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Research Papers: Tribochemistry and Tribofilms

Design and Synthesis of a Superhydrophobic PVDF-Based Composite

[+] Author and Article Information
Hyunho Choi, Kyungjun Lee, John Reeks

Mechanical Engineering,
Texas A&M University,
College Station, TX 77843

Hong Liang

Mechanical Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: hliang@tamu.edu

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 18, 2015; final manuscript received July 23, 2015; published online October 15, 2015. Assoc. Editor: Min Zou.

J. Tribol 138(2), 022301 (Oct 15, 2015) (6 pages) Paper No: TRIB-15-1124; doi: 10.1115/1.4031402 History: Received April 18, 2015; Revised July 23, 2015

The ability to design, control, and synthesize a material surface with superhydrophobicity is of great interests in many engineering applications. Here, we report a cost-effective process to fabricate poly(vinylidene fluoride) (PVDF)/zirconium(IV) oxide (ZrO2) composites with superhydrophobicity. This is achieved by combining an antisolvent that induces phase separation, i.e., the precipitation of PVDF from the solution through a spray-on method on various liquids. The material surfaces possess wrinkled micron-sized beads which displayed superhydrophobicity in water without any chemical treatment. The process developed in this research presented a fast and simple approach in making hydrophobic surfaces.

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Figures

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Fig. 1

(a) Schematic fabrication process of spraying method and (b) PVDF films sprayed on water bath

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Fig. 2

SEM images of (1) upper sides, (2) bottom sides, and (3) beads on bottom: PVDF film (a) on water and (b) on ethanol/water and PVDF/ZrO2 PVDF film (c) on water and (d) on ethanol/water

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Fig. 3

Static contact angle by 5 μL water droplets (*two-sample t-test, p = 0.0275)

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Fig. 4

Tilting angles for sliding of 20 μL water droplets (*two-sample t-test, p = 0.0127)

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Fig. 5

Surface profiles of bottom sides: PVDF film (a) on water and (b) on ethanol/water and PVDF/ZrO2 composite PVDF film (c) on water and (d) on ethanol/water

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Fig. 6

Schematics of wetting models of improved- or superhydrophobic PVDF films and PVDF/ZrO2 films (a) on water and (b) ethanol/water

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