Nanometric-sized ceramic materials, process for their synthesis and uses thereof
AssigneeInnovnano - Materiais Avancados, S.A.
InventorsJoão Manuel Calado Da Silva, Elsa Marisa Dos Santos Antunes
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AssigneeInnovnano - Materiais Avancados, S.A.
InventorsJoão Manuel Calado Da Silva, Elsa Marisa Dos Santos Antunes
Estimating the term…
The disclosed subject concerns nanometric-sized ceramic materials in the form of multiple crystalline structures, composites, or solid solutions, the process for their synthesis, and uses thereof. These materials are mainly obtained by detonation of two water-in-oil (W/O) emulsions, one of which is prepared with precursors in order to present a detonation regime with temperature lower than 2000° C., and they present a high chemical and crystalline phase homogeneity, individually for each particle, as well as a set of complementary properties adjustable according to the final applications, such as a homogeneous distribution of the primary particles, very high chemical purity level, crystallite size below 50 nm, surface areas by mass unit between 25 and 500 m2/g, and true particle densities higher than 98% of the theoretical density. This set of characteristics makes this materials particularly suitable for a vast range of applications in the nanotechnology field, such as, for example, nanocoatings, magnetic nanofluids, nanocatalysts, nanosensors, nanopigments, nanoadditives, ultra light nanocomposites, drug release nanoparticles, nanomarkers, nanometric films, etc.
Process for the synthesis of nanometric-sized ceramic materials, wherein the process is carried out by detonating two water-in-oil (W/O) emulsions, a first one and a second that contains a set of precursors of ceramic materials and presents a detonation regime at temperatures in the point C,J (Chapman, Jouguet) lower than the ceramic nanomaterial melting point, determined from the composition and density of the emulsion by means of the state equation and numerical methods.
Second water-in-oil (W/O) emulsion, further comprising as precursors oxidizing agents soluble in the internal aqueous phase, fuels soluble in the internal aqueous phase, fuels miscible with the external phase, and still solid precursors, such as metals and metal alloys, its internal phase has a pH lower than 3, the density is comprised between 0.7 and 1.7 g/cm3, and it presents a detonation regime with a reaction rate higher than 4000 m/s for a detonation temperature lower than the ceramic nanomaterial melting point.
Dependencies are inferred from the claim text.