Estimations of the aggregation time of various colloidal systems

Bremer, L.G.B.; Walstra, P.; Vliet, T. van

doi:10.1016/0927-7757(95)03159-b

Cited by 53 publications

(38 citation statements)

References 17 publications

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“…Many methods of determining the gel time have been proposed [10,29,30]. In this study and in accordance with the previous report [8], gel times are determined by monitoring C(τ ).…”

Section: Gel Timesmentioning

confidence: 80%

“…(1), W ∞ is expected to have a value of 0-2 [9,10], indicating a negligible role in this study. A sample of the experimental data is shown in Fig.…”

Section: Dilute Aggregationmentioning

confidence: 97%

“…The following equation describes the gelation of particles interacting in this manner relating the gel time t gel to the stability ratio and particle volume fraction φ through the use of the fractal dimension D f , which describes the openness of the aggregates [10]:…”

Section: Introductionmentioning

confidence: 99%

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Role of solvation forces in the gelation of fumed silica–alcohol suspensions

Smith

Zukoski

2006

Journal of Colloid and Interface Science

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“…Many methods of determining the gel time have been proposed [10,29,30]. In this study and in accordance with the previous report [8], gel times are determined by monitoring C(τ ).…”

Section: Gel Timesmentioning

confidence: 80%

“…(1), W ∞ is expected to have a value of 0-2 [9,10], indicating a negligible role in this study. A sample of the experimental data is shown in Fig.…”

Section: Dilute Aggregationmentioning

confidence: 97%

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Role of solvation forces in the gelation of fumed silica–alcohol suspensions

Smith

Zukoski

2006

Journal of Colloid and Interface Science

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“…The same power law dependency between the demarcation line of regions I and II with that observed for regions II and III, indicates that both of them are controlled by the same mechanism, which in this particular case is due to Brownian motion acting alone. By detailed analysis of the gelation time for the case of pure Brownian mechanism (as shown by Bremer et al 52 and Sefcik et al 53 ), it was found that this depends on both primary particle size as well as solid volume fraction in the inlet stream according to (26) When assuming that characteristic time for gelation would be constant according to this equation, data plotted in Figures 7a-c should scale with a power equal to 32d f ð Þ 21 . In fact, as can be seen all data below approximately 80 nm follow closely this scaling, which supports the assumption about comparable gelation time.…”

Section: Aggregation In Turbulent Jetmentioning

confidence: 97%

Assessment of gel formation in colloidal dispersions during mixing in turbulent jets

Šoóš

Marchisio²,

Šefčı́k

2013

AIChE Journal

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Onset of gel formation upon mixing between colloidal dispersions and coagulant solutions in turbulent jets was studied using a combination of computational fluid dynamics (CFD) and population balance equation (PBE). To describe the interaction between turbulence fluctuations and particle aggregation, a micromixing model based on presumed probability density function was implemented inside the CFD code. Furthermore, effect of the solid phase on the fluid flow was modeled through an effective viscosity of the mixture evaluated from PBE. The results are presented in the parameter space of the primary particle diameter and the solid volume fraction where strong interplay between mixing and aggregation mechanisms controls the gelation phenomena and consequently also the fluid dynamics. Simulation results are in good agreement with observations from gelation experiments of concentrated nanoparticle suspensions injected into coagulant solutions

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“…These expressions are well suited to extract a coagulation halftime that can be used as a qualitative description of the coagulation process [16,17]. However they cannot properly describe the cluster size evolution through the entire coagulation process.…”

Section: Laminar Coagulationmentioning

confidence: 99%

Aggregation and breakup of acrylic latex particles inside millimetric scale reactors

Lachin

Sauze

Raimondi

et al. 2017

Chemical Engineering and Processing: Process Intensification

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OATAO is an open access repository that collects the work of some Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tAggregation of acrylic latex is investigated inside tubular millireactors working under laminar hydrodynamic conditions. The size distribution and fractal dimension of aggregates are measured using light scattering. Results show that the equilibrium between rupture and aggregation is achieved quickly, allowing the study of cluster size distribution and shape at the aggregation/rupture steady state. Both laminar hydrodynamic conditions and high shear rate are suspected to promote the formation of aggregates with a high fractal dimension, which means that the particles are almost spherical, thereby offering an interesting alternative to conventional batch processes. These results can provide useful information for industries aiming at producing aggregates at specified size and quality.

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Estimations of the aggregation time of various colloidal systems

Cited by 53 publications

References 17 publications

Role of solvation forces in the gelation of fumed silica–alcohol suspensions

Role of solvation forces in the gelation of fumed silica–alcohol suspensions

Assessment of gel formation in colloidal dispersions during mixing in turbulent jets

Aggregation and breakup of acrylic latex particles inside millimetric scale reactors

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