Journal ArticleDOI
Effects of surface conduction on the electrokinetic properties of colloids
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In this paper, the effects of surface conduction behind the slip plane on the electrokinetic transport properties of colloids were quantified and the thin-double-layer theory of Fixman was extended for dilute sols of spherical particles.Abstract:
To quantify the effects of surface conduction behind the slip plane on the electrokinetic transport properties of colloids, we have extended the thin-double-layer theory of Fixman for dilute sols of spherical particles. The computations show that it causes the static conductivity and the low-frequency dielectric response of the sol to increase and the mobility of the particles to decrease. Hence, the occurrence of surface conduction significantly changes the relationships between the different electrokinetic properties. Therefore, for a rigorous interpretation of experimental results taking possible effects of surface conduction adequately into account, it is imperative to collect data with more than one electrokinetic technique. For polystyrene latices, a comparison between theory and experiment has been made. The mobility and static conductivity data can be well reconciled if surface conduction is accounted for. The corresponding estimates of surface charge densities agree very well with values obtained by independent measurements. However, the extreme dielectric behaviour of latex colloids cannot be attributed to surface conduction.read more
Citations
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Journal ArticleDOI
Measurement and interpretation of electrokinetic phenomena
Ángel V. Delgado,Fernando González-Caballero,Robert J. Hunter,Luuk K. Koopal,Johannes Lyklema +4 more
TL;DR: The recommendations given in the report apply mainly to smooth and homogeneous solid particles and plugs in aqueous systems; some attention is paid to nonaqueous media and less ideal surfaces.
Book ChapterDOI
Fundamentals of Interface and Colloid Science
Andrei S. Dukhin,Philip J. Goetz +1 more
TL;DR: There are three groups of traditional particle sizing methods that can be applied to characterize the size of colloidal particles: counters, fractionation techniques, and macroscopic fitting techniques as discussed by the authors, which are combined terms and methods that have been created over the course of two centuries to characterize very special systems.
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Charging and Aggregation Properties of Carboxyl Latex Particles: Experiments versus DLVO Theory
Sven Holger Behrens,Daniel Iso Christl,Rudi Emmerzael,and Peter Schurtenberger,Michal Borkovec +4 more
TL;DR: In this article, the early stages of aggregation in dilute colloidal suspensions were studied and the charging behavior as a function of solution pH was characterized in acid−base titration and electrophoresis experiments at fixed ionic strength.
Journal ArticleDOI
Extended Electrokinetic Characterization of Flat Solid Surfaces
TL;DR: An experimental setup has been developed and applied for the combined determination of the electrokinetic potential and the surface conductivity of flat surfaces and the results obtained were found to agree well if correct conductivity values for the calculation of the zeta potential based on the streaming potential data are used.
Journal ArticleDOI
Dielectrophoresis for manipulation of micro/nano particles in microfluidic systems
TL;DR: The theory of dielectrophoresis, different configurations, and the applications of such systems for particle manipulation and device fabrication in microfluidic systems are presented.
References
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Journal ArticleDOI
Electrophoretic mobility of a spherical colloidal particle
R.W O'Brien,Lee R. White +1 more
TL;DR: In this article, it was shown that for a colloidal particle of any shape the mobility is independent of the dielectric properties of the particle and the electrostatic boundary conditions on the particle surface.
Journal ArticleDOI
Calculation of the electrophoretic mobility of a spherical colloid particle
TL;DR: In this article, a new calculation of the relation between the electrophoretic mobility and the ζ-potential of a spherical colloid particle is presented, which consists of a rigid, electrically insulating sphere surrounded by a Gouy-Chapman double layer.
Calculation of the Electrophoretic Mobility of a Spherical
TL;DR: In this paper, a new calculation of the relation between the electrophoretic mobility and the/potential of a spherical colloid particle is presented, which consists of a rigid, electrically insulating sphere surrounded by a Gouy-Chapman double layer.
Journal ArticleDOI
Adsorption of potential-determining ions at the silica-aqueous electrolyte interface and the role of some cations
Th.F. Tadros,Johannes Lyklema +1 more
TL;DR: In this paper, the specific surface charge density on a silica sample of known surface area was measured in the presence of LiCl, NaCl, KCl, CsCl and (C2H5)4NCl.
Journal ArticleDOI
Dielectric response and conductivity of dilute suspensions of colloidal particles
Emma H. B. DeLacey,Lee R. White +1 more
TL;DR: In this article, a numerical scheme for solving the equations which govern the behaviour of dilute suspensions of colloidal particles in an oscillating electric field is developed for the conductivity and the complex dielectric response of a dilute suspension.
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