Γ-aminopropyl Triethoxysilane Research Articles

Immobilization of phospholipids on silicon, platinum, indium/tin oxide and gold surfaces with characterization by x-ray photoelectron spectroscopy and time-of-flight secondary-ion mass spectrometry

Simple procedures are described for the covalent binding of phospholipids to silicon, platinum, indium/tin oxide and gold surfaces. The protocol for the first three surfaces consists of silanization with γ-amino propyltriethoxysilane, followed by reaction of the amino function with a derivative of a long-chain aliphatic dicarboxylic acid used as a cross-linker and treatment with a lyso-lipid. The seposition of a lipid on gold emplys the reactivity of a sulphur substituent at the terminus on one of the acyl chains of the lipid. Surface coverages ranging from 60 to 75% are obtained as deduced from elemtnal determinations and N(1 s)-to-P(2 p binding energy peak ratios obtained in x-ray photoelectron spectroscopic study of the immobilized species. Functional group determinations were done through a high-resolutions of the C(1 s peaks together with comparison of spectra from intermediate surface structures. Depth profiling of the lipid-bound silicon surface through argon ion etching indicated a model involving the orientation of the sn-2 chain perpendicular to the surface plane. The molecular structure of the immobilized lipid on silicon is established by positive and negative time-of-flight secondary-ion mass spectrometry.

シランカップリング処理した亜鉛‐シリカ複合めっき皮膜の耐食性

The effect of treatment with γ-aminopropyltriethoxy silane (γ-APS) on the corrosion resistance of zinc-silica composite which was electroplated onto mild steel substrate has been studied by salt spray testing, measurement of spontaneous electrode potential in concert with contact angle to water, and FT-IR spectroscopy. Composite surface roughness was regulated with the aid of surfactants in the bath. The red rusting time of non γ-APS treated composite containing 3.6wt% of 0.018μm silica particles was found to be 1200hr, which corresponds to about twelve times the salt spray resistance of the pure and fan-shaped zinc electroplate of the same mean thickness. A red rusting time of 2800hr was recorded when the same sample was treated with γ-APS solution. Spontaneous electrode potential measurement of the nontreated composite showed that a protective film is formed on the composite surface in 5% NaCl solution. The excellent red rusting resistance of the treated composite is ascribed to formation of a chemically fixed hydrophobic layer on the composite surface.

Adhesion Behavior of PIQ to Si/SiO2 Surfaces

AbstractThe present paper reports the results of an investigation of the adhesion characteristics of PIQ13, an isoindaloquin-azolinedione-modified polyimide, to silicon wafers. The wafers were used both untreated and pretreated with a layer of CVD SiO2. Also investigated was the adhesion behavior of a condensation-type polyimide, P15878. A comparison is made between the behavior of the PIQ with two different coupling agents, an aluminum chelate (Coupler 3) and γ-aminopropyltriethoxy silane (A-1100). Superior adhesion performance of the A-1100 is indicated; and with A-1100, the adhesion of the two resins is similar.

The effect of silane coupling agent and microfiller on the strength of phenol-formaldehyde resin concrete

Phenol-formaldehyde resin-quartzite aggregate composites have been investigated for the effect of silane coupling agent (γ-aminopropyltriethoxy silane) and a microfiller, CaCO 3, on their compressive strength. The integral blend additive method of application of the coupling agent was used in the preparation of samples. Both silane and microfiller additives have been seen to facilitate bonding between resin and the aggregates and consequently result in improved strength. Infrared studies have indicated that silane bonds chemically with siliceous aggregates.

Efficiency of some silane coupling agents and of the method of their application in polyester resin concrete

The effects of two silane coupling agents, γ-methacryloxy propyl trimethoxy silane and γ-amino propyl triethoxy silane, on the compressive strength of polyester resin concrete (PC) is studied by using two methods of application of the coupling agent, namely by (a) pre-treatment of the aggregates in an aqueous solution of the silane, (b) by adding the silane to the resin as an integral blend additive. The performance of the two methods, evaluated in terms of gain in the compressive strength, is compared. Method (b), which is preferable due to its convenience, showed comparable performance to method (a) only at the optimum level of loading of the coupling agent. Changes in X-ray diffraction of “PC with coupling agent” prepared by method (b) were similar to those in silane-treated sand particles, which support the migration theory of the coupling agent reported in the literature. Grain size analysis of silane-treated sand showed evidence of better aggregation in the presence of one coupling agent as compared to the other.

Effect of silane coupling agents on mechanical and thermal properties of polyester resin concrete

Polyester resin-quartzite aggregate composites have been investigated for the effect of two silane coupling agents (γ-aminopropyl triethoxy silane andγ-methacryloxy propyl trimethoxy silane) on the mechanical and thermal properties. The integral blend additive method of application of the coupling agent was used in the preparation of the samples. Variation of the thermal stability and the compressive strength with the nature and the content of the silane coupling agent were quite consistent. The properties showed maxima around a certain value of the coupling agent content, which is suggested as the optimum value. Results are also presented on the samples containing an additional filler, namely, the CaCO3.

Separation of carbohydrates by liquid chromatography on silica gel, adding adsorption modificators to the eluent

For the separation of carbohydrates by liquid chromatography, utilizing the intermolecular interaction with amino groups on the surface of the adsorbent, two types of adsorbents were used: silica gel modified by adding to the eluent a diamine, and a chemically bonded phase prepared by the reaction of γ-aminopropyl triethoxy silane with silica gel. Mono- di- and trisaccharides could be separated on silica gel modified by the adsorption of piperazin and ethylene diamine from the eluent. The separation capacity of columns packed with silica gel with bonded NH2 groups and with silica gel having diamines adsorbed on its surface is similar. The retention volumes of 15 carbohydrates were measured on columns containing silica gel with hydroxylated surface and on silica gel modified with piperazin from the eluent consisting of acetone-water. Comparison of acetone-water and acetonitrile-water as the eluent showed that the former is also suitable for the analysis of carbohydrates.