Dispersed systems

The theoretical knowledge necessary for the understanding, formulation and implementation of dispersed systems will be detailed in this module. The physico-chemical principles governing the preparation and stability of solid-liquid and liquid-liquid dispersions will be detailed in accordance with the specifications and the expected properties of use. The different concepts addressed are dispersibility of powders, modification of the solid/liquid interface for the control of zeta potential and colloidal interactions (extended DLVO), rheology of dispersed systems in relation with the state of dispersion. Liquid-liquid dispersion: emulsification, Winsor's R ratio, HLD formulation and formulation maps.

Introduction to synthesis techniques in dispersed media: emulsion synthesis of nanoparticles, latex, microcapsules...

CM : 11

TD : 9

• Extract from a particle size analysis relevant quantities to characterize a divided solid according to the technique used (microscopy, light scattering, sedigraphy...).
• Identify the role of adjuvants (dispersing polymers, surfactants, viscosity correcting polymers, gelling agents, etc.) used in the different stages of the formulation of a solid/liquid dispersion.
• Identify the different destabilization factors of dispersions and analyze the rheological behavior of a dispersion in relation with its microscopic state (stable, aggregated...). Implement a rational approach to modify a formulation in order to limit sedimentation/aggregation phenomena. Differentiate between viscous and gelling polymers.
• Formulation of emulsions by the HLD method.
• Different applications will be studied through examples chosen to illustrate the concepts presented, in particular, the development of dispersed systems precursors of ceramic or composite materials, emulsion synthesis of latex and quantum dots nanoparticles and metallic nanoparticles, techniques for the development of microcapsules ...

Concepts of physical chemistry of colloids

Mastery of the principles of physical chemistry of aqueous solutions

Notions of macromolecular chemistry

Notions of solution synthesis

100% continuous assessment

This course will deal with solid/liquid and liquid/liquid dispersions:

• Presentation of the notion of equivalent sphere and granulometry of divided solids (2H)
• Dispersibility of divided solids, role of additives in the formulation of a dispersion, identification of aggregation/flocculation phenomena. Characterization of the state of dispersion by rheology (5H)
• Elaboration of emulsions by the HLD method, presentation of formulation maps (4H)

Examples of applications of dispersed systems will be presented in a TD (9H):  

• Formulation of solid-liquid dispersions, with particular attention to precursors of functional materials of ceramic and composite type (3H)
• Formulation of emulsions, example of formulation cards ((3H))
• Synthesis in emulsions and micellar media (metallic nanoparticles, quantum dots, latex, microcapsules...) (3H)

Administrative contact(s):

Secretariat Master Chemistry

https://master-chimie.edu.umontpellier.fr/