Surface reactions on thin layers of silane coupling agents

Journal Article · Mon Nov 01 00:00:00 EST 1993 · Langmuir; (United States)

DOI:https://doi.org/10.1021/la00035a039· OSTI ID:5481480

Kurth, D G; Bein, T ^[1]

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1. Purdue Univ., West Lafayette, IN (United States)

The reactivity of immobilized functional groups in thin layers of (3-aminopropyl)triethoxysilane (APS), (3-mercaptopropyl)trimethoxysilane, (3-bromopropyl)trimethoxysilane, and (8-bromooctyl)trimethoxysilane on oxidized aluminum substrates was studied with reflection-adsorption infrared spectroscopy (RAIR), optical ellipsometry and contact-angle measurements. Mass changes on the surface associated with the surface-confined reactions were measured with the quartz crystal microbalance (QCM). Single layers of (3-aminopropyl)triethoxysilane on oxidized aluminum react with chlorodimethylsilane to give [(-O)[sub 3]Si(CH[sub 2])[sub 3]NH[sub 2][sup +]SiMe[sub 2]H]Cl[sup [minus]] and single layers of (3-mercaptopropyl)trimethoxysilane on oxidized aluminum react with phenylmercury hydroxide to give [(-O)[sub 3]Si(CH[sub 2])[sub 3]SHgPh], while no substitution reaction of (3-bromopropyl)trimethoxysilane and (8-bromooctyl)trimethoxysilane monolayers occurred with cyanide. Films of APS were further utilized to immobilize pepsin. It is discussed to which extent known reactions from solution can be transferred to interface reactions. 50 refs., 8 figs., 5 tabs.

• OSTI ID: 5481480
• Journal Information: Langmuir; (United States), Vol. 9:11; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
SILANES
CHEMICAL REACTIONS
ADSORPTION
ALUMINIUM
CYANIDES
ELLIPSOMETRY
INFRARED SPECTRA
MERCURY COMPOUNDS
MICROBALANCES
PEPSIN
THIN FILMS
WETTABILITY
ACID PROTEINASES
BALANCES
ELEMENTS
ENZYMES
FILMS
HYDRIDES
HYDROGEN COMPOUNDS
HYDROLASES
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
PEPTIDE HYDROLASES
PROTEINS
SILICON COMPOUNDS
SORPTION
SPECTRA
WEIGHT INDICATORS
400201* - Chemical & Physicochemical Properties
400102 - Chemical & Spectral Procedures