Bioactive hydroxyapatite/graphene composite coating and its corrosion stability in simulated body fluid

Ana Janković, Sanja Eraković, Miodrag Mitrić, Ivana Z. Matić, Zorica D. Juranić, Chi Pong Tsui, Chak Yin Tang, Vesna Mišković-Stanković, Kyong Yop Rhee, Soo Jin Park

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The hydroxyapatite/graphene (HAP/Gr) composite was electrodeposited on Ti using the electrophoretic deposition process to obtain uniform bioactive coating with improved mechanical strength and favorable corrosion stability in simulated body fluid (SBF). Incorporation of Gr was verified by Raman spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron analysis. The HAP/Gr composite coating exhibited reduced surface cracks, nearly double the hardness, and elastic modulus increased by almost 50% compared to pure HAP coating, as estimated by a nanoindentation test. The bioactive HAP/Gr composite coating provided a newly formed apatite layer in SBF with enhanced corrosion stability, as evidenced by electrochemical impedance spectroscopy. The thermal stability of the HAP/Gr coating was improved in comparison to the pure HAP coating, and the Ca/P ratio was closer to the stoichiometric value. No antibacterial activity against Staphylococcus aureus or Escherichia coli could be verified. The HAP/Gr composite coating was classified as non-cytotoxic when tested against healthy peripheral blood mononuclear cells (PBMC).
Original languageEnglish
Pages (from-to)148-157
Number of pages10
JournalJournal of Alloys and Compounds
Volume624
DOIs
Publication statusPublished - 5 Mar 2015

Keywords

  • Corrosion
  • Mechanical properties
  • Nano-structures
  • Surface analysis

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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