Journal
APPLIED SURFACE SCIENCE
Volume 292, Issue -, Pages 390-399Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2013.11.150
Keywords
AuNPs; Chitosan; NiTi; Electrochemical impedance; SEM; Antibacterial effect
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Funding
- Chemistry Department (Taif University, kingdom of Saudi Arabia)
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Biocomposite consists of gold nanoparticles (AuNPs) and a natural polymer as Chitosan (CS) was electrodeposited over NiTi alloy to improve biocompatibility, biostability, surface corrosion resistance and antibacterial effect for orthopedic implantation. The forming process and surface morphology of this biocomposite coats over NiTi alloy were studied. The results showed that the nm-scale gold particles were embedded in the composite forming compact, thick and smooth coat. Elemental analysis revealed significant less Ni ion release from the coated NiTi alloy compared with the uncoated one by 20 fold. Furthermore, the electrochemical corrosion measurements indicated that AuNPs/CS composite coat was effective for improving corrosion resistance in different immersion times and at all pH values, which suggests that the coated NiTi alloys have potential for orthopedic applications. Additionally, the efficiencies of the biocomposite coats for inhibiting bacterial growth indicate high antibacterial effect. (C) 2013 Elsevier B.V. All rights reserved.
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