Structural phase transition of a dodecan-1-ol monolayer at the solid/liquid interface studied by sum-frequency spectroscopy
Abstract
IR visible sum-frequency spectroscopy (SFS) has been used to investigate the structural changes occurring in a dodecan-1-ol monolayer adsorbed on a model hydrophobic surface between 15 and 70 °C. Up to 40.5 °C, the SF spectrum of the monolayer shows predominantly terminal methyl resonances and very weak methylene chain resonances arising from a densely packed monolayer with a high degree of conformational order. Above 40.5 °C, there is a sharp decrease in the intensity of the methyl resonances and an increase in the methylene resonances, indicative of a surface phase transition. Modelling the resonance profiles shows that both monolayer coverage and conformational order decrease above the phase-transition temperature.
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