Stable TiO2 dispersions for nanocoating preparation

Veronovski, Nika; Andreozzi, Patrizia; Mesa, Camillo La; Sfiligoj-Smole, Majda

doi:10.1016/j.surfcoat.2009.09.041

Cited by 47 publications

(21 citation statements)

References 32 publications

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“…Nanoparticle stability can be defined as an even distribution of particles throughout the whole volume and the ability of the particles to stay separated from each other with time (Veronovski et al, 2010). However, it is also important that the particle size remain consistent for nanoparticle stability as aggregation to larger particles affects their mobility and reactivity.…”

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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“…Most of the literature studies have focused on ways to stabilize TiO 2 particles against agglomeration [6][7][8][9][10][11][12][13][14][15][16] by using surfactants or polymers as dispersants. When a dispersant adsorbs on the particles surface, it affects the electrostatic interactions and often introduces additional long-range steric interactions.…”

Section: Introductionmentioning

confidence: 99%

Effect of sodium dodecylsulfate monomers and micelles on the stability of aqueous dispersions of titanium dioxide pigment nanoparticles against agglomeration and sedimentation

Yang

Kelkar

Zhu

et al. 2015

Journal of Colloid and Interface Science

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“…Circular dichroism gives information on biopolymer conformation. Electrophoretic mobility is a powerful tool to investigate colloid dispersions and may give significant information on the charge distribution around polymers, latexes, powders, silica or titania nano-particles, nanotubes [20,21], proteins, DNA and many other biologically relevant molecules. Very presumably, the interactions between biopolymers and nanotubes imply significant changes at interfaces, with subsequent modifications in the electrical double layer surrounding colloid particles in water [22].…”

Section: Introductionmentioning

confidence: 99%