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The surface free energy of soil colloids [electronic resource].

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Zabidi, M. D

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Language: English Summary language: Arabic Description: p.524-534Other title:

الطاقة الحرة السطحية لغرويات الأراضي [Added title page title]

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Journal of the advances in agricultural researches, 2013 v. 18 (3) [electronic resource].

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In: Journal of the Advances in Agricultural Researches 2013.v.18(3)Summary: Water repellency, floatability. hydrophobicity, swelling, wetting processes, water adsorption, and structure of adsorbed water are examples of interactions at interfaces. A property of solids involved in these interactions is the surface free energy (tension). Because surface free energies measurements for soil colloids are scarce it was the purpose of this paper to report values of the surface free energy for soil clay fraction (<2 µm) of Torrifluvents. X-ray diffraction patterns indicated that the clay fractions of the P5 and P9 soil samples (Nile delta, Egypt) were mainly formed of smectite, followed by kaolinite and illites. Chlorite, vermiculite, and mixed layers appeared only in traces. The spreading surface pressures of soil clays were determined using water vapor adsorption isotherms at 28° C and a nonlinear least squares fitting the BET equation to the experimental data. The values: 36.93 and 38.37 mJ. m⁻² were computed for the spread;ng pressures of the two soil-clay samples P5 and P9, respectively. Then, the surface free energies for the soil clays were computed following a recently developed procedure that utilized a formula obtained by combining the Young equation with the general equation of pair interaction. This procedure gave the values 183.76 and 191.45 mJ m⁻² for the surface free energies of the soil clays P5 and P9, respectively.

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Water repellency, floatability. hydrophobicity, swelling, wetting processes, water adsorption, and structure of adsorbed water are examples of interactions at interfaces. A property of solids involved in these interactions is the surface free energy (tension). Because surface free energies measurements for soil colloids are scarce it was the purpose of this paper to report values of the surface free energy for soil clay fraction (<2 µm) of Torrifluvents. X-ray diffraction patterns indicated that the clay fractions of the P5 and P9 soil samples (Nile delta, Egypt) were mainly formed of smectite, followed by kaolinite and illites. Chlorite, vermiculite, and mixed layers appeared only in traces. The spreading surface pressures of soil clays were determined using water vapor adsorption isotherms at 28° C and a nonlinear least squares fitting the BET equation to the experimental data. The values: 36.93 and 38.37 mJ. m⁻² were computed for the spread;ng pressures of the two soil-clay samples P5 and P9, respectively. Then, the surface free energies for the soil clays were computed following a recently developed procedure that utilized a formula obtained by combining the Young equation with the general equation of pair interaction. This procedure gave the values 183.76 and 191.45 mJ m⁻² for the surface free energies of the soil clays P5 and P9, respectively.

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