Dielectric Spectroscopy of Aqueous TRIS Buffer Solutions at Microwave Frequencies

The dielectric properties of typical tris(hydroxymethyl)aminomethane (TRIS) solutions have been measured and modeled using a Cole-Cole model in the frequency range 200 MHz up to 20 GHz. The physics of the dielectric behavior of TRIS solutions have been discussed and the effect of TRIS molecules on the permittivity of the aqueous medium have been investigated by theoretical models. To facilitate reproduction and use of the data and to provide interpolated values at concentrations other than those used for measurements, closed form polynomial expressions have been developed for the Cole-Cole model parameters. The data can be useful in the design and analysis of experiments in bioelectromagnetics, where they can be used to more precisely theoretically estimate the field strength in the solutions under exposure.

Keywords:

Complex permittivity , TRIS , tris(hydroxymethyl)aminomethane , Microwave frequencies