A New Isotherm for Multisite Occupancy Adsorption of Binary Gaseous Mixtures

Azizian, Saeid; Bashiri, Hadis

doi:10.1021/la803675h

Cited by 11 publications

(4 citation statements)

References 35 publications

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“…The last example reinforces the discussion above. Namely, the possibility of understanding the adsorption process from a detailed knowledge of the spatial configuration of the molecules in the adsorbed state represents a qualitative difference with the previous generation of models for k -mer adsorption, which assumes isotropy in the adlayer. − ,,− , Consequently, the theory presented here (1) represents a significant qualitative advance in our understanding of the adsorption of rigid k -mers and (2) is the most accurate and complete approximation to this complex problem.…”

Section: Resultsmentioning

confidence: 95%

“…On the basis of the latter models, generalizations have been made to take into account the effects of geometric confinement, heterogeneity in adsorbent sites, − mixtures of gases, − lateral interactions, , multilayer adsorption, − and other factors neglected in the classical theories. In all of these systems of hard nonspherical colloidal particles, the orientation of the molecules can significantly affect the entropic contribution to the adsorbate’s free energy.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New Isotherm for Multisite Occupancy Adsorption of Long, Straight Rigid Rods

2011

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The adsorption of long, straight rigid rods of length k (k-mers) on 2D lattices is described by using a new theoretical approach based on a generalization of the classical Guggenheim-DiMarzio approximation. In this scheme, the Helmholtz free energy and its derivatives are written in terms of the order parameter δ, which characterizes the nematic phase occurring in the system at intermediate densities. Then, using the principle of minimum free energy with δ as a parameter, the main adsorption properties are calculated. Comparisons with Monte Carlo simulations are performed in order to test the validity of the theoretical model. The obtained results indicate that the new thermodynamic description is significantly better than the existing theoretical models developed to treat the polymer adsorption problem.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

New Isotherm for Multisite Occupancy Adsorption of Long, Straight Rigid Rods

2011

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“…There have been several modifications to the MSOM model in the literature. This includes extensions proposed by Bai et al (2003), Azizian and Bashiri (2009), and Romanielo et al 2014.…”

Section: Multisite Occupancy Model (Msom)mentioning

confidence: 99%

A review on polymer, gas, surfactant and nanoparticle adsorption modeling in porous media

Mohammed

Afagwu

Adjei

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Adsorption is a rock surface phenomenon and has increasingly become popular, especially in particle-transport applications across many fields. This has drawn a remarkable number of publications from the industry and academia in the last decade, with many review articles focused on adsorption of polymers, surfactants, gas, and nanoparticles in porous media with main applications in Enhanced Oil Recovery (EOR). The discussions involved both experimental and modeling approaches to understanding and efficiently mimicking the particle transport in a bid to solve pertinent problems associated with particle retention on surfaces. The governing mechanisms of adsorption and desorption constitute an area under active research as many models have been proposed but the physics has not been fully honored. Thus, there is a need for continuous research effort in this field. Although adsorption/desorption process is a physical phenomenon and a reversible process resulting from inter-molecular and the intramolecular association between molecules and surfaces, modeling these phenomena requires molecular level understanding. For this reason, there is a wide acceptance of molecular simulation as a viable modeling tool among scientists in this area. This review focuses on existing knowledge of adsorption modeling as it relates to the petroleum industry cutting across flow through porous media and EOR mostly involving polymer and surfactant retention on reservoir rocks with the associated problems. The review also analyzes existing models to identify gaps in research and suggest some research directions to readers.

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“…In these isotherms, it is assumed that an adsorbed molecule occupies one state in the lattice of adsorbent sites. Recently, we proposed a new isotherm by statistical thermodynamic for multisite occupancy adsorption of binary gaseous mixture (Azizian and Bashiri, 2009). …”

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confidence: 99%