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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8674
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dc.contributor.authorParmar, Vaibhav Raj Singh-
dc.contributor.authorBandyopadhyay, Ranjini-
dc.date.accessioned2026-02-27T11:13:34Z-
dc.date.available2026-02-27T11:13:34Z-
dc.date.issued2024-11-11-
dc.identifier.citationPhysics of Fluids, 2024, Vol. 36, AR No. 113114en_US
dc.identifier.issn1089-7666-
dc.identifier.urihttp://hdl.handle.net/2289/8674-
dc.descriptionOpen Access.en_US
dc.description.abstractClay, the major ingredient of natural soils, is used as a rheological modifier while formulating paints and coatings. When subjected to desiccation, colloidal clay suspensions and clayey soils crack due to the accumulation of drying-induced stresses. Even when desiccation is suppressed, aqueous clay suspensions exhibit physical aging, with their elastic and viscous moduli increasing over time as the clay particles self-assemble into gel-like networks due to time-dependent inter-particle screened electrostatic interactions. The rate of evolution of the suspension structures and therefore of the mechanical moduli can be controlled by changing clay concentration or by incorporating additives. Since physical aging and desiccation should both contribute to the consolidation of drying clay suspensions, we manipulate the desiccation process via alterations of clay and additive concentrations. For a desiccating sample with an accelerated rate of aging, we observe faster consolidation into a semi-solid state and earlier onset of cracks. We estimate the crack onset time, tc⁠, in direct visualization experiments and the elasticity of the drying sample layer, E, using microindentation in an atomic force microscope. We demonstrate that tc ∝ √Gc/E⁠, where Gc⁠, the fracture energy, is estimated by fitting our experimental data to a linear poroelastic model that incorporates the Griffith's criterion for crack formation. Our work demonstrates that early crack onset is associated with lower sample ductility. The correlation between crack onset in a sample and its mechanical properties as uncovered here is potentially useful in preparing crack-resistant coatings and diverse clay structures.en_US
dc.language.isoenen_US
dc.publisherPhysics of Fluidsen_US
dc.relation.urihttps://doi.org/10.48550/arXiv.2407.01396en_US
dc.relation.urihttps://doi.org/10.1063/5.0238609en_US
dc.rights© 2024 Author(s)en_US
dc.subjectColloidal systemsen_US
dc.subjectFracture mechanicsen_US
dc.subjectMaterials analysisen_US
dc.subjectMechanical propertiesen_US
dc.subjectAtomic force microscopyen_US
dc.subjectTensile stressen_US
dc.subjectCrack formationen_US
dc.subjectViscoelasticityen_US
dc.titleManipulating crack formation in air-dried clay suspensions with tunable elasticityen_US
dc.typeArticleen_US
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