Nanoscale Dynamics and Transport in Highly Ordered Low-Dimensional Water

Abstract

Highly ordered and highly cooperative water with properties of both solid and liquid states has been observed by means of neutron scattering in hydrophobic one-dimensional channels with van der Waals diameter of 0.78 nm. We have found that in the initial stages of adsorption water molecules occupy niches close to pore walls, followed later by the filling of the central pore area. Intensified by confinement, intermolecular water interactions lead to the formation of well-ordered hydrogen-bonded water chains and to the onset of cooperative vibrations. On the other hand, the same intermolecular interactions lead to two relaxation processes, the faster of which is the spontaneous position exchange between two water molecules placed 3.2–4 Å from each other. Self-diffusion in an axial pore direction is the result of those spontaneous random exchanges and is substantially slower than the self-diffusion in bulk water.

Probing Water Diffusion Inside Crystals of AlPO‐5 by PFG NMR and IRM for Heat Storage Applications

“…The excess powder was filtered and washed with deionized water. An additional batch of AlPO-5 crystals were prepared according to procedure described in [24] for NMR experiments to check reproducibility of diffusion data and having possibility to compare it with already reported diffusivities obtained by quasielastic neutron scattering elsewhere (QENS) [25] on the same kind of aluminophosphates. AlPO-5 powder was synthesized following the synthesis procedure of [26].…”

Dynamics in hydrated inorganic nanotubes studied by neutron scattering: towards nanoreactors in water

“…In IMO-CH 3 , the shoulder detected around 6 meV is assigned to transverse collective modes due to intermolecular OOO bending. 30,34,35 An extreme connement limits the amplitude of this motion, thus the intensity of this spectral line. Indeed, as pointed out by the water adsorption simulations (Fig.…”

Monitoring the CO2 enhanced oil recovery process at the nanoscale: an in situ neutron scattering study

“…19 In addition, inelastic (or quasielastic) neutron scattering techniques are also essential tools to reveal the dynamics of fluids confined in porous materials. 20,21 The total neutron scattering method provides unique information about the structure of disordered materials containing light elements. In general, disorder disrupts the perfect periodicity or the long-range order of crystalline materials that gives rise to Bragg scattering.…”

“…19 In addition, inelastic (or quasielastic) neutron scattering techniques are also essential tools to reveal the dynamics of fluids confined in porous materials. 20,21…”