Journal ArticleDOI
Facile creation of hierarchical PDMS microstructures with extreme underwater superoleophobicity for anti-oil application in microfluidic channels
Dong Wu,Sizhu Wu,Qi-Dai Chen,Shuai Zhao,Hao Zhang,Jian Jiao,Jeffrey A. Piersol,Jian-Nan Wang,Hong-Bo Sun,Lei Jiang +9 more
TLDR
A significant improvement of oil contact angle is observed by introducing a radical silanol group on a flat PDMS surface through oxygen plasma pretreatment and it is believed that the superoleophobic surfaces will power broad applications in oil microdroplet transportation, anti-oil channels and droplet microfluidic systems.Abstract:
Composition modification and surface microstructures have been widely utilized in interface science to improve the surface performance. In this paper, we observed a significant improvement of oil contact angle (CA) from 66 ± 2° to 120 ± 4° by introducing a radical silanol group on a flat PDMS surface through oxygen plasma pretreatment. By combining surface microstructures and plasma modification, we produced three kinds of superoleophobic surfaces: 20 μm pitch micropillar arrays, 2.5 μm pitch micropillar arrays and gecko foot-like hierarchical microstructures. Among them, the hierarchical surface with high surface roughness showed extreme underwater superoleophobicity, which featured ultrahigh CA (175 ± 3°) and ultrasmall sliding angle (<1°). Quantitative measurements demonstrated that these superoleophobic surfaces exhibited distinct adhesive behaviors, by which they were interpreted as Wenzel's, Cassie's and the Lotus state, respectively. A microfluidic channel with superoleophobic microstructures was further created by novel curve-assisted imprint lithography, and the characterization based on anti-oil contamination applications was carried out and discussed. We believe that the superoleophobic surfaces will power broad applications in oil microdroplet transportation, anti-oil channels and droplet microfluidic systems.read more
Citations
More filters
Journal ArticleDOI
Emerging Droplet Microfluidics
TL;DR: The purpose of this review is to convey the fundamentals of droplet microfluidics, a critical analysis on its current status and challenges, and opinions on its future development.
Journal ArticleDOI
Bio-inspired superoleophobic and smart materials: Design, fabrication, and application
TL;DR: In this article, the authors focus on recent research progress in the design, fabrication, and application of bio-inspired superoleophobic and smart surfaces, including super-oleophobic-superhydrophobic surfaces, oleophobic-hydrophilic surfaces, underwater superoleophoric surfaces, and smart surface.
Journal ArticleDOI
Special oleophobic and hydrophilic surfaces: approaches, mechanisms, and applications
TL;DR: In this paper, the authors focused on recent advances in oleophobic and hydrophilic surfaces and summarized three approaches, including simultaneously oleophoric/hydrophilic behavior, oleophoby/hydophilic switching behavior, and hydophilic/underwater superoleophobic behavior, to achieve this surface.
Journal ArticleDOI
Biomimetic superoleophobic surfaces: focusing on their fabrication and applications
TL;DR: There are various methods to fabricate superoleophobic surfaces, which are generally divided into two ways: top-down and bottom-up methods as mentioned in this paper, and each has its own merits and demerits.
Journal ArticleDOI
Recent advances of bioinspired functional materials with specific wettability: from nature and beyond nature
TL;DR: This review focuses on advances over the last three years in bioinspired multiscale functional materials with specific wettability, with an emphasis on the cooperation between structural characteristics and macroscopic properties.
References
More filters
Journal ArticleDOI
Poly(dimethylsiloxane) as a material for fabricating microfluidic devices.
TL;DR: This Account summarizes techniques for fabrication and applications in biomedicine of microfluidic devices fabricated in poly(dimethylsiloxane) (PDMS).
Journal ArticleDOI
Characterization and Distribution of Water-repellent, Self-cleaning Plant Surfaces
TL;DR: The importance of roughness and water-repellency, respectively, as the basis of an anti-adhesive, self-cleaning surface, in comparison to other functions of microstructures, is discussed.
Journal ArticleDOI
Effects of Surface Structure on the Hydrophobicity and Sliding Behavior of Water Droplets
TL;DR: In this article, the sliding behavior of water droplets over pillarlike and groove structures was investigated and a proper design of the surface with respect to shape and extent of the three-phase line is more effective than the increase of contact angles merely by decreasing the solid−water contact area.