The attachment of colloidal particles to environmentally relevant surfaces and the effect of particle shape

Coy P. McNew, Negin Kananizadeh, Yusong Li, Eugene J. LeBoeuf

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Despite the prevalence of nonspherical colloidal particles, the role of particle shape in the transport of colloids is largely understudied. This study investigates the attachment of colloidal particles onto environmentally relevant surfaces while varying particle shape and ionic strength. Using quartz crystal microbalance and atomic force microscopy measurements, the role of particle shape was elucidated and possible mechanisms discussed. The attachment of both spherical and stretched polystyrene colloidal particles onto a smooth alginate-coated silica surface showed qualitative agreement with DLVO theory. Attachment onto a Harpeth humic acid (HHA) surface, however, significantly deviated from DLVO theory due to its high surface heterogeneity and extended confirmation from the silica surface. This extended confirmation provided increased potential for spherical particle entanglement, while the enlarged major axis of the stretched particles hindered their ability to attach. As ionic strength increased, the HHA layer condensed and provided less potential for spherical particle entanglement and therefore the selectivity for spherical particle attachment vanished. The findings presented in this study suggest that colloidal particle shape may play a complex and important role in predicting the transport of colloidal particles, especially in the presence of natural organic matter-coated surfaces.

Original languageEnglish (US)
Pages (from-to)65-79
Number of pages15
JournalChemosphere
Volume168
DOIs
StatePublished - Feb 1 2017

Fingerprint

Humic Substances
Silicon Dioxide
Osmolar Concentration
Quartz Crystal Microbalance Techniques
Atomic Force Microscopy
Polystyrenes
Colloids
Ionic strength
Silica
Quartz crystal microbalances
Alginate
Biological materials
humic acid
Particles (particulate matter)
effect
particle
Atomic force microscopy
silica
atomic force microscopy
alginate

Keywords

  • Attachment
  • Colloid shape
  • NOM
  • QCM-D
  • Transport

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

Cite this

The attachment of colloidal particles to environmentally relevant surfaces and the effect of particle shape. / McNew, Coy P.; Kananizadeh, Negin; Li, Yusong; LeBoeuf, Eugene J.

In: Chemosphere, Vol. 168, 01.02.2017, p. 65-79.

Research output: Contribution to journalArticle

McNew, Coy P. ; Kananizadeh, Negin ; Li, Yusong ; LeBoeuf, Eugene J. / The attachment of colloidal particles to environmentally relevant surfaces and the effect of particle shape. In: Chemosphere. 2017 ; Vol. 168. pp. 65-79.
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