Pattern transition and sluggish cracking of colloidal droplet deposition with polymer additives

作     者：ZHANG YongJian LIU ZhengTang ZANG DuYang QIAN YiMeng LIN KeJun 

作者机构：State Key Laboratory of Solidification ProcessingSchool of Materials Science and EngineeringNorthwestern Polytechnical University Key Laboratory of Space Applied Physics and Chemistry(Ministry of Education)School of ScienceNorthwestern Polytechnical University 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2013年第56卷第9期

页      面：1712-1718页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (Grant No.51103117) Shaanxi Provincial Natural Science Foundation (Grant No.2012JQ1016) NPU Foundation for Fundamental Research (Grant Nos.JCY20130147 and JC201125) Specialized Research Fund for the Doctoral Program of Higher Education (Grant No.20126102120058) the Research Fund of the State Key Laboratory of Solidification Processing in NWPU (Grant No.SKLSP201217) 

主　　题：sessile droplet drying crack pattern coffee effect 

摘      要：Drying of colloidal droplets often develops versatile *** study the drying deposition of both colloidal droplets containing silica nanoparticles and the silica colloidal droplets with polyethylene oxide(PEO) *** focus on the effect of polymer additives on the deposition formation and the cracking dynamics by using in-situ microscope *** PEO additives,a transition from ring-like deposition to uniform deposition is observed,and the cracking dynamics is greatly *** PEO additives enhance the adsorption of particles at the air-water interface,thus forming the network structure at the interface which blocks the outward capillary *** contributes to the uniform ***,the multi-distribution of the aggregates size enhances the non-homogeneity of the drying film and consequently results in multi-nucleation of *** reduces the stress accumulation that drives the crack propagation and may be responsible for the sluggish cracking dynamics.