Coagulation Kinetics

Sonntag, H.; Strenge, K.; Vincent, Brian

doi:10.1007/978-1-4757-0617-8_4

Cited by 21 publications

(23 citation statements)

References 138 publications

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“…Increasing the ion concentration of the aqueous phase reduced the thickness of the double layer and prevented interactions among particles. 43 Schaller and Humphrey 44 investigated the effect of the ionic strength on the viscosity of a polystyrene latex of a known particle size and found that the viscosity at low shear rates was enhanced at the lowest ionic strength assessed.…”

Section: Resultsmentioning

confidence: 99%

Effect of the particle size distribution on the low shear viscosity of high‐solid‐content latexes

Amaral

Es²,

Asúa

2004

J. Polym. Sci. A Polym. Chem.

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The production of high-solid-content, low-viscosity latexes is an active field in both industry and academia. The viscosity of polymer dispersions has a clear dependence on the particle size distribution (PSD). An example is the rule of thumb that a bimodal PSD enables the reduction of the viscosity with respect to monomodal systems. Despite important progress in theoretical work, not much has been done to quantitatively predict the low shear viscosity of aqueous polymer dispersions as a function of the complex PSD. In this work, the capability of a low-shear-viscosity equation to quantitatively account for the influence of both the PSD and the physicochemical characteristics of the dispersions is experimentally assessed. An analysis, consistent with theoretical concepts, of the data with semiempirical correlations is proposed. Next, with values of the parameters of the viscosity equation obtained experimentally, the effect of a latex with a 70% solid content on the low shear viscosity is examined.

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Section: Resultsmentioning

confidence: 99%

Effect of the particle size distribution on the low shear viscosity of high‐solid‐content latexes

Amaral

Es²,

Asúa

2004

J. Polym. Sci. A Polym. Chem.

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“…[58][59][60][61] Lower n values, such as 2, 2.5, 3.5, or 4, also have been registered. [58][59][60][61] They should be explained either in terms of coagulation in the ''distant minimum'', i.e., through the water layers, or by adsorption of counter ions and low surface charges, and also by taking into account the retardation of the molecular forces. 58,59 In our case, the average n value is in-between 4.0 and 4.8.…”

Section: Colloidal Stability and Coagulation By Inorganic Electrolytesmentioning

confidence: 99%

“…This theory allows estimating the electrostatic repulsion energy U el and the attractive energy U attr of dispersion interaction between two spheres with radii r. [58][59][60][61] The primary 3 nm particles are evidently too small to be described by the DLVO theory in its classical version. 78,79 Hence, only the secondary aggregates should be considered.…”

Section: The Application Of the Dlvo Theorymentioning

confidence: 99%

Colloidal properties and behaviors of 3 nm primary particles of detonation nanodiamonds in aqueous media

Mchedlov‐Petrossyan

Kamneva

Marynin

et al. 2015

Phys. Chem. Chem. Phys.

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This study was aimed to reveal the principal colloidal properties of the aqueous dispersion of extremely small primary single-crystalline diamond particles in water. Together with the non-diamond layer, the size of the colloidal species is 2.8 ± 0.6 nm as found via DLS of the initial 5.00 wt/vol% hydrosol. Anionic dyes are readily adsorbed on the colloidal species. This is in line with the positive zeta-potential. The critical coagulation concentrations of the 0.19 wt/vol% nanodiamond hydrosol were determined with a set of inorganic electrolytes and anionic surfactants. The data are in line with the Schulze-Hardy rule for "positive" sols. The fulfillment of the lyotropic (Hofmeister) series was also observed for single-charged anions. The abnormal influence of alkali gives evidence of the acidic nature of the positive charge of the nanodiamond species. Application of acid-base indicators allows estimating the value of the interfacial electrical potential of the nanodiamond particles. Upon dilution from 5.00% to 0.01%, the colloidal system under study exhibits unusual changes. The average size increases ca. ten-fold as determined by DLS. The TEM images support this observation. At the same time, the viscosity drops. This phenomenon was explained in terms of the so-called periodic colloidal structures (colloidal crystals) in concentrated solutions.

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“…This phenomenon may be explained in terms of the so-called periodic colloidal structures [21][22][23] formed in concentrated solutions of highly solvated and very large colloids. For such systems, where the particles interact through the surrounding water layers, some peculiarities have been noticed long ago, mostly for much larger particles of the dispersed phase [21][22][23]. The "secondary" or "distant" minimum, resulting from the cooperative interactions, may be deeper as compared with that calculated from the interaction of two particles only.…”

Section: Size Increase Of Dnd Species On the Dilution: In Search For mentioning

confidence: 99%

The Properties of 3 nm-Sized Detonation Diamond from the Point of View of Colloid Science

et al. 2015

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The colloidal properties of the hydrosol of a detonation nanodiamond have been considered and discussed. The 3nm-sized positively charged colloidal species produced by the NanoCarbon Research Institute, Japan, undergo a further aggregation on the dilution. They exhibit the emission at 625 nm with the excitation maximum at 491 nm, adsorb anionic dyes, and readily coagulate at the adding of electrolytes. The coagulation occurs in line with the Schulze-Hardy rule, the coagulation strength of the anions follows the Hofmeister series, whereas the abnormally high influence of the most hydrophilic anion, HO − , allows revealing the acidic character of the positive surface charge. The hypothesis of the so-called periodic colloidal structures has been put forward in order to explain the dependence of the particle size on the concentration of the hydrosol and the high viscosity of the initial 5.0 wt./vol. % detonation nanodiamond colloid.

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Coagulation Kinetics

Cited by 21 publications

References 138 publications

Effect of the particle size distribution on the low shear viscosity of high‐solid‐content latexes

Effect of the particle size distribution on the low shear viscosity of high‐solid‐content latexes

Colloidal properties and behaviors of 3 nm primary particles of detonation nanodiamonds in aqueous media

The Properties of 3 nm-Sized Detonation Diamond from the Point of View of Colloid Science

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