Communications in Theoretical Physics ›› 2021, Vol. 73 ›› Issue (4): 047601. doi: 10.1088/1572-9494/abda21

• Topical Review: Statistical Physics, Soft Matter and Biophysics • Previous Articles    

Deposition pattern of drying droplets

Xiuyuan Yang1,2,Zechao Jiang1,2,Peihan Lyu1,2,Zhaoyu Ding1,2,Xingkun Man1,2,()   

  1. 1Center of Soft Matter Physics and its Applications, Beihang University, Beijing 100191, China
    2School of Physics, Beihang University, Beijing 100191, China
  • Received: 2020-12-11 Revised: 2021-01-05 Accepted: 2021-01-09 Published: 2021-04-01
  • Contact: Xingkun Man E-mail:manxk@buaa.edu.cn

Abstract:

The drying of liquid droplets is a common daily life phenomenon that has long held a special interest in scientific research. When the droplet includes nonvolatile solutes, the evaporation of the solvent induces rich deposition patterns of solutes on the substrate. Understanding the formation mechanism of these patterns has important ramifications for technical applications, ranging from coating to inkjet printing to disease detection. This topical review addresses the development of physical understanding of tailoring the specific ring-like deposition patterns of drying droplets. We start with a brief introduction of the experimental techniques that are developed to control these patterns of sessile droplets. We then summarize the development of the corresponding theory. Particular attention herein is focused on advances and issues related to applying the Onsager variational principle (OVP) theory to the study of the deposition patterns of drying droplets. The main obstacle to conventional theory is the requirement of complex numerical solutions, but fortunately there has been recent groundbreaking progress due to the OVP theory. The advantage of the OVP theory is that it can be used as an approximation tool to reduce the high-order conventional hydrodynamic equations to first-order evolution equations, facilitating the analysis of soft matter dynamic problems. As such, OVP theory is now well poised to become a theory of choice for predicting deposition patterns of drying droplets.

Key words: drying droplet, deposition pattern, Onsager variational principle