Structure and Dynamics of Soft Repulsive Colloidal Suspensions in the Vicinity of the Glass Transition

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Abstract

We use a combination of different scattering techniques and rheology to highlight the link between structure and dynamics of dense aqueous suspensions of soft repulsive colloids in the vicinity of a glass transition. Three different latex formulations with an increasing amount of the hydrophilic component resulting in either purely electrostatically or electrosterically stabilized suspensions are investigated. From the analysis of the static structure factor measured by small-angle X-ray scattering, we derive an effective volume fraction that includes contributions from interparticle interactions. We further investigate the dynamics of the suspensions using 3D cross-correlation dynamic light scattering (3DDLS) and rheology. We analyze the data using an effective hard sphere model and in particular compare the linear viscoelasticity and flow behavior to the predictions of mode coupling theory, which accounts for a purely kinetic glass transition determined by the equilibrium structure factor. We demonstrate that seemingly very different colloidal systems exhibit the same generic behavior when the effects from interparticle interactions are incorporated using an effective volume fraction description.

Detaljer

Författare
  • Jerome Crassous
  • Lucia Casal-Dujat
  • Martin Medebach
  • Marc Obiols-Rabasa
  • Romaric Vincent
  • Frank Reinhold
  • Volodymyr Boyko
  • Immanuel Willerich
  • Andreas Menzel
  • Christian Moitzi
  • Bernd Reck
  • Peter Schurtenberger
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysikalisk kemi
Originalspråkengelska
Sidor (från-till)10346-10359
TidskriftLangmuir
Volym29
Utgåva nummer33
StatusPublished - 2013
PublikationskategoriForskning
Peer review utfördJa