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Technical article

Notes: Testing the specific surface area of graphite by Dynamic BET method

Views:2429 Date:2014-12-16

First, weigh the samples. Weigh between 0.5g and 2.5g weight (smaller surface area, the more weight needed). E.g., the specific surface area of graphite is 5 m2/g, you can weigh 1.5g.

 

Second, set the pretreatment conditions. Processing temperature is 200 ° C, and the time is 2 hours. Vacuum degree is less than 0.01. If the sample is just produced, the sample may contain more water. It is recommended to dry for 1-2 hours at 100 ° C in the oven and then weigh the dried sample, insert preprocessor port for the pretreatment.

 

Third, due to the summer humidity, high temperature, after do a point, it will condense some small drops on the sample tube. When you do the BET experiment, you can use a cotton ball to wipe drops off on the sample tube. It can prevent the presence of drops from affecting the liquid nitrogen and the saturation vapor pressure, and thus ensuring the accuracy of the experimental test data. 

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Record No. 110102003097