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Publications - 1984


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Nuclear magnetic resonance in heterogeneous systems

T. Cosgrove
University of Bristol, Bristol, UK

Nucl. Magn. Reson. (1984), 13 318-47

Abstract

A review, with 263 refs., including adsorbed systems, solid-state systems, geol. systems, biol. systems, and membranes.

Hydrodynamic thickness of adsorbed polymer layers

M.A. Cohen Stuart, F.H.W.H. Waajen, T. Cosgrove, B. Vincent and T.L. Crowley
Lab. Phys. Colloid Chem., Wageningen, Netherlands

Macromolecules (1984), 17(9), 1825-30

Abstract

Hydrodynamic thicknesses of adsorbed polymer layers were calcd. on the basis of a porous layer model using segment d. profiles calcd. with the Scheutjens-Fleer adsorption theory. Comparisons of the mol. wt. and adsorbed amt. dependence of the hydrodynamic thickness are made with exptl. data obtained by photon correlation spectroscopy on a system of polystyrene latex particles dispersed in aq. poly(ethylene oxide) solns. Tails play a very important role in the screening of the adsorbed layer from the flow field.

Segment density profiles of adsorbed polymers

T. Cosgrove, B. Vincent, T.L. Crowley and M.A. Cohen Stuart
University of Bristol, Bristol, UK

ACS Symp. Ser. (1984), 240(Polym. Adsorpt. Dispersion Stab.), 147-59

Abstract

Segment d. profiles and hydrodynamic thickness measurements were made for a polyethylene glycol (mol. wt. 2.5 × 103-1.3 × 106) adsorbed on polystyrene latex in the plateau region of the adsorption isotherm. At high mol. wts. the hydrodynamic thickness occurs at the extremity of the d. profile. Comparison with a theor. model based on solvent flow through a porous layer shows that, although the d. profile and the hydrodynamic thickness results are consistent, the exptl. profile is not sensitive enough to detect the low concn. of segments in tails at large distances from the interface. This is confirmed by further theor. calcns. based on the lattice model for an adsorbed polymer proposed by J.M.H.M. Scheutfens and C.J.J. Fleer (1979).

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