Adsorption of Water on Well-Characterized Solid Surfaces

Zettlemoyer, A. C.; Micale, F. J.; Klier, K.

doi:10.1007/978-1-4757-6961-6_5

Cited by 32 publications

(27 citation statements)

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“…These different orientations may influence the water properties on the surface (Vogler, 1998) and control the thickness of the water film (Clifford, 1975). The first three molecular water layers adsorbed on a surface develop stronger hydrogen bonds than liquid water and are to some extent ice-like (Zettlemoyer et al, 1975). With increasing water content several water layers build-up and the properties of the adsorbed water approach those of free water (Zettlemoyer et al, 1975;Schreiber et al, 2001;Gruenberg et al, 2004).…”

Section: Effect Of Drying Temperature On Wettabilitymentioning

confidence: 99%

“…Point I represents the state of the samples with high water contents, where all samples would show complete wettability. A water film of approximately 4 complete water layers is present on the particle surface, thus, leading to good wettability, as the adsorbed water shows properties of free water and controls the surface properties (Clifford, 1975;Zettlemoyer et al, 1975;Vogler, 1998). The difference in surface wettability is determined by the number of outward orientated hydrophilic functional groups, as suggested by e.g.…”

Section: Effect Of Drying Temperature On Wettabilitymentioning

confidence: 99%

“…This water film reduces the surface free energy and, therefore, the wettability of the soil (Derjaguin and Churaev, 1986;Vogler, 1998). Above a certain water content, the properties of the particle surface are overbalanced by the properties of the water film, which become more and more similar to those of free water (Clifford, 1975;Zettlemoyer et al, 1975;Goebel et al, 2004). These studies show that the water content alone is not the sole determinant for water repellency expression in soils prone to repellency.…”

Section: Introductionmentioning

confidence: 99%

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Development of soil water repellency in the course of isothermal drying and upon pH changes in two urban soils

Bayer

Schaumann

2007

Hydrological Processes

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Abstract:The potential influence of pH on water repellency in soils has already been mentioned in some studies, but no clear correlation between these parameters has been found to date. In addition, although correlations of water content and water repellency have been found in numerous studies, the influence of drying and subsequent storage conditions on water repellency are still unclear. In this study, a series of samples showing water repellent and wettable conditions respectively at field moist states from two urban locations were compared regarding two main aspects: (i) the influence of artificial pH-changes on their wetting behaviour and (ii) sample wettability changes during drying for different drying temperatures. The assumption made in a study by Hurraß and Schaumann (2006) on the same sample site, that differences in wettability of closely neighboured samples from one sample location can be interrelated with differences in pH, was confirmed. However, in contrast to the assumption that rising pH will improve the wettability and decreasing pH will intensify water repellency, we found a maximum in water repellency at a pH above the initial pH. The results from drying samples at different temperatures confirmed the dependence of water repellency development on the drying temperature. Additionally, we could confirm the conclusion from previous studies that the water content alone cannot explain the water content-WDPT (water drop penetration time) relationship. The results from drying and pH changes show that some location specific factors, like the number of pH active functional groups, may be relevant for sample wettability. As additional mechanism, which may be partly antagonistic to the influence of the water content, we assume temperature-dependent conformational changes in SOM (Soil Organic Matter). It seems that aspects of these conformational changes may additionally be governed by pH in one of our two locations.

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Section: Effect Of Drying Temperature On Wettabilitymentioning

confidence: 99%

Section: Effect Of Drying Temperature On Wettabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of soil water repellency in the course of isothermal drying and upon pH changes in two urban soils

Bayer

Schaumann

2007

Hydrological Processes

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“…The structure of adsorbed water on the surface and in the pores of various types of colloidal silicas has an long history of investigation [1,2] and has been studied extensively in various laboratories using IR and NIR spectroscopy [2][3][4], NMR [5,6], ESR [7,8], dielectric measurement [9,10], and neutron diffraction [11]. However, the structure of adsorbed water proposed by these studies is still not quite clear enough to give a picture of the interface structure of adsorbed molecules.…”

Section: Introductionmentioning

confidence: 99%

The structure of water and methanol adsorbed on silica gel by FT-NIR spectroscopy

Yamauchi

Kondo

1988

Colloid & Polymer Sci

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The NIR adsorption spectra were analyzed quantitatively on the fundamental, combination and first overtone region of OH vibrations of silanol groups, water and methanol adsorbed on mesoporous silica gels. Adsorbed methanol constitutes first layer of about 3 molecules/ran -2 and second layer, the structure of which is similar to that of bulk methanolliquid. Adsorbed water consists of a first layer of about 3 molecules/nrn-2, the second layer of about 9 molecules/nm -2 and the third layer has a structure similar to the that of bulk water. The molecular configuration at the interface is discussed.

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“…Various types of alumina powders are known to react with water vapor to become hydroxylated, [see, e.g., Zettlemoyer et al, 1975;Thiel and Madey, 1987]. It appears that clean alumina surfaces do not react with water vapor at temperatures below -600 K [George et al, 1996].…”

Section: As Can Be Seen Inmentioning

confidence: 99%

The reaction of ClONO₂ with HCl on aluminum oxide

Molina

Zhang

et al. 1997

Geophysical Research Letters

112

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Abstract. The chlorine activation reaction C1ONO2 + HC1 • HNO3 + C12 was investigated in the laboratory on hydroxylated a-alumina surfaces under reactant partial pressure, humidity, and temperature conditions coveting those which are encountered at mid-latitudes in the lower stratosphere. The measured reaction probability is T ~ 0.02. This result has implications with regard to the stratospheric impact of launch vehicles utilizing solid-fuel rocket motors (SRMs), such as the Space Shuttle. The exhaust from SRMs consists of alumina particles and of HC1 and other vapors. The reaction probability measured in this work suggests that the ozone depletion potential of SRMs may be higher than that predicted on the basis of the chlorine emissions alone, especially at mid-latitudes in the lower stratosphere, where catalytic chlorine activation by background sulfuric acid aerosols is very inefficient. The reaction probability on Pyrex glass was found to be similar to that on a-alumina.The reaction mechanism appears to be determined by the water layers adsorbed on the surface, rather than by the detailed nature of the refractory surface itself.

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Adsorption of Water on Well-Characterized Solid Surfaces

Cited by 32 publications

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Development of soil water repellency in the course of isothermal drying and upon pH changes in two urban soils

Development of soil water repellency in the course of isothermal drying and upon pH changes in two urban soils

The structure of water and methanol adsorbed on silica gel by FT-NIR spectroscopy

The reaction of ClONO₂ with HCl on aluminum oxide

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Adsorption of Water on Well-Characterized Solid Surfaces

Cited by 32 publications

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Development of soil water repellency in the course of isothermal drying and upon pH changes in two urban soils

Development of soil water repellency in the course of isothermal drying and upon pH changes in two urban soils

The structure of water and methanol adsorbed on silica gel by FT-NIR spectroscopy

The reaction of ClONO2 with HCl on aluminum oxide

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The reaction of ClONO₂ with HCl on aluminum oxide