Dynamics of supercooled water in mesoporous silica matrix MCM-48-S

Using three different quasielastic neutron spectrometers with widely different resolutions, we have been able to study the microscopic translational and rotational dynamics of water, in a mesoporous silica matrix MCM-48-S, from T=300 K to 220 K, with a single consistent model. We formulated our fitting routine using the relaxing cage model. Thus, from the fit of the experimental data, we extracted the fraction of water bound to the surface of the pore, the characteristic relaxation times of the long-time translational and rotational decays, the stretch exponent describing the shape of the relaxation processes, and the power exponent determining the Q-dependence of the translational relaxation time. A tremendous slowing down of the rotational relaxation time, as compared to the translational one, has been observed.     

Scheinbare Viskosität von menschlichem Gesamtblut bei verschiedenen hydrostatischen Drucken. I. Untersuchungen an mit antikoagulierender Substanz versetztem Blut unter Verwendung eines neuen Kapillarviskosimeters

Ohne Zusammenfassung     

Non-linear pressure dependence of phonon frequencies in RbI

The frequencies of a representative sample of phonons with negative Grueneisen parameters, in RbI, were measured at several pressures up to, and slightly above, the thermodynamic equilibrium pressure between the NaCl and CsCl structure phases (3.56 kbar). In general the frequency-pressure curves are linear up to about 3 kbar but show a tendency to saturate around 3.5 kbar.