Details
| Original language | English |
|---|---|
| Pages (from-to) | 745-753 |
| Number of pages | 9 |
| Journal | Journal of Plant Nutrition and Soil Science |
| Volume | 169 |
| Issue number | 6 |
| Publication status | Published - Dec 2006 |
Abstract
Wettability of soil affects a wide variety of processes in soils like infiltration, percolation, preferential flow, and surface run-off. Even though efforts have been made to determine contact angles and surface tension or energy of smooth surfaces, the determination on granular materials like soil particles remains unsolved. One objective of this study was to test the consistency of contact angles (CA) measured with the newly modified and easy-to-apply Wilhelmy plate method by using solid particles and liquids with defined variations of surface tension. A second objective was to derive basic physical surface properties for the irregularly shaped and chemically heterogeneous soil particles. Advancing contact angles were determined by using model soils varying in texture from clay to coarse sand to check the impact of grain size on the CA measurements. Varying the solid-surface tension with dichlorodimethlylsilane treatments provided for pure-water wetting stages ranging from wettable to extremely hydrophobic. The surface tensions of the liquids were varied from 72 mN m-1 to 25 mN m-1 by using water or water-ethanol mixtures. The surface tensions of the model soils were determined with the zero degree-contact angle method following Zisman's critical-surface tension concept. Results show that the measured CA varied continuously with the variations of the surface tension of the liquid and the solid phase, respectively. A general interpretation of the results is possible by using the concept of the Equation of State Approach.
Keywords
- Contact angle, Hydrophobic soil, Soil physics, Surface tension, Wilhelmy plate method
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Journal of Plant Nutrition and Soil Science, Vol. 169, No. 6, 12.2006, p. 745-753.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Universality of a surface tension - Contact-angle relation for hydrophobic soils of different texture
AU - Bachmann, Jörg
AU - Arye, Gilboa
AU - Deurer, Markus
AU - Woche, Susanne K.
AU - Horton, Robert
AU - Hartge, Karl Heinz
AU - Chen, Yona
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006/12
Y1 - 2006/12
N2 - Wettability of soil affects a wide variety of processes in soils like infiltration, percolation, preferential flow, and surface run-off. Even though efforts have been made to determine contact angles and surface tension or energy of smooth surfaces, the determination on granular materials like soil particles remains unsolved. One objective of this study was to test the consistency of contact angles (CA) measured with the newly modified and easy-to-apply Wilhelmy plate method by using solid particles and liquids with defined variations of surface tension. A second objective was to derive basic physical surface properties for the irregularly shaped and chemically heterogeneous soil particles. Advancing contact angles were determined by using model soils varying in texture from clay to coarse sand to check the impact of grain size on the CA measurements. Varying the solid-surface tension with dichlorodimethlylsilane treatments provided for pure-water wetting stages ranging from wettable to extremely hydrophobic. The surface tensions of the liquids were varied from 72 mN m-1 to 25 mN m-1 by using water or water-ethanol mixtures. The surface tensions of the model soils were determined with the zero degree-contact angle method following Zisman's critical-surface tension concept. Results show that the measured CA varied continuously with the variations of the surface tension of the liquid and the solid phase, respectively. A general interpretation of the results is possible by using the concept of the Equation of State Approach.
AB - Wettability of soil affects a wide variety of processes in soils like infiltration, percolation, preferential flow, and surface run-off. Even though efforts have been made to determine contact angles and surface tension or energy of smooth surfaces, the determination on granular materials like soil particles remains unsolved. One objective of this study was to test the consistency of contact angles (CA) measured with the newly modified and easy-to-apply Wilhelmy plate method by using solid particles and liquids with defined variations of surface tension. A second objective was to derive basic physical surface properties for the irregularly shaped and chemically heterogeneous soil particles. Advancing contact angles were determined by using model soils varying in texture from clay to coarse sand to check the impact of grain size on the CA measurements. Varying the solid-surface tension with dichlorodimethlylsilane treatments provided for pure-water wetting stages ranging from wettable to extremely hydrophobic. The surface tensions of the liquids were varied from 72 mN m-1 to 25 mN m-1 by using water or water-ethanol mixtures. The surface tensions of the model soils were determined with the zero degree-contact angle method following Zisman's critical-surface tension concept. Results show that the measured CA varied continuously with the variations of the surface tension of the liquid and the solid phase, respectively. A general interpretation of the results is possible by using the concept of the Equation of State Approach.
KW - Contact angle
KW - Hydrophobic soil
KW - Soil physics
KW - Surface tension
KW - Wilhelmy plate method
UR - http://www.scopus.com/inward/record.url?scp=33845762434&partnerID=8YFLogxK
U2 - 10.1002/jpln.200622022
DO - 10.1002/jpln.200622022
M3 - Article
AN - SCOPUS:33845762434
VL - 169
SP - 745
EP - 753
JO - Journal of Plant Nutrition and Soil Science
JF - Journal of Plant Nutrition and Soil Science
SN - 1436-8730
IS - 6
ER -