Microstructure and nonlinear signatures of yielding in a heterogeneous colloidal gel under large amplitude oscillatory shear

Shear localisation in interfacial particle layers and its influence on Lissajous-plots

“…This flow can also be seen as a part of a superposition of a linear behaviour and wall slip according to Klein et al (2007). The behaviour of group III is in good agreement with the "broad yielding transition" reported by Kim et al (2014). In this region, larger domains break up and let the system flow whereas in the region before (group II in this work) only single connections break without a flowing of the system.…”

“…The shapes are comparable with soft spheres of van der Vaart et al (2013). Kim et al (2014) provide a more suitable explanation for this saddle-like shape. In the "post-yielding flow" region, the whole system breaks into smaller clusters and does not rebuild connections.…”

“…For soft spheres, a second maximum was recorded, which was explained by a rejuvenation of the system. Kim et al (2014) combined similar measurements with small angle neutron scattering (SANS) and …”

“…Also, Klein et al (2007) provides a classification scheme based on a superposition of four different basic effects including wall slip to analyze the data. Visualisation methods such as SANS or optical coherence tomography (OCT) in combination with rheological methods were used to measure and quantify wall slip effects (Sorvari et al 2014) or morphological changes (Kim et al 2014). Within this framework, this contribution aims to link the nonlinear rheological response function and optical visualization of two differently aggregated particle systems at the air-water interface to capture the interfacial movements during oscillatory shear flow.…”

Shear-induced clustering of Brownian colloids in associative polymer networks at moderate Péclet number

“…This surfactant concentration was chosen in order to produce viscoelasticity in the nanoemulsions at low temperature [23]. For rheo-SANS measurements, the nanoemulsion was prepared in 82/18 (v/v) H2O/D2O in order to match the scattering length density of the solvent to that of the polymer and reduce multiple scattering from the droplets [34]. The average radius of droplets measured by DLS depends on the sample to sample difference (<a> = 34.6 nm for φp = 0.33, <a> = 31.7 nm for φp = 0.36, and <a> = 35.4 nm for φp = 0.40).…”