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Stabilizing Colloidal Particles against Salting-out by Shortening Surface Grafts

Artikel i vetenskaplig tidskrift
Författare Kristin Jonsson
Jeanette Ulama
Rasmus Persson
Malin Zackrisson Oskolkova
Michael Sztucki
Theyencheri Narayanan
Johan Bergenholtz
Publicerad i Langmuir
Volym 35
Nummer/häfte 36
Sidor 11836−11842
ISSN 0743-7463
Publiceringsår 2019
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 11836−11842
Språk en
Länkar https://doi.org/10.1021/acs.langmui...
Ämnesord colloids, small-angle X-ray scattering, colloidal stability, PEG, steric stabilization, aggregation, wetting
Ämneskategorier Yt- och kolloidkemi

Sammanfattning

A dramatic improvement is reported in the stability of colloidalparticles 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.

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