title: Structure and dynamics of soft repulsive colloidal suspensions in the vicinity of the glass transition.
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.
authors.affiliation: Physical Chemistry, Department of Chemistry, Lund University, 221 00 Lund, Sweden. jerome.crassous@fkem1.lu.se
authors.forename: Jérôme J
authors.initials: JJ
authors.lastname: Crassous
authors.forename: Lucia
authors.initials: L
authors.lastname: Casal-Dujat
authors.forename: Martin
authors.initials: M
authors.lastname: Medebach
authors.forename: Marc
authors.initials: M
authors.lastname: Obiols-Rabasa
authors.forename: Romaric
authors.initials: R
authors.lastname: Vincent
authors.forename: Frank
authors.initials: F
authors.lastname: Reinhold
authors.forename: Volodymyr
authors.initials: V
authors.lastname: Boyko
authors.forename: Immanuel
authors.initials: I
authors.lastname: Willerich
authors.forename: Andreas
authors.initials: A
authors.lastname: Menzel
authors.forename: Christian
authors.initials: C
authors.lastname: Moitzi
authors.forename: Bernd
authors.initials: B
authors.lastname: Reck
authors.forename: Peter
authors.initials: P
authors.lastname: Schurtenberger
mesh_terms: D003102:Colloids / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D013535:Suspensions / Q000737:chemistry*
chemical_list: D003102:Colloids; D013535:Suspensions