Spontaneous Formation of Structures with Micro- and Nano-Scopic Periodic Ripple Patterns

被引:0
|
作者
Shastri, Vijayendra [1 ]
Talukder, Santanu [2 ]
Roy, Kaustav [1 ]
Kumar, Praveen [3 ]
Pratap, Rudra [1 ]
机构
[1] Indian Inst Sci, Ctr Nanosci & Engn, Bangalore 560012, Karnataka, India
[2] Indian Inst Sci Educ & Res, Dept Elect Engn & Comp Sci, Bhopal 462066, India
[3] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India
来源
ACS OMEGA | 2022年 / 7卷 / 14期
关键词
LIQUID; GALLIUM;
D O I
10.1021/acsomega.2c0036412111ACS
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report the first study on the formation of structures with micro- and nano-scopic periodic surface patterns created by the spontaneous flow of liquid metal over thin metallic solid films. Minute details of the flow of liquid gallium over gold are captured in situ at very high magnifications using a scanning electron microscope, and a series of experiments and microstructural characterization are performed to understand the underlying principles of the liquid flow and the pattern formation. This phenomenon is solely driven by wetting, with little influence of gravity, and is aided by a tenacious semi-solidus envelope of the intermetallic compound formed due to the reaction between the liquid metal and the metallic substrate. This complex flow creates highly periodic patterns with features ranging from hundreds of nanometers to tens of micrometers, which can be tuned a priori. We propose a model capturing the essential mechanics of the ripple formation and apply it to simulate the formation of a single ripple, along with its essential asymmetry, that forms the basis for generating the observed patterns.
引用
收藏
页码:12111 / 12119
页数:9
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