Results 181 to 190 of about 19,975 (231)

Ignition and Passivation of Nanopowders and Compact Samples Made of Nanopowders

2020
It is experimentally shown that at the temperature lower than 0 °C, Ni nanoparticles do not ignite in dry air; however, passivation occurs and provides the further stability of nanoparticles at room temperature. It is shown that the samples of Ni nanoparticles passivated in dry air contain only nickel. By means of the scanning electronic microscopy and
Nikolai M. Rubtsov, Boris S. Seplyarskii, Michail I. Alymov   +2 more
openaire   +1 more source

Photoactive Porous Silicon Nanopowder

ACS Applied Materials & Interfaces, 2013
Bulk processing of porous silicon nanoparticles (nSi) of 50-300 nm size and surface area of 25-230 m(2)/g has been developed using a combustion synthesis method. nSi exhibits consistent photoresponse to AM 1.5 simulated solar excitation. In confirmation of photoactivity, the films of nSi exhibit prompt bleaching following femtosecond laser pulse ...
Benjamin H, Meekins, Ya-Cheng, Lin, Joseph S, Manser, Khachatur, Manukyan, Alexander S, Mukasyan, Prashant V, Kamat, Paul J, McGinn   +6 more
openaire   +2 more sources

Ignition and explosion risks of nanopowders

Journal of Hazardous Materials, 2010
Characterization methods with regard to nanopowder flammability and explosivity are presented and illustrated for few nanopowders. Analytical models are developed in order to explain the dependency of the combustion times on the particle diameter.
Bouillard, J., Vignes, A., Dufaud, O., Perrin, L., Thomas, D.   +4 more
openaire   +4 more sources

Redispersity/Solubility of Nanopowder in Solvents

Recent Patents on Nanotechnology, 2014
Because of the high surface energy, nanoparticles show strong tendency to agglomeration or aggregation during preparations and applications, which thus greatly deteriorate their performance. Investigations have proven that redispersible nanoparticles can exhibit enhanced performances or be used in new technical applications as compared with the non ...
Yunan, Zhao, Minmin, Wang, Yan, Liu, Hongtao, Cui   +3 more
openaire   +2 more sources

Production of Metal Nanopowders by Sonoelectrochemistry

MRS Proceedings, 1994
AbstractMetal powders with a diameter ranging from 20 to 50 micrometers are currently produced by electrolysis at high current density in aqueous electrolytes. A lot of research is then devoted to produce by electrolysis and with a high yield, ultrafine metal powders.
Delplancke, Jean-Luc, Di Bella, V., Reisse, Jacques, Winand, René   +3 more
openaire   +2 more sources

In Vitro Evaluation of Zirconia Nanopowders

Key Engineering Materials, 2003
ZrO2 is used for a long time as biomaterial. Nanopowders of ZrO2 are prepared via a microwave assisted hydrothermal synthesis and morphological studies carried out by TEM. The powders are tested in vitro and this test does not alter the dimension of the particles.
S. Braccini, LEONELLI, Cristina, LUSVARDI, Gigliola, MALAVASI, Gianluca, MENABUE, Ledi   +4 more
openaire   +2 more sources

Oxidation and Melting of Aluminum Nanopowders

The Journal of Physical Chemistry B, 2006
Recently, nanometer-sized aluminum powders became available commercially, and their use as potential additives to propellants, explosives, and pyrotechnics has attracted significant interest. It has been suggested that very low melting temperatures are expected for nanosized aluminum powders and that such low melting temperatures could accelerate ...
Mikhaylo A, Trunov, Swati M, Umbrajkar, Mirko, Schoenitz, Joseph T, Mang, Edward L, Dreizin   +4 more
openaire   +2 more sources

Fire and Explosion of Nanopowders

2015
This chapter explores the explosion characteristics of nanopowders. Combustible nanopowders have a high likelihood of explosion because of their high specific surface and low threshold limits of ignition energy conditions (high sensitivity) compared to their microscaled counterparts. It is shown that the explosion severity of combustible nanopowders is
openaire   +3 more sources

Spectroscopy of Eu:YAG nanopowders

physica status solidi c, 2007
AbstractYAG:Eu nanopowders were synthesized by a nitrate‐citrate sol‐gel method. The morphologic modifications produced by thermal treatments at various temperatures were monitored by a series of parameters obtained from the optical fluorescence spectroscopy: intensity ratio of the transitions 5D0 → 7F2 and 5D0 → 7F1, the maximum splitting of the 7F1 ...
S. Georgescu, A. M. Chinie, A. Stefan, O. Toma   +3 more
openaire   +1 more source

Glass and bioglass nanopowders by flame synthesis

Chemical Communications, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Brunner, Tobias J., Grass, Robert N., Stark, Wendelin J.   +2 more
openaire   +3 more sources