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The rheological manifestation of intra-cycle microstructural change of a model colloidal gel under oscillatory shearing is studied with Brownian dynamics simulation and a fully quantitative sequence of physical process (SPP) technique. The microstructural change of the model colloidal gels is identified with the rigidity concept and correlated with the rheological behavior quantified via the SPP metrics. The model colloidal gel exhibits complex nonlinear stress response in the large amplitude os

The transient structural and rheological behavior of soft glassy materials out of equilibrium is studied under small, medium, and large amplitude oscillatory shearing and interpreted via the fully quantitative sequence of physical processes (SPP) technique. We identify features of the local strain distribution that cause particular rheological responses and show that the SPP metrics accurately reflect the structural transitions. The SPP modulus is shown to reflect how much of the imposed strain

The dynamics and rheological behavior of colloidal gels under oscillatory shear flow have been studied by using the Brownian dynamics simulations. The dynamics is studied under the oscillatory shear of small, medium, and large amplitudes. In the small amplitude oscillatory shear (SAOS) regime, the colloidal gel retains a rigid-chain network structure. The colloidal gel oscillates with small structural fluctuations and the elastic stress shows a linear viscoelastic response. In the medium amplitu

The microstructural evolution of the colloidal gel at intermediate volume fraction (15%) under start-up of shear flow has been studied by using the Brownian dynamics simulation method. The structural change was analyzed from three points of view, on cluster length scale, on local length scale and on anisotropy. Correlating the stress change which showed stress overshoot with the structural change on the cluster length scale, a mismatch between the initiation of the structural rupture and the str

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Jun Dong Park, Kyung Hyun Ahn, Norman J. Wagner; Structure-rheology relationship for a homogeneous colloidal gel under shear startup. J. Rheol. 1 January 2017; 61 (1): 117–137. https://doi.org/10.1122/1.4971993 Download citation file: Ris (Zotero) Reference Manager EasyBib Book

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Polymers adsorbed on nanoparticles (NPs) are important elements that determine the dispersion of NPs in polymer nanocomposite (PNC) films. While previous studies have shown that increasing the number of adsorbed polymers on NPs can improve their dispersion during the drying process, the exact mechanism remained unclear. In this study, we investigated the role of adsorbed polymers in determining the microstructure and dispersion of NPs during the drying process. Investigation of the structural de

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