Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Atom-scale oxidation mechanism of nanoparticles helps develop anti-corrosion materials

This is a schematic illustration of the dynamic size effect in enhancing the oxidation resistance of active FeO NSs.
CREDIT
Image by YANG Fan
This is a schematic illustration of the dynamic size effect in enhancing the oxidation resistance of active FeO NSs. CREDIT Image by YANG Fan

Abstract:
The research group led by Prof. BAO Xinhe from Dalian Institute of Chemical Physics, Chinese Academy of Sciences discovered that oxide nanostructures (NSs) with a diameter below 3 nm could exhibit an oxidation resistance much more superior than larger NSs. By investigating the oxidation mechanism at the atomic level, the team proposed, for the first time, a "dynamic size effect", that determines the stability of supported nanoparticles.

Atom-scale oxidation mechanism of nanoparticles helps develop anti-corrosion materials

Beijing, China | Posted on February 24th, 2017

These findings were published in the latest issue of Nature Communications, entitled "Enhanced oxidation resistance of active nanostructures via dynamic size effect". This study not only brings the atomic understanding of the dynamic remodeling mechanism of nanocatalyst under the atmosphere, but also provides a new interface control for the development of anti-corrosion and anti-oxidation nano-protective coating.

A major challenge limiting the practical applications of nanomaterials is that the activities of NSs increase with reduced size, often sacrificing their stability in the chemical environment. Under oxidative conditions, NSs with smaller sizes and higher defect densities are commonly expected to oxidize more easily, since high-concentration defects can facilitate oxidation by enhancing the reactivity with O2 and providing a fast channel for oxygen incorporation.

Yet, several nanocrystalline materials were also reported previously to exhibit improved oxidation resistance with respect to bulk materials and have been applied as anti-corrosion coatings. The lack of general consensus on the oxidation resistance of oxide NSs has been attributed to the limited understanding on the underlying mechanism of oxidation. Particularly, the oxidation kinetics of NSs with diameters below 5 nm have rarely been studied.

BAO's team and Prof. YANG Fan thus constructed FeO NSs with different sizes on Pt (111) and studied their oxidation kinetics using high resolution scanning tunneling microscopy (STM) and density-functional theory (DFT) calculations. Reducing the size of active FeO NSs was found to increase drastically their oxidation resistance and a maximum oxidation resistance is found for FeO NSs with dimensions below 3.2 nm. The team found the enhanced oxidation resistance originates from the size-dependent structural dynamics of FeO NSs in O2.

Specifically, the study shows that FeO NSs with a size below 3.2 nm could undergo a facile and complete reconstruction, when O2 dissociates at the coordinatively unsaturated ferrous centers at the edges of FeO NSs. Accompanying the reconstruction, the dissociated oxygen atoms are stabilized at the edges of FeO NSs and could not penetrate into the interface FeO and Pt, thereby inhibiting the further oxidation of FeO NSs. FeO NSs with dimensions above 3.2 nm are easier to be oxidized, because of their inability to complete the reconstruction, accompanied by the formation of surface dislocations.

In other words, small FeO NSs are more susceptible to dynamic changes in the reaction, to achieve a relatively stable structure. The authors term this as the "dynamic size effect" and found it to govern the chemical properties of active NSs. To demonstrate the generality of dynamic size effect, the researchers also studied CoO NSs supported on Pt (111) or Au (111), and found similar oxidation-resistant behavior for NSs below 3 nm.

####

For more information, please click here

Contacts:
LU Xinyi

86-411-843-79201

Copyright © Chinese Academy of Sciences

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

RELATED JOURNAL ARTICLE:

Related News Press

News and information

ICN2 researchers compute unprecedented values for spin lifetime anisotropy in graphene November 17th, 2017

Math gets real in strong, lightweight structures: Rice University researchers use 3-D printers to turn century-old theory into complex schwarzites November 16th, 2017

The stacked color sensor: True colors meet minimization November 16th, 2017

Nanometrics to Participate in the 6th Annual NYC Investor Summit 2017 November 16th, 2017

Marine/Watercraft

Promising sensors for submarines, mines and spacecraft: MSU scientists are developing nanostructured gas sensors that would work at room temperature November 10th, 2017

Transparent gel-based robots can catch and release live fish: Made from hydrogel, robots may one day assist in surgical operations, evade underwater detection February 2nd, 2017

