Deposition of hematite particles on polypropylene walls in dynamic conditions

Čerović, Ljiljana S.; Lefèvre, Grégory; Jaubertie, Anne; Fédoroff, M.; Milonjić, Slobodan K.

doi:10.1016/j.jcis.2008.10.079

Cited by 20 publications

(10 citation statements)

References 37 publications

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“…It has been reported that HA can coat the surface of the nanoparticle thereby preventing aggregation through either electrostatic or steric interactions (Ghosh et al, 2010). Hematite nanoparticles have a point of zero charge (PZC) ranging from pH 5.5 to 9.5 depending on the method of synthesis and experimental conditions (Schwertmann et al, 2000; He et al, 2008; Cerovic et al, 2009; Shipley et al, 2010). At this pH of 5.5 to 9.5, the repulsive force between IONPs decreases due to the lack of charge on the IONPs surface resulting in aggregation of the particles.…”

Section: Resultsmentioning

confidence: 99%

Dispersion and stability of bare hematite nanoparticles: Effect of dispersion tools, nanoparticle concentration, humic acid and ionic strength

Dickson

Liu

et al. 2012

Science of The Total Environment

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The aggregation and sedimentation of iron oxide nanoparticles (IONPs) can significantly affect the mobility and reactivity of IONPs and subsequently influence the interaction between IONPs and environmental contaminants. Dispersing bare IONPs into a stable suspension within nanoscale range is an important step for studying the interaction of IONPs with contaminants (e.g., toxic metals). In this study, different techniques to disperse bare IONPs (vortex, bath sonication and probe ultrasonication) and the effects of important environmental factors such as dissolved organic matter and ionic strength on the stability of IONPs dispersions were investigated. Vortex minimally dispersed IONPs with hydrodynamic diameter outside the “nanosize range” (698–2400nm). Similar to vortex, bath sonication could not disperse IONPs efficiently. Probe ultrasonication was more effective at dispersing IONPs (50% or more) with hydrodynamic diameters ranging from 120–140 nm with minimal changes in size and sedimentation of IONPs for a prolonged period of time. Over the course of 168 hours, considerable amounts of IONPs remained dispersed in the presence and absence of low ionic strength (0.1 mM of NaCl) and 100 mg/L of humic acid (HA). These results indicate that IONPs can be broken down efficiently into “nanosize range” by probe ultrasonication and a degree of stability can be achieved without the use of synthetic modifiers to enhance colloidal stability. This dispersion tool could be used to develop a laboratory method to study the adsorption mechanism between dispersed bare IONPs and toxic contaminants.

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Section: Resultsmentioning

confidence: 99%

Dispersion and stability of bare hematite nanoparticles: Effect of dispersion tools, nanoparticle concentration, humic acid and ionic strength

Dickson

Liu

et al. 2012

Science of The Total Environment

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“…Even if reducing conditions are maintained in the secondary circuit, a better knowledge of iron oxide speciation could improve our understanding of the numerous phenomena that occur in such circuits. 33 Hence, the optimization of secondary circuit operation relies partially on obtaining more detailed information regarding the kinetics of magnetite oxidation under alkaline and low solute hydrothermal conditions from 25 C to 275 C, which are not covered by the available published studies.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and kinetics of magnetite oxidation under hydrothermal conditions

Chanéac

Berger

et al. 2019

RSC Adv.

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“…This approach has been successfully used in several model systems [2,15,22], and it could be also applied to predict the behavior of activated corrosion products in the primary cooling circuit of PWR. The zeta potential of corrosion products in physico-chemical conditions close to those of primary circuit (high temperature, high pressure, presence of boron) have been previously determined [5,20].…”

Section: Resultsmentioning

confidence: 99%