Controlling the volume fraction of glass-forming colloidal suspensions using thermosensitive host “mesogels”

The key parameter controlling the glass transition of colloidal suspensions is φ, the fraction of the sample volume occupied by the particles. Unfortunately, changing φ by varying an external parameter, e.g., temperature T as in molecular glass formers, is not possible, unless one uses thermosensiti...

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Veröffentlicht in:The Journal of chemical physics 2022-04, Vol.156 (13), p.134901-134901
Hauptverfasser: Behra, J. S., Thiriez, A., Truzzolillo, D., Ramos, L., Cipelletti, L.
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container_end_page 134901
container_issue 13
container_start_page 134901
container_title The Journal of chemical physics
container_volume 156
creator Behra, J. S.
Thiriez, A.
Truzzolillo, D.
Ramos, L.
Cipelletti, L.
description The key parameter controlling the glass transition of colloidal suspensions is φ, the fraction of the sample volume occupied by the particles. Unfortunately, changing φ by varying an external parameter, e.g., temperature T as in molecular glass formers, is not possible, unless one uses thermosensitive colloidal particles, such as the popular poly(N-isopropylacrylamide) (PNiPAM) microgels. These, however, have several drawbacks, including high deformability, osmotic deswelling, and interpenetration, which complicate their use as a model system to study the colloidal glass transition. Here, we propose a new system consisting of a colloidal suspension of non-deformable spherical silica nanoparticles, in which PNiPAM hydrogel spheres of ∼100−200μm size are suspended. These non-colloidal “mesogels” allow for controlling the sample volume effectively available to the silica nanoparticles and hence their φ, thanks to the T-induced change in mesogels’ volume. Using optical microscopy, we first show that the mesogels retain their ability to change size with T when suspended in Ludox suspensions, similarly as in water. We then show that their size is independent of the sample thermal history such that a well-defined, reversible relationship between T and φ may be established. Finally, we use space-resolved dynamic light scattering to demonstrate that, upon varying T, our system exhibits a broad range of dynamical behaviors across the glass transition and beyond, comparable with those exhibited by a series of distinct silica nanoparticle suspensions of various φ.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Colloids
Condensed Matter
Deformation
Formability
Glass
Glass transition
Hydrogels
Ludox (trademark)
Microgels
Nanoparticles
Optical microscopy
Parameters
Photon correlation spectroscopy
Physics
Polyisopropyl acrylamide
Silicon dioxide
Soft Condensed Matter
title Controlling the volume fraction of glass-forming colloidal suspensions using thermosensitive host “mesogels”
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