly alter normal gut microbiome May 4th, 2015

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

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

One step closer to a single-molecule device: Columbia Engineering researchers first to create a single-molecule diode -- the ultimate in miniaturization for electronic devices -- with potential for real-world applications May 25th, 2015

What makes cancer cells spread? New device offers clues May 19th, 2015

Researchers build new fermion microscope: Instrument freezes and images 1,000 individual fermionic atoms at once May 13th, 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