Interfacial rheology: From fundamentals to application
[Webinar] Professor Gerald G Fuller
Complex fluid-fluid interfaces arise whenever constituents (molecular and colloidal) residing within bulk phases become adsorbed and, in many cases, strongly interact. When this occurs, the mechanical response of a fluid interface can become highly nonlinear and time-dependent. Examples of such rheologically complex interfaces are found in biology (the tear film, lung surfactants, and biofilms), personal and food products (foams and emulsions), and industry (hydrates). This webinar introduces the thermodynamics, microstructure, and mechanical response of such interfaces. It begins with a discussion of the phase behavior of these systems and develops the basic equations and analysis of capillarity. This is followed by a description of interfacial viscoelasticity in both shear and dilatational modes of deformation. The instrumentation (the interfacial stress rheometer and dilating drop device) are described. The application of this instrumentation to solve problems in human health, personal product design, and the environment are described.