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Silica-coated magnetite (Mag-Sil) was prepared by the co-precipitation method using sodium metasilicate under an inert atmosphere and a fine pH control. Cetyltrimethylammonium bromide (CTAB) was adsorbed onto Mag-Sil aiming at decreasing the natural hydrophilicity of the silica surface, allowing the study of the hydrophobic interaction with sodium dodecylbenzenesulfonate (SDBS) to be carried out....