Clustering Mechanism Of Ethanol-Water Mixtures Investigated With Photothermal Microfluidic Cantilever Deflection Spectroscopy
SCIENTIFIC REPORTS(2016)
Abstract
The infrared-active (IR) vibrational mode of ethanol (EtOH) associated with the asymmetrical stretching of the C-C-O bond in pico-liter volumes of EtOH-water binary mixtures is calorimetrically measured using photothermal microfluidic cantilever deflection spectroscopy (PMCDS). IR absorption by the confined liquid results in wavelength dependent cantilever deflections, thus providing a complementary response to IR absorption revealing a complex dipole moment dependence on mixture concentration. Solvent-induced blue shifts of the C-C-O asymmetric vibrational stretch for both anti and gauche conformers of EtOH were precisely monitored for EtOH concentrations ranging from 20-100% w/w. Variations in IR absorption peak maxima show an inverse dependence on induced EtOH dipole moment (mu) and is attributed to the complex clustering mechanism of EtOH-water mixtures.
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Key words
Chemical physics,Sensors and biosensors,Science,Humanities and Social Sciences,multidisciplinary
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