SPG membrane emulsification for the preparation of monodispersed micro-emulsions

Monodisperse emulsions were prepared using an in-home Shirasu-porous-glass(SPG) membrane emulsification system.Both the flow velocity of the continuous phase and the emulsification pressure influence the monodisperse properties of each SPG membrane which has a uniform micropore distributions.Increasing flow velocity in the continuous phase improves the emulsion monodispersity and reduces the average size of the emulsions for a constant emulsification pressure.For pressure below a critical pressure,increasing emulsification pressures leds to increases in the average emulsion size,with the emulsion monodispersity almost unchanged for relatively high flow velocities in the continuous phase.Above the critical pressure,the monodispersity became worse.Using an SPG membrane with a 0.9 μm pore size,kerosene was dispersed into water to form a steady emulsion with average drop size of 3.24 μm and a monodispersity factor of 0.56.