Multiwalled Carbon Nanotubes Reinforced Hydroxyapatite‐Chitosan Composite Coating on Ti Metal: Corrosion and Mechanical Properties

Abstract

Multiwalled carbon nanotubes (MWCNT) reinforced Hydroxyapatite‐chitosan composite coating is developed on Titanium metal by single step Electrophoretic deposition (EPD). By suitably controlling EPD process parameters, it has been possible to co‐deposit MWCNT and hydroxyapatite (HAp) electrophoretically and chitosan electrochemically on Ti metal from acetic acid/water/ethanol mixed solvent containing dissolved chitosan. At optimized process parameters, the coating contains uniform incorporation of MWCNT in porous HAp‐chitosan matrix, having composition of 10–12 wt% chitosan, 10–15 wt% MWCNT, rest HAp, as determined by thermogravimetric analysis. Raman spectra of composite coating reveal almost unaffected characteristics of carbon nanotubes. Adhesion strength and microhardness of composite HAp‐chitosan‐MWCNT coating increases compared with HAp coating. Composite coating is found to be highly corrosion resistance with corrosion current at 9 nA/cm2. The apatite growth after immersion in simulated body fluid for 10 days shows that the composite HAp‐chitosan‐MWCNT coating is bioactive in nature.

Preparation and characterization of carboxyl functionalized multiwall carbon nanotubes–hydroxyapatite composites

“…11) of fMWCNT-HAPSi composite showed increased apatite growth and after 28 days of immersion, a new porous layer appeared. Generally when a composite is immersed in SBF (pH 7.4), ion exchange occurs between the surface layer and the SBF that results in dissolution of calcium and phosphate ions and absorption of protons from the SBF [47], finally a new apatite layer is formed.…”

Electrophoretic deposition of carbon nanotubes: recent progress and remaining challenges

“…In addition to these diphasic hybrids, a variety of ternary systems have been investigated, including the addition of graphene to CNT/MnO 2 films [108], as well as MnO 2 /alginate/CNT [176], HA/chitosan/ CNTs [80,166,177] and calcium phosphate (CaP)/ chitosan/CNT [81] composites. The adsorption of the charged polymer on both the CNTs and the other particulates not only increased the suspension stability, but also provided a binder to reduce cracking and to strengthen the adhesion of the deposited film to the substrate.…”

Fabrication, characterization, and in vitro study of zinc substituted hydroxyapatite/silk fibroin composite coatings on titanium for biomedical applications

“…chitosan) and co-deposited, which provide additional interesting features. 10,19 It was noticed that many metal ions play important roles during the formation of bones such as Mg 2þ20 and Zn 2þ . [21][22][23] Zinc substituted hydroxyapatite (ZnHAP) can stimulate the cell proliferation and bring additional benefits (e.g.…”