Abstract
The mechanical properties of dispersed systems, such as suspensions, emulsions and foams, have been studied for many years by oscillatory shear experiments in the linear regime using material functions as for example the frequency dependent storage and loss modulus. In the context of oscillatory shear tests, the linear regime is defined as the range of strain amplitudes where both excitation and response wave signals are sinusoidal and their amplitudes are proportional to each other. In this regime the connection between the material functions and the dispersed system’s microstructure is well understood. However, dispersed systems are often processed or applied at conditions, where the linear regime is easily exceeded and the storage and loss moduli become insufficient to describe the material’s mechanical properties. In addition, the nonlinear regime opens up enhanced characterization possibilities. Consequently, experimental protocols for Large Amplitude Oscillatory Shear (LAOS) have been developed to investigate and quantify this nonlinear behavior. In the following chapter we present basic theoretical descriptions of LAOS experiments, address technical aspects of the technique for systems with low viscosity and discuss three applications to dispersed systems: First, LAOS experiments were used to modify the droplet morphology in a dilute polymer blend which gave information about the ratio of droplet radius to the interfacial tension in the system. Second, LAOS experiments were used to test the predictive capabilities of the schematic MCT model for dense colloidal suspensions under nonlinear deformation. Third, the yielding behavior of a colloidal nanoemulsion gel under oscillatory shear was investigated and the results were combined with a structural analysis using ultra-small angle neutron scattering. The two techniques allowed to propose a detailed microstructural mechanism for yielding of the gel and revealed that large scale inhomogeneities play a significant role for its mechanical properties.
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Merger, D. et al. (2015). Large Amplitude Oscillatory Shear Applications for the Characterization of Dispersed Systems. In: Kind, M., Peukert, W., Rehage, H., Schuchmann, H. (eds) Colloid Process Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-15129-8_6
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DOI: https://doi.org/10.1007/978-3-319-15129-8_6
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