Journal ArticleDOI
Centro‐symmetric technique for measuring shear modulus, viscosity, and surface tension of spread monolayers
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TLDR
In this paper, a Teflon cup 12.7 cm (5.4 in) in inner diameter with sloping interior sides is used to measure the shear modulus, the viscosity, and the surface pressure of a monomolecular film on water under a hydrostatic compression.Abstract:
We have constructed an apparatus which enables one to measure, simultaneously, the shear modulus, the viscosity, and the surface pressure of a monomolecular film on water under a hydrostatic compression. It is particularly suitable for measurements of the static shear modulus of insoluble monolayers. A capillary wave generator/detector system was also incorporated to determine the surface pressure. The trough is a Teflon cup 12.7 cm (5.4 in.) in inner diameter with sloping interior sides. As the cup is raised, while maintaining the water elevation fixed, the film is uniformly compressed. A rotor suspended at the center from a fine torsion fiber is used to measure the mechanical properties (surface viscosity and/or surface shear modulus). To measure the quasistatic shear properties, the cup is rotated through a small angle and the residual deflection of the rotor determined. Dynamic shear response is probed by studying transient torsional oscillations following a sudden angular displacement of the torsion ...read more
Citations
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Dilational and shear rheology of adsorption layers at liquid interfaces
TL;DR: In this paper, an overview of the literature on shear and dilational rheology at liquid interfaces is presented, along with a discussion of specific theoretical aspects necessary to interpret experiments.
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Interfacial shear rheology of protein–surfactant layers
TL;DR: The aim of this contribution is to give a literature overview of interfacial shear rheological studies of pure protein and protein/surfactant mixtures at liquid interfaces measured with different techniques.
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Interfacial layers of stimuli-responsive poly-(N-isopropylacrylamide-co-methacrylicacid) (PNIPAM-co-MAA) microgels characterized by interfacial rheology and compression isotherms
TL;DR: These pH dependent visco-elastic properties of the microgel layer at the oil-water interface play a determining role in the stability of emulsion droplets and allow us to prepare very stable emulsions when the microgels are charged and to break the emulsion by changing the pH.
Journal ArticleDOI
Tensiometry and rheology of complex interfaces
NO Nick Jaensson,Jan Vermant +1 more
TL;DR: In this paper, the authors review progress made in particular for complex fluid-fluid interfaces where rheological stresses, peculiar to the interface, play an important role, and discuss how simple complex flows, such as thin film and drainage flows, offer a first step up in complexity and seem to present a good benchmark problem for testing constitutive equations and the interplay between transport phenomena, interfacial rheology and the changes in state variables.
Journal ArticleDOI
Torsion balances, torsion pendulums, and related devices
TL;DR: The torsion pendulum is not only a mainstay instrument in the world of precision measurement and gravitational physics, but is important in electrical science, biophysics, petrology, metallurgy, and various other fields of endeavor as discussed by the authors.
References
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Book ChapterDOI
Ordering in Two Dimensions
TL;DR: In the last few years, the study of phase transitions in two-dimensional systems has absorbed a great deal of effort by both theorists and experimentalists as discussed by the authors, with the increase of the sensitivity of experiments, which can now be checked by the experimentalists.
Journal ArticleDOI
The Effect of Dissolved Salts on Insoluble Monolayers
Journal ArticleDOI
Novel technique for dynamic surface tension and viscosity measurements at liquid-gas interfaces.
TL;DR: A novel means of generating and detecting surface waves at liquid-gas interfaces has been successfully developed using Electrocapillarity through specular reflection of a laser beam from the fluid surface to a position sensitive photodiode.