Coagulation of kaolinite colloids in high carbonate strength water

Aurell, Christina; Wistrom, Anders O.

doi:10.1016/s0927-7757(00)00488-x

Cited by 18 publications

(6 citation statements)

References 26 publications

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“…Such aggregates are usually not studied in natural environments because of disaggregation caused by the tension applied during sampling and/or centrifugation of water to concentrate PM. Whereas aggregation processes, investigated in laboratory experiments, had been recently shown to be an important mechanism of PM and colloid-facilitated transport in soils [25][26][27][28].…”

Section: Discussionmentioning

confidence: 99%

New technique for in situ sampling of particulate matter and colloids in soil and atmospheric fallout

Perdrial¹,

Elsass²,

Liewig³

2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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This note describes a new technique for in situ sampling of fine particulate matter (PM) including colloids in natural environments. The technique is based on a microlysimeter which is easy to move between field and laboratory and can be routinely used for in situ monitoring. The design of the device aims at limiting bias and artefacts encountered with current sampling methods based on successive field collection of liquid samples, transport, storage and filtration in the laboratory. Samples are directly collected on transmission electron microscopy (TEM) grids, thus totally eliminating the modifications classically due to handling of samples from collection to analysis. Detailed physical and chemical microscopic studies of individual particles can then be performed in order to fully characterize PM in natural media such as soil solutions, atmospheric fallout, rainfall and any aquatic system. This technique can be applied in a number of research fields, such as the characterization and determination of pollution vectors, the tracing of sources of emissions, or investigations on particle interactions.

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Section: Discussionmentioning

confidence: 99%

New technique for in situ sampling of particulate matter and colloids in soil and atmospheric fallout

Perdrial¹,

Elsass²,

Liewig³

2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The data collected from experiments of the aggregation kinetics were simulated by the DLVO model. The classical DLVO model is appropriate for the simulation of aggregation behaviour of colloids and ENPs in aquatic environments (Aurell & Wistrom, ; Petosa et al , ). The function of the van der Waals attraction and the electrostatic double layer interaction, which are dominant for the interaction of nanoparticles, determines the attachment efficiency (α) in the DLVO model and is applied to simulate the experimental data (Puertas & de las Nieves, ):

α = \frac{true \int_{0}^{\infty} β (h) \frac{\exp [V_{A} (h) / K_{B} T]}{{(2 a + h)}^{2}} d h}{true \int_{0}^{\infty} β (h) \frac{\exp [V_{T} (h) / K_{B} T]}{{(2 a + h)}^{2}} d h},

…”

Section: Methodsmentioning

confidence: 99%

Aggregation kinetics of natural soil nanoparticles in different electrolytes

Zhu

Chen

et al. 2014

European J Soil Science

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Summary In the space of just a few years, nanotechnology has become a topical subject not only in academia, but also in the daily lives of people. In order to investigate the properties of natural nanoparticles (NNPs) and to obtain a better understanding of their environmental behaviour and impacts from a new perspective, transmission electron microscope (TEM), zeta potential analysis and time‐resolved dynamic light scattering (DLS) analysis were used to examine the main properties and aggregation kinetics of NNPs extracted from Chinese soils added to various concentrations of the electrolytes NaCl, CaCl2 and LaCl3. The NNPs that were less than 100 nm remained stable for 100 days. The classic Derjaguin‐Landau‐Verwey‐Overbeek (DLVO) model partially revealed the aggregation behaviour of NNPs, in which ionic strength, composition and size may play important roles. The influence of hematite and natural organic matter (NOM) was demonstrated by aggregation kinetics and critical coagulation concentrations (CCC). The size of NNPs could also change the maximum total potential energy of interactions in the systems (VT(h)). These factors make the aggregation of NNPs in electrolytes different from that of soil colloids and influence the environmental behaviour of NNPs.

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“…Clay particle aggregation is complicated as they have different modes of aggregation (plane -to -plane, plane -to -edge and edge -toedge) (Lagaly and Ziesmer, 2003 ). The stability of clays in natural water is mainly determined by charge and charge heterogeneity (Aurell and Wistrom, 2000 ;Chang and Sposito, 1996 ). As with all standard or reference materials, the application of results obtained on isolated clays in laboratory studies to their behaviour in natural environments should be performed cautiously for several reasons, given the heterogeneity, complexity and spatial and temporal variability of natural samples.…”

Section: Aluminium Phyllosilicatesmentioning

confidence: 99%