Physics – Condensed Matter
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jpcm...19k6102a&link_type=abstract
Journal of Physics: Condensed Matter, Volume 19, Issue 37, pp. 376102 (2007).
Physics
Condensed Matter
Scientific paper
Dielectric measurements were carried out for mixtures of Triton X-100 (TX, a nonionic detergent with a poly(ethylene oxide) chain) and water with or without electrolytes over a frequency range of 1 MHz to 10 GHz to study the structure and dynamics of water molecules in the mixtures. Dielectric relaxation was found above 100 MHz, being assigned to the dielectric relaxation of water. The intensity of the dielectric relaxation was proportional to the water content above 0 °C. Below the freezing temperature of bulk water, the relaxation intensity decreased at TX concentrations (CTX) below 50 wt% at -10 °C and below 60 wt% at -20 °C because frozen water shifts the dielectric relaxation to a frequency region far below 1 MHz. This indicated that there is no bulk water at CTX above 50 wt% and that at least two water molecules per ethylene oxide (EO) unit are tightly associated with the ethylene oxide chain. The low-frequency conductivity of the mixtures of TX and electrolyte solutions was well represented by Bruggeman's mixture equation at CTX below 40 wt%, if two water molecules per EO unit form an insulating shell surrounding TX micelles.
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