The Finite Pore Volume GAB Adsorption Isotherm Model as a Simple Tool to Estimate a Diameter of Cylindrical Nanopores
| Autor: | Piotr A. Gauden, Piotr Kowalczyk, Sylwester Furmaniak, Radosław Miśkiewicz, Maria Lezanska, Anna Błajet-Kosicka |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
cylindrical pores
N2 adsorption Materials science Pharmaceutical Science Thermodynamics Carbon nanotube Article Analytical Chemistry law.invention lcsh:QD241-441 Adsorption lcsh:Organic chemistry law Approximation error Drug Discovery Monolayer isotherm models Physical and Theoretical Chemistry Series (mathematics) Organic Chemistry Nanopore Surface-area-to-volume ratio Volume (thermodynamics) Chemistry (miscellaneous) type IV isotherm Molecular Medicine |
| Zdroj: | Molecules Volume 26 Issue 6 Molecules, Vol 26, Iss 1509, p 1509 (2021) |
| ISSN: | 1420-3049 |
| DOI: | 10.3390/molecules26061509 |
| Popis: | The finite pore volume Guggenheim–Anderson–de Boer (fpv-GAB) adsorption isotherm model has been considered as a simple tool which not only enables us to analyze the shape of isotherms theoretically, but also provides information about pore diameter. The proposed methodology is based on the geometrical considerations and the division of the adsorption space into two parts: the monolayer and the multilayer space. The ratio of the volumes of these two spaces is unambiguously related to the pore diameter. This ratio can be simply determined from the N2 adsorption isotherm by its fitting with the use of fpv-GAB model. The volume ratio is equal to the ratio of the adsorption capacities in the monolayer and the multilayer—two of the best-fit parameters. The suggested approach has been verified using a series of isotherms simulated inside ideal carbon nanotubes. The adsorption data for some real adsorbents has also been used during tests. The studies performed have proven that diameters estimated with the use of the proposed method are comparable with the geometrical sizes or diameters published by others and based on the application of more sophisticated methods. For pores wider than 3 nm, the relative error does not exceed a few percent. The approach based on the fpv-GAB model reflects well the differences in pore sizes for the series of materials. Therefore, it can be treated as a convenient tool to compare various samples. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|