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term: mean grain (particle) size

Determination:

a property of compact nanomaterials and nanopowders which determines the specificity of their properties and applications.

Description:

The average size of grains or particles in nanomaterials and nanopowders is usually determined by the method of electron microscopy and X-ray diffraction. Electron microscopy is the only method that provides for the direct measurement ...

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hydrothermal synthesis

Determination:

a method to produce different chemical compounds and materials using closed-system physical and chemical processes flowing in aqueous solutions at temperatures above 100°C and pressures above 1 atm.

Description:

The method is based on the ability of water and aqueous solutions to dilute at high temperature (500°C) and pressure (10-80 MPa, sometimes up to 300 MPa) substances practically insoluble under normal conditions: some oxides, silicates, sulphides. The main parameters of hydrothermal synthesis, which ...