TY - JOUR
T1 - Deposition of titanium dioxide nanoparticles onto engineered rough surfaces with controlled heights and properties
AU - Kananizadeh, Negin
AU - Li, Jaewoong
AU - Mousavi, Ehsan S.
AU - Rodenhausen, Keith B.
AU - Sekora, Derek
AU - Schubert, Mathias
AU - Bartelt-Hunt, Shannon
AU - Schubert, Eva
AU - Zhang, Jianmin
AU - Li, Yusong
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/6/20
Y1 - 2019/6/20
N2 - 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 (Al 2 O 3 -Si-SCTF, SiO 2 -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 TiO 2 NP deposition was observed on flat, silica-coated QCM-D sensors or rough, 100 nm thick SiO 2 -Si-SCTF. TiO 2 NP deposition onto Al 2 O 3 -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), TiO 2 NP 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.
AB - 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 (Al 2 O 3 -Si-SCTF, SiO 2 -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 TiO 2 NP deposition was observed on flat, silica-coated QCM-D sensors or rough, 100 nm thick SiO 2 -Si-SCTF. TiO 2 NP deposition onto Al 2 O 3 -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), TiO 2 NP 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.
KW - Generalized ellipsometry
KW - Nanoparticle deposition
KW - Quartz crystal microbalance with dissipation
KW - Slanted columnar thin films
KW - Surface roughness
KW - Titanium dioxide nanoparticle
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U2 - 10.1016/j.colsurfa.2019.03.088
DO - 10.1016/j.colsurfa.2019.03.088
M3 - Article
AN - SCOPUS:85063755881
SN - 0927-7757
VL - 571
SP - 125
EP - 133
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
ER -