The surface properties of silica gels. II. Adsorption of water vapour

Sing, K. S. W.; Madeley, J. D.

doi:10.1002/jctb.5010040704

Cited by 24 publications

(3 citation statements)

References 11 publications

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“…However, the hysteresis loop of condensation in mesopores should have a lower limit at the relative pressure at which capillary tension in the mesopore meniscus exceeds the tensile strength of the condensed liquid . The continuation of the hysteresis loop to relative pressure lower than 0.31, the limit value for water, indicates that sorption is not taking place by surface adsorption and pore condensation but by absorption in the material of the cell walls …”

Section: Resultsmentioning

confidence: 99%

“…[19] The continuation of the hysteresis loop to relative pressure lower than 0.31, the limit value for water, indicates that sorption is not taking place by surface adsorption and pore condensation but by absorption in the material of the cell walls. [20] The sorption isotherm of ethanol vapour follows a very different pattern and features a sigmoidal shape with an important delay of uptake. Sorption begins only at p/p higher than 0.3, indicating an activation energy barrier for the penetration of methanol in the material.…”

Section: Sorption Isotherms Of Water-ethanol Vapors On Poplar Veneermentioning

confidence: 99%

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Synergistic Sorption of Mixed Solvents in Wood Cell Walls: Experimental and Theoretical Approach

Aguilera-Segura

Bossu

Corn

et al. 2019

Macromolecular Symposia

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The behavior of poplar wood and its components in water‐ethanol mixtures is investigated through a coupled experimental and theoretical approach including physico‐chemical and dynamic mechanical analyses and molecular dynamics simulations. Affinity for water‐ethanol vapors, measured by isothermal gravimetric sorption experiments, features a maximum for mixed vapors. The longitudinal viscoelastic behavior of the same wood upon immersion in ethanol‐water solutions, measured by dynamic mechanical analysis, features a minimum in storage modulus and a maximum damping upon immersion in solutions of intermediate composition. Optical microscopy observation of solvent‐saturated samples evidences inter‐ and intra‐cellular disbonding in pure ethanol and ethanol aqueous solutions. Molecular dynamics simulations provide information on interactions of water‐ethanol solutions with models of cellulose microfibers and lignin. The relative solvation of cellulose microfibers by water and ethanol shows a nearly linear variation with the composition of the solution. In contrast, the accessibility of lignin dimers to the solvent presents a maximum at intermediate ethanol concentrations, in correspondence with a conformational transition of the dimer towards an extended conformation. The modelization of the interactions of cellulose and lignin in water‐ethanol solutions indicates a minimum of adhesion of the two components of wood in the presence of solutions with intermediate concentrations.

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Section: Resultsmentioning

confidence: 99%

Section: Sorption Isotherms Of Water-ethanol Vapors On Poplar Veneermentioning

confidence: 99%

Synergistic Sorption of Mixed Solvents in Wood Cell Walls: Experimental and Theoretical Approach

Aguilera-Segura

Bossu

Corn

et al. 2019

Macromolecular Symposia

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“…A significant feature of the hysteresis loop is the lack of the sudden step-down of the desorption branch with convergence to the adsorption branch at a relative pressure defined by the nature of the sorbent and by temperature (Ravikovitch and Neimark 2002;Thommes et al 2016). This phenomenon, typical of sorption in mesoporous materials, takes place at p/p° near 0.31 in the case of water at room temperature (Sing and Madeley 1954). This so-called catastrophic desorption occurs when capillary tension in small mesopores exceeds the tensile strength of the condensed liquid (Burgess et al 1989;Trens et al 2005).…”

Section: Pure Solventsmentioning

confidence: 99%

Sorption of water–ethanol mixtures by poplar wood: swelling and viscoelastic behaviour

et al. 2018

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The swelling of wood upon impregnation by aqueous solutions of organic solvents is larger than swelling by pure water. This phenomenon, described as "hyperswelling", results from specific interactions with components of the complex wood microstructure. To understand the combined effect of mixed solvents on wood properties, the specific influence of each solvent on wo od biopolymers and structure must be first characterized. In this study, the effect of th e impregnation of aqueous solutions of ethanol with concentrations from 0 to 100% on the physico-mechanical properties of poplar wood was investigated. For each solution, the sorption behaviour of veneer sapwood samples and the effect of sorption on wood C2MA is member of the European Polysaccharide Network of Excellence (EPNOE), http://www. epnoe .eu.

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A simple model and experiments for adsorption‐desorption hysteresis: Water vapor on silica gel

Rajniak

Yang

1993

AIChE Journal

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A simple model is proposed for the evaluation of the primary and secondary adsorption and desorption processes for hysteresis-dependent sorption systems. The model is based on the use of pore blocking interpretation of hysteresis in an interconnected network of pores. The model is simple to use and requires only the primary adsorption and primary desorption isotherms to predict all secondary desorption and adsorption isotherms. A complete set of equilibrium adsorption-desorption curves covering the hysteresis loop (appearing in the range of relative pressure 0.3-0.7) was measured for water vapor on silica gel at 25°C. The usefulness of the model is supported by its agreement with experimental data.

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The surface properties of silica gels. II. Adsorption of water vapour

Cited by 24 publications

References 11 publications

Synergistic Sorption of Mixed Solvents in Wood Cell Walls: Experimental and Theoretical Approach

Synergistic Sorption of Mixed Solvents in Wood Cell Walls: Experimental and Theoretical Approach

Sorption of water–ethanol mixtures by poplar wood: swelling and viscoelastic behaviour

A simple model and experiments for adsorption‐desorption hysteresis: Water vapor on silica gel

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