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research-article

Fast fabrication of superhydrophobic titanium alloy as antibacterial surface using nanosecond laser texturing

[+] Author and Article Information
Deepak Patil

Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India-110016
deepakpatil3030@gmail.com

S. Aravindan

Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India-110016
aravindan@mech.iitd.ac.in

Mishi Kaushal Wasson

Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi, India-110016
mishi.wasson@gmail.com

P. Vivekanandan

Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi, India-110016
vperumal@bioschool.iitd.ac.in

P. V. Rao

Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India-110016
pvrao@mech.iitd.ernet.in

1Corresponding author.

ASME doi:10.1115/1.4038093 History: Received April 29, 2017; Revised September 15, 2017

Abstract

The method for fast fabrication of superhydrophobic surfaces was proposed to resist the formation of biofilm ofEscherichia coli (E.coli) and Staphylococcus aureus (S. aureus) for orthopedic and dental implants. Laser beam machining with nanosecond pulsed laser (Nd:YAG) was used to fabricate pit structure on Grade-5 Ti-6Al-4V alloy followed by annealing (at 3000C with different time scales) in order to reduce the transition time from hydrophilic to superhydrophobic surface generation. Field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD) techniques were used to characterize the textured samples. The surface wettability of plain and textured samples was measured by the sessile drop method using goniometer. The biofilm formation was quantitatively and qualitatively evaluated by crystal violet binding assay and field emission scanning electron microscopy respectively. The biofilm formation is observed on plain (hydrophilic) surface for both the types of bacteria, whereas significantly less biofilm formation is observed on the laser textured (superhydrophobic) surfaces. The proposed methodhelps in reducing the risk of infection associated with implants without using cytotoxic bactericidal agents.

Copyright (c) 2017 by ASME
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