Multilayer adsorption on fractal surfaces: Effect of the adsorbate-adsorbate interactions on the sorptional equilibrium

An analytical isotherm equation that can be applied to water vapor-biopolymer systems, was developed. The model describes the multilayer adsorption on fractal surfaces with energetic interactions adsorbate-adsorbate (measure in terms of free energy) different from that of bulk water. Assuming explic...

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Detalles Bibliográficos
Autores principales: Aguerre, R.J., Tolaba, M.P., Suárez, C.
Formato: JOUR
Materias:
Adsorbate-adsorbate interactions on fractal surfaces
Fractal isotherm
Fractality of biopolymers
Adsorption isotherms
Biopolymers
Multilayers
Numerical methods
Phase equilibria
Sorption
Surface phenomena
Water
Adsorbate adsorbate interactions
Fractal dimensions
Fractal surfaces
Sorptional equilibrium
Adsorption
Drying
fractal analysis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07373937_v17_n4-5_p869_Aguerre
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_07373937_v17_n4-5_p869_Aguerre2023-10-03T15:37:52Z Multilayer adsorption on fractal surfaces: Effect of the adsorbate-adsorbate interactions on the sorptional equilibrium Aguerre, R.J. Tolaba, M.P. Suárez, C. Adsorbate-adsorbate interactions on fractal surfaces Fractal isotherm Fractality of biopolymers Adsorption isotherms Biopolymers Multilayers Numerical methods Phase equilibria Sorption Surface phenomena Water Adsorbate adsorbate interactions Fractal dimensions Fractal surfaces Sorptional equilibrium Adsorption Adsorption Drying fractal analysis An analytical isotherm equation that can be applied to water vapor-biopolymer systems, was developed. The model describes the multilayer adsorption on fractal surfaces with energetic interactions adsorbate-adsorbate (measure in terms of free energy) different from that of bulk water. Assuming explicit mathematical functionalities for the variation of the free energy with the number of adsorbed layers, it is possible to evaluate the effect of the adsorbate-adsorbate interactions on the adsorption capacity of solids of high degree of surface irregularity. For those surfaces with relatively low degree of irregularity (D values slightly larger than 2), it results that the free energy variation with the layer number in the multilayer region affects considerably the sorption capacity of the adsorbent, even for water activities lower than those corresponding to the monolayer moisture content. This effect becomes less marked as the fractal dimension increases (D approaching to 3), being relevant for water activities much larger than those corresponding to the monolayer value, only. The isotherm was tested, using published experimental equilibrium data of various biopolymers. An analytical isotherm equation that can be applied to water vapor-biopolymer systems, was developed. The model describes the multilayer adsorption on fractal surfaces with energetic interactions adsorbate-adsorbate (measure in terms of free energy) different from that of bulk water. Assuming explicit mathematical functionalities for the variation of the free energy with the number of adsorbed layers, it is possible to evaluate the effect of the adsorbate-adsorbate interactions on the adsorption capacity of solids of high degree of surface irregularity. For those surfaces with relatively low degree of irregularity (D values slightly larger than 2), it results that the free energy variation with the layer number in the multilayer region affects considerably the sorption capacity of the adsorbent, even for water activities lower than those corresponding to the monolayer moisture content. This effect becomes less marked as the fractal dimension increases (D approaching to 3), being relevant for water activities much larger than those corresponding to the monolayer value, only. The isotherm was tested, using published experimental equilibrium data of various biopolymers. Fil:Aguerre, R.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tolaba, M.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07373937_v17_n4-5_p869_Aguerre
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Adsorbate-adsorbate interactions on fractal surfaces
Fractal isotherm
Fractality of biopolymers
Adsorption isotherms
Biopolymers
Multilayers
Numerical methods
Phase equilibria
Sorption
Surface phenomena
Water
Adsorbate adsorbate interactions
Fractal dimensions
Fractal surfaces
Sorptional equilibrium
Adsorption
Adsorption
Drying
fractal analysis
spellingShingle Adsorbate-adsorbate interactions on fractal surfaces
Fractal isotherm
Fractality of biopolymers
Adsorption isotherms
Biopolymers
Multilayers
Numerical methods
Phase equilibria
Sorption
Surface phenomena
Water
Adsorbate adsorbate interactions
Fractal dimensions
Fractal surfaces
Sorptional equilibrium
Adsorption
Adsorption
Drying
fractal analysis
Aguerre, R.J.
