Abstract
The dielectric relaxation of water— n-butoxyethanol mixtures has been studied as a function of alcohol concentration in the water-rich region by means of a frequency domain coaxial technique in the range 10 MHz—3 GHz. Both the static dielectric constant and dielectric relaxation time exhibit an anomalous behaviour which further supports the existence of a butoxyethanol microphase above a critical concentration (mole fraction of cosolvent X*=0.026 at T=2°C). Experimental data have been analyzed in terms of a simple model in which water molecules are divided in two main groups, hydration and bulk water, mutually exchanging at a finite rate.
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