Octadecyltrimethoxysilane
Octadecyltrimethoxysilane (OTMS) is an organosilicon compound. This colorless liquid is used for preparing hydrophobic coatings and self-assembled monolayers. It is sensitive toward water, irreversibly degrading to a siloxane polymer.[1] It places a C18H39SiO3 "cap" on oxide surfaces. The formation of OTMS monolayers is used for converting hydrophilic surfaces to hydrophobic surfaces, e.g. for use in certain areas of nanotechnology and analytical chemistry.
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Names | |
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Preferred IUPAC name
Octadecyltrimethoxysilane | |
Systematic IUPAC name
Trimethoxy(octadecyl)silane | |
Other names
n-Octadecyltrimethoxysilane Trimethoxyoctadecylsilane | |
Identifiers | |
3D model (JSmol) |
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Abbreviations | OTMS |
5791830 | |
ChemSpider | |
ECHA InfoCard | 100.019.400 |
EC Number |
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MeSH | n-Octadecyltrimethoxysilane |
PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
C21H46O3Si | |
Molar mass | 374.681 g·mol−1 |
Appearance | Colorless liquid |
Density | 0.883 g cm−3 |
Melting point | 16 to 17 °C (61 to 63 °F; 289 to 290 K) |
Boiling point | 170 °C (338 °F; 443 K) |
Refractive index (nD) |
1.438-1.44 |
Hazards | |
Safety data sheet | |
EU classification (DSD) (outdated) |
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R-phrases (outdated) | R36, R37, R38 |
S-phrases (outdated) | S26, S36 |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Infobox references | |
References
- P. Fontaine; F. Rondelez (1995). J. Daillant; P. Guenoun; C. Marques; P. Muller; J. Tran Thanh Van (eds.). Kinetics of Polymerisation in Langmuir Monolayers of n-Alkyltrimethoxysilane. Short and Long Chains at Interfaces.
Further reading
- Hild, R; David, C; Müller, H. U; Völkel, B; Kayser, D. R; Grunze, M (1998). "Formation and Characterization of Self-assembled Monolayers of Octadecyltrimethoxysilane on Chromium: Application in Low-Energy Electron Lithography". Langmuir. 14 (2): 342–346. doi:10.1021/la970438l.
- Vidon, S; Leblanc, R. M (1998). "Langmuir Study of Octadecyltrimethoxysilane Behavior at the Air−Water Interface". The Journal of Physical Chemistry B. 102 (7): 1279–1286. doi:10.1021/jp973334s.
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