Tolaba, M.P.
Suárez, C.
Multilayer adsorption on fractal surfaces: Effect of the adsorbate-adsorbate interactions on the sorptional equilibrium
topic_facet Adsorbate-adsorbate interactions on fractal surfaces
Fractal isotherm
Fractality of biopolymers
Adsorption isotherms
Biopolymers
Multilayers
Numerical methods
Phase equilibria
Sorption
Surface phenomena
Water
Adsorbate adsorbate interactions
Fractal dimensions
Fractal surfaces
Sorptional equilibrium
Adsorption
Adsorption
Drying
fractal analysis
description An analytical isotherm equation that can be applied to water vapor-biopolymer systems, was developed. The model describes the multilayer adsorption on fractal surfaces with energetic interactions adsorbate-adsorbate (measure in terms of free energy) different from that of bulk water. Assuming explicit mathematical functionalities for the variation of the free energy with the number of adsorbed layers, it is possible to evaluate the effect of the adsorbate-adsorbate interactions on the adsorption capacity of solids of high degree of surface irregularity. For those surfaces with relatively low degree of irregularity (D values slightly larger than 2), it results that the free energy variation with the layer number in the multilayer region affects considerably the sorption capacity of the adsorbent, even for water activities lower than those corresponding to the monolayer moisture content. This effect becomes less marked as the fractal dimension increases (D approaching to 3), being relevant for water activities much larger than those corresponding to the monolayer value, only. The isotherm was tested, using published experimental equilibrium data of various biopolymers. An analytical isotherm equation that can be applied to water vapor-biopolymer systems, was developed. The model describes the multilayer adsorption on fractal surfaces with energetic interactions adsorbate-adsorbate (measure in terms of free energy) different from that of bulk water. Assuming explicit mathematical functionalities for the variation of the free energy with the number of adsorbed layers, it is possible to evaluate the effect of the adsorbate-adsorbate interactions on the adsorption capacity of solids of high degree of surface irregularity. For those surfaces with relatively low degree of irregularity (D values slightly larger than 2), it results that the free energy variation with the layer number in the multilayer region affects considerably the sorption capacity of the adsorbent, even for water activities lower than those corresponding to the monolayer moisture content. This effect becomes less marked as the fractal dimension increases (D approaching to 3), being relevant for water activities much larger than those corresponding to the monolayer value, only. The isotherm was tested, using published experimental equilibrium data of various biopolymers.
format JOUR
author Aguerre, R.J.
Tolaba, M.P.
Suárez, C.
author_facet Aguerre, R.J.
Tolaba, M.P.
Suárez, C.
author_sort Aguerre, R.J.
title Multilayer adsorption on fractal surfaces: Effect of the adsorbate-adsorbate interactions on the sorptional equilibrium
title_short Multilayer adsorption on fractal surfaces: Effect of the adsorbate-adsorbate interactions on the sorptional equilibrium
title_full Multilayer adsorption on fractal surfaces: Effect of the adsorbate-adsorbate interactions on the sorptional equilibrium
title_fullStr Multilayer adsorption on fractal surfaces: Effect of the adsorbate-adsorbate interactions on the sorptional equilibrium
title_full_unstemmed Multilayer adsorption on fractal surfaces: Effect of the adsorbate-adsorbate interactions on the sorptional equilibrium
title_sort multilayer adsorption on fractal surfaces: effect of the adsorbate-adsorbate interactions on the sorptional equilibrium
url http://hdl.handle.net/20.500.12110/paper_07373937_v17_n4-5_p869_Aguerre
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AT tolabamp multilayeradsorptiononfractalsurfaceseffectoftheadsorbateadsorbateinteractionsonthesorptionalequilibrium
AT suarezc multilayeradsorptiononfractalsurfaceseffectoftheadsorbateadsorbateinteractionsonthesorptionalequilibrium
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