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5325173 
Journal Article 
Characterization of wettability alteration of calcite, quartz and kaolinite: Surface energy analysis 
Tabrizy, VA; Denoyel, R; Hamouda, AA 
2011 
Yes 
Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757 
384 
1-3 
98-108 
WOS:000293035000015 
The paper addresses wettability alteration of calcite, quartz and kaolinite powders, with stearic acid (SA), N,N-dimethyldodecylamine (NN-DMDA) and asphaltene as oil soluble additives. It is a challenge to convert silicate based mineral surfaces from strongly water-wet to more oil-wet. Thermogravimetric analysis (TGA) of the modified powders is used to quantify the monolayer adsorption and is suggesting the possible molecular orientation on the mineral surfaces. Characterization of the mineral surface hydrophilicity/hydrophobicity due to modification is determined by the enthalpy of the water vapor adsorption isotherm. From the quantity and the affinity to water vapor adsorption, a new wettability index is suggested. The enthalpy of water adsorption relative to liquefaction enthalpy shows that stearic acid and asphaltene deeply modify the calcite toward more oil-wet for treated humidified surfaces. It is interesting to observe that although the presence of a water film on quartz and kaolinite surfaces, enhance the adsorption of N,N-dimethyldodecylamine (NN-DMDA), does not eliminate but reduces the asphaltene adsorption. (C) 2011 Elsevier B.V. All rights reserved. 
Wettability; Calcite; Quartz; Kaolinite; Asphaltene; Polar components; TGA; Water adsorption isotherm; Water adsorption enthalpy; Surface energy