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Hypothesis: Aging in colloidal suspensions manifests as a reduction inkinetic freedom of the colloids. In aqueous suspensions of charged colloids,the role of inter-particle electrostatics interactions on the aging dynamics iswell debated. Despite water being the dispersion medium, the influence of waterstructure on the physicochemical properties of aging colloids has never beenconsidered before. Laponite, a model hectorite clay, could be used to evaluatethe relative contributions of medium structure and electrostatics indetermining the physicochemical properties of aging colloidal suspensions.  Experiments: The structure of the dispersion medium is modified either byincorporating uncharged/charged kosmotropic (structure-inducing) or chaotropic(structure-disrupting) molecules or by changing suspension temperature. A newprotocol, wherein the medium is heated before adding clay particles, is alsointroduced to evaluate the effects of hydrogen bond disruptions on suspensionaging. Dynamic light scattering, rheological measurements and particle-scaleimaging are employed to evaluate the physicochemical properties of thesuspensions.  Findings: A strong influence of medium structure is evident wheninter-particle electrostatic interactions are weak. Enhancement and disruptionof hydrogen bonds in the medium are, respectively, strongly correlated withacceleration and delay of suspension aging dynamics. The physicochemicalproperties of charged clay colloidal suspensions are therefore controlled byaltering hydrogen bonding in the dispersion medium.

Influence of dispersion medium structure on the physicochemical  properties of aging colloidal suspensions investigated using the synthetic  clay Laponite