The aggregation of silica and haematite particles dispersed in natural water samples

Findlay, Andrew; Thompson, D. W.; Tipping, Edward

doi:10.1016/0927-7757(96)03708-9

Cited by 33 publications

(21 citation statements)

References 25 publications

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“…In general, heteroaggregation is defined as the aggregation of dissimilar particles, which may differ in their size, shape, charge, chemical composition, and other properties . Heteroaggregation has been widely used in nonfood science applications for a variety of reasons, such as controlling the rheological properties of ceramics, creating ion‐exchange columns, removing colloidal particles from aqueous solutions, and encapsulating and targeting biomolecules . Heteroaggregation of oppositely charged particles through electrostatic attraction is the most commonly used method for most applications, and therefore this method will be the focus of this review.…”

Section: Principles Of Heteroaggregationmentioning

confidence: 99%

Modulation of food texture using controlled heteroaggregation of lipid droplets: Principles and applications

Mao

McClements

2013

J of Applied Polymer Sci

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This article reviews the development and potential application of novel food-grade materials based on heteroaggregation of oppositely charged particles. These particles typically consist of a hydrophobic lipid core and an electrically charged emulsifier shell. Heteroaggregation leads to the formation of emulsion-based products that are highly viscous or gel-like at much lower droplet concentrations than in nonaggregated systems. Heteroaggregation may therefore be useful for developing food products with novel textural characteristics or for creating reduced-calorie versions of full fat foods. We give an overview of the principles of heteroaggregation, the relationship between emulsion microstructure and texture, and possible commercial applications of this method.

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Section: Principles Of Heteroaggregationmentioning

confidence: 99%

Modulation of food texture using controlled heteroaggregation of lipid droplets: Principles and applications

Mao

McClements

2013

J of Applied Polymer Sci

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“…Previous studies also showed that the values of secondary minima in net interaction energy profiles decreased with decreasing particle sizes and that the aggregation of nanosized particles (which was irreversible) occurred mainly in the primary minima (43)(44)(45)(46). In addition, electrolytes and NOM in water can also affect the stability of colloidal particles by changing their surface charge and compressing their EDLs (37)(38)(39)(47)(48)(49)(50).…”

Section: Coagulationmentioning

confidence: 99%

Properties of Commercial Nanoparticles that Affect Their Removal During Water Treatment

Westerhoff

Zhang

Crittenden

et al. 2008

Nanoscience and Nanotechnology

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“…Understanding nanoparticle aggregation in the aqueous environment is critical for assessing the fate, transport and toxicity of nanomaterials [5] . Studies conducted in different aqueous media, including synthetic matrices [6] – [16] , natural waters [17] , [18] , and culture media [19] , [20] have indicate that pH, ionic strength [7] , [9] – [11] , nanoparticle concentration [10] , and natural organic matter [6] , [8] affect nanoparticle aggregation. However, questions such as how the sintered structure and the presence of clay minerals affect the aggregation process remain to be answered.…”

Section: Introductionmentioning

confidence: 99%

Increased Mobility of Metal Oxide Nanoparticles Due to Photo and Thermal Induced Disagglomeration

Zhou¹,

Bennett²,

Keller

2012

PLoS ONE

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Significant advances have been made on our understanding of the fate and transport of engineered nanomaterials. One unexplored aspect of nanoparticle aggregation is how environmental stimuli such as light exposure and temperature variations affect the mobility of engineered nanoparticles. In this study, TiO2, ZnO, and CeO2 were chosen as model materials for investigating the mobility of nanoparticles under three external stimuli: heat, light and sonication. Sunlight and high power sonication were able to partially disagglomerate metal oxide clusters, but primary particles bonded by solid state necks were left intact. A cycle of temperature increase from 25°C to 65°C and then decrease back was found to disagglomerate the compact clusters in the heating phase and reagglomerate them as more open fractal structures during the cooling phase. A fractal model summing the pair-wise DLVO interactions between primary particles within two fractal agglomerates predicts weak attractions on the order of a few kT. Our study shows that common environmental stimuli such as light exposure or temperature variation can disagglomerate nanoparticle clusters and enhance their mobility in open waters. This phenomenon warrants attention since it is likely that metal oxide nanoparticles will experience these natural stimuli during their transport in the environment.

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The aggregation of silica and haematite particles dispersed in natural water samples

Cited by 33 publications

References 25 publications

Modulation of food texture using controlled heteroaggregation of lipid droplets: Principles and applications

Modulation of food texture using controlled heteroaggregation of lipid droplets: Principles and applications

Properties of Commercial Nanoparticles that Affect Their Removal During Water Treatment

Increased Mobility of Metal Oxide Nanoparticles Due to Photo and Thermal Induced Disagglomeration

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