The low frequency anelastic properties of CDW compounds near the Peierls phase transition are studied in a forced sub-resonant pendulum suitable for delicate (TaSe,), I samples. The influence of measurement parameters such as frequency, oscillation amplitude, temperature rate and low temperature cycles, are obtained. The principal effects found are : the Peierls transition, a higher temperature...

We consider the equilibrium relaxation properties of the end-to-end distance and of the principal components in a one-dimensional polymer chain model with nonlinear interaction between the beads. While for the single-well potentials these properties are similar to the ones of a Rouse chain, for the double-well interaction potentials, modeling internal friction, they differ vastly from the ones ...

Nanosecond laser T-jump was used to measure the viscosity dependence of the folding kinetics of the villin subdomain under conditions where the viscogen has no effect on its equilibrium properties. The dependence of the unfolding/refolding relaxation time on solvent viscosity indicates a major contribution to the dynamics from internal friction. The internal friction increases with increasing t...

Using aMarx-oscillator standing-wave resonancemethod, we measuredthe internal friction &' of sintered titanium containing up to 26 volume-percent voids (c). The surprising &I-versus-c curve shape, an exponential increase, lead us to remeasure &I-versus-c by acoustic-resonance spectroscopy, which gave similar results. We hypothesized that both void shape and void size change with c. For the void...

Conductive polymer fibers have the potential to take electronics to the molecular scale by allowing current to pass along a single molecule. Unfortunately, their use has been limited by difficulty in determining their mechanical properties. It is the goal of this research to develop a technique for measuring the internal friction of conductive polymer fibers. Unfortunately, I was not able to us...