Gelation and Re-entrance in Mixtures of Soft Colloids and Linear Polymers of Equal Size.
Journal
Macromolecules
ISSN: 0024-9297
Titre abrégé: Macromolecules
Pays: United States
ID NLM: 0365316
Informations de publication
Date de publication:
14 Mar 2023
14 Mar 2023
Historique:
received:
10
12
2022
revised:
02
02
2023
entrez:
20
3
2023
pubmed:
21
3
2023
medline:
21
3
2023
Statut:
epublish
Résumé
Liquid mixtures composed of colloidal particles and much smaller non-adsorbing linear homopolymers can undergo a gelation transition due to polymer-mediated depletion forces. We now show that the addition of linear polymers to suspensions of soft colloids having the same hydrodynamic size yields a liquid-to-gel-to-re-entrant liquid transition. In particular, the dynamic state diagram of 1,4-polybutadiene star-linear polymer mixtures was determined with the help of linear viscoelastic and small-angle X-ray scattering experiments. While keeping the star polymers below their nominal overlap concentration, a gel was formed upon increasing the linear polymer content. Further addition of linear chains yielded a re-entrant liquid. This unexpected behavior was rationalized by the interplay of three possible phenomena: (i) depletion interactions, driven by the size disparity between the stars and the polymer length scale which is the mesh size of its entanglement network; (ii) colloidal deswelling due to the increased osmotic pressure exerted onto the stars; and (iii) a concomitant progressive suppression of the depletion efficiency on increasing the polymer concentration due to reduced mesh size, hence a smaller range of attraction. Our results unveil an exciting new way to tailor the flow of soft colloids and highlight a largely unexplored path to engineer soft colloidal mixtures.
Identifiants
pubmed: 36938509
doi: 10.1021/acs.macromol.2c02491
pmc: PMC10019458
doi:
Types de publication
Journal Article
Langues
eng
Pagination
1818-1827Informations de copyright
© 2023 The Authors. Published by American Chemical Society.
Déclaration de conflit d'intérêts
The authors declare no competing financial interest.
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