Effect of substrate elasticity on evaporation kinetics and evaporative deposition of aqueous polystyrene nanoparticles droplets  

作　　者：Ying-Song Yu Yi-Qi Zhu XianFu Huang Jin-Zhi Zhou An Zhou 

机构地区：[1]Department of Mechanics,School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China [2]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2020年第11期72-79,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11572114,and 11702299);the Chinese Academy of Sciences Strategic Priority Research Program(Grant No.XDB22040401);PetroChina Innovation Foundation。

摘　　要：Evaporation of aqueous polystyrene(PS)nanoparticles droplets on silicon and polydimethylsiloxane(PDMS)surfaces was studied.Experimental results showed that softer PDMS surfaces yielded a longer constant contact radius(CCR)stage,which could be ascribed to surface deformation of PDMS induced by the vertical component of liquid-vapor interfacial tension.Ringlike depositions of nanoparticles with different crack patterns were found on both silicon and PDMS surfaces.In-situ observation of crack formation showed that nanoparticle movement on the silicon surface was impeded,resulting in radial cracks with periodic distribution.In contrast,nanoparticles were shown to move easily on the PDMS surface.This observation indicated the difference in crack patterns on surfaces could be attributed to the friction force between nanoparticles and the substrate.A large friction force between nanoparticles and the substrate prevented cracks from moving,resulting in a radial crack pattern with periodic distribution,while a small friction force produced multiple large cracks.

关 键 词：DROPLET EVAPORATION nanoparticle constant contact radius stage crack 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业] TB383.1[一般工业技术—材料科学与工程]