Microporosity of Porous Glasses: New Investigation Techniques

Крейсберг, В. А.; Rakcheev, V. P.; Антропова, Т. В.

doi:10.1023/b:gpac.0000007929.82185.20

Cited by 11 publications

(11 citation statements)

References 3 publications

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“…In our recent studies [14][15][16], we proposed using both the equilibrium and kinetic desorption isotherms (the method of diffusion diagnostics) in order to examine porous glasses containing micropores and mesopores simultaneously. The high sensitivity of the mass spectrometric analysis in this method makes it possible to measure micropores with small volumes in the presence of mesopores.…”

Section: Influence Of the Acid Concentration On The Morphology Of Micmentioning

confidence: 99%

“…The polymodal microporosity of porous glasses involving mesopores and micropores 0.35-2.00 nm in size was examined using two new methods based on an analysis of the kinetic and equilibrium desorption isotherms at low relative pressures corresponding to the bulk filling of micropores [15,22].…”

Section: Investigation Techniquesmentioning

confidence: 99%

“…In our previous works [14][15][16], these methods were applied to investigate the influence of the composition of the initial alkali borosilicate glasses and the conditions used for their phase separation on the structure of porous glasses. It was found that porous glasses have not only a through mesoporous substructure but also a polymodal microporous substructure.…”

Section: Investigation Techniquesmentioning

confidence: 99%

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Influence of the acid concentration on the morphology of micropores and mesopores in porous glasses

2006

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The polymodal microporosity and mesoporosity of porous glasses prepared by through leaching of phase-separated alkali borosilicate glasses in hydrochloric acid solutions of different concentrations are investigated by two new methods based on an analysis of the kinetic and equilibrium isotherms of gas desorption at a temperature of 77.5 K under low partial pressures, as well as by a modified classical adsorption method under medium and high pressures. It is established that an increase in the concentration of hydrochloric acid in the leaching solution brings about transformations in the microporous and mesoporous structures of the porous glasses. The structural transformations can be summarized as follows: (i) a considerable decrease in the specific surface of mesopores and the corresponding increase in the diameter of secondary silica globules, (ii) a decrease in the mesopore volume and the corresponding increase in the coordination number of the packing of secondary silica globules in channels formed upon phase separation, (iii) an increase in the diameter of mesopores arising from gaps between secondary silica globules in channels formed upon phase separation, (iv) an increase in the diameter of regions in these channels that are partially or completely free from secondary silica globules, and (v) the formation of ultramicropores with a molecular size of 0.4-0.5 nm.

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Section: Influence Of the Acid Concentration On The Morphology Of Micmentioning

confidence: 99%

Section: Investigation Techniquesmentioning

confidence: 99%

Section: Investigation Techniquesmentioning

confidence: 99%

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Influence of the acid concentration on the morphology of micropores and mesopores in porous glasses

2006

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“…Water diffusivities can be determined by measuring the concentration profile of water molecules or hydroxyl following treatment for known conditions using tritium tracers and analyzing the concentration profile, 11,12 by kinetic measurements of the change in the total water or hydroxyl content as a function of time, 13–21 by measurement of the rate of release of water from a sample during an outgassing treatment, 22,23 or by following the rate of change of a water vapor‐filled bubble diameter during heat treatment 24 . The first method has had very limited application in glasses due to restrictions in using radioactive materials, while the third method is primarily suited for use below the glass transformation temperature.…”

Section: Methodsmentioning

confidence: 99%

“…Other methods used to determine the diffusivity of water in glasses and melts include tritium tracer methods 11,12 and vacuum outgassing into a mass spectrometer system 22,23 . The tritium method requires access to a facility where radioactive material can be used.…”

Section: Methodsmentioning

confidence: 99%

A Limited Review of Water Diffusivity and Solubility in Glasses and Melts

Shelby

2007

Journal of the American Ceramic Society

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A limited review of the literature dealing with water solubility and diffusion in oxide glasses and melts is presented, with an emphasis on simple and commercial compositions and on work during the past decade. Several methods for determination of water solubilities and diffusivities are discussed. Experimental results are presented for silicate, borate, and germanate glasses and melts. Water diffusivities always increase with increasing temperature and modifier oxide content in these melts. Variations in water solubility and diffusivity with alkali and alkaline earth identity for otherwise identical compositions are small, while variations with the identity of the glass‐forming oxide are large. Water solubility increases with increasing modifier oxide content in alkali silicate melts, but decreases with increasing modifier oxide content in alkali borate and germanate melts.

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