Investigation of static and dynamic wetting transitions of UV responsive tunable wetting surfaces

Reeta Pant; Subhash Singha; Aritra Bandyopadhyay; Krishnacharya Khare

doi:10.1016/j.apsusc.2013.12.049

Investigation of static and dynamic wetting transitions of UV responsive tunable wetting surfaces

Reeta Pant, Subhash Singha, Aritra Bandyopadhyay, Krishnacharya Khare

Indian Institute of Technology Kanpur

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Ultraviolet (UV) radiation responsive surfaces, with tunable wetting properties, are fabricated by spin casting polystyrene/titania nanocomposite dispersion in tetrahydrofuran on silicon substrates. The prepared samples are found hydrophilic due to the presence of the water miscible solvent. Upon annealing, as the solvent evaporates, samples become superhydrophobic due to presence of hydrophobic polystyrene and formation of nano and micro scale surface roughness due to titania nanoparticles. Effect of different annealing temperatures and time on resulting wettability is investigated. Photocatalytic property of titania is exploited to make transition from superhydrophobic to hydrophilic state upon UV exposure. Subsequently, upon annealing again at elevated temperatures for sufficient time, the UV exposed hydrophilic samples recover their superhydrophobicity showing transition from hydrophilic to superhydrophobic state. Detailed static and dynamic study of these reversible transitions, between superhydrophobic and hydrophilic states, due to UV exposure and annealing is presented in this article.

Original language	English
Pages (from-to)	777-781
Number of pages	5
Journal	Applied Surface Science
Volume	292
DOIs	https://doi.org/10.1016/j.apsusc.2013.12.049
State	Published - 15 Feb 2014
Externally published	Yes

Bibliographical note

Funding Information:
This research work was supported by BRNS (DAE) Young Scientist Research Award and DST, New Delhi through its Unit of Excellence on Soft Nanofabrication at IIT Kanpur.

Funding

This research work was supported by BRNS (DAE) Young Scientist Research Award and DST, New Delhi through its Unit of Excellence on Soft Nanofabrication at IIT Kanpur.

Funders	Funder number
Indian Institute of Technology Kanpur
Department of Science and Technology, Ministry of Science and Technology, India
Department of Atomic Energy, Government of India
Board of Research in Nuclear Sciences

Keywords

Photo-responsive
Superhydrophobic
Surface modification
Titania
Tunable wetting

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10.1016/j.apsusc.2013.12.049

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title = "Investigation of static and dynamic wetting transitions of UV responsive tunable wetting surfaces",

abstract = "Ultraviolet (UV) radiation responsive surfaces, with tunable wetting properties, are fabricated by spin casting polystyrene/titania nanocomposite dispersion in tetrahydrofuran on silicon substrates. The prepared samples are found hydrophilic due to the presence of the water miscible solvent. Upon annealing, as the solvent evaporates, samples become superhydrophobic due to presence of hydrophobic polystyrene and formation of nano and micro scale surface roughness due to titania nanoparticles. Effect of different annealing temperatures and time on resulting wettability is investigated. Photocatalytic property of titania is exploited to make transition from superhydrophobic to hydrophilic state upon UV exposure. Subsequently, upon annealing again at elevated temperatures for sufficient time, the UV exposed hydrophilic samples recover their superhydrophobicity showing transition from hydrophilic to superhydrophobic state. Detailed static and dynamic study of these reversible transitions, between superhydrophobic and hydrophilic states, due to UV exposure and annealing is presented in this article.",

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author = "Reeta Pant and Subhash Singha and Aritra Bandyopadhyay and Krishnacharya Khare",

note = "Funding Information: This research work was supported by BRNS (DAE) Young Scientist Research Award and DST, New Delhi through its Unit of Excellence on Soft Nanofabrication at IIT Kanpur.",

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AU - Khare, Krishnacharya

N1 - Funding Information: This research work was supported by BRNS (DAE) Young Scientist Research Award and DST, New Delhi through its Unit of Excellence on Soft Nanofabrication at IIT Kanpur.

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N2 - Ultraviolet (UV) radiation responsive surfaces, with tunable wetting properties, are fabricated by spin casting polystyrene/titania nanocomposite dispersion in tetrahydrofuran on silicon substrates. The prepared samples are found hydrophilic due to the presence of the water miscible solvent. Upon annealing, as the solvent evaporates, samples become superhydrophobic due to presence of hydrophobic polystyrene and formation of nano and micro scale surface roughness due to titania nanoparticles. Effect of different annealing temperatures and time on resulting wettability is investigated. Photocatalytic property of titania is exploited to make transition from superhydrophobic to hydrophilic state upon UV exposure. Subsequently, upon annealing again at elevated temperatures for sufficient time, the UV exposed hydrophilic samples recover their superhydrophobicity showing transition from hydrophilic to superhydrophobic state. Detailed static and dynamic study of these reversible transitions, between superhydrophobic and hydrophilic states, due to UV exposure and annealing is presented in this article.

AB - Ultraviolet (UV) radiation responsive surfaces, with tunable wetting properties, are fabricated by spin casting polystyrene/titania nanocomposite dispersion in tetrahydrofuran on silicon substrates. The prepared samples are found hydrophilic due to the presence of the water miscible solvent. Upon annealing, as the solvent evaporates, samples become superhydrophobic due to presence of hydrophobic polystyrene and formation of nano and micro scale surface roughness due to titania nanoparticles. Effect of different annealing temperatures and time on resulting wettability is investigated. Photocatalytic property of titania is exploited to make transition from superhydrophobic to hydrophilic state upon UV exposure. Subsequently, upon annealing again at elevated temperatures for sufficient time, the UV exposed hydrophilic samples recover their superhydrophobicity showing transition from hydrophilic to superhydrophobic state. Detailed static and dynamic study of these reversible transitions, between superhydrophobic and hydrophilic states, due to UV exposure and annealing is presented in this article.

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Investigation of static and dynamic wetting transitions of UV responsive tunable wetting surfaces

Abstract

Bibliographical note

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Keywords

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