Preparation and Characterization of Alkylphosphonic Acid Self-Assembled Monolayers on Titanium Alloy by Chemisorption and Electrochemical Deposition

Abstract

Ti-6Al-4V alloy is the most commonly used alloy for dental and orthopedic implants. In order to improve osseointegration, different surface modification methods are usually employed, including self-assembled monolayers (SAMs). This study presents an investigation of both active (electroassisted) and passive (adsorption) approaches for the modification of Ti-6Al-4V using alkylphosphonic acid. The monolayers were characterized by cyclic voltammetry, double-layer capacitance, contact angle measurements, X-ray photoelectron spectroscopy, polarization modulation infrared reflection adsorption spectroscopy, electrochemical impedance spectroscopy, and corrosion potentiodynamic polarization measurements. It is shown that the electrochemically assisted monolayers, which are assembled faster, exhibit better control over surface properties, a superior degree of order, and a somewhat higher packing density. The electrosorbed SAMs also exhibit better blockage of electron transfer across the interface and thus have better corrosion resistance.

Phosphonate molecular layers on TiO2surfaces

“…In particular, surface functionalization able to improve the antimicrobial and osteointegration properties of the TiO2 surface is of large interest for implantology. Phosphonic acids [R-PO3H2] and their phosphonate ester derivatives [RPO3R2] are attractive anchoring groups for metal oxide surfaces [1][2][3][4][5][6][7].…”

Organic corrosion inhibitors: where are we now? A review. Part IV. Passivation and the role of mono- and diphosphonates

“…The high corrosion resistance of this light metal and its alloys in many corrosive environments at normal temperatures is well known, so it is not surprising that they are used as medical implants [69][70][71][72][73][74][75][76]. The utility of these materials can be greatly increased if the structure and chemistry of their surfaces can be controlled.…”

“…In [76] films of APh with various chain lengths (C 6 , C 10 , C 14 , and C 16 ) were formed on Ti-6Al-4V by chemisorption or electrochemical deposition. The alloy without and with modification was studied by various methods and it was found that long-chain acids form similar SAM, which results in more hydrophobic surfaces.…”

Surface bioactivation through the nanostructured layer on titanium modified by facile HPT treatment

“…In literatures, various methods have been used to prepare the expected surfaces on Ti and its alloys, such as chemical treatment 11 , sol-gel method 12 , chemical vapor deposition 13 , anodization 14 , hydrothermal (HT) method 15 and electro-deposition 16 , plasma or microarc oxidation 17–19 . Among them, chemical treatment in alkali solutions is a strong contender to produce a nanoscaled network structure on the surface of Ti and its alloys.…”