Dispersed systems

The theoretical knowledge required to understand, formulate and implement 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 line with the specifications and expected properties of use. Topics covered include powder dispersibility, modification of the solid/liquid interface to control zeta potential and colloidal interactions (extended DLVO), and the rheology of dispersed systems in relation to the state of dispersion. Liquid-liquid dispersion: emulsification, Winsor's R ratio, HLD formulation and formulation maps.

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

CM: 11

TD : 9

• Extract relevant quantities from a particle size analysis to characterize a divided solid, depending on the technique used (microscopy, light scattering, sedigraphy, etc.).
• Identify the role of adjuvants (dispersing polymers, surfactants, viscosity-correcting polymers, gelling agents, etc.) used in the various stages of formulating a solid/liquid dispersion.
• Identify the various factors involved in destabilizing dispersions and analyze the rheological behavior of a dispersion in relation to its microscopic state (stable, aggregated, etc.). Use a rational approach to modify a formulation in order to limit sedimentation/aggregation phenomena. Differentiate between viscosifying and gelling polymers.
• Formulation of emulsions using the HLD method.
• Various applications will be studied through examples chosen to illustrate the concepts presented, in particular the development of dispersed precursor systems for ceramic or composite materials, emulsion synthesis of latex and quantum dots nanoparticles and metal nanoparticles, microcapsule development techniques...

Basic 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 cover solid/liquid and liquid/liquid dispersions:

• Introduction to the notion of equivalent sphere and granulometry of divided solids (2H)
• Dispersibility of divided solids, role of adjuvants in dispersion formulation, identification of aggregation/flocculation phenomena. Characterization of dispersion state 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 TD (9H):  

• Formulation of solid-liquid dispersions, with particular focus on precursors for ceramic and composite functional materials (3H)
• Emulsion formulation, 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/