Browsing by Keyword "synthesis"
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Item Dispersion and surface functionalization of oxide nanoparticles for transparent photocatalytic and UV-protecting coatings and sunscreens(2013-04) Faure, Bertrand; Salazar-Alvarez, German; Ahniyaz, Anwar; Villaluenga, Irune; Berriozabal, Gemma; De Miguel, Yolanda R.; Bergström, Lennart; INGENIERÍA DE SUPERFICIES; MercadoThis review describes recent efforts on the synthesis, dispersion and surface functionalization of the three dominating oxide nanoparticles used for photocatalytic, UV-blocking and sunscreen applications: titania, zinc oxide, and ceria. The gas phase and liquid phase synthesis is described briefly and examples are given of how weakly aggregated photocatalytic or UV-absorbing oxide nanoparticles with different composition, morphology and size can be generated. The principles of deagglomeration are reviewed and the specific challenges for nanoparticles highlighted. The stabilization of oxide nanoparticles in both aqueous and non-aqueous media requires a good understanding of the magnitude of the interparticle forces and the surface chemistry of the materials. Quantitative estimates of the Hamaker constants in various media and measurements of the isoelectric points for the different oxide nanoparticles are presented together with an overview of different additives used to prepare stable dispersions. The structural and chemical requirements and the various routes to produce transparent photocatalytic and nanoparticle-based UV-protecting coatings, and UV-blocking sunscreens are described and discussed.Item Foams(Elsevier, 2017-01-01) Agote, Iñigo; Lagos, Miguel A.; Gutiérrez, Manuel; Sargsyan, Ara; EXTREMAT; SGInorganic porous materials have been widely investigated owing to their outstanding properties, such as large surface area, low density, mechanical stability, and good permeability. Some interesting examples of foams obtained by SHS are presented. Porous NiTi shape-memory alloys (SMA) with ideal pore characteristics and high strength for hard tissue implants have been fabricated by combustion synthesis. MoSi2–Al cermet foams may be obtained under the combustion mode using PTFE as foaming agent.