Emulsion systems are widely applied in agriculture, food, cosmetic, pharmaceutical and biomedical industries. Ultrasound has attracted much attention in emulsion preparation, especially for nanoemulsion, due to its advantages of being eco-friendly, cost-effective and energy-efficient. This review provides an overview for readers to the area of ultrasonic emulsification technology. It briefly introduces and summarizes knowledge of ultrasonic emulsification, including emulsion characteristics, acoustic cavitation, emulsification mechanism, ultrasonic devices and applications. The combination of microfluidics and ultrasound is highlighted with huge advantages in controlling cavitation phenomena and emulsification intensification. A novel scale of dμ_C^0.6/μ_D^0.33−E_V is proposed to be able to compare the energy efficiency of emulsion preparation in different devices.

乳液体系广泛应用于农业、食品、化妆品、制药和生物医学行业。超声因其具有环保、成本效益和节能等优点，在乳液制备，特别是纳米乳液的制备中备受关注。本综述为读者提供了超声乳化技术领域的概述。简要介绍和总结了超声乳化的知识，包括乳化特性、声空化、乳化机理、超声器件及应用。微流控与超声的结合在控制空化现象和乳化强化方面具有巨大优势。dμ _C ^0.6 / μ _D的新尺度^0.33 - E _V被提议能够比较不同装置中乳液制备的能量效率。