Hydrophilic patterning of superhydrophobic surfaces by atmospheric-pressure plasma jet

Faze Chen; Wenji Xu; Yao Lu; Jinlong Song; Shuai Huang; Long Wang; Ivan P. Parkin; Xin Liu

Hydrophilic patterning of superhydrophobic surfaces by atmospheric-pressure plasma jet

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Author(s): Faze Chen ¹ ; Wenji Xu ¹ ; Yao Lu ² ; Jinlong Song ¹ ; Shuai Huang ¹ ; Long Wang ¹ ; Ivan P. Parkin ² ; Xin Liu ¹
- Affiliations: 1: Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, People's Republic of China;
  2: Department of Chemistry, Materials Chemistry Research Centre, University College London, 20 Gordon Street, London, WC1H OAJ, United Kingdom
Source: Volume 10, Issue 2, February 2015, p. 105 – 108
DOI: 10.1049/mnl.2014.0590 , Online ISSN 1750-0443

Received 19/10/2014, Accepted 03/12/2014, Revised 26/11/2014, Published 17/02/2015

An atmospheric-pressure plasma jet (APPJ) has been developed to fabricate hydrophilic patterns on superhydrophobic surfaces. The surface morphologies, chemical compositions and wettability were investigated using scanning electron microscopy, Fourier-transform infrared spectrophotometry, X-ray photoelectron spectroscopy and water contact angle measurement. The results show that the superhydrophobic areas exposed to the APPJ could be completely converted to superhydrophilic without changing the macro and microsurface morphologies. The transition from superhydrophobicity to superhydrophilicity is because of the decrease of hydrophobic fluorine-containing functional groups and the increase of the hydrophilic oxygen-containing functional groups. Combined with scanning and mask technology, complex and large-area wettability contrast patterns can be easily fabricated on various superhydrophobic substrates by the APPJ treatment. Additionally, the retention of intrinsic microstructures enables the surface to recover superhydrophobicity only by using surface fluorination. This results in a rapid reversible transition between superhydrophilicity and superhydrophobicity.

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Hydrophilic patterning of superhydrophobic surfaces by atmospheric-pressure plasma jet

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