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Evaluation of Mesopores in Porous Silica by the BJH Method No. 7

Evaluation of Mesopores in Porous Silica by the BJH Method No. 7

This is a document introducing the evaluation of mesopores in porous silica using the BJH method!

This document introduces the evaluation of mesopores in porous silica using the BJH method, utilizing graphs and other visuals. The pore distribution of mesopores, analyzed using the BJH theory (Barrett-Joyner-Halenda), is based on three assumptions derived from the adsorption isotherm. Due to capillary phenomena, the saturation vapor pressure of the adsorbate decreases within mesopores (macropores) at a given temperature, leading to the condensation of the adsorbate (= capillary condensation). 【Three Assumptions of BJH Theory】 ■ Pore shape is cylindrical ■ The meniscus is hemispherical with a contact angle of 0° ■ Correction for the adsorbed layer (thickness t) *For more details, please refer to the PDF document or feel free to contact us.

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Evaluation of Mesopores in Mesoporous Zeolite by the No. 8 INNES Method

Evaluation of Mesopores in Mesoporous Zeolite by the No. 8 INNES Method

You can calculate the meniscus diameter and make thickness corrections to evaluate the pore diameter!

This document introduces the evaluation of mesopore characteristics of mesoporous zeolites using the INNES method, accompanied by images and graphs. When analyzing the pore distribution of materials with mesopores from adsorption isotherms, it is essential to make assumptions about the pore shape. If the pore shape is cylindrical, the BJH method is used; if it is slit-shaped, the INNES method is employed. Similar to the BJH method, the INNES method uses the Kelvin equation to calculate the meniscus diameter and performs thickness corrections to evaluate the pore diameter. *For more details, please refer to the PDF document or feel free to contact us.*

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Evaluation of Micropores of Activated Carbon AX21 by HK Method No. 16

Evaluation of Micropores of Activated Carbon AX21 by HK Method No. 16

This is an introduction to the evaluation of micropores of activated carbon AX21 according to HK law!

This document introduces the evaluation of micropores of activated carbon AX21 according to the HK method, using figures and graphs. The HK (Horvath-Kawazoe) method and the SF (Saito-Foley) method are evaluation methods specifically for pore distribution in micropores. Horvath-Kawazoe assumes carbon slit-type pores and calculates the average potential experienced by adsorbed molecules within the micropores using the Lennard-Jones potential. *For more details, please refer to the PDF document or feel free to contact us.

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Evaluation of Micropores in Mesoporous Zeolite by SF Method No. 17

Evaluation of Micropores in Mesoporous Zeolite by SF Method No. 17

[Information] Introduction to the evaluation of micropores in mesoporous zeolite using the SF method!

This document introduces the evaluation of micropores in mesoporous zeolites using the SF method, utilizing figures and graphs. The SF (Saito-Foley) method assumes cylindrical micropores and derives the relationship between pore diameter and relative pressure through an extended version of equation 1 from the HK method. The H+ type ZSM-5, prepared by heating NH4 type ZSM-5 (MFI type zeolite) at 535°C for 3 hours under atmospheric pressure, consists of aggregates of polyhedral layered particles around 200 nm, with slit-shaped pores confirmed between the particles. *For more details, please refer to the PDF document or feel free to contact us.

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