On The Structure Of Suspensions Of Charged Rodlike Particles
TRENDS IN COLLOID AND INTERFACE SCIENCE V(1991)
摘要
Structural properties of colloidal suspensions of charged rodlike particles are studied by computer simulation and several
perturbation theory schemes. As a model for the interaction, we consider a repulsive screened Coulomb potential between two
interaction centers on each rod. — MonteCarlo simulations were performed for both the dilute (cL
3) and the semidilute (c>1/L
3) regimes. Results for the pair correlation function, the static structure factor S
M
(k) and the angular correlation of rod axes were obtained. It turns out that the concentration dependence of the peak position
of S
M
(k) shows a shift from a c
1/3-dependence in dilute suspensions to a c
1/2 behavior for higher concentrations as observed in light scattering experiments on suspensions of rodlike viruses. — In applying
perturbation theory the full interaction potential is expanded with respect to a spherically symmetric reference potential.
The latter has been determined according to several averaging schemes: mean potential, median potential, reference averaged
Mayer potential (RAM) and the blip function method. A comparison of the results of these schemes with simulation data shows
that perturbation theory provides a good description of the structure of this system only in the dilute regime.
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关键词
MACROMOLECULAR SOLUTIONS, RODLIKE PARTICLE, STATISTICAL THEORY OF LIQUID STRUCTURE, COMPUTER SIMULATION
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