Effect of Alkyl Chain Length on carboxylic acid SAMs on Ti-6Al-4V

Citation for published article

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DOI

10.3390/ma5071206

Peer Reviewed

1

Document Type

Journal Article

Publication Date

8-7-2012

Publication Title

Materials

Keywords

Carboxylic acids, Contact angle, Diffuse reflectance infrared Fourier transform spectroscopy, Matrix assisted laser desorption ionization-time of flight mass spectrometry, Self-assembled monolayers, Ti-6al-4v

School

Bayer School of Natural and Environmental Sciences

Primary Author Department

Chemistry and Biochemistry

Abstract

The formation of methyl-terminated carboxylic acid self-assembled monolayers (SAMs) with even numbers of carbons, from eighteen to thirty, was investigated on the oxide surface of Ti-6Al-4V and component metal oxides. Modified surfaces were characterized using diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), matrix assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) and contact angle analysis. Infrared spectroscopy indicated that using aerosol spray deposition techniques, stable, all-trans SAMs of octacosanoic (28 carbons) and triacontanoic (30 carbons) acids were formed on the alloy. Films were similarly formed on titanium and aluminum oxide. The surface of vanadium oxide exhibited limited reactivity. MALDI-TOF MS confirmed that formed films were monolayers, without multilayers or aggregates present. Water contact angles are indicative of the presence of hydrophobic methyl groups at the interface. This stable carboxylic acid SAM formation could be a useful alternative to phosphonic acid SAMs for corrosion and other applications. © 2012 by the authors; licensee MDPI, Basel, Switzerland.

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