Softening upon Adsorption in Microporous Materials: A Counterintuitive Mechanical Response

Mouhat, Félix; Bousquet, David; Boutin, Anne; Bourg, Lila Bouëssel du; Coudert, François‐Xavier; Fuchs, Alain H.

doi:10.1021/acs.jpclett.5b01965

Cited by 23 publications

(27 citation statements)

References 45 publications

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“…The authors conclude that it is constant, i.e., it does not change during the course of adsorption, as discussed in some previous studies. 130,131 The two PSDs, from adsorption isotherm and from strain isotherm, are close. Hence, the authors conclude that the analysis of strain isotherms is a viable approach to analyze pore-size distributions of microporous carbons.…”

Section: B Characterization Of Porous Materialsmentioning

confidence: 83%

“…130 A more recent MC simulation study has shown an opposite effect: decrease of the elastic modulus for a slit pore model and for a more complex model representing ELM-11 MOF upon adsorption of LJ fluid. 131 Interestingly, the elastic properties of the fluids adsorbed in nanoporous materials also change compared to the bulk fluid. This change was not only shown by Monte Carlo simulations 132 but also measured in ultrasonic experiments.…”

Section: Coupling Between Thermodynamic and Elastic Aspects Of Adsmentioning

confidence: 99%

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Adsorption-induced deformation of nanoporous materials—A review

Gor

Huber

Bernstein

2017

Applied Physics Reviews

212

214

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When a solid surface accommodates guest molecules, they induce noticeable stresses to the surface and cause its strain. Nanoporous materials have high surface area and, therefore, are very sensitive to this effect called adsorption-induced deformation. In recent years, there has been significant progress in both experimental and theoretical studies of this phenomenon, driven by the development of new materials as well as advanced experimental and modeling techniques. Also, adsorption-induced deformation has been found to manifest in numerous natural and engineering processes, e.g., drying of concrete, water-actuated movement of non-living plant tissues, change of permeation of zeolite membranes, swelling of coal and shale, etc. In this review, we summarize the most recent experimental and theoretical findings on adsorption-induced deformation and present the state-of-the-art picture of thermodynamic and mechanical aspects of this phenomenon. We also reflect on the existing challenges related both to the fundamental understanding of this phenomenon and to selected applications, e.g., in sensing and actuation, and in natural gas recovery and geological CO2 sequestration.

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Section: B Characterization Of Porous Materialsmentioning

confidence: 83%

Section: Coupling Between Thermodynamic and Elastic Aspects Of Adsmentioning

confidence: 99%

Adsorption-induced deformation of nanoporous materials—A review

Gor

Huber

Bernstein

2017

Applied Physics Reviews

212

214

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“…While effect (i) potentially causes apparent changes of the mechanical parameters, there may also be actual changes of the stiffness of the nonporous backbone resulting from the strain of the nonporous phase or the adsorption process (see, e.g., refs (80) and (81)).…”

Section: Resultsmentioning

confidence: 99%

Adsorption-Induced Deformation of Hierarchically Structured Mesoporous Silica—Effect of Pore-Level Anisotropy

et al. 2017

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The goal of this work is to understand adsorption-induced deformation of hierarchically structured porous silica exhibiting well-defined cylindrical mesopores. For this purpose, we performed an in situ dilatometry measurement on a calcined and sintered monolithic silica sample during the adsorption of N2 at 77 K. To analyze the experimental data, we extended the adsorption stress model to account for the anisotropy of cylindrical mesopores, i.e., we explicitly derived the adsorption stress tensor components in the axial and radial direction of the pore. For quantitative predictions of stresses and strains, we applied the theoretical framework of Derjaguin, Broekhoff, and de Boer for adsorption in mesopores and two mechanical models of silica rods with axially aligned pore channels: an idealized cylindrical tube model, which can be described analytically, and an ordered hexagonal array of cylindrical mesopores, whose mechanical response to adsorption stress was evaluated by 3D finite element calculations. The adsorption-induced strains predicted by both mechanical models are in good quantitative agreement making the cylindrical tube the preferable model for adsorption-induced strains due to its simple analytical nature. The theoretical results are compared with the in situ dilatometry data on a hierarchically structured silica monolith composed by a network of mesoporous struts of MCM-41 type morphology. Analyzing the experimental adsorption and strain data with the proposed theoretical framework, we find the adsorption-induced deformation of the monolithic sample being reasonably described by a superposition of axial and radial strains calculated on the mesopore level. The structural and mechanical parameters obtained from the model are in good agreement with expectations from independent measurements and literature, respectively.

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“…Adsorption can modify the apparent elastic properties of the adsorbent and lead to either an apparent stiffening or an apparent softening of the adsorbent [29,30]. The apparent stiffness of the adsorbent is a function of the stiffness of the dry adsorbent and of how the adsorption isotherm depends on both the strain of the adsorbent and the chemical potential of the adsorbate [9].…”

Section: Impact Of Adsorption On Mechanical Propertiesmentioning

confidence: 99%

Coupling between adsorption and mechanics (and vice versa)

Vandamme

2019

Current Opinion in Chemical Engineering

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Adsorption can deform porous solids, and mechanical stresses or strains can impact the adsorption process: this mini-review is dedicated to this coupling. After introducing some frameworks used to predict adsorption-induced strains, the question of how important it is to take into account the impact of mechanics on the adsorption process is addressed. Finally, some specific complexities (e.g., of the microstructure, or of the mechanical behavior of the adsorbent) that the community aims at integrating into the prediction of adsorption-induced strains are addressed. 2. Some frameworks to predict adsorption-induced strains The discussion in this section is quite generic and disregards specific complexities of the material, which will be addressed later in the manuscript. A first pore-scale approach to predict adsorption-induced strains is a thermodynamic one, which consists in identifying the energy to minimize in the so-called osmotic ensemble, which is the right thermodynamic ensemble to address adsorption-induced deformations [4]. Through this approach, Ravikovitch and Neimark [5] first showed that adsorption induces a mechanical stress (sometimes

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Softening upon Adsorption in Microporous Materials: A Counterintuitive Mechanical Response

Cited by 23 publications

References 45 publications

Adsorption-induced deformation of nanoporous materials—A review

Adsorption-induced deformation of nanoporous materials—A review

Adsorption-Induced Deformation of Hierarchically Structured Mesoporous Silica—Effect of Pore-Level Anisotropy

Coupling between adsorption and mechanics (and vice versa)

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