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Imaging transient melting of a nanocrystal using an X-ray laser.
Proc Natl Acad Sci U S A
June 2015
London Centre for Nanotechnology, University College London, London WC1E 6BT, United Kingdom; Research Complex at Harwell, Didcot, Oxfordshire OX11 0DE, United Kingdom;
There is a fundamental interest in studying photoinduced dynamics in nanoparticles and nanostructures as it provides insight into their mechanical and thermal properties out of equilibrium and during phase transitions. Nanoparticles can display significantly different properties from the bulk, which is due to the interplay between their size, morphology, crystallinity, defect concentration, and surface properties. Particularly interesting scenarios arise when nanoparticles undergo phase transitions, such as melting induced by an optical laser.
View Article and Find Full Text PDFSolvent and melting induced microspheres sintering techniques: a comparative study of morphology and mechanical properties.
J Mater Sci Mater Med
September 2011
Interdisciplinary Research Centre on Biomaterials (CRIB), University of Naples Federico II, Naples, Italy,
In this work we propose a bottom up approach founded on the assembly of building blocks by solvent induced microparticle sintering to realize multifunctional polymer scaffolds with predefined pore dimension and fully percolative pathway, able to include interspersing microdepot for the release of bioactive molecules. The aim of this study was to develop a versatile method of microspheres sintering based on the partial dissolution of the surface of adjacent microparticles and to compare it with melting induced microspheres sintering, just developed in a previous work. The two techniques were compared in terms of morphology, porosity and mechanical properties.
View Article and Find Full Text PDFComparative study of Laser induce damage of HfO2/SiO2 and TiO2/SiO2 mirrors at 1064 nm.
Opt Express
February 2011
Institute of Precision Optical Engineering, Department of Physics, Tongji University, Shanghai, China.
A comparative study of laser induced damage of HfO2/SiO2 and TiO2/SiO2 mirrors at 1064 nm has been carried out. One TiO2/SiO2 mirror with absorption of 300 ppm and two HfO2/SiO2 mirrors with absorption of 40 and 4.5 ppm were fabricated using electron beam evaporation method.
View Article and Find Full Text PDFThe fabrication of periodic metal nanodot arrays through pulsed laser melting induced fragmentation of metal nanogratings.
Nanotechnology
July 2009
Nanostructure Laboratory, Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA.
We propose and demonstrate a new method for fabricating periodic arrays of metal nanodots over a large area. In this method, metal nanogratings were first patterned on a substrate by nanoimprint lithography and lift-off, and were then melted using a single excimer laser pulse. We found that the laser melting broke the metal nanogratings into periodic nanodots.
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