Transport and retention of colloids in porous media: Does shape really matter?

Megan B. Seymour, Gexin Chen, Chunming Su, Yusong Li

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The effect of particle shape on its transport and retention in porous media was evaluated by stretching carboxylate-modified fluorescent polystyrene spheres into rod shapes with aspect ratios of 2:1 and 4:1. Quartz crystal microbalance with dissipation (QCM-D) experiments were conducted to measure the deposition rates of spherical and rod-shaped nanoparticles to the collector (poly-l-lysine coated silica sensor) surface under favorable conditions. The spherical particles displayed a significantly higher deposition rate compared with that of the rod-shaped particles. Theoretical analysis based on Smoluchowski-Levich approximation indicated that the rod-shaped particles largely counterbalance the attractive energies due to higher hydrodynamic forces and torques experienced during their transport and rotation. Under unfavorable conditions, the retention of nanoparticles in a microfluidic flow cell packed with glass beads was studied with the use of laser scanning cytometry (LSC). Significantly more attachment was observed for rod-shaped particles than spherical particles, and the attachment rate of the rod-shaped particles showed an increasing trend with the increase in injection volume. Rod-shaped particles were found to be less sensitive to the surface charge heterogeneity change than spherical particles. Increased attachment rate of rod-shaped particles was attributed to surface heterogeneity and possibly enhanced hydrophobicity during the stretching process.

Original languageEnglish (US)
Pages (from-to)8391-8398
Number of pages8
JournalEnvironmental Science and Technology
Volume47
Issue number15
DOIs
StatePublished - Aug 6 2013

Fingerprint

Colloids
colloid
Deposition rates
Stretching
Porous materials
porous medium
Nanoparticles
Quartz crystal microbalances
Polystyrenes
Surface charge
Hydrophobicity
Microfluidics
Silicon Dioxide
Lysine
Aspect ratio
Torque
Hydrodynamics
Scanning
Glass
Lasers

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Transport and retention of colloids in porous media : Does shape really matter? / Seymour, Megan B.; Chen, Gexin; Su, Chunming; Li, Yusong.

In: Environmental Science and Technology, Vol. 47, No. 15, 06.08.2013, p. 8391-8398.

Research output: Contribution to journalArticle

Seymour, Megan B. ; Chen, Gexin ; Su, Chunming ; Li, Yusong. / Transport and retention of colloids in porous media : Does shape really matter?. In: Environmental Science and Technology. 2013 ; Vol. 47, No. 15. pp. 8391-8398.
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