ISSN:
0098-1273
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The Rayleigh linewidth Γ of light scattered by dilute aqueous solutions of polystyrene latex spheres has been measured by using time-dependent photocurrent signal correlation with a precision typically of 0.5-1% over a range of scattering angles θ. With independent measurements of the diffusion coefficient D from D = lim K → 0 (Γ/K2), the diameter of the sphere d by means of electron microscopy, and the hydrodynamic shear viscosity η, we have confirmed the Stokes-Einstein relation D = kT/3πηd to within 1% if we take into account the effect of polydispersity on our Rayleigh linewidth data. We also find that dEM = 907 ± 56 Å for sample LS-1132-B as reported by the Dow Chemical Company differs from our dSB = 847 (±1.6%) Å ≈ dEM = 851 (±2%) by about 7%, which is outside the limits of error of our experiments. The subscripts EM and SB denote electron microscope and self-beating, respectively, while K ≡ (4π/λ)sin(θ/2) is the magnitude of the momentum transfer vector.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1972.180101213
