Maxisch, Michael

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Maxisch, Michael - Technik/Chemische Technik

  • In-situ-FTIR-spectroscopic studies of organic acid monolayers on metal oxides in humid environments

    In-situ-FTIR-spectroscopic studies of organic acid monolayers on metal oxides in humid environments

    Ab: 45,80 €
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    Maxisch, Michael. A new in-situ setup combining ultra-high vacuum (UHV), plasma application, modern photoelastic-modulated-infrared-reflection-absorption-spectroscopy (PM-IRRAS) and quartz crystal microbalance (QCM) was developed to analyze the formation and stability of selfassembled monolayers (SAMs) on engineering metals in detail. At first the adsorption behaviour of different organophosphonic acids on nickel-titanium (NiTi) shape memory alloy (SMA) were analysed. PM-IRRAS prove that the binding mechanism is based on a mono- or bidental bond. In addition it was shown that an alkyl chain length of 17 CH2 groups is required for the formation of a SAM, which is stable in aqueous environment. Furthermore in-situ measurements were undertaken to determine the formation, the barrier properties and the stability under high water activities of octadecylphosphonic acid (ODPA) and nonadecanoic acid (NDA) SAMs. PM-IRRAS reveal the self-assembly of both molecules on oxyhydroxid...