Investigation of the Antibacterial Property of TiO2/Ag Nanotubes

, M.Sc. Thesis Sharif University of Technology Esfandiari, Naeemeh (Author) ; Simchi, Abdolreza (Supervisor) ; Bagheri, Reza (Supervisor)

Abstract

This study was performed to synthesize Ag-doped TiO2 nanotubes and investigate the antibacterial property of the nanostructure. In the first step, self-organized TiO2 nanotubes were fabricated through anodizing in an electrolyte containing 0٫3 Wt% NH4F, 0٫2٪V DI water and ethylene glycol. Anodizing was performed in 30 and 60V for 2hrs in order to have different nanotube diameters. In the second step, photoreduction process was done on the way to dope Ag nanoparticles on the nanotubes. Herein, AgNO3 solution concentration, time period of TiO2 nanotubes soaking in the solution, time period of UV irradiation and ethanol solution concentration were taken as factors to achieve Ag nanoparticles in...

Implementation of Vibration Assisted Milling on Titanium and Investigation of its Effects on Surface Texture and Biocompatibility

, M.Sc. Thesis Sharif University of Technology Ruhibakhsk, Reza (Author) ; Akbari, Javad (Supervisor)

Abstract

Titanium is the most widely used material in medical implants. One of the drawbacks of utilizing titanium in implants, is its biologically inert surface; which hinders the creation of the optimal bond between the implant and the surrounding tissue. This limitation can be addressed by altering the surface texture. As a technology, applying vibration to the tool or workpiece during machining operations is a practical method to create surface micro textures. Upon reviewing the existing literature, it is evident that the impact of the surface texture achieved by vibration-assisted milling, on the interaction of bone cells with the titanium surface has not been investigated. Therefore, this...

Finite Element Modeling and Additive Manufacturing of Meta-Material Bone Implants with Shape Memory Properties

, M.Sc. Thesis Sharif University of Technology Jalali, Mojtaba (Author) ; Movahhedy, Mohammad Reza (Supervisor) ; Mohammadi, Kaivan (Co-Supervisor)

Abstract

Millions of people due to factors such as osteoporosis, aging, sports incidents, and accidents face complications from bone fracture injuries every year. Nitinol shape memory alloy and Gyroid metamaterial have attracted researchers to use them as suitable replacements to fill empty areas of broken bones. In this research, numerical modeling and additive manufacturing were used to take advantage of the special properties of both nitinol and gyroid structures. In the modeling section, finite element modeling of the superelastic effect and the one-way shape memory effect of sheet and solid gyroids in cubic and cylindrical geometries with different porosities were done. As a result of the...