Gelation and Re-entrance in Mixtures of Soft Colloids and Linear Polymers of Equal Size
| Autor: | Daniele Parisi, Domenico Truzzolillo, Ali H. Slim, Phillippe Dieudonné-George, Suresh Narayanan, Jacinta C. Conrad, Vishnu D. Deepak, Mario Gauthier, Dimitris Vlassopoulos |
|---|---|
| Přispěvatelé: | Product Technology, University of Groningen [Groningen], Institute of Electronic Structure and Laser (FORTH-IESL), Foundation for Research and Technology - Hellas (FORTH), Laboratoire Charles Coulomb (L2C), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), University of Houston, Argonne National Laboratory [Lemont] (ANL), Department of Chemistry [Waterloo], University of Waterloo [Waterloo], European Project: H2020-MCSA-ITN-2014,Colldense |
| Rok vydání: | 2023 |
| Předmět: |
Inorganic Chemistry
[CHIM.POLY]Chemical Sciences/Polymers Polymers and Plastics Organic Chemistry Materials Chemistry Soft Condensed Matter (cond-mat.soft) FOS: Physical sciences Colloids Condensed Matter - Soft Condensed Matter Polymer Rheology Gels [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Macromolecules, 56(5), 1818-1827. AMER CHEMICAL SOC Macromolecules Macromolecules, 2023, 56 (5), pp.1818-1827. ⟨10.1021/acs.macromol.2c02491⟩ |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.2c02491 |
| Popis: | 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 this entanglement network; (ii) colloidal deswelling due to the increased osmotic pressure exerted onto the stars; and (iii) a concomitant progressive suppression of depletion efficiency on increasing 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. Comment: 27 pages, 5 figures |
| Databáze: | OpenAIRE |
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