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• W2009969042 abstract "Based on contact-angle measurements and the work of adhesion equation, the hydrophobicity of a wide variety of coals was found to decrease with decreasing rank, fixed carbon and total carbon content and with increasing oxygen and hydroxyl content. The estimated hydrophobicity, based on the water-sessile-drop contact angle, is ∼20% for lignite, increases with increasing rank up to a maximum of ∼70% for low (LV) and medium (MV) volatile bituminous coals and then decreases somewhat for anthracite. Using the captive-bubble technique, the calculated hydrophobicity ranges from ∼0% (below HVA bituminous rank) to a maximum of 55% for LV—MV coal. The former estimation is believed to be the more accurate. While the water-sessile-drop contact angle as measured on a polished-coal surface is usually larger than that shown by the captive-bubble method, the two values were found to converge at ∼95% relative humidity. It is proposed that the surface of coal consists of three kinds of sites: strongly hydrophobic, weakly hydrophobic and hydrophilic. The sessile-drop technique measures the total hydrophobic sites whereas the captive-bubble method measures only the more strongly hydrophobic sites. A water film covers the weakly hydrophobic sites preventing their detection by the captive-bubble technique." @default.
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• W2009969042 date "1984-01-01" @default.
• W2009969042 modified "2023-10-18" @default.
• W2009969042 title "Estimating the hydrophobicity of coal" @default.
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• W2009969042 doi "https://doi.org/10.1016/0166-6622(84)80086-4" @default.
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