📋 Workflow
Full workflow, products add-to-cart directly1
Weigh and load
15 minWeigh the sample accurately into the sample tube and record initial mass.
💡 Tip Scale sample mass to expected surface area
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2
Degas
HoursRemove adsorbed moisture and impurities under vacuum and heat.
💡 Tip Stay below the decomposition temperature
⚠️ Caution Excess heat can collapse pores
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3
N₂ sorption run
4–8 hRecord N₂ adsorption and desorption isotherms at liquid N₂ temperature.
💡 Tip Keep the Dewar full to hold temperature
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4
Calculate
30 minApply BET and BJH models for surface area, pore size, and volume.
💡 Tip Use the linear region for BET
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⚠️ 5 Common Beginner Mistakes
- ① Poor degassing underestimates area
- ② Overheating damages pores
- ③ Too little sample degrades signal
- ④ Low LN₂ causes drift
- ⑤ Wrong linear range skews results
❓ FAQ
+Low BET value?
Re-check degassing completeness and linear region.
+Hysteresis not closing?
Often due to micropores or slow equilibration.
+Can micropores be measured?
Yes, use argon or CO₂ and longer equilibration.