Abstract
The diffusion behavior of both the anionic surfactant sodium dodecyl sulfate and gelatin have been studied by pulsed-gradient spin-echo NMR spectroscopy (PGSE-NMR) in aqueous solutions at 44 °C, well above the setting temperature. The studies were made as a function of both surfactant and gelatin concentration for two different lime-processed gelatin samples: one the standard photographic material, the other a fractionated sample. Above c*, the fractionated and standard gelatins exhibit different behavior in both the presence and absence of SDS. Adding SDS slows the diffusion of the gelatin, which passes through a minimum with increasing surfactant concentration. The diffusion data are compared to light scattering, small-angle neutron scattering and viscosity data from similar systems. An isotherm characterizing the SDS binding to the gelatin has been derived from the self-diffusion data.
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