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Bactericidal effect of silver-reinforced carbon nanotube and hydroxyapatite composites

Afzal, Mohammad Atif Faiz and Kalmodia, Sushma and Kesarwani, Pallavi and Basu, Bikramjit and Balani, Kantesh (2013) Bactericidal effect of silver-reinforced carbon nanotube and hydroxyapatite composites. In: JOURNAL OF BIOMATERIALS APPLICATIONS, 27 (8). pp. 967-978.

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Official URL: http://dx.doi.org/ 10.1177/0885328211431856

Abstract

Bacterial infection remains an important risk factor after orthopedic surgery. The present paper reports the synthesis of hydroxyapatite-silver (HA-Ag) and carbon nanotube-silver (CNT-Ag) composites via spark plasma sintering (SPS) route. The retention of the initial phases after SPS was confirmed by phase analysis using X-ray diffraction and Raman spectroscopy. Energy dispersive spectrum analysis showed that Ag was distributed uniformly in the CNT/HA matrix. The breakage of CNTs into spheroid particles at higher temperatures (1700 degrees C) is attributed to the Rayleigh instability criterion. Mechanical properties (hardness and elastic modulus) of the samples were evaluated using nanoindentation testing. Ag reinforcement resulted in the enhancement of hardness (by similar to 15%) and elastic modulus (similar to 5%) of HA samples, whereas Ag reinforcement in CNT, Ag addition does not have much effect on hardness (0.3 GPa) and elastic modulus (5 GPa). The antibacterial tests performed using Escherichia coli and Staphylococcus epidermidis showed significant decrease (by similar to 65-86%) in the number of adhered bacteria in HA/CNT composites reinforced with 5% Ag nanoparticles. Thus, Ag-reinforced HA/CNT can serve as potential antibacterial biocomposites.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the SAGE PUBLICATIONS LTD, LONDON EC1Y 1SP, ENGLAND.
Keywords: Antibacterial; silver; carbon nanotubes; hydroxyapatite; nanoindentation; biocomposite
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 10 Mar 2014 06:38
Last Modified: 19 Mar 2014 05:02
URI: http://eprints.iisc.ac.in/id/eprint/48522

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