Shear rheology of fluid interfaces: Closing the gap between macro- and micro-rheology

Guzmán, Eduardo; Tajuelo, Javier; Pastor, Juan Manuel; Rubio, Miguel A.; Ortega, Francisco; Rubio, Ramón G.

doi:10.1016/j.cocis.2018.05.004

Cited by 42 publications

(27 citation statements)

References 70 publications

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“…This method relies on the measurement of the force felt by a micrometric particle moving in the plane parallel to the interface at a given particle-interface distance using an optical trap. Such methodology overcomes the ambiguity of interface macrorheology while keeping the analysis simpler than in contact microrhelogy, as it avoids the issue related to the understanding of the not trivial interaction between the interface and the particle probe [32] [33]. Some articles have been dedicated to analyze this opportunity [34,35], which allows the study of the rheological properties even of phases with very low viscosity (≈ 10 −9 N.s.m −1 ).…”

Section: Towards Contactless Surface Microrheologymentioning

confidence: 99%

Motion of micro- and nano- particles interacting with a fluid interface

Villa

Boniello

Stocco

et al. 2020

Advances in Colloid and Interface Science

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In this article, we review both theoretical models and experimental results on the motion of micro-and nanoparticles that are close to a fluid interface or move in between two fluids. Viscous drags together with dissipations due to fluctuations of the fluid interface and its physicochemical properties affect strongly the translational and rotational drags of colloidal particles, which are subjected to Brownian motion in thermal equilibrium. Even if many theoretical and experimental investigations have been carried out, additional scientific efforts in hydrodynamics, statistical physics, wetting and colloid science are still needed to explain unexpected experimental results and to measure particle motion in time and space scales, which are not accessible so far.

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Section: Towards Contactless Surface Microrheologymentioning

confidence: 99%

Motion of micro- and nano- particles interacting with a fluid interface

Villa

Boniello

Stocco

et al. 2020

Advances in Colloid and Interface Science

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“…From a practical point of view, an essential characteristic of each of the above-mentioned ISRs is their respective measuring range in a parameter space defined by η s , η s , and ω. In this aspect, assessing the performance of the flow field based-iterative process is of paramount importance, particularly in the case of the bicone ISR, due to the comparatively higher role played by the subphase because of the larger subphase contact with the probe's lower surface, which renders comparatively lower values of Bo * [9]. Limited studies [20,23] of the available measuring range and the errors introduced by the iterative process have been made in the case of the bicone ISR.…”

Section: Check Convergence Criterionmentioning

confidence: 99%

“…A full characterization of the mechanical properties of plane interfacial systems requires studying the mechanical response in two deformation modes [8][9][10], namely shear mode, which keeps the area constant while allowing for shape changes [9], and dilatational mode, which keeps the shape unchanged while allowing for area changes [10]. In this report, we will restrict ourselves to the shear deformation mode.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Measurements with the Bicone Interfacial Shear Rheometer: Numerical Bench-Marking of Flow Field-Based Data Processing

Sánchez-Puga

Tajuelo

Pastor

et al. 2018

Colloids and Interfaces

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Flow field-based methods are becoming increasingly popular for the analysis of interfacial shear rheology data. Such methods take properly into account the subphase drag by solving the Navier–Stokes equations for the bulk phase flows, together with the Boussinesq–Scriven boundary condition at the fluid–fluid interface and the probe equation of motion. Such methods have been successfully implemented on the double wall-ring (DWR), the magnetic rod (MR), and the bicone interfacial shear rheometers. However, a study of the errors introduced directly by the numerical processing is still lacking. Here, we report on a study of the errors introduced exclusively by the numerical procedure corresponding to the bicone geometry at an air–water interface. In our study, we set an input value of the complex interfacial viscosity, and we numerically obtained the corresponding flow field and the complex amplitude ratio for the probe motion. Then, we used the standard iterative procedure to obtain the calculated complex viscosity value. A detailed comparison of the set and calculated complex viscosity values was made in wide ranges of the three parameters herein used, namely the real and imaginary parts of the complex interfacial viscosity and the frequency. The observed discrepancies yield a detailed landscape of the numerically-introduced errors.

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“…For intermediate

the material response contains both bulk, given by phases 1 and 2, and biofilm contributions to the interfacial flow [ 33 ] (see also the method description ahead). Defining the lower measurable limits,

, of interfacial rheological techniques is not a trivial matter and depends, among others, on the measuring geometry, measurement instrument, and so on, as highlighted in [ 34 , 35 , 36 ]. In this work, we use

, as previously used in similar studies in terms of experimental setup and materials [ 33 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

The Exo-Polysaccharide Component of Extracellular Matrix is Essential for the Viscoelastic Properties of Bacillus subtilis Biofilms

Pandit

Fazilati

Gąska

et al. 2020

IJMS

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Bacteria are known to form biofilms on various surfaces. Biofilms are multicellular aggregates, held together by an extracellular matrix, which is composed of biological polymers. Three principal components of the biofilm matrix are exopolysaccharides (EPS), proteins, and nucleic acids. The biofilm matrix is essential for biofilms to remain organized under mechanical stress. Thanks to their polymeric nature, biofilms exhibit both elastic and viscous mechanical characteristics; therefore, an accurate mechanical description needs to take into account their viscoelastic nature. Their viscoelastic properties, including during their growth dynamics, are crucial for biofilm survival in many environments, particularly during infection processes. How changes in the composition of the biofilm matrix affect viscoelasticity has not been thoroughly investigated. In this study, we used interfacial rheology to study the contribution of the EPS component of the matrix to viscoelasticity of Bacillus subtilis biofilms. Two strategies were used to specifically deplete the EPS component of the biofilm matrix, namely (i) treatment with sub-lethal doses of vitamin C and (ii) seamless inactivation of the eps operon responsible for biosynthesis of the EPS. In both cases, the obtained results suggest that the EPS component of the matrix is essential for maintaining the viscoelastic properties of bacterial biofilms during their growth. If the EPS component of the matrix is depleted, the mechanical stability of biofilms is compromised and the biofilms become more susceptible to eradication by mechanical stress.

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Shear rheology of fluid interfaces: Closing the gap between macro- and micro-rheology

Cited by 42 publications

References 70 publications

Motion of micro- and nano- particles interacting with a fluid interface

Motion of micro- and nano- particles interacting with a fluid interface

Dynamic Measurements with the Bicone Interfacial Shear Rheometer: Numerical Bench-Marking of Flow Field-Based Data Processing

The Exo-Polysaccharide Component of Extracellular Matrix is Essential for the Viscoelastic Properties of Bacillus subtilis Biofilms

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