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- W2969375784 abstract "A dramatic improvement is reported in the stability of colloidal particles when stabilizing surface grafts are systematically shortened from small polymers to single monomers. The colloidal dispersions consist of fluorinated latex particles, exhibiting a weak van der Waals attraction, with grafted steric layers of poly(ethylene glycol) (PEG) of different chain lengths. Using an effective salting-out electrolyte, Na2CO3, particle aggregates are detected above a threshold salt concentration that is independent of the particle concentration. The results are interpreted in terms of a sudden onset of nondispersibility of single particles, triggered by the solvent not completely wetting particle surfaces. By decreasing the PEG chain length, the threshold salt concentration is found to increase sharply. For grafts with just a single ethylene glycol group, dispersions remain stable up to exceedingly high concentrations of Na2CO3. However, on removal of the surface coverage altogether, the classical stability behavior of charge-stabilized dispersions is recovered. The behavior can be captured by a simple model that incorporates effective polymer-solvent interactions in the presence of an electrolyte." @default.
- W2969375784 created "2019-08-29" @default.
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- W2969375784 date "2019-08-20" @default.
- W2969375784 modified "2023-09-23" @default.
- W2969375784 title "Stabilizing Colloidal Particles against Salting-out by Shortening Surface Grafts" @default.
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- W2969375784 doi "https://doi.org/10.1021/acs.langmuir.9b02093" @default.
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