Comparison of different methods to measure contact angles of soil colloids

Shang, Jianying; Flury, Markus; Harsh, James B.; Zollars, Richard L.

doi:10.1016/j.jcis.2008.09.039

Cited by 204 publications

(127 citation statements)

References 48 publications

(77 reference statements)

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“…Similarly to Shang et al [9] in their study of porous materials, the initial ACA was considered the most representative measure of wettability. The initial ACA was taken from the first stable frame from the movie (approximately 50 ms after contact with the substrate) as the contact angle hysteresis due to volume loss is least likely to occur at this stage.…”

Section: Apparent Contact Angle (Aca) Measurementmentioning

confidence: 99%

Effect of particle size on the measurement of the apparent contact angle in sand of varying wettability under air-dried conditions

2016

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Abstract. Changes in the wettability of soil are known to affect several processes such as infiltration and the shear strength of soil. In this study, the wettability of a medium to fine sand was chemically modified by using different concentrations of dimethyldichlorosilane (DMDCS). The sessile drop method (SDM) was used for the assessment of wettability of hydrophobised Leighton Buzzard Sand (LBS). The results demonstrate that beyond a concentration of 2 g per kg of LBS, the finer fraction had its apparent contact angle (ACA) increased up to 115° while the maximum ACA attained by the coarser fractions was 100°. At such high concentration of DMDCS, the effect of trapped air, which is known to increase the ACA, was found to be either small or insignificant. The standard deviations of the ACAs agreed well with past studies. The most important factors contributing to the water-repellent behaviour of chemically synthesised sand were attributed to the characteristics of the particles; these include surface area and particle shape.

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Section: Apparent Contact Angle (Aca) Measurementmentioning

confidence: 99%

Effect of particle size on the measurement of the apparent contact angle in sand of varying wettability under air-dried conditions

2016

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“…The Washburn Equation characterizes the vertical rise of the wetting front due to capillary action (Ishiguro and Fujii, 2008;Matthews, 2008;Shang et al, 2008). The height of the wetting front in meters, x, is related to contact angle, θ, as follows:…”

Section: Capillary Rise Experimentsmentioning

confidence: 99%

Effects of four soil surfactants on four soil-water properties in sand and silt loam

Mobbs¹,

Peters²,

Davenport³

et al. 2012

Journal of Soil and Water Conservation

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“…The static sessile drop method is suitable for measuring the contact angle of colloid particles (like synthetic magnetite nanoparticles used in this work), providing that a closely packed layer of particles can be formed (Shang et al, 2008). Using this method, the contact angle of synthetic magnetite in the present work was determined to be 15-25°.…”

Section: Resultsmentioning

confidence: 99%

Interfacial properties of natural magnetite particles compared with their synthetic analogue

Potapova

Yang

Westerstrand

et al. 2012

Minerals Engineering

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a b s t r a c tUnderstanding of the interactions between iron oxides and flotation reagents is important both for flotation and agglomeration of iron ore. Model systems comprising synthetic iron oxides and pure chemical reagents are commonly applied in experimental work in order to obtain high quality data and to ease the interpretation of the empirical data. Whether the results obtained using model systems are valid for iron ore minerals and commercial reagents is a question seldom addressed in the literature. It is shown in this work that previously reported results obtained from a model system, concerning adsorption of a carboxylate surfactant and sodium metasilicate onto synthetic magnetite nanoparticles, as obtained by in situ ATR-FTIR spectroscopy and contact angle measurements, are applicable to adsorption of flotation reagents on magnetite concentrate. Additionally, the problem of restoring magnetite wetting after flotation is addressed since good wetting of a magnetite concentrate is required to produce iron ore pellets by wet agglomeration. The results from the present work indicate that the wettability of both synthetic magnetite coated with surfactant and magnetite concentrate after flotation can be improved by adsorbing a hydrophilizing agent such as silicate or polyacrylate.

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Comparison of different methods to measure contact angles of soil colloids

Cited by 204 publications

References 48 publications

Effect of particle size on the measurement of the apparent contact angle in sand of varying wettability under air-dried conditions

Effect of particle size on the measurement of the apparent contact angle in sand of varying wettability under air-dried conditions

Effects of four soil surfactants on four soil-water properties in sand and silt loam

Interfacial properties of natural magnetite particles compared with their synthetic analogue

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