润湿
材料科学
蒸发
溶剂
化学工程
异丙醇
胶体
复合材料
纳米技术
化学
有机化学
热力学
物理
工程类
作者
Rajashekhar Pujar,Ankush Kumar,K. D. M. Rao,Supti Sadhukhan,Tapati Dutta,Sujata Tarafdar,Giridhar U. Kulkarni
出处
期刊:Langmuir
[American Chemical Society]
日期:2019-11-11
卷期号:35 (49): 16130-16135
被引量:7
标识
DOI:10.1021/acs.langmuir.9b02442
摘要
Desiccation of a colloidal layer produces crack patterns because of stress arising out of solvent evaporation. Associated with it is the rearrangement of particles, while adhesion to the substrate resists such movements. The nature of solvent, which is often overlooked, plays a key role in the process as it dictates evaporation and wetting properties of the colloidal film. Herein, we study the crack formation process by using a mixture of solvents, water, and isopropyl alcohol (IPA). Among the various ratios, a water/IPA mixture (15:85 by volume) close to the azeotropic composition possesses unusual evaporation and wetting properties, leading to narrower cracks with widths down to ∼162 nm, uncommon among the known crackle patterns. The dense and narrow crack patterns have been used as sacrificial templates to obtain metal meshes on transparent substrates for optoelectronic applications.
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