title: Drying of a charge-stabilized colloidal suspension in situ monitored by vertical small-angle X-ray scattering.
abstract: We report a first application of vertical small-angle X-ray scattering to investigate the drying process of a colloidal suspension by overcoming gravity related restrictions. From the observation of the drying behavior of charge-stabilized colloidal silica in situ, we find the solidification of the colloidal particles exhibits an initial ordering, followed by a sudden aggregation when they overcome an electrostatic energy barrier. The aggregation can be driven not only by capillary pressure but also by thermal motion of the particles. The dominating contribution is determined by the magnitude of the energy barrier at the transition, which significantly decreases during drying due to an increased ionic strength.
authors.affiliation: Department of Chemical Engineering, KU Leuven, W. de Croylaan 46, B-3001, Heverlee, Belgium.
authors.forename: Sunhyung
authors.initials: S
authors.lastname: Kim
authors.forename: Kyu
authors.initials: K
authors.lastname: Hyun
authors.forename: Yun Soo
authors.initials: YS
authors.lastname: Kim
authors.forename: Bernd
authors.initials: B
authors.lastname: Struth
authors.forename: Christian
authors.initials: C
authors.lastname: Clasen
authors.forename: Kyung Hyun
authors.initials: KH
authors.lastname: Ahn
mesh_terms: D003102:Colloids / Q000737:chemistry; D053838:Scattering, Small Angle; D012822:Silicon Dioxide / Q000737:chemistry*; D013535:Suspensions / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D003102:Colloids; D013535:Suspensions; D012822:Silicon Dioxide