Hydrophilic/hydrophobic features of TiO2 nanoparticles as a function of crystal phase, surface area and coating, in relation to their potential toxicity in peripheral nervous system

Bolis, V.; Busco, C.; Ciarletta, Monica; Distasi, Carla; Erriquez, Jessica; Fenoglio, Ivana; Livraghi, Stefano; Morel, Silvia

doi:10.1016/j.jcis.2011.11.058

Cited by 99 publications

(80 citation statements)

References 85 publications

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“…Further, aggregations derived from rutile TiO 2 NPs show better suspensions stability and dispersibility than those from anatase TiO 2 NPs (see Table 2). The result was also noticed previously in deionized water as well as in PBS (Braydich-Stolle et al 2009;Bolis et al 2012). This finding confirms the fact that aggregations of TiO 2 NPs depend on crystal structures, which is relating to surface charges, atom arrangement and architectural feature of TiO 2 NPs.…”

Section: Discussionsupporting

confidence: 90%

Effects of humic acid and ionic strength on TiO2 nanoparticles sublethal toxicity to zebrafish

Fang

Zhang

et al. 2015

Ecotoxicology

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The stability and bioavailability of titanium dioxide nanoparticles (TiO 2 NPs) suspension could be modified by the physicochemical properties of solution. In the present study, the effect of humic acid (HA) and ionic strength (by adding NaCl) on aggregation and sedimentation of TiO 2 NPs suspension were investigated. Accordingly, the sublethal toxicity of TiO 2 NPs suspensions with different HA and NaCl concentrations toward zebrafish (Danio rerio) was evaluated by monitoring the changes of superoxide dismutase, catalase, malonaldehyde and glutathione in gill, liver and intestine. The results showed that the aggregations formation and hydrodynamic diameter of TiO 2 NPs in suspensions are not essential characteristics to decide toxicity. The varied oxidative stress responses detected in gill, liver and intestine derived from different toxicity mechanisms of TiO 2 NPs. Nevertheless, the oxidative stress could be suppressed by the adding of HA and/or the increase of ionic strength, which can decrease the bioavailability of TiO 2 NPs in water. The study suggests that the environmental factors, such as HA and ionic strength, are important for the fate (aggregation and sedimentation) and toxicity of nanomaterials in aquatic environment.

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Section: Discussionsupporting

confidence: 90%

Effects of humic acid and ionic strength on TiO2 nanoparticles sublethal toxicity to zebrafish

Fang

Zhang

et al. 2015

Ecotoxicology

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“…27,28 Usually, anatase phase is more hydrophilic in nature than rutile phase. 29 The TiO 2 NPs hydrophilic nature also enhances the possibility of sticking of TiO 2 NPs on surface of the SiNWs. Hence with the presence of TiO 2 NPs on the surface of SiNWs, the hydrophilicity of SiNWs increases.…”

mentioning

confidence: 99%

Charge injection and trapping in TiO2 nanoparticles decorated silicon nanowires arrays

Rasool

Rafiq

Ahmad

et al. 2015

Applied Physics Letters

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We investigate carrier transport properties of silicon nanowire (SiNW) arrays decorated with TiO2 nanoparticles (NPs). Ohmic conduction was dominant at lower voltages and space charge limited current with and without traps was observed at higher voltages. Mott’s 3D variable range hoping mechanism was found to be dominant at lower temperatures. The minimum hopping distance (Rmin) for n and p-SiNWs/TiO2 NPs devices was 1.5 nm and 0.68 nm, respectively, at 77 K. The decrease in the value of Rmin can be attributed to higher carrier mobility in p-SiNWs/TiO2 NPs than that of n-SiNWs/TiO2 NPs hybrid device

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“…The small, if not negligible, extent of catalyst entrainment may be explained by the strong adhesion of the P25 TiO 2 with the borosilicate glass, brought about by the use of ethanol as a carrier of the TiO 2 suspension [18]. Due to the hydrophilic property of P25 TiO 2 [20], the photocatalyst strongly adhered to the surface of the borosilicate glass, aided by the ethanol carrier.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Design of an Air-Sparged Tubular Photocatalytic Reactor for the Degradation of Methylene Blue: Mass-Transfer Limitation Studies

Ramoso

Dalida

2016

MATEC Web of Conferences

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Abstract. An alternative process for the removal of organic pollutants in aqueous systems is photocatalysis. The challenges hindering its industrial use are electron-hole recombination and mass-transfer limitations. In order to address these problems, the objective of this study is to introduce air by sparging, and design an air-sparged photocatalytic reactor using titanium dioxide immobilized on borosilicate glass. The performance of the reactor on the removal of the model pollutant, methylene blue (MB), was evaluated and compared against the reactor operated without sparging. The effect of mass-transfer limitations on reactor performance was also investigated by regression using a Langmuir-type model equation. The sparged photocatalytic reactor was able to degrade 57% MB in 2 hours, an improvement of 40% compared to no sparging, and is comparable to similar reactors in literature, but with the advantage of using less expensive materials of construction and simpler immobilization technique. Mass-transfer limitation studies showed a good fitting of the initial reaction rate r, with r = 0.1399Q / (0.6120 + Q) for the sparged operation, and Q is the volumetric flowrate of water (L/min). The model also shows that the reactor operates near the reaction-limited regime, and that the extent of mass-transfer limitation effects was reduced by the present reactor.

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Hydrophilic/hydrophobic features of TiO2 nanoparticles as a function of crystal phase, surface area and coating, in relation to their potential toxicity in peripheral nervous system

Cited by 99 publications

References 85 publications

Effects of humic acid and ionic strength on TiO2 nanoparticles sublethal toxicity to zebrafish

Effects of humic acid and ionic strength on TiO2 nanoparticles sublethal toxicity to zebrafish

Charge injection and trapping in TiO2 nanoparticles decorated silicon nanowires arrays

Design of an Air-Sparged Tubular Photocatalytic Reactor for the Degradation of Methylene Blue: Mass-Transfer Limitation Studies

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