The fabrication of PCE is mainly categorized into two approaches according to the amount of mechanical energy required: high-energy emulsification method and low-energy emulsification method. High-energy emulsification method which needs intense energy to disrupt the dispersed phase into droplets is generally achieved by high shear-force stirring, high-pressure homogenizers (HPH), microfluidizer or ultrasonic generators. In contrast, for low-energy method.