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Rheology is the science of deformation and flow of matter, especially liquids and soft matter. The present chapter is dedicated to the analysis of rheological characteristics of various systems such as nanofluids, aggregates or agglomerates of nanoparticles, gels, nanofiber suspensions, nanoparticle-polymer suspensions, and various polymer nanocomposites.Īurélie Taguet, in Compatibilization of Polymer Blends, 2020 16.1 Introduction Hence rheological characterization of polymer nanocomposites offers original means to assess the state of the dispersion of filler in nanocomposites and to investigate the influence of flow conditions on nanofiller dispersion itself. The melt rheological properties of filled polymers are very sensitive to the structure, concentration, particle size, and shape and surface characteristics of the fillers. It is well-known that the rheology is very important to every material because the rheological responses are closely related to final structures of the system. Rheological characterization of materials gives an overall idea about the viscoelastic flow behavior of the system. Rheology is the study of deformation and flow of matter. Thomas, in Micro and Nano Fibrillar Composites (MFCs and NFCs) from Polymer Blends, 2017 14.1 Introduction These impose a significant influence on the rheology of the cement mix: the packing density, the surface area of the raw materials, as well as the final geometric configuration of the cementitious materials. The parameters that control the rheology of a cement paste can be classified into two groups: chemical and physical. The successful extrudability of cement-based materials requires control of the process and rheological parameters ( Kuder & Shah, 2010).

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The application of rheological concepts in pastes is of fundamental importance to enable easy molding and free of defects, to minimize the occurrence of cracks, detachment, and stains, possibly caused by inappropriate rheological behavior for the application ( Cardoso, Pileggi, & John, 2005). The evaluation of the rheological behavior of the material is carried out using rheometers equipment specially developed for readings of the resulting shear stress to obtain the initial yield stress and viscosity ( Rubio-Hernández, 2018). Viscosity is the resistance presented by the material opposing the movement of the system. The initial drainage stress is the stress necessary to start the drainage, but not all materials have drainage stress, such as water. There are two fundamental aspects in rheology to describe a material, the viscosity, and yield stress caused by shear stress ( Glatthor & Schweizer, 1994). Rheology is dedicated to the study of the deformation and flow of matter. Holmer Savastano Junior, in Advances in Bio-Based Fiber, 2022 32.6.2.2 Rheology

Viscosity meaning