NIST-made 'sun and rain' used to study nanoparticle release from polymers October 5th, 2016

New material to revolutionize water proofing September 12th, 2016

Govt.-Legislation/Regulation/Funding/Policy

EC Project Aims at Creating and Commercializing Cyber-Physical-System Solutions November 14th, 2017

Nanobiotix presented new clinical and pre-clinical data confirming NBTXR3’s significant potential role in Immuno-Oncology at SITC Annual Meeting November 14th, 2017

Leti Joins DARPA-Funded Project to Develop Implantable Device for Restoring Vision November 9th, 2017

Nanoshells could deliver more chemo with fewer side effects: In vitro study verifies method for remotely triggering release of cancer drugs November 8th, 2017

Possible Futures

Math gets real in strong, lightweight structures: Rice University researchers use 3-D printers to turn century-old theory into complex schwarzites November 16th, 2017

The stacked color sensor: True colors meet minimization November 16th, 2017

GLOBALFOUNDRIES Demonstrates Industry-Leading 112G Technology for Next-Generation Connectivity Solutions: High bandwidth, low power SerDes IP portfolio enables ‘connected intelligence’ in data centers and networking applications November 15th, 2017

Counterfeits and product piracy can be prevented by security features, such as printed 3-D microstructures: Forgeries and product piracy are detrimental to society and industry -- 3-D microstructures can increase security -- KIT researchers develop innovative fluorescent 3-D stru November 15th, 2017

Discoveries

ICN2 researchers compute unprecedented values for spin lifetime anisotropy in graphene November 17th, 2017

Math gets real in strong, lightweight structures: Rice University researchers use 3-D printers to turn century-old theory into complex schwarzites November 16th, 2017

The stacked color sensor: True colors meet minimization November 16th, 2017

Counterfeits and product piracy can be prevented by security features, such as printed 3-D microstructures: Forgeries and product piracy are detrimental to society and industry -- 3-D microstructures can increase security -- KIT researchers develop innovative fluorescent 3-D stru November 15th, 2017

Materials/Metamaterials

ICN2 researchers compute unprecedented values for spin lifetime anisotropy in graphene November 17th, 2017

Math gets real in strong, lightweight structures: Rice University researchers use 3-D printers to turn century-old theory into complex schwarzites November 16th, 2017

A new way to mix oil and water: Condensation-based method developed at MIT could create stable nanoscale emulsions November 8th, 2017

TUBALL nanotube-based concentrates recognised as the most innovative raw material for composites by JEC Group November 7th, 2017

Announcements

ICN2 researchers compute unprecedented values for spin lifetime anisotropy in graphene November 17th, 2017

Math gets real in strong, lightweight structures: Rice University researchers use 3-D printers to turn century-old theory into complex schwarzites November 16th, 2017

The stacked color sensor: True colors meet minimization November 16th, 2017

Nanometrics to Participate in the 6th Annual NYC Investor Summit 2017 November 16th, 2017

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

ICN2 researchers compute unprecedented values for spin lifetime anisotropy in graphene November 17th, 2017

Math gets real in strong, lightweight structures: Rice University researchers use 3-D printers to turn century-old theory into complex schwarzites November 16th, 2017

The stacked color sensor: True colors meet minimization November 16th, 2017

Counterfeits and product piracy can be prevented by security features, such as printed 3-D microstructures: Forgeries and product piracy are detrimental to society and industry -- 3-D microstructures can increase security -- KIT researchers develop innovative fluorescent 3-D stru November 15th, 2017

Automotive/Transportation

The next generation of power electronics? Gallium nitride doped with beryllium: How to cut down energy loss in power electronics? The right kind of doping November 9th, 2017

Leti Coordinating Project to Develop Innovative Drivetrains for 3rd-generation Electric Vehicles: CEA Tech’s Contribution Includes Liten’s Knowhow in Magnetic Materials and Simulation And Leti’s Expertise in Wide-bandgap Semiconductors October 20th, 2017

GLOBALFOUNDRIES Introduces New Automotive Platform to Fuel Tomorrow’s Connected Car: AutoPro™ provides a full range of technologies and manufacturing services to help carmakers harness the power of silicon for a new era of ‘connected intelligence’ October 12th, 2017

Organic/inorganic sulfur may be key for safe rechargeable lithium batteries October 12th, 2017

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