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Particle laden fluid interfaces: Dynamics and interfacial rheology
journal contributionposted on 13.07.2017 by Alma J. Mendoza, Eduardo Guzman, Fernando Martinez-Pedrero, Hernan Ritacco, Ramon Rubio, Francisco Ortega, Victor Starov, Reinhard Miller
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Wereviewthe dynamics of particle laden interfaces, both particlemonolayers and particle+surfactantmonolayers. We also discuss the use of the Brownian motion of microparticles trapped at fluid interfaces for measuring the shear rheology of surfactant and polymer monolayers. We describe the basic concepts of interfacial rheology and the different experimental methods for measuring both dilational and shear surface complex moduli over a broad range of frequencies, with emphasis in the micro-rheology methods. In the case of particles trapped at interfaces the calculation of the diffusion coefficient from the Brownian trajectories of the particles is calculated as a function of particle surface concentration.We describe in detail the calculation in the case of subdiffusive particle dynamics. A comprehensive review of dilational and shear rheology of particle monolayers and particle+surfactant monolayers is presented. Finally the advantages and current open problems of the use of the Brownian motion ofmicroparticles for calculating the shear complex modulus of monolayers are described in detail.
This work was supported in part by MINECO under grant FIS2012-28231-C02-01, by ESA under grants FASES and PASTA, and by COST Action CM1101. F.M-P.
- Aeronautical, Automotive, Chemical and Materials Engineering
- Chemical Engineering