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:5/19/2016)... ... May 19, 2016 , ... KCAS Bioanalytical and Biomarker Services, ... Director, Large Molecule & Biomarker Bioanalysis. , Dr. Siddiqui has more than 15 ... for preclinical and clinical safety programs. “We’ve seen significant demand for, and we ...
(Date:5/18/2016)... 2016 The Biotech industry continues to ... that there are no opportunities ahead. Today, ActiveWallSt.com has on ... THLD ), Seattle Genetics Inc. (NASDAQ: SGEN ... Corp. (NASDAQ: OPHT ). Sign up now to ... http://www.activewallst.com/ Threshold Pharmaceuticals Inc.,s shares gained ...
(Date:5/17/2016)... -- Haselmeier announces the launch by Merck ... EMA, the European Medicines Agency. Originally launched in 2011 ... new pen version includes enhancements to further improve the ... patients during use. Its enhanced design has ... with a larger display window that improves the readability ...
(Date:5/17/2016)... BASEL, Switzerland , May 17, 2016 /PRNewswire/ ... sciences company located in Basel, Switzerland ... an investigational oral inhibitor of P38 mitogen-activated protein ... ) , Strekin will build the ... Pamapimod in indications in which MAP Kinases play ...
Breaking Biology Technology:
(Date:5/9/2016)... UAE, May 9, 2016 Elevay ... comes to expanding freedom for high net worth professionals ... in today,s globally connected world, there is still no ... could ever duplicate sealing your deal with a firm ... passports by taking advantage of citizenship via investment programs ...
(Date:4/28/2016)... 28, 2016 First quarter 2016:   ... compared with the first quarter of 2015 The gross ... M (loss: 18.8) and the operating margin was 40% (-13) ... Cash flow from operations was SEK 249.9 M (21.2) , ... is unchanged, SEK 7,000-8,500 M. The operating margin for ...
(Date:4/19/2016)... The new GEZE SecuLogic access ... "all-in-one" system solution for all door components. It can ... door interface with integration authorization management system, and thus ... minimal dimensions of the access control and the optimum ... offer considerable freedom of design with regard to the ...
Breaking Biology News(10 mins):