Navigation Links
High pressure gold nanocrystal structure revealed
Date:4/10/2013

A major breakthrough in measuring the structure of nanomaterials under extremely high pressure has been made by researchers at the London Centre for Nanotechnology (LCN).

Described in Nature Communications, the study used new advances in x-ray diffraction to image the changes in morphology of gold nanocrystals under pressures of up to 6.5 gigapascals.

Under high pressures, imaging methods such as electron or atomic force microscopy are not viable, making x-ray diffraction imaging the only option. However, until recently, focusing an image created with this method has proved difficult.

Using a technique developed by LCN researchers to correct the distortions of the x-ray beams, the scientists, working in collaboration with the Carnegie Institution of Washington, have now been able to measure the structure of gold nanocrystals in higher resolution than ever before.

Professor Ian Robinson, who led the LCN's contribution to the study, said: "Solving the distortion problem of the x-ray diffraction images is analogous to prescribing eye glasses to correct vision.

"Now this problem has been solved, we can access the whole field of nanocrystal structures under pressure. The scientific mystery of why nanocrystals under pressure are up to 50% stronger than bulk material may soon be unravelled."

To carry out the research, a 400 nm diameter gold nanocrystal was put into a device called a Diamond-Anvil Cell (DAC) which can recreate the immense pressures which exist deep inside the Earth, creating materials and phases which do not exist under normal conditions.

The sample was crushed within the device and the changes were imaged as the pressure, measured by a small ruby sphere, was increased. The study showed that under low pressure, the nanocrystal acted as expected and the edges became strained, however, surprisingly, the strains disappeared under further compression.

The scientists explain this by suggesting that the pressurised material is undergoing "plastic flow", a phenomenon whereby a material will start to flow and become liquid once it reaches a critical pressure. This hypothesis was further supported when the faceted shape of the crystal developed a smoother and rounder shape as the pressure increased.

Professor Robinson added "This development has great potential for exploring the formation of minerals within the Earth's crust, which transform from one phase to another under pressure"

In the future, this technique offers a very promising approach for in-situ nanotechnology development under high pressures.


'/>"/>

Contact: Clare Ryan
clare.ryan@ucl.ac.uk
44-020-310-83846
University College London
Source:Eurekalert

Related biology technology :

1. Pressure BioSciences, Inc. Reaches Agreement with Investors on Initial $600,000 Tranche of $1.2 Million Above-Market Private Placement; Proceeds to Support Continued Commercialization of PCT Product Platform
2. Pressure BioSciences, Inc. Continues Global Sales Reach Expansion with Distribution Agreements for China, Vietnam, Laos, Cambodia, Australia, and New Zealand
3. Pressure BioSciences, Inc. Appoints Conrad F. Mir as Chief Financial Officer
4. New Applications of Pressure BioSciences PCT Platform Prominently Featured at Scientific Conference on Technologies for Protein Research
5. Further Advancements Made in the Development of an Improved Method For Rape Kit Testing Using Pressure BioSciences Patented Pressure Cycling Technology (PCT)
6. On the road to plasmonics with silver polyhedral nanocrystals
7. Nanocrystals make dentures shine
8. First atomic-scale real-time movies of platinum nanocrystal growth in liquids
9. Nanotechnology for Drug Delivery: Global Market for Nanocrystals
10. Novel technique to synthesize nanocrystals that harvest solar energy
11. Engineers achieve longstanding goal of stable nanocrystalline metals
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/23/2016)... , June 23, 2016 Houston ... with the Cy-Fair Sports Association to serve as ... the agreement, Houston Methodist Willowbrook will provide sponsorship ... and connectivity with association coaches, volunteers, athletes and ... with the Cy-Fair Sports Association and to bring ...
(Date:6/23/2016)... NEW YORK , June, 23, 2016  The ... students to envision new ways to harness living systems ... of Modern Art (MoMA) in New York ... more than 130 participating students, showcased projects at MoMA,s ... included Paola Antonelli , MoMA,s senior curator of ...
(Date:6/23/2016)... ... June 23, 2016 , ... STACS DNA Inc., the sample ... the Arkansas State Crime Laboratory, has joined STACS DNA as a Field Application Specialist. ... said Jocelyn Tremblay, President and COO of STACS DNA. “In further expanding our capacity ...
(Date:6/23/2016)... 2016  Blueprint Bio, a company dedicated to identifying, ... community, has closed its Series A funding round, according ... "We have received a commitment from Forentis Fund ... to meet our current goals," stated Matthew Nunez ... to complete validation on the current projects in our ...
Breaking Biology Technology:
(Date:6/16/2016)... 2016 The global ... reach USD 1.83 billion by 2024, according to ... Technological proliferation and increasing demand in commercial buildings, ... drive the market growth.      (Logo: ... development of advanced multimodal techniques for biometric authentication ...
(Date:6/3/2016)... Das DOTM (Department ... hat ein 44 Millionen $-Projekt ... einschließlich Personalisierung, Registrierung und IT-Infrastruktur, an Decatur ... Implementierung von Identitätsmanagementlösungen. Zahlreiche renommierte internationale Anbieter ... aber Decatur wurde als konformste und innovativste ...
(Date:5/24/2016)... patient care by providing unparalleled technology to leaders of the medical imaging industry.  As ... added to the range of products distributed by Ampronix. Photo - ... ... ... ...
Breaking Biology News(10 mins):