期刊
ADVANCES IN COLLOID AND INTERFACE SCIENCE
卷 222, 期 -, 页码 110-118出版社
ELSEVIER
DOI: 10.1016/j.cis.2014.07.006
关键词
Nonlinear interfacial rheology; Surface dilational modulus; Surface dilational viscoelasticity; Fourier spectral analysis; Lissajous plots; Stress decomposition
资金
- ESA Project, Fundamental and Applied Studies of Emulsion Stability [MAP AO-99-052]
- FASES project (ESTEC) [14291/00/NL/SH]
- ESA Project, PArticle STAbilized Emulsions and Foams (PASTA) [AO-2009-813]
- Saint-Petersburg State University [12.38.241.2014]
- Russian Foundation of Basic Research (RFFI) [14-03-00670_a]
- Italian Space Agency [ASI/I-001/11/0, 2013-028-R.0]
The interfacial tension response to dilational deformation of interfacial area exhibits a (more or less) nonlinear behavior, depending on the amplitude of the deformation. Studies of such observable interfacial properties in the nonlinear domain suggest valuable information about the two-dimensional microstructure of the interfacial layer, as well as about the structure time-evolution. In this article, the emphasis is centered on the available mathematical methods for quantitatively analyzing and describing the magnitude and the characteristics of the nonlinear interfacial viscoelastic properties. Specifically, in periodic oscillation experiments the nonlinear behavior can be represented by the combination of a linear part (the surface dilational modulus), with an additional complementary Fourier analysis parameterizing the nonlinearity. Also asymmetric Lissajous plots, of interfacial tension versus deformation, are useful tools for expanding the response nonlinearity into four distinct components relevant to significant points of the cyclic loop. In connection with the mathematical methods, nonequilibrium thermodynamic formulations provide a powerful theoretical framework for investigating the interfacial dynamic properties of multiphase systems. Experimental results for adsorption layers of complex components, available in the literature, show notable nonlinear interfacial viscoelastic behavior. In particular in this review, data are illustrated for solutions of polymers and of polyelectrolyte/surfactant complexes. The observed nonlinear findings reveal formation of complexes, patches, and other different interfacial structures. (C) 2014 Elsevier B.V. All rights reserved.
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