Understanding water-membrane interactions is a fundamental issue in biophysics since these interactions are at the basis of many key molecular processes occurring in membranes. The hydrogen-bond network of water molecules is highly dynamic and its dynamical structure influences membrane fluidity and proton transport across membranes. We investigate the dynamics of water hydrogen-bonds network in model membranes using dielectric relaxation spectroscopy in the TeraHertz range. This frequency interval is suitable for obtaining information on the collective low-energy modes of the hydrogen-bond network of water molecules. In this paper we review the technique and present some preliminary experimental results.

Mol. Cryst. Liq. Cryst.
Ultrafast Spectroscopy

Paparo, D, Tielrooij, K.J, Bakker, H.J, & Bonn, M. (2009). TeraHertz dielectric relaxation of biological water confined in model membranes made of lyotropic phopholipids. Mol. Cryst. Liq. Cryst., 500, 108–117. doi:10.1080/15421400802713769