Sample preparation and measurement conditions Sample Clauses

Sample preparation and measurement conditions. The procedure for measuring the surface area by nitrogen adsorption isotherms is according to ISO (2006, 2007 and 2010) and IUPAC (1985). The most critical step in the measurement is the outgassing stage, i.e. to clear the clear the adsorbent surface to any adsorbed molecules before the measurements. The outgassing process of the solid sample can be performed at room temperature, or at a higher temperature to promote desorption of strongly adsorbed species. The pre-treatment conditions must remain sufficiently mild to avoid any modification of the textural characteristics of the sample but severe enough to obtain a good surface clean-up. It is recommended to perform the pre-treatment in the cell used to carry out the adsorption. Whatever the temperature, the solid must be submitted to a minimum vacuum of 10-2 Nm-2 i.e. 10 mPa during at least one hour. Such conditions are readily achieved with the aid of conventional vacuum equipment, usually a combination of a rotary and diffusion pump. In general, the lower the temperature, the longer the outgassing process should be. For more detailed description of the isotherms, its always recommend using as many experimental points as possible.
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