Abstract
Magnesium (Mg), and its alloys, is being investigated for its potential biomedical applications for its use as a biodegradable metal. However surface modification strategies are needed to modify the surface of the Mg alloy for its applicability in these applications. Self-assembled monolayers (SAMs) have been investigated as a coating strategy on magnesium for biomedical applications. In this report we evaluate the oxidative interfacial stability of phosphonic nanocoatings on magnesium using spectroscopic techniques. Self-assembled mono-/multilayers (SAMs) of octadecylphosphonic acid (ODPA) were formed on the native oxide layer of magnesium alloy using solution deposition technique. The SAMs modified Mg alloy and its oxidative stability were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). FTIR studies indicated mono-/bidentate bonding of the phosphonic SAMs to the Mg alloy surface. XPS confirmed SAM formation showing presence of “P” peaks while consequently showing decrease in peak intensity of Mg peaks. XPS analysis of the phosphonate peaks showed consistent presence of this peak over a period of 21 days. AFM images showed consistent coverage of the Mg alloy over a period of 21 days. The results collectively confirm that the monolayers are stable under the chosen oxidative study.
Highlights
Magnesium (Mg) based alloys are one of the materials under investigation for their potential applicability as a metallic implant material for applications such as cardiovascular stent, orthopedic scaffold, and fixation devices [1,2,3]
They concluded that phosphonic Self-assembled monolayers (SAMs) of hydroxyl terminated (11-hydroxyundecyl) phosphonic acid were stable on the surface of titanium for up to a period of 14 days of ambient air exposure without any significant desorption
In this paper we present results analyzing the oxidative interfacial stability of phosphonic self-assembled monolayers on Mg alloy
Summary
Magnesium (Mg) based alloys are one of the materials under investigation for their potential applicability as a metallic implant material for applications such as cardiovascular stent, orthopedic scaffold, and fixation devices [1,2,3]. Mg is a lightweight metal with metallic properties similar to bone and has a natural ionic presence with significant functional roles in the biological system [4, 5]. They could potentially serve as a biocompatible, osteoconductive, degradable metallic scaffold implant for load-bearing orthopedic applications [4,5,6]. SAMs form structurally welldefined films on solid surface, they form spontaneously and under generally mild conditions, and they can be deposited
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