Changes in density and surface tension of water in silica pores

Takei, Takashi; Mukasa, Kazuo; Kofuji, M.; Fuji, Masayoshi; Watanabe, Tatsuya; Chikazawa, Masatoshi; Kanazawa, Takafumi

doi:10.1007/s003960050542

Cited by 73 publications

(85 citation statements)

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“…In line with this, the decrease in specific surface area by nitrogen adsorption indicates the coverage of the silica surface with the functional groups. These findings are in accordance with the previous studies [48]. It was reported that nitrogen molecules were adsorbed preferentially to silanols and a weak adsorption was observed on organic surfaces compared with bare silica surfaces.…”

Section: Characterization Of the Sorbentsupporting

confidence: 93%

Synthesis of aminopropyl triethoxysilane-functionalized silica and its application in speciation studies of vanadium(IV) and vanadium(V)

Erdem

Shahwan

Çağır

et al. 2011

Chemical Engineering Journal

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a b s t r a c tA solid phase extraction sorbent, aminopropyl triethoxysilane-functionalized silica was prepared and used for vanadium speciation prior to inductively coupled plasma mass spectrometric determination. The necessary sorption parameters such as sorption pH, reaction temperature, sorbent amount and sample volume were optimized. The sorption for V(V) and V(IV) under the optimized conditions was 98% (±1) and was lower than 10%, respectively. The sorption process was investigated both from a kinetic perspective and also in terms of Freundlich, Dubinin-Radushkevich and Langmuir isotherm models to characterize the uptake of vanadate ion by the functionalized silica. Desorption from the sorbent was realized with 0.5 mol L −1 thiourea prepared in 0.2 mol L −1 HCl. Among the possible interfering species tested, Te(IV), Se(IV), Se(VI) and Fe(III) showed interference effects with V(V) signal. The validity of the method was first checked via spike recovery experiments with four different types of water; namely ultra pure, bottled drinking, tap, and sea water for different concentrations of V(V). The percent recovery values changed between 87 and 108 for all water types. The accuracy of the proposed methodology was also checked by analyzing a standard reference material (NIST, SRM 1643e) and a good agreement was found between the determined and the certified value. The proposed methodology has also been shown to be applicable for the separate sorption of V(V) in the absence/presence of V(IV) and for the sorption of both V(IV) and V(V) in waters. The amount of V(IV) can then be determined from the difference.

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Section: Characterization Of the Sorbentsupporting

confidence: 93%

Synthesis of aminopropyl triethoxysilane-functionalized silica and its application in speciation studies of vanadium(IV) and vanadium(V)

Erdem

Shahwan

Çağır

et al. 2011

Chemical Engineering Journal

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“…However, it is likely that thermal expansion / contraction will result in a change of density in the absorbate and the artificial confinement may moderate density changes unpredictably. Since the measurements are taking place below the bulk melting point of the liquids, bulk density information must be obtained from supercooling experiments (Bellissentfunel et al, 1986(Bellissentfunel et al, , 1989Bosio et al, 1983;Takei et al, 2000). Information is also available from studying liquids in pores using SANS (Newport et al, 1988) and from the first diffraction peak using neutron or X-ray diffraction (Liu et al, 2006;Bosio et al, 1981;Dore, 2000;Seyed-Yazdi et al, submitted).…”

Section: Densitymentioning

confidence: 99%

Nuclear magnetic resonance cryoporometry

2008

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Nuclear Magnetic Resonance (NMR) cryoporometry is a technique for non-destructively determining pore size distributions in porous media through the observation of the depressed melting point of a confined liquid. It is suitable for measuring pore diameters in the range 2 nm -1 µm, depending on the absorbate. Whilst NMR cryoporometry is a pertabative measurement, the results are independent of spin interactions at the pore surface and so can offer direct measurements of pore volume as a function of pore diameter. Pore size distributions obtained with NMR cryoporometry have been shown to compare favourably with those from other methods such as gas adsorption, DSC thermoporosimetry, and SANS. The applications of NMR cryoporometry include studies of silica gels, bones, cements, rocks and many other porous materials. It is also possible to adapt the basic experiment to provide structural resolution in spatially dependent pore size distributions, or behavioural information about the confined liquid.

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“…The interaction effects of solid surfaces on adsorbed layers are gradually reduced with an increase in the thickness of the adsorbed layer. The results obtained [46] show that the structure of water is affected up to at least 4 nm from the solid surface. If the thickness of a single adsorbed layer of water is 0.29 nm [52,53], the effects of solid surfaces extend to 11-14 molecular layers in small pores.…”

Section: Effect Of Adsorbed Solvent Layers On the Rheology Of Aqueousmentioning

confidence: 80%

“…Therefore, the bound water content of slurries should be another parameter in describing viscosity. In Takei's work [46] of water in silica pores, the result suggests that physisorbed water molecules are localized on the silica surfaces because of strong interactions with the surface hydroxyl groups. The second adsorbed layer is formed on the first adsorbed layer through the formation of hydrogen bonds, so the structure of the second adsorbed layer is affected by the configuration and orientation of the water molecules in the first adsorbed layer.…”

Section: Effect Of Adsorbed Solvent Layers On the Rheology Of Aqueousmentioning

confidence: 99%

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Rheological properties of aqueous nanometric alumina suspensions

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Changes in density and surface tension of water in silica pores

Cited by 73 publications

References 1 publication

Synthesis of aminopropyl triethoxysilane-functionalized silica and its application in speciation studies of vanadium(IV) and vanadium(V)

Synthesis of aminopropyl triethoxysilane-functionalized silica and its application in speciation studies of vanadium(IV) and vanadium(V)

Nuclear magnetic resonance cryoporometry

Rheological properties of aqueous nanometric alumina suspensions

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