Probe diffusion in an aqueous polyelectrolyte solution

摘要: Using the technique of fluorescence photobleaching recovery, we have measured tracer diffusion coefficients probe particles in aqueous solutions polystyrene sulfonate at various ionic strengths. Data were fit well by expression D/D0=exp[−acν’], where D is coefficient polymer concentration c, D0 absence polymer, and a ν’ are familiar scaling parameters. The parameter ranged from maximum 1.0 for conditions with intersegment interaction (low salt, high‐molecular weight, high‐charge density) to minimum about 0.5 high‐salt, low‐charge density cases. showed little sensitivity charge or strength but was strong function size. No discontinuities analytical parameters observed under any solution conditions, even though experimental variations included that expected correspond tra...