Anomalous rheological aging of a model thermoreversible colloidal gel following a thermal quench
| Author(s) | Suman, Khushboo | |
| Author(s) | Wagner, Norman J. | |
| Date Accessioned | 2022-07-06T14:47:27Z | |
| Date Available | 2022-07-06T14:47:27Z | |
| Publication Date | 2022-06-15 | |
| Description | The following article has been submitted to/accepted by The Journal of Chemical Physics. After it is published, it will be found at https://doi.org/10.1063/5.0094237. | en_US |
| Abstract | We investigate the aging behavior in a well-studied model system comprised of a colloidal suspension of thermoreversible adhesive hard spheres (AHS) but thermally quenched below the gel transition to much larger depths than previously studied. The aging behavior in the model AHS system is monitored by small amplitude oscillatory shear rheology measurements conducted while rapidly quenching from liquid state at 40{degree sign}C to a temperature below the gel temperature and new, anomalous aging behaviors are observed. Shallow quenches lead to monotonic development of the elastic modulus with time consistent with prior reports for the development of a homogeneous gel (Gordon et al., Journal of Rheology 2017). However, for deeper quenches, a unique and new phenomenon is reported - namely after an initial rise in the modulus, a reproducible drop in modulus is observed, followed by a plateau in modulus value. This drop can be gradual or sudden, and the extent of the drop, both depends on quench depth. After this drop in modulus, AHS gel evolves toward a quench-path independent state over the experimental timescale. These effects of the extent of quenching on aging behavior is hypothesized to be a consequence of quenching into different underlying thermodynamic states of colloidal gels and the possible influence of the adhesive glass dynamical arrest for the deepest quenches. The research connects homogeneous gelation with heterogeneous gel formation due to phase separation and shows that the extent of quench can be used as an independent parameter to govern the rheological response of the arrested gel. | en_US |
| Sponsor | The authors acknowledge the help of Ms. Haesoo Lee in sample preparation. This manuscript was prepared under cooperative agreement #370NANB17H302 from NIST, U.S. Department of Commerce. The statements, findings, conclusions and recommendations are those of the authors and do not necessarily reflect the view of NIST or the U.S. Department of Commerce. | en_US |
| Citation | Suman, Khushboo, and Norman J Wagner. “Anomalous Rheological Aging of a Model Thermoreversible Colloidal Gel Following a Thermal Quench.” The Journal of Chemical Physics, June 15, 2022, 5.0094237. https://doi.org/10.1063/5.0094237. | en_US |
| ISSN | 1089-7690 | |
| URL | https://udspace.udel.edu/handle/19716/31067 | |
| Language | en_US | en_US |
| Publisher | The Journal of Chemical Physics | en_US |
| Title | Anomalous rheological aging of a model thermoreversible colloidal gel following a thermal quench | en_US |
| Type | Article | en_US |
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