The use of dielectric spectroscopy in the investigation of the effect of polymer choice on the flocculation of polystyrene particles

Christensen, Peter Vittrup; Hinge, Mogens; Keiding, Kristian

doi:10.1016/j.jcis.2008.11.027

Cited by 8 publications

(5 citation statements)

References 39 publications

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“…This indicates that the aggregation of the particles increases the magnitude of the dispersion. Such an increase in the dispersion magnitude has previously been observed during flocculation of polystyrene particles with different polymer types [6,11]. As argued previously the flocculation of the 11% AA particles with the HMW polymer is believed to take place partly due to a formation of small interparticle bridges.…”

Section: Changes In Dispersion Magnitude During Flocculationsupporting

confidence: 74%

“…This destabilisation causes an increase in s due to the increased diffusion length of polarisation in the aggregates. No specific relationship between s and aggregate size is available, but previous studies have indicated that it depends not only on size but also on the structure of the formed aggregates [11]. In a previous study where the flocculation of polystyrene particle with polyDADMAC polymer was investigated using dielectric spectroscopy, it was found that the modeled values of s decreased prior to the onset of deflocculation [6].…”

Section: Changes In Relaxation Time During Flocculationmentioning

confidence: 99%

“…The magnitude of the dielectric dispersion is dependent on both particle volume fraction and charge. In recent studies, the use of dielectric spectroscopy for characterising the flocculation of hard polystyrene particles at different particle concentrations [6] and using different polymeric flocculatants [11] was reported. It was found that the formation of particle aggregates resulted in an increase in the time constant of the dielectric relaxation process.…”

Section: Introductionmentioning

confidence: 99%

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The use of dielectric spectroscopy for the characterisation of polymer-induced flocculation of core–shell particles

Christensen¹,

Christensen²,

Keiding³

2011

Journal of Colloid and Interface Science

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Flocculation is an important process in separation science, but only few methods are available for on-line evaluation of the process. Recently, it has been shown that dielectric spectroscopy can be used to characterise the flocculation process of hard polystyrene particles. As many "real life" suspensions contain particles covered with a porous layer of organic material, it is of interest to investigate the potential of dielectric spectroscopy to characterise the flocculation of such suspensions as well. In this paper dielectric spectroscopy is used to investigate the flocculation process of core-shell particles. The flocculation process is characterised using a photometric dispersion analyser as a reference method, and the results are compared to the dielectric dispersions measured by dielectric spectroscopy. It is found that the use of the relaxation time of the dielectric dispersion for an evaluation of the flocculation process is commensurate with the use of the photometric dispersion analyser. Furthermore, the magnitude of the dielectric dispersion is observed to decrease as the charge of the core-shell particles is neutralised. Dielectric spectroscopy is thus found to have potential as an on-line flocculation monitor.

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Section: Changes In Dispersion Magnitude During Flocculationsupporting

confidence: 74%

Section: Changes In Relaxation Time During Flocculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The use of dielectric spectroscopy for the characterisation of polymer-induced flocculation of core–shell particles

Christensen¹,

Christensen²,

Keiding³

2011

Journal of Colloid and Interface Science

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“…Stronger attraction results in a higher collision efficiency and then in a more open and developed agglomerate structure. [50] Using these interpretations, it is then possible to draw a more comprehensive and detailed description of the morphology of the composite electrodes under study. One has to remember that the casting process used here to prepare the composite electrodes involves two steps: i) mixing, which is done with a shear stress applied, and, ii) casting followed by drying, during which no shear stress is applied.…”

Section: Fine Description Of the Morphology Of The Electrode Through mentioning

confidence: 99%

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

Badot

Ligneel

Dubrunfaut

et al. 2009

Adv Funct Materials

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International audienceThe broadband dielectric spectroscopy technique is applied, for the first time, to a composite material used as an electrode for lithium battery. The electrical properties (permittivity and conductivity) are measured from low (a few Hz) to microwave (a few GHz) frequencies. The results demonstrate that the broadband dielectric spectroscopy technique is very sensitive to the different scales of the electrode architecture involved in electronic transport, from interatomic distances to macroscopic sizes, as well as to the morphology at these scales, coarse or fine distribution of the constituents. This work opens up new prospects for a more fundamental understanding and more rational optimization of the electronic transport in composite electrodes for lithium batteries and other electrochemical energy storage technologies (including other batteries, supercapacitors, low- and medium-temperature fuel cells), electrochemical sensors and conductor-insulator composite materials

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“…Recently, the use of DS to monitor the flocculation of polystyrene particles [15,16] was investigated. It was found that the characteristics of the measured dielectric dispersion could be related to the flocculation process.…”

Section: Introductionmentioning

confidence: 99%

The use of dielectric spectroscopy for the characterisation of the precipitation of hydrophobically modified poly(acrylic-acid) with divalent barium ions

Christensen

Keiding

2009

Journal of Colloid and Interface Science

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The use of dielectric spectroscopy in the investigation of the effect of polymer choice on the flocculation of polystyrene particles

Cited by 8 publications

References 39 publications

The use of dielectric spectroscopy for the characterisation of polymer-induced flocculation of core–shell particles

The use of dielectric spectroscopy for the characterisation of polymer-induced flocculation of core–shell particles

A Multiscale Description of the Electronic Transport within the Hierarchical Architecture of a Composite Electrode for Lithium Batteries

The use of dielectric spectroscopy for the characterisation of the precipitation of hydrophobically modified poly(acrylic-acid) with divalent barium ions

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