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Structures, stresses, and fluctuations in the delayed failure of colloidal gels
Linköping University, Department of Management and Engineering, Mechanics. Linköping University, The Institute of Technology. School of Engineering and Applied Sciences, Harvard University, Cambridge, USA.ORCID iD: 0000-0002-1503-8293
School of Engineering and Applied Sciences, Harvard University, Cambridge, USA.
School of Engineering and Applied Sciences, Harvard University, Cambridge, USA and Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Wageningen, the Netherlands.
School of Engineering and Applied Sciences, Harvard University, Cambridge, USA.
2012 (English)In: Soft Matter, ISSN 1744-683X, Vol. 8, no 13, 3657-3664 p.Article in journal (Refereed) Published
Abstract [en]

Sample-spanning networks of aggregated colloidal particles have a finite stiffness and deform elastically when subjected to a small shear stress. After some period of creep, these gels ultimately suffer catastrophic failure. This delayed yielding is governed by the association and dissociation dynamics of interparticle bonds and the strand structure of the gel. We derive a model which connects the kinetics of the colloids to the erosion of the strand structure and ultimately to macroscopic failure. Importantly, this model relates time-to-failure of the gel to an applied static stress. Model predictions are in quantitative agreement with experiments. It is predicted that the strand structure, characterized by its mesh size and strand coarseness, has a significant impact on delay time. Decreasing the mesh size or increasing the strand thickness makes colloidal gels more resilient to delayed yielding. The quench and flow history of gels modifies their microstructures. Our experiments show that a slow quenching increases the delay time due to the coarsening of the strands; by contrast, preshear reduces the delay time, which we explain by the increased mesh size as a result of shear-induced fracture of strands.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2012. Vol. 8, no 13, 3657-3664 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-76202DOI: 10.1039/c2sm06723dISI: 000301198100020OAI: diva2:513094

Funding Agencies|Alf de Ruvo Memorial Foundation of SCA AB||Netherlands Organization for Scientific Research (NWO)||Harvard MRSEC|DMR-0820484|NSF|DMR-1006546|

Available from: 2012-03-30 Created: 2012-03-30 Last updated: 2016-05-04Bibliographically approved

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