Effect of High Pressure on Properties of Nanomaterials
11 May 2008Researchers at Lawrence Livermore National Laboratory have recently studied the effect of high pressure on fundamental properties of nanomaterials and especially nanoparticle assemblies, as these are important for various device applications. The team members include Christian Grant, Andrew Williamson, Natalia Zaitseva, Jonathan Crowhurst and Sebastien Hamel.
Researchers applied a very high static pressure of the order of 70,000 atmospheres on quantum dot solids such as cadmium selenide nanocrystals or assemblies of cadmium. Researchers used laser-based luminescence technique to study the response of quantum dots.
The results were later carefully studied and it was observed that whenever a uniform pressure was applied on quantum dots, the experimental and theoretical results were comparable. However in case of non-uniform pressure, there was significant difference in theoretical and experimental results.
The team measured energy for several different pressure mediums and whenever uniform pressure is applied on quantum dot solids, researchers observed that there is a steady increase in energy as a function of pressure and for non-uniform pressure case, after initial increase in energy, a flat or even decrease in energy was observed.
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