黏弹性流体在微粒被动操控技术中的应用

Application of Viscoelastic Fluid in Passive Particle Manipulation Technologies

因能实现微米尺度粒子的精确操控,微流控技术已被广泛运用于医学、制药、生物和化学等领域,其中无需外场作用的被动操控技术由于其简单性和自主性更是成为研究热点。与其他被动操控技术相比,黏弹性聚焦技术更易实现微粒的三维聚焦且能操控微粒的尺度跨度大、流体流量范围广。因此,本文综述了黏弹性流体在微粒被动操控应用中的最新研究进展。首先,介绍了微粒在不同结构流道内的黏弹性流体中进行迁移的受力机理,进一步详细阐述了黏弹性聚焦、黏弹性分选、黏弹性混合以及其他黏弹性微粒操控应用研究进展,最后对研究黏弹性流体流动特性和在其内微粒迁移运动规律的数值模拟方法进行了介绍,并在分析现有问题的基础上对黏弹性微流控技术未来的发展作出了展望。

Microfluidics, which can precisely manipulate micron-sized particles, has been widely used in medical, pharmaceutical, biological and chemical fields. The passive manipulation technologies without external field effect have become a research hotspot because of their simplicity and autonomy. Compared with other passive manipulation technologies, viscoelastic focusing technology makes it easier to achieve three-dimensional focusing of particles, and can manipulate particles with a large-scale span and a wide range of fluid flow. Therefore, this paper reviews the latest research on viscoelastic fluids in particle passive manipulation applications. Firstly, the force mechanism of particles in viscoelastic fluid in different microchannel structure is introduced. Then, the research progress of viscoelastic focusing, sorting, mixing and other viscoelastic particle manipulation applications is further elaborated. Finally, the numerical simulation method for studying the flow characteristics of viscoelastic fluids and the movement law of particles in it are introduced, and some prospects for the future development of viscoelastic microfluidics are made based on the analysis of existing problems.