Orientationally ordered aggregates of stiff polyelectrolytes in the presence of multivalent salt
ArXiv 0901.1740 (2009)
Abstract:
Aggregation of stiff polyelectrolytes in solution and angle- and distance-dependent potential of mean force between two like-charged rods are studied in the presence of 3-valent salt using molecular dynamics simulations. In the bulk solution, formation of long-lived metastable structures with similarities to the raft-like structures of actin filaments is observed within a range of salt concentration. The system finally goes to a state with lower free energy in which finite-sized bundles of parallel polyelectrolytes form. Preferred angle and interaction type between two like-charged rods at different separations and salt concentrations are also studied, which shed some light on the formation of orientationally ordered structures.A frustrated non-contact rack-pinion-rack device
Journal of Physics: Conference Series 161 (2009)
Abstract:
A design is proposed for a mechanical device made of a nanoscale pinion sandwiched without contact between two racks that exert opposing forces rooted in the quantum fluctuations of the electromagnetic field via the lateral Casimir force. The built-in frustration in the design of the system helps it to react dramatically to minute changes in the geometrical features, which suggests that it could act as a good sensor. The noncontact nature of this device could help solve the infamous wear problem in nanoscale mechanical devices. © 2009 IOP Publishing Ltd.A frustrated non-contact rack-pinion-rack device
60 YEARS OF THE CASIMIR EFFECT 161 (2009) ARTN 012038
Directed single polymer diffusion along surface energy gradients
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 237 (2009)
Self-motile colloidal particles: From random walks to directed propulsion and chemotaxis
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 237 (2009)