Vereinfachte Methode zur Messung von Oberflächengrößen durch Gasadsorption, 2. Mitteilung

Haul, R.; Dümbgen, G.

doi:10.1002/cite.330350809

Cited by 100 publications

(6 citation statements)

References 4 publications

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“…The corrections to [12] will be positive for some sites (for du > 0, if u~ -f > w > 0 or 0 > u~-f>-w), negative for other sites (if u~-f<-w <0 or 0<ui-f < w). On introducing [12] into [14] errors are introduced which will tend to cancel on carrying out the integration.…”

Section: /3imentioning

confidence: 99%

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The zno/aqueous solution interface. I. Capacity of the double layer

Trimbos

Stein

1980

Journal of Colloid and Interface Science

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At the ZnO/aqueous electrolyte solution interface, three processes occur on changing the pH of the medium: (a) adsorption of H ÷ or OH-; (b) dissolution or precipitation of ZnO; (c) a slow process consuming H + or OH-, A technique is described by which these processes can be separated. When due allowance is made for the slow process and when the influence of changes in solubility is eliminated, the capacity due to adsorption of H ÷ or OH-alone can be calculated: it is significantly smaller than that found by titration, and smaller than that of the diffuse double layer. The Stern capacity is comparable to that found at AgI/aqueous electrolyte solution interfaces near the pzc.

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Section: /3imentioning

confidence: 99%

“…On introducing [12] into [14] errors are introduced which will tend to cancel on carrying out the integration.…”

Section: /3imentioning

confidence: 99%

The zno/aqueous solution interface. I. Capacity of the double layer

Trimbos

Stein

1980

Journal of Colloid and Interface Science

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“…The experiments were carried out in equipment working at isocratic conditions (that is, at a constant temperature and volume) that was used previously to measure the gas solubilities (Schumpe et al (10)). This equipment had a marking so that excess liquid could be evaporated under vacuum to bring down the volume of degassed liquid to the exactly known level so that it could be contacted with the gas.…”

Section: Methodsmentioning

confidence: 99%

“…The density of solids were measured pycnometrically. The surface areas were measured by use of an area meter (Strohlein) which employs a low-temperature nitrogen adsorption technique according to BET method as described by Haul and Dumbgen (9,10). An omnicon Alpha Image Analyzer was employed to measure the particle-size distributions.…”

Section: Methodsmentioning

confidence: 99%

Equilibrium adsorption of carbon dioxide by aqueous slurries of solid particles

Quicker¹,

Li²,

Deckwer³

et al. 1989

J. Chem. Eng. Data

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“…As a result, the particle size distribution, soil mineralogy, total specific surface, and cation exchange capacity were separately determined. The total specific surface area was determined by measuring the amount of physically adsorbed nitrogen according to the Brunauer-Emmett-Teller (BET) method, in combination with the single-point differential method [253,254,255]. The cation exchange capacity for AS and KA was determined by means of silver thiourea methods (for method details, see [256] and for soil C by means of Cu-Triethylentetramin (modified method of Meier and Kahr [257] -see…”

Section: Classification Of Soils Under Testmentioning

confidence: 99%

Mechanical, hydraulic, and dielectric characterisation of fine-grained soils during densification

Schwing¹

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Soil characterisation is of primary interest for several disciplines, including geotechnical and geo-environmental engineering, soil science, and agriculture. An upcoming and promising method for soil characterisation relies on the high-frequency electromagnetic measurement technique which provides the potential to explore and investigate soils. However, successful application of this technique requires a profound understanding of the multi-physical processes arising from interactions between soil as a porous medium and the propagation of electromagnetic waves. This thesis focuses on a coupled experimental investigation of the mechanical, hydraulic, and dielectric characterisation of fine-grained soil during densification.In the framework of this thesis, the following steps have been completed and novel findings have been made:1. Probe designs have been developed, modified and improved to measure the dielectric soil properties in a frequency range from 1 MHz to 3 GHz during shrinkage and compaction. A low-cost in-house-manufactured probe was introduced, which was specifically designed for standardised geotechnical soil shrinkage test. During preliminary investigations, the calibration procedure and performance of these sensors were experimentally and numerically tested. The results showed agreement in the targeted frequency window.2. Compaction and shrinkage tests on fine-grained soils were conducted in combination with dielectric and soil suction measurements. The shrinkage curve and soil water characteristic curve (SWCC) was established and successfully parameterised with physical based models. The complex permittivity was determined in a frequency range from 1 MHz to 3 GHz. The dielectric properties measured during the shrinkage test showed a sudden drop of complex permittivity which could be located in the residual shrinkage zone.3. A theoretical electromagnetic mixture approach was used to model the measured frequency dependent dielectric properties of soils during shrinkage and compaction based on the parameterised shrinkage curve and SWCC. The theoretical results were compared to the dielectric measurements on different fine-grained soils. The comparison ii showed that the real part of permittivity could be well predicted whereas the imaginary part suffered inaccuracies.4. A sensitivity analysis was performed with the theoretical electromagnetic mixture approach in consideration of the shrinkage behaviour and SWCC in order to investigate the influence of soil suction and dry density on the frequency dependent permittivity.The sensitivity analysis showed that the real part of the permittivity near 1 GHz was insensitive to changes in the soil suction and dry density. In the MHz range, the real part of the permittivity was more sensitive to changes in soil suction than it was to dry density. The imaginary part of the permittivity was generally observed to be more sensitive to soil suction over the entire frequency range.

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Vereinfachte Methode zur Messung von Oberflächengrößen durch Gasadsorption, 2. Mitteilung

Cited by 100 publications

References 4 publications

The zno/aqueous solution interface. I. Capacity of the double layer

The zno/aqueous solution interface. I. Capacity of the double layer

Equilibrium adsorption of carbon dioxide by aqueous slurries of solid particles

Mechanical, hydraulic, and dielectric characterisation of fine-grained soils during densification

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