Geometric versus energetic competition in light harvesting by dendrimers

Article Abstract:

Dendrimers posses a unique property that allows the preferred location of the excitation along the dendrimer structure to be controlled by adding an energetic funnel descending from the periphery to the center. This unique property offers a possibility for a controlled drive of photochemical processes in molecules or molecular groups located at the core of the dendrimer by tuning the temperature. The effective rate of capture of an excitation by an irreversible trap also depends on the dendrimer size, the coordination number, the nature of the funnel and initial conditions.

Molecular structure, Molecules

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Atomic scale friction and different phases of motion of embedded molecular systems

Article Abstract:

A minimalistic model is presented for studying various friction phenomena at the nanometer level such as stick-slip motion, intermittent stick-slip and transition to sliding above the critical velocity. New experimental tools have been developed for studying the behavior of confined molecules and macromolecules at the nanometer scale. For example, the surface force apparatus has been modified to study shear between two atomically flat solid surfaces separated by thin liquid layers.

Nanotechnology

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Looking at friction through 'shearons'

Article Abstract:

A new study investigates the shear response of a one-dimensional monolayer contained within two rigid plates, the upper one of which is externally driven. It is shown that the shear excites 'shearons', shear-induced collective modes excited in the embedded system with designated temporal and spatial patterns.

Monomolecular films, Shear (Mechanics)

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