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AssigneeVysoka Skola Bánska - Technical University of Ostrava, Centrum Nantechnologil
InventorRichard Dvorský
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The invention relates to a method of preparation of lamellar porous microstructures and nanostructures of various density based on controlled vacuum freeze-drying of a liquid dispersion of nanoparticles. The liquid dispersion of particles is rapidly freezed into solid state inside a tightly closed volume. In this form it is submitted to vacuum freeze-drying with required rate of sublimation of molecules of a liquid dispersion medium, until their total removal, accompanied by the creation of lamellar microstructures and nanostructures. The orientation of the normal vector of the dominant surface of sublimation interface can be set with regard to the required properties of the final sublimate structure from vertically upwards to vertically downwards. The sublimation rate is adjusted by combination of vacuum depth and external heating of the sublimation interface of the frozen material.
The method of preparation of nanostructural materials by means of controlled freeze-drying of a liquid dispersion of nanoparticles or submicron particles, characterized by that the liquid dispersion of nanoparticles or submicron particles is frozen and in this form it is submitted to freeze-drying where the molecules of the dispersion medium are removed at requested rate of sublimation, until their entire disposal by sublimation, while the orientation of the normal vector of the predominant surface of sublimation interface is adjusted as required at arbitrary angle to the vertical line, and the rate of sublimation of frozen material is controlled by the combination of vacuum depth and external heating of sublimation surface of the frozen material.
The method of preparation of nanostructural materials by means of controlled freeze-drying of a liquid dispersion of nanoparticles or submicron particles according to any of preceding claims, where the dispersion medium of the liquid dispersion is water.
The method of preparation of nanostructural materials by means of controlled freeze-drying of a liquid dispersion of nanoparticles or submicron particles according to any of preceding claims, where the dispersion medium of the liquid dispersion is a liquid with freezing point above −130° C.
The method of preparation of nanostructural materials by means of controlled freeze-drying of a liquid dispersion of nanoparticles or submicron particles according to any of preceding claims, characterized by that during preparation of dense microporous materials the total volume of nanoparticles or submicron particles in the dispersion is greater than or comparable to the total volume of dispersion medium liquid.
Dependencies are inferred from the claim text.