Volume 25, Issue 2 (Summer 2021)                   JWSS 2021, 25(2): 63-75 | Back to browse issues page

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Mousavi Zadeh Mojarad R, Tabatabaei S H, Nourmahnad N. Comparison Methods of Determining the Degree of Hydrophobicity Based on the Measurement of Soil-Water Contact Angle. JWSS. 2021; 25 (2) :63-75
URL: http://jstnar.iut.ac.ir/article-1-3875-en.html
1. Department of Water Engineering, Faculty of Agriculture, Shahrekord University, Chaharmahal-Va-Bakhtiari, Iran. , rey.mousavi@gmail.com
Abstract:   (219 Views)
The contact angle is a numerical index of differentiation between hydrophilic and hydrophobic soils. The objectives of this research are: 1) assessing different methods such as capillary rise, the molarity of ethanol droplet, repellency index, and sessile drop, and 2) Determining the most efficient method in a typical soil with sandy loam texture. In this study, hydrophobic soil was hydrophobized artificially using stearic acid and according to the water drop penetration time classification method. Calculated contact angles of hydrophilic soil with capillary rise method, the molarity of ethanol droplet method, repellency index (two methods of calculation), and sessile drop method were 89.9, 75.41, (57.81), 56.28, and 58.91, respectively. Using the contact angle measuring device, the contact angle of five hydrophobic levels were 58.91, 104.92, 120.48, 129.96, and 173.07, respectively. According to the precession of the device where the operator is capable to control data and processes and there is no limitation in usage, therefore, the sessile drop method is the most suitable method to measure contact angle. The contact angle of the late method and water drop penetration data are positively correlated (R2 = 0.975).
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Type of Study: Research | Subject: Ggeneral
Received: 2019/04/27 | Accepted: 2020/09/27 | Published: 2021/09/1

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