Adsorption-induced deformation of nanoporous materials—A review

Abstract

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.

SAPO‐34 Framework Contraction on Adsorption of Ammonia: A Neutron Scattering Study

“…The collected data show the adsorption of ammonia into the chabazite cage, resulting in shrinkage of the zeolite lattice. The literature suggests that both swelling and shrinking of a zeolite may occur when gas is adsorbed, depending on the conditions and interaction between framework and sorbate . The systems reported to date are mostly limited to weakly adsorbed phases that display swelling at moderately elevated pressures.…”

“…Whilst this intuitively makes sense, a zeolite does not have a single rigid pore size, and these materials often display unpredictable expansion and contraction behaviour . This may present as a negative thermal expansion across a limited temperature range or initial contraction, followed by expansion upon adsorption . The dynamic nature of the pore size is often not addressed, although it seems likely that there will be some degree of framework motion associated with accommodating a guest sorbate molecule.…”

Hydrogen bonding interactions of H2O and SiOH on a boroaluminosilicate glass corroded in aqueous solution

“…In real applications, corroded sample might be exposed to dry cycles between fully immersed periods in aqueous solutions, and adsorption and desorption of molecular water could make porous alteration layers susceptible to sorption-induced deformation. 75 The stability of alteration layer therefore could be reduced. The deformation of alteration layer with respect to changes in relative humidity and solution conditions (pH, electrolyte concentration, type of electrolyte, etc.)…”

Capillarity-Driven Oil Flow in Nanopores: Darcy Scale Analysis of Lucas–Washburn Imbibition Dynamics

“…The two types will be termed V5 (r 0 = 3.4 nm, φ 0 =0.315±0.005) and V10 (r 0 = 5.0 nm, φ 0 =0.3±0.005) in the following. The characterization of the matrix properties, in particular r 0 , relies on volumetric nitrogen sorption isotherms performed at 77 K. [48] The relatively low porosity along with the high elastic modulus of the silica glass renders any liquid-uptake-induced mechanical deformation negligible [66], in the sub-percent range. Any impact of swelling or contraction, which in principle could affect the imbibition process significantly [67] can thus be ignored.…”