Behaviour of pure water and water mixture with benzene or chloroform adsorbed onto ordered mesoporous silicas

• Authors: Vladimir Gun’ko , Vladimir Turov , Alexander Turov , Vladimir Zarko , Vasiliy Gerda , Victor Yanishpolskii , Inna Berezovska , Valentin Tertykh
• Languages of publication: EN

Abstracts

EN

Structural characteristics of synthesized ordered mesoporous silicas MCM-41, MCM-48 and SBA-15 were studied using XRD, nitrogen adsorption and FTIR methods. Pure water and mixtures with water/benzene and water/chloroform-d adsorbed onto silicas were studied by 1H NMR spectroscopy with layer-by-layer freezing-out of bulk and interfacial liquids. Concentrated aqueous suspensions of MCM-48 and SBA-15 were studied by thermally stimulated depolarization current (TSDC) method. Benzene and chloroform-d can displace a portion of water to broad pores from the pore walls and from narrower pores, especially in the case of a large excess of an organic solvent. This process is accompanied by diminution of both interaction energy of water with an adsorbent surface and freezing temperature depression of adsorbed water. The effect of nonpolar benzene on pore water is much stronger than that of weakly polar chloroform-d. Modifications of the Gibbs-Thomson relation to describe the freezing point depression of mixtures of immiscible liquids confined in pores allow us to determine distribution functions of sizes of structures with unfrozen pore water and benzene. [...]

Keywords

EN

MCM-41; MCM-48; SBA-15; XRD; FTIR; nitrogen adsorption; structural characteristics; pore liquid; 1H NMR; TSDC; cryoporometry; relaxometry

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2007
• Volume: 5
• Issue: 2
• Pages: 420-454

Dates

published

1 - 6 - 2007

online

26 - 1 - 2007

Contributors

author

Vladimir Gun’ko

• Institute of Surface Chemistry, 03164, Kiev, Ukraine

author

Vladimir Turov

• Institute of Surface Chemistry, 03164, Kiev, Ukraine

author

Alexander Turov

• Taras Shevchenko University, Kiev, 01030, Ukraine

author

Vladimir Zarko

• Institute of Surface Chemistry, 03164, Kiev, Ukraine

author

Vasiliy Gerda

• Taras Shevchenko University, Kiev, 01030, Ukraine

author

Victor Yanishpolskii

• Institute of Surface Chemistry, 03164, Kiev, Ukraine

author

Inna Berezovska

• Institute of Surface Chemistry, 03164, Kiev, Ukraine

author

Valentin Tertykh

• Institute of Surface Chemistry, 03164, Kiev, Ukraine

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Identifiers

DOI

10.2478/s11532-007-0010-3