Effect of high roughness on a long aging time of superhydrophilic TiO2 nanoparticle thin films

Thongsuwan, Wiradej; Kumpika, Tewasin; Singjai, Pisith

doi:10.1016/j.cap.2011.03.002

Cited by 43 publications

(30 citation statements)

References 36 publications

(18 reference statements)

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“…However, Al-Kattan et al found similar matrix-bound particles in leaching studies with paints containing nano-TiO 2 and nano-SiO 2 (Al- Kattan et al, 2013Kattan et al, , 2014Kattan et al, , 2015. Kaegi et al found a similar result when investigating Ag ENPs in aged paint, with some evidence from EDX analysis to suggest the formation/release of Ag 2 S. Depending on the nature of the TiO 2 ENPs (synthesis process, annealing), the "TiO 2 ENP film" can show super hydrophilic properties (Thongsuwan et al, 2011) that are susceptible to increase the surface degradation rate. These studies suggest that the behavior of ENP actually used in products is much more complex than the study of ENPs in water (Ottofuelling et al, 2011).…”

Section: Paints and Coatingsmentioning

confidence: 55%

Review of nanomaterial aging and transformations through the life cycle of nano-enhanced products

Mitrano

Motellier

Clavaguera

et al. 2015

Environment International

352

243

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In the context of assessing potential risks of engineered nanoparticles (ENPs), life cycle thinking can represent a holistic view on the impacts of ENPs through the entire value chain of nano-enhanced products from production, through use, and finally to disposal. Exposure to ENPs in consumer or environmental settings may either be to the original, pristine ENPs, or more likely, to ENPs that have been incorporated into products, released, aged and transformed. Here, key product-use related aging and transformation processes affecting ENPs are reviewed. The focus is on processes resulting in ENP release and on the transformation(s) the released particles undergo in the use and disposal phases of its product life cycle for several nanomaterials (Ag, ZnO, TiO2, carbon nanotubes, CeO2, SiO2 etc.). These include photochemical transformations, oxidation and reduction, dissolution, precipitation, adsorption and desorption, combustion, abrasion and biotransformation, among other biogeochemical processes. To date, few studies have tried to establish what changes the ENPs undergo when they are incorporated into, and released from, products. As a result there is major uncertainty as to the state of many ENPs following their release because much of current testing on pristine ENPs may not be fully relevant for risk assessment purposes. The goal of this present review is therefore to use knowledge on the life cycle of nano-products to derive possible transformations common ENPs in nano-products may undergo based on how these products will be used by the consumer and eventually discarded. By determining specific gaps in knowledge of the ENP transformation process, this approach should prove useful in narrowing the number of physical experiments that need to be conducted and illuminate where more focused effort can be placed.

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Section: Paints and Coatingsmentioning

confidence: 55%

Review of nanomaterial aging and transformations through the life cycle of nano-enhanced products

Mitrano

Motellier

Clavaguera

et al. 2015

Environment International

352

243

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“…This could be the effect of that the particles yet not covered all the substrate. Thus, the external electric field does not decrease at this point, as was mentioned in the previous paper [18]. If the lines of the deposition rates of films were continuous, they would approach each other and meet the line with the sparking process without applied ext .…”

Section: Resultsmentioning

confidence: 72%

“…The agglomeration or the sticking of particles to one another is a natural phenomenon of nanoparticles. Our previous papers [18,19], showed that the as-deposited particles produced by the spark- ing process are small with primary sizes of about 1-5 nm. Compared with those works, the primary sizes of particles could be still the same, because we use the same condition for the sparking process and improve only the applied external electric field.…”

Section: Methodsmentioning

confidence: 99%

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External-Electric-Field-Enhanced Uniformity and Deposition Rate of a TiO2 Film Prepared by the Sparking Process

et al. 2018

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We have used an external electric field to increase both the uniformity and deposition rate of TiO2 films. The experiment is carried out by sparking-off titanium wires with a high dc voltage of 1 kV (field int = 10 kV/cm) and a limited current of 3 mA. The external electric fields ( ext) of 3, 6, and 9 kV/cm were applied to the sparking system for 1-5 hours. The as-deposited film morphology was characterized by scanning electron microscopy. The results clearly show that the films are only deposited on the external electric field area. Furthermore, the deposition rate of the films increased from 40.7% to 77.8% in the presence of the external electric field of 9 kV/cm. The effects of an external electric field on both the deposition rate and uniformity of films are investigated and described. K e y w o r d s: TiO2 film, sparking process, external electric fields.

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“…3(b)), there are some pores and raised, crossed and white lines like veins on the film, where the depths of the pores are 1.22∼1.63 μm and the diameters are estimated to be 2.38∼6.21 μm. The thickness of film is approximately 4.73 μm, the width of vein about 2.15 μm and the R q is 0.5 μm which means that this film is rougher than other textured films previously reported [17]. A little farther away, about 1236 μm from the center (Fig.…”

Section: Resultsmentioning

confidence: 87%

Surface Texturing of TiO2 Film by Mist Deposition of TiO2 Nanoparticles

Qin

Watanabe

2013

Nano-Micro Lett.

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Unique and various microstructures of titanium oxide (TiO2) film including macroporous structure, chromatic veins and rings, have been easily fabricated by mist deposition method on silicon substrate with mild preparation conditions. Rutile phase TiO2 nanoparticles were directly used as starting material to prepare film and led to a simple preparation process. It was found that several different microstructures existed in the sample and changed with the varied positions from the center to the edge of the film when the concentration of the TiO2 suspension is 0.06 mol/l, the deposition time is 30 min, the flow rate is 1 l/min and the temperature is 150℃. The surface texturing shows apparent distinction as the concentration of the TiO2 suspension decreased to 0.03 mol/l and 0.01 mol/l.

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Effect of high roughness on a long aging time of superhydrophilic TiO2 nanoparticle thin films

Cited by 43 publications

References 36 publications

Review of nanomaterial aging and transformations through the life cycle of nano-enhanced products

Review of nanomaterial aging and transformations through the life cycle of nano-enhanced products

External-Electric-Field-Enhanced Uniformity and Deposition Rate of a TiO2 Film Prepared by the Sparking Process

Surface Texturing of TiO2 Film by Mist Deposition of TiO2 Nanoparticles

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