Stability of Dispersions

Bellmann, Cornelia

doi:10.1002/ceat.200406135

Cited by 9 publications

(6 citation statements)

References 17 publications

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“…The further increasing of the pH value cannot propagate the degree of dissociation. The adsorption of OH − ions often observed on hydrophobic surfaces does not significantly contribute to the CB net surface charge. This result is also an indication that phenolic OH groups are not of importance.…”

Section: Resultsmentioning

confidence: 96%

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Endowing Carbon Black Pigment Particles with Primary Amino Groups

et al. 2009

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A readily synthetic route to endow the surface of hydrophobic carbon black (CB) particles with primary amino groups has been developed. The adsorption of the water-borne polyelectrolyte copolymer poly(vinyl amine-co-vinyl amide) (PVAm) on CB was studied as function of pH and polyelectrolyte concentration. The amino-functionalization process of CB with PVAm strongly depends on pH. As shown by electrokinetic measurement as function of pH, the content of accessible primary amino groups on the surface of CB increases with increasing the OH- concentration. The alternative functionalization of the CB surface with an anionic polyelectrolyte is demonstrated for the adsorption of poly(ethylene-alt-maleic anhydride) (PEMSA). About 50 mg of PVAm can be adsorbed on 1.0 g of CB, which is sufficient to completely alter the surface net charge. The aim of the introduced functional amino groups is their ability to act as anchoring groups for subsequent surface reactions improving the CB's process ability, compatibility, and adhesion properties.

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Section: Resultsmentioning

confidence: 96%

“…A pronounced plateau phase of the negative ζ-potential values was not observed (Figure a). In the pH region, where the electrokinetic measurements were carried out, the space for the adsorption of OH − ions is not strongly limited, because the hydrate shell of an OH − ion is partly or fully removed during its adsorption …”

Section: Resultsmentioning

confidence: 99%

Endowing Carbon Black Pigment Particles with Primary Amino Groups

et al. 2009

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“…The zeta potential is related to the electrokinetic charge density and therefore an intrinsic property of a solid–water interface. Despite of its independence of the surface area (and therefore on the surface roughness), the effect of surface waviness on the evolution of the streaming potential remains yet unclear. Apparent evidence for an effect of roughness at a microscopic scale on the determination of the surface zeta potential is finally explained by other effects related to the design of the sample holder or the measuring conditions …”

Section: Introductionmentioning

confidence: 99%

Influence of the structure of polymer fiber composites on the analysis of the zeta potential

Petrinić

Bukšek

Luxbacher

et al. 2018

J of Applied Polymer Sci

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This article addresses the questions about the influence of surface area, roughness, and sample mounting on the zeta potential analysis. A series of knitted yarns and fabrics of cotton and modacryl and their blends represent a real-life model system to study these effects. The combination of the natural cotton and the man-made modacryl makes possible to study the effect of the different origin for surface and interfacial charge and the surface area-weighted contributions to the average zeta potential of a chemically heterogeneous composite material. In our study, two measuring cells of the SurPASS electrokinetic analyzer were used, namely the Cylindrical Cell and the Adjustable Gap Cell. Comparison of the results obtained in two different measuring cells was related to the measured material. We used the Cylindrical Cell for both the zeta potential analysis of yarn and knitted fabrics and compared these results with data obtained for knitted fabrics using the Adjustable Gap Cell.

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“…The zeta-potential amount increases with increasing ion concentration till a maximum value where the particle surface is completely covered by the adsorbed anions. In [6] we could show that the specific adsorption of cations onto solid surfaces is controlled by the affinity of the surface to water. Highly solvated functional surface groups inhibit the adsorption of ions at the surface.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we show the usefulness of capillary penetration experiments and discuss some parameters that should be considered for the interpretation of the data. Ion adsorption processes, on the other hand, can be described by electrokinetic measurements [6,7].…”

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confidence: 99%

Controlling of Surface Parameters of Particles Used for Electrocodeposition

Bellmann

Caspari

Grundke

2009

KEM

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It is well known that colloid-chemical aspects, such as agglomeration processes, wetting and adsorption phenomena, have a decisive influence on the separation behaviour and coating quality of a composite plating. The following processing steps for electrocodeposition have to be considered: preparation of a stable dispersion of the particles in the electrolytic bath, transportation of the particles to the metal surface, adhesion of the particles onto the surface, incorporation of the particles in the metal matrix. Celis [1,2] and Hyashi [3] could show that ion adsorption onto the particle surface is very important for electrophoretic mobility and layer quality. On the other site, Fransaer and others [2,4] showed that surface free energy plays an important role for incorporation of particles in a metal matrix. They could demonstrate that hydrophilic particles do not make contact with the electrode, probably due to repulsive hydration forces. Hydrophobic particles make contact with the electrode, due to an attractive hydrophobic force. Hence it is important to have a method for estimating the hydrophilic/ hydrophobic surface properties of such particles to select a suitable surface modification strategy. A direct way to measure the surface free energy of solid particles is not available so far. Therefore, it is generally accepted to use the phenomenon of capillary penetration of liquids into porous media to determine the wetting properties of particles by measuring the penetration velocity of well-defined liquids in a powder packing. The kinetics of penetration correlates mainly to the geometric structure of the powder packing and the wettability of the particles. By using the equation-of-state approach for solid-liquid interfacial tensions the solid surface free energy of the particles can be determined [5]. In this paper, we show the usefulness of capillary penetration experiments and discuss some parameters that should be considered for the interpretation of the data. Ion adsorption processes, on the other hand, can be described by electrokinetic measurements [6,7].

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Stability of Dispersions

Cited by 9 publications

References 17 publications

Endowing Carbon Black Pigment Particles with Primary Amino Groups

Endowing Carbon Black Pigment Particles with Primary Amino Groups

Influence of the structure of polymer fiber composites on the analysis of the zeta potential

Controlling of Surface Parameters of Particles Used for Electrocodeposition

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