Viscosity of interfacial water - art. no. 096104

The effective shear viscosity and frequency-dependent dynamic oscillatory s hear spectra of water containing monovalent or divalent ions (ionic strengt h 25 mM), confined between mica crystals at 1-2 water molecules thickness, oscillated with twist angle with the period expected for the pseudohexagona l surface lattice. The effective viscosity varied by orders of magnitude as the twist angle was changed. Confinement appeared to imprint lateral spati al correlation on the ultrathin liquid, the more so the better the confinin g lattices were aligned, but the oft-proposed "ice structure" was not obser ved dynamically.