Apparent micelle molecular weights, intrinsic viscosity, actual frictional coefficients and molal volumes have been determined for benzethonium chloride (BZCl) at 20°C in 0.01 M Tris-HCI, containing 0.01 M NaC1. The weight average molecular weight of BZCl was determined to 28000+ 1 500 by static light scattering, revealing an apparent aggregation number (ATapp) of 60-65. Average hydrodynamic dimensions of the BZCl micelle were obtained from measurements of sedimentation velocity, intrinsic viscosity and of the mutual diffusion coefficient above the CMC ( 8 . 4~ mol/l). By studying the autocorrelation function of light scattering of BZCl solutions above the CMC, the hydrodynamic and thermodynamic perturbations were determined. The dynamics of the micellar BZCl solutions are unperturbated by additions of polyhydric alcohols within the range of 10-40% (w/w). Above the CMC a classical hard-sphere behavior is derived from the volume fraction dependence of the scattered intensity for BZCI.The diffusivity data are consistent with a micellar hydrodynamic radius, R, of 25.5 A , with little or no growth of BZCl micelles upon increasing surfactant concentration evident between 0.01 M NaCl and 0.1 M NaCl at pH 7.5 (20°C).Applying the linear interaction theory we obtained theoretical fits to Dapp vs. BZCl concentrations over a region of low salt concentrations at pH 7.5 (20°C).
The fractal dimensions of colloidal particles of copper hydrous oxides in the presence of natural occurring anionic exopolymers are reported from measurements using both small‐angle X‐ray‐ and static light scattering techniques. The power law decay of the structure factor [S(k) ∼ k −D] of colloidal copper hydrous oxides dispersions can be explained in terms of fractal geometry. D is found to be 2.15 ± 0.05 for Cu(OH)2, and for colloidal Cu2O·x H2O aggregates a value of 1.75 ± 0.07 was determined.
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