Roy Priyatanu, Liu Shihao, Dutcher Cari S
Department of Mechanical Engineering, University of Minnesota, Twin Cities, Minneapolis, Minnesota 55455, USA; email:
Department of Chemical Engineering and Materials Science, University of Minnesota, Twin Cities, Minneapolis, Minnesota 55455, USA.
Annu Rev Phys Chem. 2021 Apr 20;72:73-97. doi: 10.1146/annurev-physchem-090419-105522. Epub 2021 Feb 19.
Measurements of droplet phase and interfacial tension (IFT) are important in the fields of atmospheric aerosols and emulsion science. Bulk macroscale property measurements with similar constituents cannot capture the effect of microscopic length scales and highly curved surfaces on the transport characteristics and heterogeneous chemistry typical in these applications. Instead, microscale droplet measurements ensure properties are measured at the relevant length scale. With recent advances in microfluidics, customized multiphase fluid flows can be created in channels for the manipulation and observation of microscale droplets in an enclosed setting without the need for large and expensive control systems. In this review, we discuss the applications of different physical principles at the microscale and corresponding microfluidic approaches for the measurement of droplet phase state, viscosity, and IFT.
液滴相和界面张力（IFT）的测量在大气气溶胶和乳液科学领域中很重要。对具有相似成分的宏观性质进行测量无法捕捉微观长度尺度和高度弯曲表面对这些应用中典型的传输特性和非均相化学的影响。相反，微尺度液滴测量可确保在相关长度尺度上测量性质。随着微流体技术的最新进展，可以在通道中创建定制的多相流体流动，以便在封闭环境中操纵和观察微尺度液滴，而无需大型且昂贵的控制系统。在本综述中，我们讨论了不同物理原理在微尺度上的应用以及用于测量液滴相态、粘度和IFT的相应微流体方法。
