1. Wicking Enhancement in Three-Dimensional Hierarchical Nanostructures
- Author
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Tiegang Fang, Zhiting Wang, Abhijeet Bagal, Chih-Hao Chang, Junjie Zhao, Erinn C. Dandley, Gregory N. Parsons, and Christopher J. Oldham
- Subjects
Length scale ,Work (thermodynamics) ,Nanostructure ,Materials science ,Capillary action ,Nanowire ,Nanotechnology ,02 engineering and technology ,Surfaces and Interfaces ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Interference lithography ,Electrochemistry ,Surface roughness ,General Materials Science ,0210 nano-technology ,Absorption (electromagnetic radiation) ,Spectroscopy - Abstract
Wicking, the absorption of liquid into narrow spaces without the assistance of external forces, has drawn much attention due to its potential applications in many engineering fields. Increasing surface roughness using micro/nanostructures can improve capillary action to enhance wicking. However, reducing the structure length scale can also result in significant viscous forces to impede wicking. In this work, we demonstrate enhanced wicking dynamics by using nanostructures with three-dimensional (3D) hierarchical features to increase the surface area while mitigating the obstruction of liquid flow. The proposed structures were engineered using a combination of interference lithography and hydrothermal synthesis of ZnO nanowires, where structures at two length scales were independently designed to control wicking behavior. The fabricated hierarchical 3D structures were tested for water and ethanol wicking properties, demonstrating improved wicking dynamics with intermediate nanowire lengths. The experimental data agree with the derived fluid model based on the balance of capillary and vicious forces. The hierarchical wicking structures can be potentially used in applications in water harvesting surfaces, microfluidics, and integrated heat exchangers.
- Published
- 2016