Fig. 6From: Oil Contact Angles in a Water-Decane-Silicon Dioxide System: Effects of Surface ChargeNegative charge density distributions inside the cylindrical oil droplets in the x-z plane. a − 1.984 e/nm2. b − 0.992 e/nm2. c − 0.1984 e/nm2. d 0.0 e/nm2. e 0.1984 e/nm2. f 0.992 e/nm2. g 1.984 e/nm2. h 3.968 e/nm2. i 5.952 e/nm2. j 7.936 e/nm2Back to article page