Details
| Original language | English |
|---|---|
| Pages (from-to) | 2011-2018 |
| Number of pages | 8 |
| Journal | Applied surface science |
| Volume | 257 |
| Issue number | 6 |
| Publication status | Published - 29 Sept 2010 |
| Externally published | Yes |
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 CH 2 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.
Keywords
- NiTi alloy, Organophosphonic acid, PM-IRRAS, Self-assembled monolayer
ASJC Scopus subject areas
- Chemistry(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
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In: Applied surface science, Vol. 257, No. 6, 29.09.2010, p. 2011-2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - PM-IRRAS studies of the adsorption and stability of organophosphonate monolayers on passivated NiTi surfaces
AU - Maxisch, M.
AU - Ebbert, C.
AU - Torun, B.
AU - Fink, N.
AU - De Los Arcos, T.
AU - Lackmann, J.
AU - Maier, H. J.
AU - Grundmeier, G.
PY - 2010/9/29
Y1 - 2010/9/29
N2 - 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 CH 2 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.
AB - 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 CH 2 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.
KW - NiTi alloy
KW - Organophosphonic acid
KW - PM-IRRAS
KW - Self-assembled monolayer
UR - http://www.scopus.com/inward/record.url?scp=78650293246&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2010.09.044
DO - 10.1016/j.apsusc.2010.09.044
M3 - Article
AN - SCOPUS:78650293246
VL - 257
SP - 2011
EP - 2018
JO - Applied surface science
JF - Applied surface science
SN - 0169-4332
IS - 6
ER -