Trimethoxysilyl

The formation of covalent bonds between resin molecules in a coating and the surface of the substrate can enhance adhesion. Thus, adhesion to glass is promoted by reactive silanes having a trimethoxysilyl group on one end that reacts with a hydroxyl group on the glass surface. The silanes have... 

Another technique that has proved useful in establishing chemical bonding of coupling agents at interfaces is inelastic electron tunneling spectroscopy (ITES). For example. Van Velzen [16] examined 3-(trimethoxysilyl)propanethiol by this technique. Approximately monolayer quantities of this silane were adsorbed on the barrier oxide of an aluminum-aluminum oxide-metal tunneling junction two metals were investigated, lead and silver. It was concluded that the silane is... 

Magnesium hydroxide (provided from Skynics), with average particle size of 50 nm, was dried at 110 U under vacuum for 24 h prior to use. 3-(Trimethoxysilyl) propyl methacrylate... 

The dinuclear isonitrile and alkoxycarbene complexes 6 and 7 were obtained from [Fe(CO)3( X-dppm) Tl2- j,2-Si(OMe)2(OMe))PtCl] by chloride substitution with isonitriles and 3-butyne-l-ol (or ( )-4-pentyne-2-ol), respectively [2], In these complexes, the organic ligand bound to Pt only occupies one coordination site, thus allowing the trimethoxysilyl ligand to display a T 2- i2-Si-0 bonding mode. 

These Ru(H)bpy32+ fluorescent silica nanoparticles were used to detect single bacterial cells using antibodies conjugated to the surface after functionalization with trimethoxysilyl-propyldiethylenetriamine followed by succinylation to create carboxylates. Specific antibody molecules against E. coli 0157 then were coupled to this modified fluorescent particle using the carbodiimide method with EDC and NHS (Zhao et al., 2004). 

The following protocol for modification of silica nanoparticles is based on the method of Zhao et al. (2004), which describes the addition of amine functionalities using trimethoxysilyl-propyldiethylenetriamine. Other functional silane modifications may be done similarly. 

Add 32 mg of silica nanoparticles (fluorescent or plain) to 20 ml of 1 mM acetic acid containing 1 percent trimethoxysilyl-propyldiethylenetriamine with stirring. Other concentrations of silane derivatives used for particle modification typically range from 1 to 5... 

The effects of organosilane type on the VB1 release are large and show that for tablets coated twice and dried at 60 °C, the samples coated with bis(trimethoxysilyl)hexane (TSH), bis(triethoxysilyl)octane (TSO), bis (trimethoxysilylpropyl)amine (TSPA) and bis[3-(trimethoxysilyl)propyl]-ethylenediamine (enTMOS) give slower release than the other samples including uncoated mesoporous silica used for a comparison (Figure 2.16). 

Plots in Figure 6.3 show leaching and response of pH sensor layers chemically doped starting from 3-(trimethoxysilyl)propylisocyanate (ICPS) and (glycidyloxypropyl)trimethoxysilane (GOPS) derivatized with the pH indicator AF, or physically doped in SiC>2 (from tetra-methylorthosilicate, TMOS) and in 50% phenyl-modified silica. 

Another way of getting around the problem of the separation of the catalyst from the substrate is via use of a flow reactor [38], Supercritical carbon dioxide has been used successfully as a medium for the hydroformylation of 1-octene using an immobilized rhodium catalyst. The catalyst is covalently fixed to silica through the modifying ligand A-(3-trimethoxysilyl-n-propyl)-4,5-bis(diphenylphosphino)phenoxazine (Figure 8.13). Selectivity was found to be... 

Abbreviations TMOS tetramethoxysilane, MTMS methyl-triethoxysilane, Cjg-TMSPAC octadecyldimethyl [3-(trimethoxysilyl)propyl] ammonium chloride, PheDMS phenyldimethylmethoxysilane, TEOS tetraethoxysilane, Cg-TEOS -octyltriethoxysilane, APTES aminopropyltri-ethoxysilane, PTES phenyltriethoxysilane, allyl-TrMOS allyltriethoxysilane, DOS diglycerylsilane, Cg-TMOS n-octyltrimethoxysilane. 

FIGURE 8.6 SEM of an organo-silica hybrid monolith prepared with the precursor A-octadecyldimethyl[3-(trimethoxysilyl)propyl] ammonium chloride to provide reversed phase stationary phase and anodic EOF. (a) Cross-sectional view (magnification 1800 times) and (b) longitudinal view (magnification 7000 times). (Reprinted from J. D. Hayes, A. Malik, Anal. Chem., 72 4090 (2000). With permission. Copyright American Chemical Society 2000.)... 

Scheme 12.1.6 Synthesis of trimethoxysilyl-terminated polyt maleic anhydridc-siyrene) and modification of colloidal silica with the polymer.

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