Combined quartz crystal microbalance with dissipation (QCM-D) and generalized ellipsometry (GE) to characterize the deposition of titanium dioxide nanoparticles on model rough surfaces

Negin Kananizadeh, Charles Rice, Jaewoong Lee, Keith B. Rodenhausen, Derek Sekora, Mathias Schubert, Eva Schubert, Shannon Bartelt-Hunt, Yusong Li

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Measuring the interactions between engineered nanoparticles and natural substrates (e.g. soils and sediments) has been very challenging due to highly heterogeneous and rough natural surfaces. In this study, three-dimensional nanostructured slanted columnar thin films (SCTFs), with well-defined roughness height and spacing, have been used to mimic surface roughness. Interactions between titanium dioxide nanoparticles (TiO 2 NP), the most extensively manufactured engineered nanomaterials, and SCTF coated surfaces were measured using a quartz crystal microbalance with dissipation monitoring (QCM-D). In parallel, in-situ generalized ellipsometry (GE) was coupled with QCM-D to simultaneously measure the amount of TiO 2 NP deposited on the surface of SCTF. While GE is insensitive to effects of mechanical water entrapment variations in roughness spaces, we found that the viscoelastic model, a typical QCM-D model analysis approach, overestimates the mass of deposited TiO 2 NP. This overestimation arises from overlaid frequency changes caused by particle deposition as well as additional water entrapment and partial water displacement upon nanoparticle adsorption. Here, we demonstrate a new approach to model QCM-D data, accounting for both viscoelastic effects and the effects of roughness-retained water. Finally, the porosity of attached TiO 2 NP layer was determined by coupling the areal mass density determined by QCM-D and independent GE measurements.

Original languageEnglish (US)
Pages (from-to)118-128
Number of pages11
JournalJournal of Hazardous Materials
Volume322
DOIs
StatePublished - Jan 15 2017

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Keywords

  • Engineered nanoparticles
  • Generalized ellipsometry
  • Nanoparticle deposition
  • Quartz crystal microbalance
  • Rough surfaces

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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