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Improvement of BET specific surface area reproducibility by No. 4 AFSM.

Improvement of BET specific surface area reproducibility by No. 4 AFSM.

This is an introduction to a method for evaluating adsorption amounts based on the free space measured at various times during the measurement!

In this document, we introduce the improvement of reproducibility of BET specific surface area by AFSM using figures and graphs. The Free Space Continuous Measurement; AFSM: Advanced Free Space Measurement (patented) is a method that evaluates the amount of adsorption based on the free space measured in real-time during the measurement, without needing to maintain the liquid level of the refrigerants such as LN2 or LAr during adsorption isotherm measurements. By using the free space measured at each adsorption equilibrium point, it is possible to consider changes in room temperature during the measurement and changes in the temperature of liquid nitrogen due to oxygen dissolution, enabling accurate and highly reproducible evaluation of adsorption amounts. *For more details, please refer to the PDF document or feel free to contact us.

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What information can be obtained from the adsorption isotherm?

What information can be obtained from the adsorption isotherm?

It is possible to analyze pore size distribution! This is a document introducing information obtained from adsorption isotherms.

This document introduces information obtained from adsorption isotherms using graphs. The adsorption isotherm is represented with the horizontal axis as pressure (P) or relative pressure (p/p0) at a constant temperature, and the vertical axis as the amount adsorbed (STP: standard conditions: 273.15 K, 100 kPa). When performing specific surface area and pore distribution analysis, the horizontal axis is expressed as the relative pressure obtained by dividing the pressure (equilibrium pressure) at each measurement point by the saturation vapor pressure, resulting in a range from 0 to 1. At 0, it represents the state after pretreatment, and at 1, it indicates that adsorbed molecules are filled in all pores (saturation state). *For more details, please refer to the PDF document or feel free to contact us.

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Technical Information: Adsorption Isotherm

Technical Information: Adsorption Isotherm

Measured a higher adsorbate density than in the gas phase! Introduction to adsorption isotherms.

A graph that measures the changes in pressure and adsorption amount while keeping the material at a constant temperature is called an "adsorption isotherm." Generally, the horizontal axis represents the relative pressure (P/P0), which is the equilibrium pressure divided by the saturation vapor pressure, taking values from 0 to 1. At P/P0 < 1, it indicates that the adsorbed gas condenses within the sample tube, meaning that the adsorption isotherm begins to show the interaction forces between the solid and the adsorbed molecules at pressures lower than the saturation vapor pressure, leading to adsorption and condensation, and it measures a higher adsorption density than in the gas phase. Additionally, in the constant volume method, the amount of adsorption is typically expressed in V/ml (STP) g-1, representing the volume of gas at standard conditions (0 °C, 1 atm). *For more details, please refer to the related links or feel free to contact us.*

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