The kinetics of macroscopic swelling is described by the equation of Peters and Candau, with values of collective diffusion coefficients being in good agreement with values obtained by other workers via photon correlation spectroscopy.
Measurements are reported of the swelling pressure ω and of the collective diffusion coefficient Dc in two series of salt-free neutralized polyelectrolyte gels, one a poly acrylamide acrylic acid) copolymer, the other cross-linked potassium polyacrylic acid.
In quasi-elastic light scattering, the collective diffusion coefficient D0was measured in the dilute concentration range (c = 0.1 wt.%).
Our work provides evidence for the growth based on collective diffusion of lipid molecules in hydrophilic solution [ 36, 37].
By computing the mean square displacement (MSD) of n,, the collective diffusion constant can be obtained [ 30]: (6) in units of t-1, leading to the single-channel osmotic permeability constant p f[ 30].
We review recent work which is relevant to this field, which includes experiments and simulation of nucleation and growth in surfactant systems, information on self and collective diffusion processes, and work on interfacial instabilities such as myelins.
A novel variational analytic approach to collective diffusion allowing the density dependent collective diffusion coefficient to be calculated in systems of interacting particles adsorbed on a crystalline substrate is presented.
Decrease in Itr was modelled using the Li–Tanaka equation from which time constants, τ1, and collective diffusion coefficients, Do were determined for various Bis content PAAm gels.
From the slope, the effective collective diffusion coefficients [D eff] were determined.
The fast mode is the collective diffusion (gel mode), while the slow mode is attributed to the diffusion of clusters.
