1997
DOI: 10.1021/la960441p
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Active Site Nature of Pyrogenic Alumina/Silica and Water Bound to Surfaces

Abstract: The natures of the pyrogenic alumina/silica (AS) surface and water adsorbed on AS were studied by 1H NMR, infrared (IR), dielectric relaxation (DRS), and optical spectroscopies, thermally stimulated depolarization (TSD), and quantum chemical methods. An influence of the alumina content on the AS characteristics is nonlinear and stronger for the boundary of air/adsorbed water/oxide than for the liquid water/oxide interface. The 1H NMR study shows that the AS particles in aqueous suspension can strongly disturb … Show more

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Cited by 57 publications
(49 citation statements)
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“…A similar picture is seen for AS samples (Fig. 14a) possessing significant Brønsted acidity (38,39). Consequently, features of carbosil samples result in correlated changes in the textural and energetic characteristics analyzed with consideration for the heterogeneity of hybrid adsorbents.…”
Section: Fig 13 Nitrogen Adsorption Energy Distributions For Cs-isupporting
confidence: 65%
“…A similar picture is seen for AS samples (Fig. 14a) possessing significant Brønsted acidity (38,39). Consequently, features of carbosil samples result in correlated changes in the textural and energetic characteristics analyzed with consideration for the heterogeneity of hybrid adsorbents.…”
Section: Fig 13 Nitrogen Adsorption Energy Distributions For Cs-isupporting
confidence: 65%
“…For common edge Ti|(O(H)) 2 |M (M Å served in the experiments described in Section 1 above. Ti, Si), one bond is 30% larger ( r M 1 OM 2 ) than ordinary The MM calculations give only qualitative results of the Ti{O. Analogous behavior was observed for SA (86), but geometry relaxation for tiny oxide particles. For more detail in the case of common hydrated edge Ti|(O(H)) 2 |Al study of the spatial and electronic structures of the oxide r TiO is close to the ordinary bond length (Table 7).…”
Section: Structures Of Titania and Stmentioning
confidence: 82%
“…This process causes an increase of the interaction between adsorbed water on oxide, e.g., on titania or SA ( Tables 7 and 9 ) , is higher than for molecular adsorption except adsorption on origi-and ST interfaces and leads to increasing the possibility of water molecule localization in these regions. Therefore, high nal silica ( 86,89 ) . The dissociative adsorption of water is the most probably at the phase boundary of mixed ox-titania and ST polarization as well as high charging surfaces increase the influence of the oxide surfaces on the interfacial ides, i.e., if M ( 1 ) x M ( 2 ) in [1] .…”
Section: Structures Of Titania and Stmentioning
confidence: 99%
“…Our measurements were undertaken using the 1 H NMR spectral technique in conjunction with a method based on the freezing-out of a liquid phase (Turov and Barvinchenko 1997;Turov and Leboda 1999;Gun'ko et al 1995Gun'ko et al , 1997. This technique enables the measurement of the concentrations of water adsorbed on the surface and allows the calculation of the values of the free surface energy of the adsorbent at the adsorbent/water interface.…”
Section: Introductionmentioning
confidence: 99%