Phacoemulsification is a process in which two (or more) immiscible liquids are evenly mixed to form a dispersion system under the action of ultrasonic energy, one of which is evenly distributed in the other liquid to form an emulsion.
Ultrasonic emulsification has the following characteristics and advantages
1. High emulsification quality
The average droplet size of emulsion formed by ultrasonic emulsification is small, which can be 0.2 to 2. μ m. The droplet size distribution is narrow, ranging from 0.1 to 10 μ M or more narrow, high concentration, pure emulsion concentration of 30%, plus emulsifier can reach 70%.
2. Emulsification stability
The emulsion formed by ultrasonic emulsification is more stable. An important characteristic of phacoemulsification is that it can produce very stable emulsion without or without emulsifier. Some can be stable for several months to more than half a year, low energy consumption, high production efficiency and low cost.
3. The type of emulsion can be controlled.
Under the condition of some acoustic fields, o/w (oil in water) and w/o (oil in water) emulsion can be prepared by phacoemulsification. However, it is impossible to use mechanical emulsification. Only the nature of emulsifier can control the type of lactic acid. For example, toluene is emulsified in water and can form a type of emulsion under low acoustic intensity. Another type of emulsion may be formed under high acoustic intensity.