Elsevier

Materials Science and Engineering: C

Volume 59, 1 February 2016, Pages 740-747
Materials Science and Engineering: C

Structure, apatite inducing ability, and corrosion behavior of chitosan/halloysite nanotube coatings prepared by electrophoretic deposition on titanium substrate

https://doi.org/10.1016/j.msec.2015.10.073Get rights and content

Highlights

  • Electrophoretic deposition was acquired for the generation of CS/HNT nanocomposite coatings.

  • Low water content alcoholic medium were provided desirable ζ and μ for HNTs.

  • HNTs were made carbonated hydroxyapatite deposition on CS/HNT coating.

  • Coatings of HNTs in chitosan matrix were improved corrosion resistance of Ti substrate.

Abstract

In this study chitosan/halloysite nanotube composite (CS/HNT) coatings were deposited by electrophoretic deposition (EPD) on titanium substrate. Using HNT particles were investigated as new substituents for carbon nanotubes (CNTs) in chitosan matrix coatings. The ability of chitosan as a stabilizing, charging, and blending agent for HNT particles was exploited. Furthermore, the effects of pH, electrophoretic bath, and sonicating duration were studied on the deposition of suspensions containing HNT particles. Microstructure properties of coatings showed uniform distribution of HNT particles in chitosan matrix to form smooth nanocomposite coatings. The zeta potential results revealed that at pH around 3 there is an isoelectric point for HNT and it would have cathodic and anionic states at pH values less and more than 3, respectively. Therefore, CS/HNT composite deposits were produced in the pH range of 2.5 to 3. The apatite inducing ability of chitosan-HNT composite coating assigned that HNT particles were biocompatible because they formed carbonated hydroxyapatite particles on CS/HNT coating in corrected simulated body fluid (C-SBF). Finally, electrochemical corrosion characterizations determined that corrosion resistance in CS/HNT coating has been improved compared to bare titanium substrate.

Keywords

Chitosan
Halloysite nanotube
Electrophoretic deposition
Composite coatings
Biomaterials

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