Alkylsilanes, self-assembled

Sugimura H, Ushiyama K, Hozumi A, Takai O (2000) Micropatteming of alkyl- and fluoro-alkylsilane self-assembled monolayers using vacuum ultraviolet light. Langmuir 16 885-888... 

Alkanethiolate or alkylsilane self-assembled monolayers (SAMs) 108-115 110-116... 

Figure C3.2.4. Plot of the log of photocurrent against number of methyl units in a alkylsilane based monolayer self-assembled on a n silicon electrode. The electrode is immersed in a solution witli an electron donor. Best fits of experimental data collected at different light intensities ( ) 0.3 mW cm ( ) 0.05 mW cm. From [10].

Xiao, X. D., Hu, J., Chayuch, D. H., and Salmeron, M., Chain Length Dependence of the Frictional Properties of Alkylsilane Molecules Self-Assembled on Mica Studied by Atomic Force Microscopy," Z,angmmr,Vol. 12,1996, pp. 235-240. 

FIG. 26 Schematics for creating a microscopic spot of immobilized enzymatic activity by localized derivatization of self-assembled monolayers according to (A) GOx on an patterned gold alkanethiolate layer and (B) diaphorase on alkylsilanized glass. (Part A from Ref. 21. Copyright 1997 American Chemical Society. Part B from Ref. 91. Copyright 1997 American Chemical Society.)... 

Self assembled monolayers (SAMs) have aroused wide spread interest as they provide an opportunity to define the chemical functionality of surfaces with molecular precision, thus creating potential applications related to the control of wettability, biocompatibility and the corrosion resistance of surfaces of a wide range of materials II), Two families of SAMs have received the most attention, SAMs of alkanethiols on gold and alkylsilanes on silicon. 

Xiao, X., Hu, J., Chatych, D.H., Salmeron, M. Chain length dependence of the frictional properties of alkylsilane molecules self-assembled on mica studied by atomic force microscopy. Langmuir 12, 235-237 (19%)... 

Early work on the macroscopic friction of SAM films was carried out by DePahna and others using a pin-on-disk type friction tester, and they observed a low friction coefficient [1,13] however, their frictional property containing a wear resistance was demonstrated under a limited condition. For example, the self-assembled octadecyltrichlorosilane monolayer revealed a good wear resistance at low load [14], but failed to lubricate at a normal load of 1.0 N due to wear [15]. To overcome the poor wear resistance of thin films, a dual-layer film was prepared by a combination of aminoalkylsilane and stearic acid, which improved the wear resistance of the SAM film [16]. In this work, the authors also proposed a defect-free double layer on a flat substrate by chemical adsorption of alkylsilane compound. 

Ito Y, Virkar AA, Mannsfeld S, Oh JH, Toney M, Locklin J, Bao Z (2009) Crystalline ultrasmooth self-assembled monolayers of alkylsilanes for organic field-effect transistors. J Am Chem Soc 131 9396-9404... 

The growth of alkylsiloxane self-assembled multilayers (SAMs) has been performed by sequential growth under vacuum of C=C terminated alkylsilane and titanium hydroxide with ozone activation (see Fig. 4.27). The XPS investigation... 

Self-assemblies of small molecules on glass and metal surfaces have been demonstrated in numerous motifs with alkanol and alkanoic acids,(77) alkylsilanes,(72) disulfides and thiols,(7i,74) and isonitriles.(75) Zircpnium... 

Surface modification and preparation on substrate have been reported to improve coating adhesion. For instance, premodification of the polyimide surface with self-assembled alkylsilane monolayers induced anisotropic lateral growth of PPy films along the substrate surface and enhanced film adhesion [76]. In this work, PPy film was electrochemically deposited onto Pt microelectrodes on a polyimide substrate and the PPy-coated microelectrode was used in external stimulation of cultured cardiac myocytes. 

Typical SAMs, such as alkanethiols reacted with gold and alkylsilanes reacted with silica, have been studied extensively, as demonstrated by numerous reports in the literature/ Studies of the properties of n-alkanoic acids reacted with oxidized aluminium" and alkyl phosphonic acids with tantalum oxide" ° surfaces can also be found in the literature. However, although some information is available in the literature on the behaviour of phosphonic acid SAMs, " which are one of the important classes of self-assembling organic molecules on a range of metal oxide surfaces, there is not much information reported on phosphonate SAMs on Cu in the public domain. " SAMs can be formed on various surfaces such as nickel oxide, copper oxide, iron oxide, etc. 

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