Single Pass Laser Process for Super-Hydrophobic Flexible Surfaces with Micro/Nano Hierarchical Structures

Materials
Hyuk-Jun KwonJae-Hyuck Yoo

Abstract

Wetting has been studied in various fields: chemical industry, automobile manufacturing, food companies, and even life sciences. In these studies, super-hydrophobic surfaces have been achieved through complex steps and processes. To realize super-hydrophobicity, however, we demonstrated a simple and single pass laser process for the fabrication of micro/nano hierarchical structures on the flexible polytetrafluoroethylene (PTFE, Teflon) surface. The fabricated hierarchical structures helped increase the hydrophobicity by augmenting the surface roughness and promoting air-trapping. In addition, we employed a low-cost and high-throughput replication process producing numerous polydimethylsiloxane (PDMS) replicas from the laser-processed PTFE film. Thanks to the anti-adhesive characteristics of PTFE and the elasticity of PDMS, the structure perfectly transferred to the replica without any mechanical failure. Moreover, our designed mesh patterns offered the possibility of large area applications through varying the process parameters (pitch, beam spot size, laser fluence, and scan speed). Even though mesh patterns had relatively large pitch (190 μm), we were able to achieve high contact angle (>150°). Through pneumatically deformed ...Continue Reading

References

Jun 24, 2003·Nature Materials·Aurélie Lafuma, David Quéré
Aug 21, 2007·Nano Letters·Michael Nosonovsky, Bharat Bhushan
Sep 18, 2010·Journal of Colloid and Interface Science·Zhiguang GuoBao-Lian Su
Feb 16, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Stefan JungDimos Poulikakos
May 4, 2011·Advanced Materials·Henrikki MertaniemiRobin H A Ras
Jan 25, 2013·Advanced Materials·Erica Ueda, Pavel A Levkin
May 1, 2013·Proceedings of the National Academy of Sciences of the United States of America·Katrina M WisdomChuan-Hua Chen
Mar 20, 2007·Soft Matter·Pieter van der Wal, Ullrich Steiner

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Citations

Oct 18, 2019·ACS Applied Materials & Interfaces·Zhengliang SuCostas P Grigoropoulos

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Methods Mentioned

BETA
scanning electron microscopy
chemical treatment

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