Lecture

Dispersion Forces: Interactions and Applications

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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 fundamental concepts of dispersion forces, including Van der Waals forces, electrostatic interactions, and steric repulsion. It explains the total interaction energy between particles, the influence of dispersion interactions on material properties, and the interaction between instantaneous and induced dipoles. The lecture also discusses the dispersion interaction between particles, semi-infinite plates, and curved surfaces, as well as the measurement of interparticle forces using AFM. Additionally, it explores the attractive magnetic forces in ceramics and the role of superparamagnetism in biomedical applications.

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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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Related concepts (28)

Van der Waals force

In molecular physics, the van der Waals force is a distance-dependent interaction between atoms or molecules. Unlike ionic or covalent bonds, these attractions do not result from a chemical electronic bond; they are comparatively weak and therefore more susceptible to disturbance. The van der Waals force quickly vanishes at longer distances between interacting molecules. Named after Dutch physicist Johannes Diderik van der Waals, the van der Waals force plays a fundamental role in fields as diverse as supramolecular chemistry, structural biology, polymer science, nanotechnology, surface science, and condensed matter physics.

Colloid

A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance. Some definitions specify that the particles must be dispersed in a liquid, while others extend the definition to include substances like aerosols and gels. The term colloidal suspension refers unambiguously to the overall mixture (although a narrower sense of the word suspension is distinguished from colloids by larger particle size).

Intermolecular force

An intermolecular force (IMF) (or secondary force) is the force that mediates interaction between molecules, including the electromagnetic forces of attraction or repulsion which act between atoms and other types of neighbouring particles, e.g. atoms or ions. Intermolecular forces are weak relative to intramolecular forces – the forces which hold a molecule together. For example, the covalent bond, involving sharing electron pairs between atoms, is much stronger than the forces present between neighboring molecules.

Dispersion (chemistry)

A dispersion is a system in which distributed particles of one material are dispersed in a continuous phase of another material. The two phases may be in the same or different states of matter. Dispersions are classified in a number of different ways, including how large the particles are in relation to the particles of the continuous phase, whether or not precipitation occurs, and the presence of Brownian motion. In general, dispersions of particles sufficiently large for sedimentation are called suspensions, while those of smaller particles are called colloids and solutions.

Superparamagnetism

Superparamagnetism is a form of magnetism which appears in small ferromagnetic or ferrimagnetic nanoparticles. In sufficiently small nanoparticles, magnetization can randomly flip direction under the influence of temperature. The typical time between two flips is called the Néel relaxation time. In the absence of an external magnetic field, when the time used to measure the magnetization of the nanoparticles is much longer than the Néel relaxation time, their magnetization appears to be in average zero; they are said to be in the superparamagnetic state.

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