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Article

Three-Dimensional Soft Material Micropatterning via Grayscale Photolithography for Improved Hydrophobicity of Polydimethylsiloxane (PDMS)

1
Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat 86400, Johor, Malaysia
2
Microelectronic & Nanotechnology—Shamsuddin Research Centre (MiNT-SRC), Universiti Tun Hussein Onn Malaysia, Batu Pahat 86400, Johor, Malaysia
3
Collaborative Microelectronic Design Excellence Center (CEDEC), [email protected], Universiti Sains Malaysia, Bayan Lepas 11900, Pulau Pinang, Malaysia
*
Author to whom correspondence should be addressed.
Academic Editor: Aiqun Liu
Micromachines 2022, 13(1), 78; https://doi.org/10.3390/mi13010078
Received: 22 October 2021 / Revised: 24 December 2021 / Accepted: 28 December 2021 / Published: 1 January 2022
In this present work, we aim to improve the hydrophobicity of a polydimethylsiloxane (PDMS) surface. Various heights of 3D PDMS micropillars were fabricated via grayscale photolithography, and improved wettability was investigated. Two approaches of PDMS replication were demonstrated, both using a single master mold to obtain the micropillar arrays. The different heights of fabricated PDMS micropillars were characterized by scanning electron microscopy (SEM) and a surface profiler. The surface hydrophobicity was characterized by measuring the water contact angles. The fabrication of PDMS micropillar arrays was shown to be effective in modifying the contact angles of pure water droplets with the highest 157.3-degree water contact angle achieved by implementing a single mask grayscale lithography technique. View Full-Text
Keywords: grayscale lithography; hydrophobic; micro 3D structure; droplet; contact angle grayscale lithography; hydrophobic; micro 3D structure; droplet; contact angle
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MDPI and ACS Style

Hamid, I.S.L.A.; Khi Khim, B.; Mohamed Omar, M.F.; Mohamad Zain, K.A.; Abd Rhaffor, N.; Sal Hamid, S.; Abd Manaf, A. Three-Dimensional Soft Material Micropatterning via Grayscale Photolithography for Improved Hydrophobicity of Polydimethylsiloxane (PDMS). Micromachines 2022, 13, 78. https://doi.org/10.3390/mi13010078

AMA Style

Hamid ISLA, Khi Khim B, Mohamed Omar MF, Mohamad Zain KA, Abd Rhaffor N, Sal Hamid S, Abd Manaf A. Three-Dimensional Soft Material Micropatterning via Grayscale Photolithography for Improved Hydrophobicity of Polydimethylsiloxane (PDMS). Micromachines. 2022; 13(1):78. https://doi.org/10.3390/mi13010078

Chicago/Turabian Style

Hamid, Intan Sue Liana Abdul, Beh Khi Khim, Mohammad Faiz Mohamed Omar, Khairu Anuar Mohamad Zain, Nuha Abd Rhaffor, Sofiyah Sal Hamid, and Asrulnizam Abd Manaf. 2022. "Three-Dimensional Soft Material Micropatterning via Grayscale Photolithography for Improved Hydrophobicity of Polydimethylsiloxane (PDMS)" Micromachines 13, no. 1: 78. https://doi.org/10.3390/mi13010078

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