Toward hydrophobicity without surface functionalization through organosilane sol gel coatings on nano-roughed aluminum substrate

Document Type : Research Paper

Authors

Faculty of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran.

Abstract

Hydrophobic and superhydrophobic coatings can be fabricated through the traditional two-step method, including fabrication of hierarchical micro and nanoscale roughness along with surface modification using low energy materials like fatty acids and fluoropolymers. Using a low energy material is not suitable due to its weak chemical bonding to the surface, and also, some of the used materials are toxic. Herein, a novel method has been introduced to fabricate the hydrophobic coating using the Wenzel wetting model. The aluminum substrate was chemically etched to create the nano-roughed surface structure and subsequent silane-based coatings can lead to increase the water contact angle without using any surface functionalization with low energy materials. In addition to that, two type of silane-based sol-gel coatings (TEOS and TEOS/GPTMS) have been used to investigate the benefits of hybrid organosilane sol-gel coating. The results indicated that the increasing in the surface roughness of silane-based coatings using chemical etching of the substrate leads to increase the water contact angle to hydrophobic state, which is supported by the Wenzel wetting model. The corrosion mitigation behavior of silane-based coatings on different substrate (bare and etched aluminum) has been studied in details.

Keywords

References

1. Ganesh VA, Raut HK, Nair AS, Ramakrishna S. A review on self-cleaning coatings. Journal of Materials Chemistry. 2011;21(41):16304.
2. Dalawai SP, Saad Aly MA, Latthe SS, Xing R, Sutar RS, Nagappan S, et al. Recent Advances in durability of superhydrophobic self-cleaning technology: A critical review. Progress in Organic Coatings. 2020;138:105381.
3. Mohamed AMA, Abdullah AM, Younan NA. Corrosion behavior of superhydrophobic surfaces: A review. Arabian Journal of Chemistry. 2015;8(6):749-65.
4. Al-Naamani L, Dobretsov S, Dutta J, Burgess JG. Chitosan-zinc oxide nanocomposite coatings for the prevention of marine biofouling. Chemosphere. 2017;168:408-17.
5. Kazem HA, Chaichan MT, Al-Waeli AHA, Sopian K. A review of dust accumulation and cleaning methods for solar photovoltaic systems. Journal of Cleaner Production. 2020;276:123187.
6. E J, Jin Y, Deng Y, Zuo W, Zhao X, Han D, et al. Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review. Advanced Materials Interfaces. 2017;5(1):1701052.
7. Dai X, Stogin BB, Yang S, Wong T-S. Slippery Wenzel State. ACS Nano. 2015;9(9):9260-7.
8. Kwon Y, Patankar N, Choi J, Lee J. Design of Surface Hierarchy for Extreme Hydrophobicity. Langmuir. 2009;25(11):6129-36.
9. Lai Y, Huang Y, Wang H, Huang J, Chen Z, Lin C. Selective formation of ordered arrays of octacalcium phosphate ribbons on TiO2 nanotube surface by template-assisted electrodeposition. Colloids and Surfaces B: Biointerfaces. 2010;76(1):117-22.
10. Song J, Xu W, Liu X, Lu Y, Wei Z, Wu L. Ultrafast fabrication of rough structures required by superhydrophobic surfaces on Al substrates using an immersion method. Chemical Engineering Journal. 2012;211-212:143-52.
11. Borras A, Barranco A, González-Elipe AnR. Reversible Superhydrophobic to Superhydrophilic Conversion of Ag@TiO2Composite Nanofiber Surfaces. Langmuir. 2008;24(15):8021-6.
12. Bravo J, Zhai L, Wu Z, Cohen RE, Rubner MF. Transparent Superhydrophobic Films Based on Silica Nanoparticles. Langmuir. 2007;23(13):7293-8.
13. Sun C, Ge L-Q, Gu Z-Z. Fabrication of super-hydrophobic film with dual-size roughness by silica sphere assembly. Thin Solid Films. 2007;515(11):4686-90.
14. Ma M, Hill RM, Lowery JL, Fridrikh SV, Rutledge GC. Electrospun Poly(Styrene-block-dimethylsiloxane) Block Copolymer Fibers Exhibiting Superhydrophobicity. Langmuir. 2005;21(12):5549-54.
15. Mizukoshi T, Matsumoto H, Minagawa M, Tanioka A. Control over wettability of textured surfaces by electrospray deposition. Journal of Applied Polymer Science. 2006;103(6):3811-7.
16. Guglielmi M. Sol-gel coatings on metals. Journal of Sol-Gel Science and Technology. 1997;8(1-3):443-9.
17. Khramov AN, Voevodin NN, Balbyshev VN, Donley MS. Hybrid organo-ceramic corrosion protection coatings with encapsulated organic corrosion inhibitors. Thin Solid Films. 2004;447-448:549-57.
18. Pepe A, Aparicio M, Durán A, Ceré S. Cerium hybrid silica coatings on stainless steel AISI 304 substrate. Journal of Sol-Gel Science and Technology. 2006;39(2):131-8.
19. G. Kickelbick, Hybrid materials: synthesis, characterization, and applications: John Wiley & Sons, 2007.
20. Hojjati Najafabadi A, Shoja Razavi R, Mozaffarinia R, Rahimi H. A New Approach of Improving Rain Erosion Resistance of Nanocomposite Sol-Gel Coatings by Optimization Process Factors. Metallurgical and Materials Transactions A. 2014;45(5):2522-31.
Journal of Ultrafine Grained and Nanostructured Materials
Volume 53, Issue 2
December 2020
Pages 117-126

Files

History

  • Receive Date: 15 June 2020
  • Revise Date: 13 August 2020
  • Accept Date: 08 October 2020

Share

How to cite

Statistics