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Deposition of titanium dioxide nanoparticles onto engineered rough surfaces with controlled heights and properties
Univ Nebraska, NE 68588 USA; Clemson Univ, SC 29625 USA.
Natl Inst Environm Res, South Korea.
Clemson Univ, SC 29634 USA.
Univ Nebraska, NE 68588 USA; Univ Nebraska, NE 68588 USA.
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2019 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 571, p. 125-133Article in journal (Refereed) Published
Abstract [en]

Understanding the influence of surface roughness on the deposition of nanoparticles is important to a variety of environmental and industrial processes. In this work, slanted columnar thin films (SCTFs) were engineered to serve as an analogue for rough surfaces with controlled height and surface properties. The deposition of titanium dioxide nanoparticles (TiO(2)NPs) onto alumina-or silica-coated SCTFs (Al2O3-Si-SCTF, SiO2-Si-SCTF) with varying heights (50 nm, 100 nm, and 200 nm) was measured using a combined quartz crystal microbalance with dissipation monitoring (QCM-D) and generalized ellipsometry (GE) technique. No TiO2NP deposition was observed on flat, silica-coated QCM-D sensors or rough, 100 nm thick SiO2-Si-SCTF. TiO2NP deposition onto Al2O3-Si-SCTFs in ultra-pure water was significantly higher than on the flat alumina-coated QCM-D sensor, and deposition increased as the roughness height increased. The nanoparticle attachment was sensitive to the local flow field and the interaction energy between nanoparticles and the QCM-D sensor. At a higher ionic strength condition (100 mM NaCl), TiO2NP aggregates with varying sizes formed a rigid layer on top of SCTFs. For the first time, deposition of nanoparticles was measured as a function of roughness height, and the impact of roughness on the properties of the attached nanoparticle layers was revealed. This finding indicates that key parameters describing surface roughness should be explicitly included into models to accurately predict the transport of nanoparticles in the subsurface.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 571, p. 125-133
Keywords [en]
Titanium dioxide nanoparticle; Nanoparticle deposition; Slanted columnar thin films; Quartz crystal microbalance with dissipation; Surface roughness; Generalized ellipsometry
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URN: urn:nbn:se:liu:diva-158045DOI: 10.1016/j.colsurfa.2019.03.088ISI: 000466612200016OAI: oai:DiVA.org:liu-158045DiVA, id: diva2:1330176
Note

Funding Agencies|Center for Nanohybrid Functional Materials [NSF-EPS-10004094]; NSF [EAR-1521428]; ACS Petroleum research fund PRF [59374-ND5]; National Science Foundation [ECCS: 1542182]; Nebraska Research Initiative

Available from: 2019-06-25 Created: 2019-06-25 Last updated: 2019-06-25

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Schubert, Mathias
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Semiconductor MaterialsFaculty of Science & Engineering
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