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Formation of Regular Wormlike Patterns by Dewetting Aqueous Dispersions of Halloysite Nanotubes
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2020-03-31 , DOI: 10.1021/acs.jpcc.0c01424
Hongzhong Liu 1 , Xiang Cao 1 , Xiaohan Yang 1 , Mingxian Liu 1, 2 , Yuri Lvov 2
Affiliation  

The wormlike micropatterns were elaborated by drying halloysite clay nanotube dispersions placed between two horizontal glass slides. This 0.1–0.2 mm thick confined space induces the fractal self-assembly of charged nanotubes governed by water evaporation and flow directions. The wriggled stripe clay patterns were formed both on the upper and bottom glass surfaces with width, height, and stripe spacing controlled by halloysite concentrations, space height, drying time, and temperature in the range of 20–80 °C. After separating the slides, the pattern was divided into two identical fractal clay surfaces. Birefringence in the stripes demonstrated the nanotube oriented domains with 50–100 μm length. A model for the pattern formation is proposed relating this phenomenon with the colloidal self-assembly and coffee-ring formation mechanisms. These solid micropatterns can be transferred on polydimethylsiloxane stamps for further polymer imprinting. The technique is simple and scalable and uses water-based natural clay materials, allowing for green chemistry surface processing.

中文翻译:

通过去水埃洛石纳米管的水分散体形成规则的蠕虫样图案。

通过干燥放置在两个水平载玻片之间的埃洛石粘土纳米管分散液来细化蠕虫状微图案。0.1-0.2毫米厚的受限空间可引发带电纳米管的分形自组装,该分形自组装受水的蒸发和流向控制。在上下玻璃表面上都形成了扭曲的条纹粘土图案,其宽度,高度和条纹间距受埃洛石浓度,空间高度,干燥时间和温度在20–80°C范围内的控制。分离载玻片后,将图案分成两个相同的分形粘土表面。条纹中的双折射表明纳米管取向的畴长为50–100μm。提出了一种模式形成模型,将这种现象与胶体自组装和咖啡环形成机理联系起来。这些固体微图案可以转移到聚二甲基硅氧烷印模上,以进一步进行聚合物压印。该技术简单且可扩展,并使用水基天然粘土材料,可进行绿色化学表面处理。
更新日期:2020-03-31
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