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Evaluation of Pore Structure by No. 21 NLDFT Method and GCMC Method

What are the optimal analysis methods and adsorbates for understanding the pore structure of porous materials? Various materials will be introduced as examples.

The NLDFT method assumes pore shape (pore diameter) and determines parameters at the adsorption temperature and pressure, using an approximate formula based on density functional theory for the adsorption density within the pores. The GCMC method calculates the adsorption density through computer simulations that model the adsorption phenomenon after determining the parameters. This document examines which theory, NLDFT or GCMC, is more suitable for pore distribution analysis, and how useful N2 adsorption is. We encourage you to read it. 【Contents (partial)】 ■ Figure 1 Local isotherms for 4nm and 10nm using NLDFT and GCMC (adsorption branch Ar@87.3 K) ■ Figure 2 Adsorption isotherms for MCM41 (N2@77.4 K, Ar@87.3 K) ■ Figure 3 Pore distribution (pore volume) for MCM41 (N2@77.4 K, Ar@87.3 K) ■ Figure 4 Adsorption isotherms for MFI1000H (N2@77.4 K, Ar@87.3 K) ■ Figure 5 Pore distribution (pore volume) for MFI1000H (N2@77.4 K, Ar@87.3 K) *For more details, please refer to the PDF document or feel free to contact us.

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No. 22 Evaluation of Pore Structure of Activated Carbon Fiber by GCMC Method

Modeling the pore structure from the pore distribution evaluation of activated carbon fibers using the GCMC method.

In this document, we evaluate the pore structure of activated carbon fibers (ACF) with slit-type pores using the GCMC method, and based on these results, we are examining pore shape models. Using the BELSORP MAX, we measured the N2 adsorption isotherm at 77.4 K for ACF (KURACTIVE FT-07) at ultra-low relative pressure (p/p0=1E-8) (pre-treatment: 300°C, 12 h). The measured adsorption isotherm is illustrated alongside the ideal adsorption isotherm calculated using the slit and carbon N2@77.4K GCMC kernel. We encourage you to read it. [Contents] ■ Figure 1: Adsorption isotherm of activated carbon fibers (ACF) (N2@77.4K) (pre-treatment: 573 K, 12 h, vac) ■ Figure 2: Comparison of the measured adsorption isotherm of ACF (N2@77.4K) and the ideal adsorption isotherm by GCMC method ■ Figure 3: Pore distribution (pore volume) and cumulative distribution (ΣVp) of ACF by GCMC method ■ Table 1: Comparison of ultra-super-micropore capacity of ACF by GCMC method ■ Figure 4: Slit pore model of ACF *For more details, please refer to the PDF document or feel free to contact us.

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