DIELECTRIC-RELAXATION SPECTRA FOR N,N-DIMETHYLACETAMIDE-WATER MIXTURES USING PICOSECOND TIME DOMAIN REFLECTOMETRY

Using time domain reflectometry technique dielectric study has been carried out in the thirteen different mixtures of aqueous solutions of N,N-Dimethylacetamide (DMA). The static dielectric constant (epsilon-0), dielectric constant at high frequency (epsilon-infinity) and relaxation time (tau) have been obtained at various temperature. The relaxation in these systems can be described by the Davidson-Cole model. The Thermodynamic properties and Arrhenius behaviour of the system are also reported. The values of excess dielectric properties as a function of concentration of water suggest the disapperance of dimers or trimers and leaving behind monomers by addition of water in DMA.