Oil Detachment from Solid Surfaces in Aqueous Surfactant Solutions as a Function of pH

摘要: Effective removal of oil from metal surfaces utilizing aqueous solutions depends on the appropriate selection surfactant(s) and pH conditions. In experiments described in this paper, detachment droplets a solid surface surfactant was studied variation droplet shape, particularly contact angle, time required for were measured. parallel, tests an industrial ultrasonic bath conducted under conditions similar to drop-detachment tests. Consistent trends found both types tests; that is, which detach more quickly correspond greater bath. At high pH, faster (and removal) kinetics observed when oil−water interface negatively charged (per ζ-potential measurements). contrast, at low-pH conditions, solid−liquid positively ch...