A process for the preparation of a film of the oxide or hydroxide of an element of the groups ii or iii of the periodic system, as well as the composite structures with such a film

摘要

A device for microbiologically controlling a dust-laden pressurised gas, including dust collecting means (7, 8) in an inner cavity (3) provided with a gas inlet (6) and a gas outlet (13) and having an internal pressure that is equal to the pressure of said dust-laden gas at least during the operation of said device.