BET Surface Area Analysis

Surface Area Analysis is the measurement of a material’s surface area by analysing the physical absorption of gas molecules on its surface. Surface area and porosity are important physical properties that influence the quality and utility of materials and products. In order to perform this function a Brunauer-Emmett-Teller (BET) surface area analyser is used.

The instrument is a fully-automated, three station BET surface area and porosity analyser. The three sample ports can operate simultaneously, and independently of each another ensuring measurements can be performed rapidly. The three stations means repeat sample tests can be performed simultaneously – or three separate samples can be tested independently to improve speed of results achieved.

To visualise this process, imagine a ball on a nano-scale. This is placed in the instrument and the nitrogen gas is absorbed onto the surface. The number of gas molecules absorbed onto the material sample in this way provides an indication of material size. These results are calculated and presented in the format of surface area per mass of sample m²/g.

The BET surface area analyser is able to measure surface areas as low as 0.01 m2/g with the standard nitrogen system. Typical applications for this system include, but are not limited to, battery manufacturing, pharmaceutical applications, bio-char and carbon black characterisation.

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