Preparation, characterisation, hardness and antibacterial properties of Zn–Ni–TiO₂ nanocomposites coatings

Abstract

Zn-Ni-TiO 2 nanocomposites with various amounts of TiO 2 were successfully prepared by electroplating method on copper substrates using an acidic solution with TiO nanoparticles in 2 suspension. The composition and morphology of the composite coatings were characterised respectively using of scanning electron microscope (SEM), energy dispersive spectrometer and elemental mapping analysis system. The microhardness of the nanocomposite coatings was investigated. The antibacterial activity of Zn-Ni-TiO 2 nanocomposites films was studied against Gram positive (Staphylococcus aureus) and Gram negative (Escherichia coli) bacteria. Antimicrobial property increased upon the increase in the TiO 2 concentration. In addition, the antimicrobial property was more pronounced with the positive bacteria than the negative one. These results demonstrated the microbiocidal property of TiO 2 , so Zn-Ni-TiO 2 coatings have great potential applications in reducing biofouling formation in devices that suffer from biofouling problems.

Sol‐gel preparation and properties of Ag‐containing bioactive glass films on titanium

“…Second, silver ions can produce reactive oxygen species (ROS) by catalyzing molecule oxygen in water, and ROS will cause bacteria death . The bactericidal mechanisms of Ag‐bioactive glass films can still work in vivo, which is unlike the photocatalysis related bactericidal mechanism of TiO 2 films …”

“…30 The bactericidal mechanisms of Ag-bioactive glass films can still work in vivo, which is unlike the photocatalysis related bactericidal mechanism of TiO 2 films. [24][25][26]31 Together with copper, silver is another effective inorganic antimicrobial regent. The studies have showed that Ag + ions have lower minimum inhibitory concentrations against bacteria including S. aureus and E. coli (MIC, 0.03-8 vs 256-448 lg/mL) and smaller Lethal doses 50 for L929 mouse fibroblast cells (LD50, 3.5910 À3 vs 2.3910 À1 mmol/L) than Cu 2+ ions.…”

Electrodeposited Zinc-Nickel Nanocomposite Coatings

“…To prevent agglomeration, various methods can be used such as organic additives, agitation of the solution, current density, etc. Treatment of the nanoparticles prior to deposition is varied throughout the field but the most common methods used for particle suspension are magnetic stirring, sonication or a combination of stirring and sonication prior to and during deposition [11][12][13]. In addition to treatment of the nanoparticles, concentration in the bath also affects the quality of the coatings.…”

“…Metal matrix composite (MMC) coatings are promising materials developed by inclusion of a dispersed reinforcing material into a metal matrix. MMC's can replace traditional materials through their ability to offer improved mechanical and physical properties such as increased hardness, wear resistance, low thermal expansion coefficients, lubrication properties, antibacterial properties and improved corrosion resistance [1][2][3][4][5][6][7][8][9][10][11]. Nanosized particle incorporation 2 A/dm 2 , 23 ± 2°C Ultrasonication and solution stirring during deposition.…”

“…An overview of the literature is shown in Table 1. The most commonly used reinforcement material for zinc-nickel coatings is Al 2 O 3 constituting ~32% of the papers, followed by TiO 2 and SiO 2 /SiC with ~20% each, carbon nanotubes and CeO 2 with ~8% each, and Al 2 O 3 /SiC, CeO 2 /SiO 2 and Mt with ~4% each [11][12][13].…”