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Effect of Alkyl Chain Length on Carboxylic Acid SAMs on Ti-6Al-4V
Department of Chemistry and Biochemistry, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA 15282, USA
McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA
* Author to whom correspondence should be addressed.
Received: 23 May 2012; in revised form: 29 June 2012 / Accepted: 6 July 2012 / Published: 9 July 2012
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.
Keywords: self-assembled monolayers; Ti-6Al-4V; carboxylic acids; diffuse reflectance infrared Fourier transform spectroscopy; matrix assisted laser desorption ionization-time of flight mass spectrometry; contact angle
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Buckholtz, G.A.; Gawalt, E.S. Effect of Alkyl Chain Length on Carboxylic Acid SAMs on Ti-6Al-4V. Materials 2012, 5, 1206-1218.
Buckholtz GA, Gawalt ES. Effect of Alkyl Chain Length on Carboxylic Acid SAMs on Ti-6Al-4V. Materials. 2012; 5(7):1206-1218.
Buckholtz, Gavin A.; Gawalt, Ellen S. 2012. "Effect of Alkyl Chain Length on Carboxylic Acid SAMs on Ti-6Al-4V." Materials 5, no. 7: 1206-1218.