I want to do BET surface area analysis of Ni foam sample. what will be the degassing time and temperature and number of points to be consider for analysis. and any other specific details to follow?
The degassing time and temperature for BET surface area analysis of Ni foam samples depend on various factors such as the type of instrument, the nature of the sample, and the adsorbate used. Typically, the following degassing conditions can be used as a starting point:
However, it is always best to follow the manufacturer's guidelines for the specific instrument being used.
Regarding the number of points to consider for analysis, it is recommended to analyze at least three data points for the BET analysis. These data points should be taken from a nitrogen adsorption isotherm that covers a wide range of relative pressures (typically from 0.05 to 0.30). The data points should be evenly distributed along the isotherm to ensure accurate determination of the BET surface area.
Other specific details to follow for BET surface area analysis of Ni foam samples include:
please read the BETpapers or BET instrument technique book, and ask the operator of BETthe first curve adsorption and desorption is very important please check this curve with other papers
Dear Paragjyoti Gohain
Generally degassing performed above 250 °C to remove the adhered gases and moisture before doing BET analysis.
1. Check the stability of foam matrix (Polyurethane-If used) for the Ni loading.
2. Multipoint BET (different % gas) is best for good result.
3. I don’t think nitrogen (N2) BET will accurately work for the foam type samples.
4. Unlike powders where nitrogen (N2) can cover the entire surface area, foam samples present a different challenge due to their structure and porosity.
5. Mercury intrusion porosimetry can be useful for your research. If possible read more about.
Best wishes
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