PM-IRRAS studies of the adsorption and stability of organophosphonate monolayers on passivated NiTi surfaces

M. Maxisch, C. Ebbert, B. Torun, N. Fink, T. de los Arcos, J. Lackmann, H.J. Maier, G. Grundmeier, APPLIED SURFACE SCIENCE 257 (2011) 2011–2018.

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Abstract
Alkylphosphonic acids of different alkyl chain lengths were adsorbed on electrochemically polished NiTi surfaces from ethanolic solutions. The electropolishing process led to passive films mainly composed of Ti-oxyhydroxide. The surface showed nanoscopic etching pits with a depths of about 2 nm and a diameter of about 20 nm. The interfacial binding mechanism of the phosphonic acid group to the oxyhydroxide surface and the ordering of the monolayer were spectroscopically analysed by means of infrared reflection absorption FTIR-spectroscopy with (PM-IRRAS) and without (IRRAS) photoelastic modulation. The comparison of IRRAS and PM-IRRAS data of the long chain octadecylphosphonic acid monolayer proved that the binding mechanism of the phosphonic acid group to the oxyhydroxide surface is based on a mono-or bidentate bond, which is not stable in the presence of high water activities. An alkyl chain length of 17 CH2 groups is required for the formation of self-assembled monolayers, which are stable in aqueous environments. These long chain aliphatic organophosphonic acid monolayers were shown to inhibit anodic and cathodic surface reactions. (C) 2010 Elsevier B.V. All rights reserved.
Publishing Year
Journal Title
APPLIED SURFACE SCIENCE
Volume
257
Issue
6
Page
2011-2018
ISSN
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Maxisch M, Ebbert C, Torun B, et al. PM-IRRAS studies of the adsorption and stability of organophosphonate monolayers on passivated NiTi surfaces. APPLIED SURFACE SCIENCE. 2011;257(6):2011-2018. doi:10.1016/j.apsusc.2010.09.044
Maxisch, M., Ebbert, C., Torun, B., Fink, N., de los Arcos, T., Lackmann, J., … Grundmeier, G. (2011). PM-IRRAS studies of the adsorption and stability of organophosphonate monolayers on passivated NiTi surfaces. APPLIED SURFACE SCIENCE, 257(6), 2011–2018. https://doi.org/10.1016/j.apsusc.2010.09.044
@article{Maxisch_Ebbert_Torun_Fink_de los Arcos_Lackmann_Maier_Grundmeier_2011, title={PM-IRRAS studies of the adsorption and stability of organophosphonate monolayers on passivated NiTi surfaces}, volume={257}, DOI={10.1016/j.apsusc.2010.09.044}, number={6}, journal={APPLIED SURFACE SCIENCE}, author={Maxisch, M. and Ebbert, Christoph and Torun, B. and Fink, N. and de los Arcos, T. and Lackmann, J. and Maier, H. J. and Grundmeier, Guido}, year={2011}, pages={2011–2018} }
Maxisch, M., Christoph Ebbert, B. Torun, N. Fink, T. de los Arcos, J. Lackmann, H. J. Maier, and Guido Grundmeier. “PM-IRRAS Studies of the Adsorption and Stability of Organophosphonate Monolayers on Passivated NiTi Surfaces.” APPLIED SURFACE SCIENCE 257, no. 6 (2011): 2011–18. https://doi.org/10.1016/j.apsusc.2010.09.044.
M. Maxisch et al., “PM-IRRAS studies of the adsorption and stability of organophosphonate monolayers on passivated NiTi surfaces,” APPLIED SURFACE SCIENCE, vol. 257, no. 6, pp. 2011–2018, 2011.
Maxisch, M., et al. “PM-IRRAS Studies of the Adsorption and Stability of Organophosphonate Monolayers on Passivated NiTi Surfaces.” APPLIED SURFACE SCIENCE, vol. 257, no. 6, 2011, pp. 2011–18, doi:10.1016/j.apsusc.2010.09.044.

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