By Tsetska Radeva
An exam of the elemental nature of polyelectrolytes, static and dynamic houses of salt-free and salt-added strategies, and interactions with different charged and impartial species at interfaces with purposes to and drugs. It applies the city Monte Carlo simulation to calculate counterion distributions, electrical potentials, and fluctuation of counterion polarization for version DNA fragments.
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Extra resources for Physical Chemistry of Polyelectrolytes
The scattering signal at these concentrations is, however, very weak. Consequently light scattering data in this concentration range are sparse. Krause et al. 7 ϫ 10Ϫ4 g/L (Figure 16). The work was focused on larger q. Measured angular dependencies were well fitted by a single-chain form factor assuming a coillike chain conformation. The data were also compared to the calculated rod form factor, but very poor agreement was obtained. It was concluded that the chains are quite far from the fully extended conformation.
The concentration and molecular weight independence of the fast diffusion coefficient in the semidilute regime D ϳ c 0M 0w was theoretically derived by explicitly considering triple screening for coupled dynamics of ionic species associated with electrostatic, excluded volume, and hydrodynamic interactions . On the other hand, a dilute–semidilute transition can be clearly recognized in scattering data obtained at high cs . The overall picture is similar to neutral polymers. In the dilute regime, the diffusion coefficient is weakly dependent on concentration and strongly dependent on molecular weight.
The difference between the excess scattering with and without previous dialysis can in most cases be neglected. What cannot be neglected are differences between refractive index increments measured at constant salt concentration and constant chemical potential of the salt (differences between the constants K and K*). If samples are not dialyzed and refractive index increments are measured only at constant salt concentration, then apparent rather than true molecular weights are measured. According to Eqs.