Polymer bridging probed by magnetic colloids.

Time and distance dependence of reversible polymer bridging followed by single-molecule force spectroscopy.

Polymer bridging between surfaces plays an important role in a range of fundamental processes in the material and life sciences. Bridges formed by main-chain reversible polymers differ from their covalent analogs in that they can dynamically adjust their size and shape in response to external stimuli and have the potential to reform following bond scission. In this work, the time and distance d...

Mixed Interfullerene Bonding Motifs in C60 based polymers

An unexpected discovery in fullerene chemistry has been the ease with which C60 units can covalently bond together to give rise to polymerized fullerene networks with a variety of structural architectures. Such fullerene-bridged arrays display varying dimensionality and interesting electronic (metallic behavior) and magnetic (ferromagnetism above room temperature) properties. The predominant C-...

Uniform directional alignment of single-walled carbon nanotubes in viscous polymer flow.

In this work, we probed the effects of shear flow on the alignment of dispersed single-walled carbon nanotubes in polymer solutions. Two different systems were compared: Single-walled carbon nanotubes dispersed using an anionic surfactant and single-walled carbon nanotubes dispersed using an anionic surfactant and a weakly binding polymer. It was determined that the addition of the weakly bindi...

The cage elasticity and under-field structure of concentrated magnetic colloids probed by small angle X-ray scattering

Nonlinear dynamics of confined polymer melts with attractive walls.

A scaling model is presented to analyze the reversible strain-hardening phenomenon in end-tethered polymer clay nanocomposites (Krishnamoorti, R.; Giannelis, E. P. Langmuir 2001, 17, 1448). It is assumed that for attractive clay-polymer interactions a fraction of the polymer chains that span the space between opposite clay plates get adsorbed on them, thereby bridging the plates. Under large am...