title: Particle laden fluid interfaces: dynamics and interfacial rheology.
abstract: We review the dynamics of particle laden interfaces, both particle monolayers and particle+surfactant monolayers. 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 of microparticles for calculating the shear complex modulus of monolayers are described in detail.
authors.affiliation: Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain.
authors.forename: Alma J
authors.initials: AJ
authors.lastname: Mendoza
authors.affiliation: CNR-Istituto per L'Energetica e l'Interfase, Via De Marini 6, Genova, Italy. Electronic address: e.guzman@ge.ieni.cnr.it.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Guzmán
authors.affiliation: Campus Internacional de Excelencia, Universidad Complutense, 28040 Madrid, Spain.
authors.forename: Fernando
authors.initials: F
authors.lastname: Martínez-Pedrero
authors.affiliation: Departamento de Física, Universidad Nacional del Sur, Alem 1253, CP 8000 Bahía Blanca, Buenos Aires, Argentina.
authors.forename: Hernán
authors.initials: H
authors.lastname: Ritacco
authors.affiliation: Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain. Electronic address: rgrubio@quim.ucm.es.
authors.forename: Ramón G
authors.initials: RG
authors.lastname: Rubio
authors.affiliation: Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain. Electronic address: fortega@quim.ucm.es.
authors.forename: Francisco
authors.initials: F
authors.lastname: Ortega
authors.affiliation: Department of Chemical Engineering, Loughborough University, LE11 3TU Loughborough, UK.
authors.forename: Victor M
authors.initials: VM
authors.lastname: Starov
authors.affiliation: Max Planck Institute for Colloids and Interfaces, Potsdam-Golm, Germany.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Miller
keywords: Diffusion coefficient of trapped particles; Interfacial dilational and shear rheology; Interfacial microrheology; Particle laden interfaces; Rheology of particle–surfactant monolayers