![]() ![]() The choice of gas to be used is dependent on the expected surface area and the properties of the sample. The specific surface area of a material is then determined by the physical adsorption of a gas (typically nitrogen, krypton, or argon) onto the surface of the sample at cryogenic temperatures (typically liquid nitrogen or liquid argon temperatures). ![]() This process must be carefully controlled and monitored in order to generate the most accurate and repeatable results. This is typically accomplished by applying elevated temperature to the sample in conjunction with vacuum or continuously flowing inert gas. ![]() Prior to analysis, the sample must be preconditioned to remove physically bonded impurities from the surface of the powder in a process called degassing or outgassing. ![]()
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