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Simple models of adsorption in nanotubes
Sylwester Furmaniak1, Artur P Terzyk, Piotr A Gauden
1Physicochemistry of Carbon Materials Research Group, Department of Chemistry, N. Copernicus University, Gagarin St. 7, 87-100 Toruń, Poland.
Journal of Colloid and Interface Science
|January 24, 2006
Summary
We developed simple adsorption models for cylindrical pores, validating them with carbon nanotube data. These models accurately estimate internal nanotube diameters up to 5 nm.
Area of Science:
- Physical Chemistry
- Materials Science
- Nanotechnology
Background:
- Adsorption phenomena in porous materials are crucial for applications like gas storage and catalysis.
- Existing models often simplify pore geometry, limiting their accuracy for complex structures like carbon nanotubes.
Purpose of the Study:
- To introduce two simplified adsorption models for cylindrical pores.
- To validate these models against experimental and simulated adsorption data in carbon nanotubes.
Main Methods:
- Development of layer-by-layer adsorption models considering cylindrical geometry.
- Incorporation of adsorbate-adsorbate interactions using the Fowler-Guggenheim lattice model.
- Fitting model parameters to adsorption data for nitrogen in carbon nanotubes.
Main Results:
- The proposed models successfully described simulated adsorption data from Ohba and Kaneko.
- A strong agreement was found between the models' predictions and the Salmas and Androutsopoulos equation for monolayer capacity.
- Calculated pore diameters closely matched those determined by HRTEM, GCMC simulations, and the IDBdB model for experimental data.
Conclusions:
- The simple and rapid models are effective for estimating internal nanotube diameters up to approximately 5 nm.
- The models provide a valuable first approximation for characterizing nanoporous materials.
- The findings support the applicability of simplified theoretical approaches in nanoscience.