NOVELTY - Membrane comprises particles embedded in a continuous matrix, where at least 50% of the embedded particles at both and opposite surfaces of the membrane, are uncovered by the matrix.    USE - The membrane is useful for: enriching and depleting gases from gas mixture; separating oxygen and nitrogen; separating or enriching of carbon dioxide; separating propane, propene, butane, butene, other higher hydrocarbons from natural gas or aliphatic and aromatic hydrocarbons (all claimed).    ADVANTAGE - The membrane exhibits high mechanical stability, selectivity and improved permeability.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the preparation of the membrane, comprising: either (a) applying particles and a hardenable liquid A, preferably a non-volatile (meth)acrylate, on the surface of the second liquid B, on such a way that the liquid A forms a layer on the liquid B, and have the particles contact to the interfacial area between the liquids, and to the interfacial area between the liquid A and area, in which the liquid is present, where: the particles are from at least a component of a material mixture, preferably a mixture of: oxygen and nitrogen, different gases, aliphatic and aromatic hydrocarbons, molecules with different molecular mass, protic and non-protic compounds, or ionic and non-ionic compounds with high permeability, and the liquid B is non-miscible with the liquid A; (b) hardening the liquid A by evaporating volatile components, crystallization, glazing, polymerization, preferably photo-polymerization process; and (c) subsequently separating the hardened layer with the embedded particles of the liquid B; or (a1) applying the particles on a solid surface, (b1) applying the liquid B on such a way that a part of the remaining area between the solid surface and the particles is filled, (c1) applying the hardenable liquid, on such a way that it forms a layer, which surrounds the particle, but not in the area filled by the liquid B between the particles and the solid surface, carrying out the step (b) and (e1) separating the hardenable layer with embedded particles from the solid surface; or (a2) applying the particles on the solid surface, (b2) impressing the particles into the surface by pressing in a disk press, rolling, heating over the softening point of the solid surface or temporary operating the surface softening substance, (c2) applying the hardenable liquid A, on such a way that the liquid A embeds the particle, not between the particle and the solid surface, carrying out the steps (b) and (e1); or carrying out the step (a1) and (a3) applying the hardenable liquid A on such a way that the liquid is embedded and penetrated between the particles, carrying out the step (e1) and removing the double-sided hardenable liquid and optionally parts of the particle until the membrane is emerged, where at least 80%, preferably 95% of embedded particles at both and opposite surfaces of the membrane, are uncovered by the matrix.