CLXXV.—The translation motion of molecules in the adsorbed phase on solids

Bangham, D. H.; Fakhoury, Nazim

doi:10.1039/jr9310001324

Cited by 49 publications

(28 citation statements)

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“…One is a pressure in the liquid resulting from the reduction of the pore wall's surface energy, which for wetting fluids should cause monotonic expansion with increasing relative pressure. This effect was first proposed by Bangham and co-workers [3] and is therefore often referred to as "Bangham effect". The corresponding pressure is directly proportional to the reduction of the solid surface energy solid .…”

Section: Sorption-induced Deformationmentioning

confidence: 97%

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Relationship Between Pore Structure and Sorption-Induced Deformation in Hierarchical Silica-Based Monoliths

Balzer

Morak

Erko³

et al. 2015

Zeitschrift Für Physikalische Chemie

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Abstract:Experimental results on sorption-induced deformation during npentane desorption were obtained by in-situ dilatometry and in-situ small angle X-ray scattering (SAXS). The sample investigated was a silica-based monolith with hierarchical pore structure comprising a macroporous network of struts, each strut containing well-defined cylindrical mesopores ordered on a 2D hexagonal lattice. In-situ dilatometry and in-situ SAXS measurements revealed strain isotherms of similar shape, which are qualitatively in good agreement with recent theoretical predictions. From the relative pressure range of the liquid filled mesopores a pore load modulus of 1.5 GPa is determined. The relative pressure region of mono-and multilayer formation, however, reveals differences between the two independent methods. In particular, the net strain at saturation pressure is considerably larger for in-situ dilatometry. We attribute this observation to the different sensitivity of the two methods to anisotropic deformation in the hierarchical solid framework. While in-situ SAXS measures the mesopore lattice strain and is therefore exclusively sensitive to radial deformation of the struts, dilato-*Corresponding authors: Oskar Paris,

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Section: Sorption-induced Deformationmentioning

confidence: 97%

“…The bulk density of the sample and the density of the solid phase are given in Table 1. It should be noted that the solid phase density of 1.75 g/cm 3 is considerably lower than the density of non-porous silica in similar sol-gel derived materials (around 2.1-2.2 g/cm 3 , see e.g. [39]).…”

Section: Pore Structurementioning

confidence: 99%

Relationship Between Pore Structure and Sorption-Induced Deformation in Hierarchical Silica-Based Monoliths

Balzer

Morak

Erko³

et al. 2015

Zeitschrift Für Physikalische Chemie

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“…As follows from Fig. 1, compression of the AUK adsorbent reaching 0.03% at 393 K is observed at tem peratures below 313 K (curves [1][2][3][4] in the region of low and intermediate adsorption values of СН 4 . Com pression is replaced by expansion to 0.3% at an increase in adsorption of СН 4 .…”

Section: Introductionmentioning

confidence: 96%

“…Variation of sur face tension and elastoplastic characteristics of solids under adsorption (the effect of Rebinder) was studied in [2]. In more recent works, the general regularities of adsorption deformation of active carbon were studied during adsorption of benzene, water, and pyridine [3]. In works in the 1970s, adsorption deformation of zeo lite NaA was studied during adsorption of water [4], Kr, and Xe [5].…”

Section: Introductionmentioning

confidence: 99%

Wave sorbostriction: Waves of adsorption deformation of microporous adsorbent

Фомкин

Школин

Петухова

2012

Prot Met Phys Chem Surf

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A new phenomenon is discovered: waves of adsorption deformation or wave sorbostriction of a microporous adsorbent appearing under passage of individual compounds or mixtures thereof in a flow of a carrier gas through it. The method of wave sorbostriction registration is suggested. It is found that the wave amplitude and selectivity of adsorbent sorbostriction depend largely on the mixture composition and physi cochemical properties of its components. The suggested method is used to obtain sorbostriction waves of an AR V microporous carbon adsorbent and passing through it portions of normal hydrocarbons (n pentane, n heptane) and their binary mixtures (n pentane/n heptane) at the ratios of (50/50) vol % at 473 K in the flow of the He carrier gas. The number of maximums on the sorbostriction curve under the optimum condi tions corresponds to the number of components in the mixture.

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“…The method used is based on the least square method of line fitting. The hypothesis about the direct proportionality of (shrinkage) strain to RH (similar to equations in L'Hermite [2] and Bangham and Fakhoury [28]), is made in the whole drying range (100%-20% RH). Consequently, the ESEM test-setup directly relates the change of deformations to the change in relative humidity.…”

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confidence: 99%

Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis

Jankovic

2008

SPIE Proceedings

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Novel modifications of an environmental scanning electron microscope (ESEM) were made in order to measure the local deformations in drying cement paste. These nondestructively determined moisture-induced plane strains, obtained in 1 mm thick cement paste samples, are orthotropic. They vary with variations of relative humidity between 70%-80% and 40%-50%, being the highest at 20% RH. Both drying shrinkage and expansion of cement paste microstructure occur in early-age and mature samples. Microcracking due to moisture gradient could not be avoided, although very thin samples were examined with gradual reduction of relative humidity in drying steps of 10%. The coefficient of deformation of cement paste is directly proportional to shrinkage/expansion. It depends on variations of relative humidity during drying in ESEM and the sample age.

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CLXXV.—The translation motion of molecules in the adsorbed phase on solids

Cited by 49 publications

References 0 publications

Relationship Between Pore Structure and Sorption-Induced Deformation in Hierarchical Silica-Based Monoliths

Relationship Between Pore Structure and Sorption-Induced Deformation in Hierarchical Silica-Based Monoliths

Wave sorbostriction: Waves of adsorption deformation of microporous adsorbent

Nondestructive determination of drying deformations in cement paste by means of ESEM and digital image analysis

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