Electrolyte-induced Instability of Colloidal Dispersions in Nonpolar Solvents

Publikation: Bidrag til tidsskriftTidsskriftartikelfagfællebedømt

Dokumenter

  • Gregory N. Smith
  • Samuel D. Finlayson
  • Sarah E. Rogers
  • Paul Bartlett
  • Julian Eastoe
Dispersions of poly(methyl methacrylate) (PMMA) latexes were prepared in a low dielectric, nonpolar solvent (dodecane) both with and without the oil-soluble electrolyte, tetradodecylammonium-tetrakis(3,5-bis(trifluoromethyl)phenyl)borate. For dispersions with a high concentration of background electrolyte, the latexes become colloidally unstable and sediment in a short period of time (<1 h). This is completely reversible upon dilution. Instability of the dispersions is due to an apparent attraction between the colloids, directly observed using optical tweezers by bringing optically trapped particles into close proximity. Simple explanations generally used by colloid scientists to explain loss of stability (charge screening or stabilizer collapse) are insufficient to explain this observation. This unexpected interaction seems, therefore, to be a consequence of the materials that can be dispersed in low dielectric media and is expected to have ramifications for studying colloids in such solvents.
OriginalsprogEngelsk
TidsskriftThe Journal of Physical Chemistry Letters
Vol/bind8
Udgave nummer19
Sider (fra-til)4668-4672
Antal sider5
ISSN1948-7185
DOI
StatusUdgivet - 30 aug. 2017
Eksternt udgivetJa

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