Role of particle shape anisotropy on crack formation in drying of colloidal suspension

被引：54

作者：

Dugyala, Venkateshwar Rao ^{[1
]}

Lama, Hisay ^{[2
]}

Satapathy, Dillip K. ^{[2
]}

Basavaraj, Madivala G. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Chem Engn, Polymer Engn & Colloid Sci Lab, Madras 600036, Tamil Nadu, India

[2] Indian Inst Technol, Dept Phys, Soft Mat Lab, Madras 600036, Tamil Nadu, India

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

关键词：

COFFEE-RING; PATTERNS; EVAPORATION; DROPS; FLOW;

D O I：

10.1038/srep30708

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Cracks in a colloidal film formed by evaporation induced drying can be controlled by changing drying conditions. We show, for the first time that the crack morphologies in colloidal films are dependent on shape of constituting particles apart from the microstructure and particle assembly. In order to investigate the particle shape effect on crack patterns, monodispered spherical and ellipsoidal particles are used in sessile drop experiments. On observing the dried sessile drop we found cracks along the radial direction for spherical particle dispersions and circular crack patterns for ellipsoidal particle dispersions. The change in crack pattern is a result of self assembly of shape anisotropic particles and their ordering. The ordering of particles dictate the crack direction and the cracks follow the path of least resistance to release the excess stress stored in the particle film. Ellipsoids having different aspect ratio (similar to 3 to 7) are used and circular crack patterns are repeatedly observed in all experiments.

引用

页数：7

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