Physical Adsorption of Gases and Vapors on Solids

Brunauer, Stephen; Copeland, L. E.

doi:10.1520/stp45679s

Cited by 182 publications

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“…The inverse siope of this line gives a value for the density of water removed from the system studied. With the exception of the magnesium oxychloride cement system, the values obtained in this study were realistic and similar to values for adsorbed water in other systems (6). It is probable that helium entered all the space made accessible by the removal of water.…”

Section: Discussionsupporting

confidence: 83%

The significance of helium diffusion measurements in studying the removal of structural water in inorganic hydrated systems

Beaudoin

Feldman

1978

Cement and Concrete Research

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/0008-8846(78)90011-X Cement and Concrete Research, 8, 2, pp. 223-31, 1978-03-01 The significance of helium diffusion measurements in studying the removal of structural water in inorganic hydrated systems Beaudoin, J. J.; Feldman, R. F. ABSTRACTHelium diffusion studies were made on six different inorganic hydrated systems: portland cement, magnesium oxysulfate, magnesium oxychloride, tricalcium silicate, gypsum and selected molecular sieves. The helium intake versus time curves obtained af ter s truc tural water was removed incrementally, starting at 11% RH, provided data that enabled an assessment of the changing character of the solid phase. Changes in solid volume and solid density were monitored as water was removed from these systems. Factors in£ lwncing physico-chemical processes such as structural collapse due to removal of interlayer or compositional water are discussed with reference to the systems studied. This comparative study also provided a further elucidation of the factors that affect the relocation of the water molecule into the structure .Des 6tudes de la diffusion de l'h6lium ont St6 faites sur six dif f 6rentes compositions inorganiques hydra t6es : le ciment Portland, l'oxysulfate de magngsium, l'oxychlorure de magnEsium, le silicate tricalcium, le gypse et des tamis mol6culaires choisis. La prise dfh61ium contre les courbes de temps obtenues, aprzs que l'eau structurale par accroissement ait 6tE enlevEe P partir d'une humidit6 relative de 11%, a produit des donn6es qui permettent une Evaluation des propri6t6s changeantes de la phase solide. Les changements de volume et de.densitE du solide ont 6t6 observ6s P mesure qu'on r6duisait la teneur en eau de ces compositions. Les facteurs influengant les proc6dEs physic-chimiques tel que l'effondrement structural P cause de l'enlevement de l'eau P l'intercouche ou de l'eau composante, sont discut6s en faisant r6f6rence aux compositions 6tudiEes. Cette 6tude comparative permet de tirer au clair les facteurs qui influencent la relocalisation de l'eau mol6culaire dans la composition.

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Section: Discussionsupporting

confidence: 83%

The significance of helium diffusion measurements in studying the removal of structural water in inorganic hydrated systems

Beaudoin

Feldman

1978

Cement and Concrete Research

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“…In the instance of cholestyramine the results can be described by an adsorption isotherm analogous to that of Langmuir (or BET type I ; Brunauer, 1945) for adsorption from the gas phase. Treating the process in the usual way, as a quasi-chemical equilibrium (Ponec, Knor & cerny, 1974 in which c is the concentration of free sodium cholate, A is the no.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of bile salts from aqueous solution by plant fibre and cholestyramine

Oakenfull

Fenwick

1978

Br J Nutr

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I . Adsorption of bile salts by dietary fibre is believed to promote their excretion and hence to reduce the serum cholesterol level in man and experimental animals.2. We have tested a number of plant fibre fractions and other related materials for their ability to adsorb bile salts from aqueous solution. The 'insoluble' plant fractions were from 'dry grain' (a residue from brewing), apple, wheat bran, lucerne (Medicago sutiva), soya beans, mung beans (Phaseolus mungo), chick peas (Cicer arietinum), rolled oats, spinach (Spinaciu oleracea), sunflower seeds, sawdust and sheep faeces. The other materials were cholestyramine, pectin and lignins prepared from wheat bran and from sawdust.3. Only cholestyramine and the fibre from lucerne, soya beans, mung beans, chick peas, spinach, and sunflower seeds adsorbed enough of either sodium cholate or sodium deoxycholate for adsorption to be detectable. 4.This result conflicts with a report that the lignin component of dietary fibre is responsible for adsorption of bile salts. 5.Adsorption of bile salts, when it occurs, may depend on the presence of saponins bound to the fibre.

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“…Examination of the low pressure adsorption iso therms shown in Figure 6 indicates concavity of the curves toward the pressure axis. The high pressure adsorption isotherms shown in Figure 8 are not typical of any of the five types of adsorption classified by Brunauer (1945).…”

Section: Calculationsmentioning

confidence: 93%

“…The subject of the thermodynamics of gas adsorption is reviewed by Hill (1952) proximations that the volume of the surface phase is neg ligible in comparison with the volume of the gas phase, and that the unadsorbed gas may be treated as an ideal gas, two different heat functions may be derived (Hill 1952 The adsorption process may generally be class ified in one of two categories, depending on the magnitude of the energy of interaction between the gas and the solid. According to Brunauer (1945), there are five principal types of physical adsorption, as characterized by the shape of the adsorption isotherm. This distinction is useful in a qualitative sense only since many adsorption isotherms may not be classified in this manner.…”

Section: Adsorption Of a Gas On A Solidmentioning

confidence: 99%

Adsorption of methanol vapor on silver iodide

Edwards¹

1967

J. Phys. Chem.

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Physical Adsorption of Gases and Vapors on Solids

Cited by 182 publications

References 0 publications

The significance of helium diffusion measurements in studying the removal of structural water in inorganic hydrated systems

The significance of helium diffusion measurements in studying the removal of structural water in inorganic hydrated systems

Adsorption of bile salts from aqueous solution by plant fibre and cholestyramine

Adsorption of methanol vapor on silver iodide

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