Crystal oscillator 2.5*2.0mm 2520, 0.67M~170M OSC available at any frequency
Probe current voltage pin with 420*4450 head diameter of 5.0, over current and voltage pin
TP-IP4220CZ6, 5V, 0.35PF breakdown voltage of 6V, SOT package
1206 side full color side light
The Multi-point BET Equation and Pressure Point Selection Principle The pressure point measurement and calculation range (0.05–0.35) provided on the instrument is suitable for most mesoporous samples but may not be ideal for all types of materials. When analyzing BET results, it's essential to assess whether the selected data points and the C constant are reasonable. Avoid using too low relative pressure points: Some data points are very close to the origin (0,0), which may not form a proper monolayer, making them unsuitable for calculating specific surface area. Avoid using too high relative pressure points: - Incorrect data points can lead to poor linear regression. - A negative C constant (negative intercept) may appear, indicating invalid data. - The upper limit of BET is often determined by the maximum single-point BET value (as shown in the figure on the right). Cases where the BET equation is not applicable: - Not all samples will show a clear maximum point as illustrated in the right figure. - Some samples may have a single-point BET that doesn’t reach a peak and instead increases with pressure, indicating a large micropore area below P/P0 < 0.15. - In such cases, BET analysis may not be appropriate for the sample. Discard low-end unbalanced pressure points (see Figure 1 on the right). It's recommended to use no fewer than three points, ideally five. Always ensure data points are equidistant or as close to equidistant as possible. Do not discard intermediate data unless statistical tests confirm significant deviations. Confirm the behavior of the sample under BET conditions at higher pressures: - If the BET curve rises within the "normal" range, the sample may adsorb more than the theoretical BET value, suggesting the need for lower-pressure data (common in microporous samples). - If the curve bends within the normal range (see Figure 2), it indicates the sample adsorbs less than the theoretical value, with stronger multilayer adsorption, especially in narrow mesopores (2–4 nm) due to capillary condensation. Autosorb-1MP/C Improvements 2, MCM-48, and some MCM-41, stearic acid, and stearate compounds. This detailed guide helps users understand how to properly select and interpret BET data, ensuring accurate surface area measurements across various sample types.
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