Please use this identifier to cite or link to this item:
|Title: ||Plasma surface modification of degradable magnesium alloy and non degradable stainless steel: enhanced corrosion resistance, antimicrobial properties, cytocompatibility and covalent immobilization of protein molecules|
|Authors: ||Mohammed Ibrahim, Jamesh|
|Issue Date: ||Jul-2014|
|Publisher: ||University of Sydney|
Faculty of Science
|Abstract: ||Surface modification is the viable approach to improve the surface properties of the biomaterials. Plasma treatments used in this thesis are plasma ion implantation, cathodic arc deposition and plasma assisted chemical vapor deposition (PACVD) which is explained detail in chapter (c) 1.
Mg alloys possess good mechanical properties and degrades in physiological environment which makes them attractive biodegradable biomaterials. However, their degradation rate is rapid. In c 2, we investigate the corrosion behavior of WE43 and ZK60 Mg alloys in Ringer's solution and simulated body fluids (SBF). Ca10(PO4)6(OH)2, Ca3(PO4)2⋅3H2O, and Mg(OH)2 are predominant corrosion products formed on both Mg alloys in SBF whereas crystalline aragonite form of CaCO3 and Mg(OH)2 dominate in Ringer’s solution. In c 3, we investigate the corrosion resistance of WE43 Mg alloy after Si plasma ion implantation. In c 4, we investigate the corrosion behavior of WE43 Mg alloy in SBF and cell culture medium after Zr&N implantation. In c 5, we investigate the corrosion resistance of ZK60 Mg alloy after Zr&O implantation. In c 6, we investigate the corrosion resistance, cytocompatibility, and antimicrobial activity of Mg–Ca and Mg–Sr alloys after Zr&O implantation. In c 7, we investigate the corrosion resistance of Mg–Nd–Zn–Zr alloy after C2H2 implantation. The corrosion resistance of Mg alloys in physiological environment are improved after Si, Zr, Zr&O, Zr & N, C2H2 implantation. Zr&O implantation enhanced the cytocompatibility, and antimicrobial properties of Mg–Ca and Mg–Sr alloys.
Stainless steel is used in implants. However implant materials subject to adverse responses because of the weak interaction with the protein molecules. In c 8, we demonstrated that the deposition of a Ti&C composite graded film by hybrid cathodic arc/glow discharge PACVD. Strong adhesion was achieved between the metal surface and the deposited layers. Graded film exhibited strong adhesion with protein molecules.|
|Access Level: ||Access is restricted to staff and students of the University of Sydney . UniKey credentials are required. Non university access may be obtained by visiting the University of Sydney Library.|
|Rights and Permissions: ||The author retains copyright of this thesis. It may only be used for the purposes of research and study. It must not be used for any other purposes and may not be transmitted or shared with others without prior permission.|
|Type of Work: ||PhD Doctorate|
|Type of Publication: ||Doctor of Philosophy Ph.D.|
|Appears in Collections:||Sydney Digital Theses (University of Sydney Access only)|
This work is protected by Copyright. All rights reserved. Access to this work is provided for the purposes of personal research and study. Except where permitted under the Copyright Act 1968, this work must not be copied or communicated to others without the express permission of the copyright owner. Use the persistent URI in this record to enable others to access this work.
|2015_Jamesh_Ibrahim_Thesis.pdf||PhD Thesis||19.81 MB||Adobe PDF|
Items in Sydney eScholarship Repository are protected by copyright, with all rights reserved, unless otherwise indicated.