Reduced colloidal repulsion imparted by adsorbed polymer of particle dimensions

Journal of Colloid and Interface Science
Yu Ho WenTai-Chou Lee

Abstract

This work investigated the detailed interparticle interactions in a concentrated polymer-coated colloidal system in which the bare colloidal particles and the adsorbed polymers are of comparable size and, hence, the polymer adsorption cannot be foreseen to induce repulsive or attractive interactions. Specifically, poly(ethylene oxide) (PEO) chains (R(g) approximately 10nm) adsorbed onto fine silica colloidal particles (SAXS-determined radius approximately 7.4nm; width of log-normal size distribution approximately 0.28) were considered as a model system, for which the impact of a small amount of polymer adsorption (0.18mg/m(2)) in controlling the interactions of the PEO-coated silica particles was systematically explored by analyzing the small-angle X-ray scattering (SAXS) data against three interaction potentials-the equivalent hard-sphere (EHS) potential, the Hayter-Penfold-Yukawa (HPY) potential, and the square-well (SW) potential. Moreover, the SAXS analysis was enforced by dynamic light scattering (DLS) for predetermining the adsorption behavior, as well as for evaluating the possibility of polymer bridging. Under a dilute condition, the DLS analysis showed no sign of forming colloidal multiplets. In concentrated dispersion...Continue Reading

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Citations

Mar 13, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·S Connor DennisCory J Berkland
Mar 19, 2013·The Journal of Physical Chemistry. B·Gema MarceloJosé Paulo S Farinha
Sep 26, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Catherine L CooperStuart W Prescott
Jan 5, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Zilin WangSimone Wiegand

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