Biomedical subjects

Wayne M Saslow

Publications and source records attributed to Wayne M Saslow.

3 recordsLinked to original sources

PubMed2005

Long-range many-body polyelectrolyte bridging interactions.

We investigate polyelectrolyte bridging interactions mediated by charged, flexible, polyelectrolyte chains between fixed cylindrical macroions of opposite charge in a two-dimensional hexagonal crystalline array. We show that in the asymptotic regime of small macroion density, the polyelectrolyte-mediated attraction is long range, falling off approximately linearly with the macroion array density. We investigate the polyelectrolyte free energy as a function of the macroion density and derive several analytic limiting laws valid in different regimes of the parameter space.

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PubMed2003

Universal thermal radiation drag on neutral objects.

We compute the force on a small neutral polarizable object moving at velocity v--> relative to a photon gas equilibrated at a temperature T. We find a drag force linear in v-->. Its physical basis is related to that in recent formulations of the dissipative component of the Casimir force, i.e., the change in photon momentum in emission and absorption between the moving body and the stationary thermal bath. We estimate the strength of this universal drag force for different dielectric response functions and comment on its relevance in various contexts, especially to radiation-matter coupling in the cosmos.

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PubMed2003

Nonlinear voltage profiles and violation of local electroneutrality in ordinary surface reactions.

It is normally assumed that ordinary surface reactions, which involve no charge transfer between the surface and electrolyte, have no effect on voltage. The present work shows, on the contrary, that nontrivial voltage profiles can be produced by ordinary surface reactions. Poisson's equation then implies a nonzero bulk charge density, so that local electroneutrality is violated. The specific system considered is a planar lead-acid cell, but the results apply more generally, so long as the electrolyte charge-carrier diffusivities are not all the same. For slow steady reactions the carrier fluxes vary linearly across the cell, which produce linearly varying electric field and density gradients. As a consequence the voltage profile varies quadratically, and the volume charge density is nonzero and uniform. This result has broad implications (e.g., to steady-state oxygen loading of high T(c) materials) and may provide a contributing mechanism for the origin of the electric fields observed during biological growth.

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