Lecture

Surface Potential Measurement: Zeta Potential

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In course

MSE-326: Ceramic and colloidal processing

The course covers the production of ceramics and colloids from the basic scientific concepts and theories needed to understand the forming processes to the mechanisms and methods of sintering (firing) ceramics. Including the scientific principles behind th ...

Description

This lecture covers the measurement of surface potential, focusing on zeta potential and its calculation from electrophoretic mobility or acoustophoresis. It explains the concept of the slip plane, isoelectric point, and point of zero charge. The Gouy-Chapman-Stern model and the factors affecting the double layer are discussed. The lecture also delves into the DLVO theory, interaction forces in colloidal systems, and the aggregation kinetics of colloidal suspensions. The presentation concludes with the evaluation of colloidal stability, critical coagulation concentration, and the Hamaker model for assessing stability against agglomeration.

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Instructors (2)

Paul Bowen

Dr. P. Bowen after gaining his BSc in Physics at Imperial College (UK), he obtained his Ph.D. in Physical Chemistry in the field of catalysis from the University of Cambridge, UK, in 1982, He then worked at the BP Research Centre, Sunbury, UK, for 4 years in applied surface sciences before moving to Switzerland and EPFL in 1987. He has been at the Powder Technology Laboratory, in the Materials Institute since its conception in 1988. He has over 190 publications and has written an undergraduate book on ceramic synthesis and processing. Education: 1976-1979 Imperial College of Science and Technology, University of London. B.Sc. Honours in Physics. 1979-1982 Department of Physical Chemistry, University of Cambridge. Certificate of Postgraduate Studies in Chemistry. Thesis: A Mössbauer Study of Some Clay Minerals and their Surfaces. Ph.D. in Physical Chemistry. Thesis: An Iron-57 and Tin-119 Mössbauer Spectroscopic Study of Some Graphite Intercalation Compounds and Carbon Supported Iron Catalysts. Professional Experience: 1983-1986 Research Scientist (Physical Chemist), New Technology Division, British Petroleum Company plc, BP Research Centre, Sunbury on Thames, Middlesex TW16 7LN, England. 1987-1988 Engineer, Ceramics Laboratory, Département des Matériaux, Ecole Polytechnique Fédérale de Lausanne, CH - 1015 Lausanne, Switzerland. 1988-2008 Research Associate/lecturer, Powder Technology Laboratory (Present) Institute des Matériaux, Ecole Polytechnique Fédérale de Lausanne, CH - 1015 Lausanne, Switzerland. 1988- 2015 Maitre DEnsiegnement et Recherche (Lecturer & Researcher), Powder Technology Laboratory, Institute des Matériaux, Ecole Polytechnique Fédérale de Lausanne,CH - 1015 Lausanne, Switzerland 2015 – present Adjunct Professor (Professeur Titulaire), Powder Technology Laboratory (LTP), Materials Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH - 1015 Lausanne, Switzerland

Andrea Testino

Expertise Ceramics synthesis and Processing; Nanomaterial synthesis; Nanomaterial characterization; Thermodynamic - Kinetic modeling; Powder synthesis scale-up. MER Dr. Andrea Testino received his master’s degree in Industrial Chemistry and PhD in Material Science from the University of Genoa (Italy). He did post-doctoral studies at EPFL (CH), University College London (UK), and University of Milan (I) working on nanoparticles synthesis and characterization. In 2007 he joined the company TDK-EPC (A) as Seni

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Physical chemistry: Electrochemistry

Related concepts (32)

Particle aggregation

Particle agglomeration refers to the formation of assemblages in a suspension and represents a mechanism leading to the functional destabilization of colloidal systems. During this process, particles dispersed in the liquid phase stick to each other, and spontaneously form irregular particle assemblages, flocs, or agglomerates. This phenomenon is also referred to as coagulation or flocculation and such a suspension is also called unstable. Particle agglomeration can be induced by adding salts or other chemicals referred to as coagulant or flocculant.

Electrophoresis

Electrophoresis is the motion of dispersed particles relative to a fluid under the influence of a spatially uniform electric field. Electrophoresis of positively charged particles (cations) is sometimes called cataphoresis, while electrophoresis of negatively charged particles (anions) is sometimes called anaphoresis. The electrokinetic phenomenon of electrophoresis was observed for the first time in 1807 by Russian professors Peter Ivanovich Strakhov and Ferdinand Frederic Reuss at Moscow University, who noticed that the application of a constant electric field caused clay particles dispersed in water to migrate.

Surface science

Surface science is the study of physical and chemical phenomena that occur at the interface of two phases, including solid–liquid interfaces, solid–gas interfaces, solid–vacuum interfaces, and liquid–gas interfaces. It includes the fields of surface chemistry and surface physics. Some related practical applications are classed as surface engineering. The science encompasses concepts such as heterogeneous catalysis, semiconductor device fabrication, fuel cells, self-assembled monolayers, and adhesives.

Interface and colloid science

Interface and colloid science is an interdisciplinary intersection of branches of chemistry, physics, nanoscience and other fields dealing with colloids, heterogeneous systems consisting of a mechanical mixture of particles between 1 nm and 1000 nm dispersed in a continuous medium. A colloidal solution is a heterogeneous mixture in which the particle size of the substance is intermediate between a true solution and a suspension, i.e. between 1–1000 nm. Smoke from a fire is an example of a colloidal system in which tiny particles of solid float in air.

Suspension (chemistry)

In chemistry, a suspension is a heterogeneous mixture of a fluid that contains solid particles sufficiently large for sedimentation. The particles may be visible to the naked eye, usually must be larger than one micrometer, and will eventually settle, although the mixture is only classified as a suspension when and while the particles have not settled out. A suspension is a heterogeneous mixture in which the solid particles do not dissolve, but get suspended throughout the bulk of the solvent, left floating around freely in the medium.

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Explores the DLVO theory and membrane potential to understand colloid stability and forces between charged surfaces.

Interfacial Chemistry: Surface Tension, Adsorption, Electrokinetics

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