Abstract
We formulate low-frequency charge-fluctuation forces between charged cylinders, parallel or skewed, in salt solution. At high-salt concentrations, forces are exponentially screened. In low-salt solutions, dipolar fluctuation energies go as or ; monopolar energies vary as or , where is the minimal separation between cylinder axes. The most important result is not the derivation of long-sought pair potentials but rather the demonstration that pairwise summability of rod-rod ion-fluctuation forces is easily violated under low-salt conditions.
- Received 27 June 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.1560
©1998 American Physical Society