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Lecture notes of the 15th international summer school on Fundamental Problems in Statistical Physics: Colloidal dispersions

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  • Gnan, Nicoletta

Abstract

In this brief contribution we review some basic concepts in the physics of soft matter focusing on colloidal dispersions. In the first part we discuss the phase behavior of hard colloidal particles and, building on a statistical mechanics formalism, we introduce the concept of effective interactions between colloids mediated by the presence of macromolecular additives in the dispersion. We then review some examples of effective interactions starting from the simplest entropy-driven mechanism observed in nature, i.e. the depletion effect, but also discussing more complex interactions as those mediated by a critical co-solute. In the second part, we introduce a novel type of colloids having particles “softness” as an extra control parameter. We focus on a particular type of soft colloid, called microgel, that has a polymeric nature since it is made of a cross-linked polymer network able to respond to external stimuli. Finally, to understand microgels responsiveness we discuss the thermodynamics of swelling of polymer networks described by the Flory-Rehner theory.

Suggested Citation

  • Gnan, Nicoletta, 2023. "Lecture notes of the 15th international summer school on Fundamental Problems in Statistical Physics: Colloidal dispersions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 631(C).
    • Handle: RePEc:eee:phsmap:v:631:y:2023:i:c:s0378437122009700
    DOI: 10.1016/j.physa.2022.128412
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    References listed on IDEAS

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