Controlling the volume fraction of glass-forming colloidal suspensions using thermosensitive host “mesogels” - Archive ouverte HAL Access content directly
Journal Articles Journal of Chemical Physics Year : 2022

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

(1) , (1) , (1) , (1) , (1)
1
Juliette Behra
Domenico Truzzolillo
Laurence Ramos
Luca Cipelletti
  • Function : Author
  • PersonId : 977491

Abstract

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, like the popular poly(Nisopropylacrylamide) (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 − 200 µm 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.
Fichier principal
Vignette du fichier
2203.04407.pdf (2.49 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03648878 , version 1 (22-04-2022)

Identifiers

Cite

Juliette Behra, Ambre Thiriez, Domenico Truzzolillo, Laurence Ramos, Luca Cipelletti. Controlling the volume fraction of glass-forming colloidal suspensions using thermosensitive host “mesogels”. Journal of Chemical Physics, 2022, 156 (13), pp.134901. ⟨10.1063/5.0086822⟩. ⟨hal-03648878⟩
12 View
37 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More