Results 151 to 160 of about 23,447 (195)
Interfacial Shear Rheology of Mixed Polyelectrolyte−Surfactant Layers
Langmuir, 2009 We have studied the shear rheology of mixed surface layers containing polyelectrolytes and surfactants of opposite charges. The layers containing rigid polyelectrolytes are solidlike and can even exhibit brittle behavior. More flexible polyelectrolytes lead to more viscoelastic layers and very flexible ones to purely viscous layers.
G. P. Espinosa, D. Langévin
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Interfacial shear rheology of highly confined glassy polymers
Soft Matter, 2011 We present results on interfacial shear rheology measurements on Langmuir monolayers of two different polymers, poly(vinyl acetate) and poly(methyl methacrylate) as a function of surface concentration and temperature. While for the high glass transition poly(methyl methacrylate) polymer we find a systematic transition from a viscous dominated regime to
Sunita Srivastava +3 more
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Shear Effects in Interfacial Rheology and Their Implications on Oscillating Pendant Drop Experiments
Langmuir, 2005 Adsorbed molecules that associate or entangle with one another at the fluid interface will give rise to shearing resistance (i.e., resistance to shape change at constant area) on the continuum scale. Where these shear effects occur, familiar theoretical constructs, such as the Young-Laplace equation or the complex dilational modulus, are rendered ...
Anthony Yeung, Lichun Zhang
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Physics of Fluids, 2018 We present a nonlinear rheological investigation of model rod-like particles at the air/water interface in dilatation and shear. Cellulose nanocrystals were modified to vary their surface hydrophobicity, creating a range of surface-active particles with varying contact angle.
Merel E. H. van den Berg +4 more
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Interfacial shear rheology of DPPC under physiologically relevant conditions
Soft Matter, 2013 Lipids, and phosphatidylcholines in particular, are major components in cell membranes and in human lung surfactant. Their ability to encapsulate or form stable layers suggests a significant role of the interfacial rheological properties. In the present work we focus on the surface rheological properties of dipalmitoylphosphatidylcholine (DPPC ...
Eline Hermans, Jan Vermant
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Food Hydrocolloids, 2007 Human whole saliva (HWS) is a complex physiological secretion that performs a number of essential functions such as protection of oral health, lubrication of mouth tissues, as well as predigestion of food. In addition, saliva forms the perireceptor environment of the oral cavity and, by its interactions with food and beverages, influences the ...
Damiano Rossetti +4 more
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Journal of Rheology, 2017 Asphaltenes are surface-active polyaromatic molecules in crude oil that are known to deposit in pipelines or stabilize water droplets by flocculating at interfaces resulting highly viscous emulsions, leading to significant flow assurance problems. Commercial dispersants have been developed to disturb asphaltene aggregation to mitigate deposition, but ...
Yu‐Jiun Lin +5 more
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Journal of Dispersion Science and Technology, 2013 This article studies the applicability of a new technique in determining the interfacial shear rheology properties of surface active compounds relevant to the petroleum industry. It presents the theory behind the determination of the rheological parameters and the results of tests performed on a set of petroleum related compounds (asphaltenes, tetra ...
Mehdi Benmekhbi, Sébastien Simon
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Langmuir, 2005 The effect of pH on the adsorption of catalase and lysozyme at the air-water interface has been studied using a combined surface pressure-interfacial shear rheology technique. The results presented show that the rate of development of interfacial phenomena increases as the pH of the subphase approaches the isoelectric point of the protein under ...
Simon Roberts +4 more
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Journal of Rheology, 2013
This work presents a linear and nonlinear interfacial rheological characterization of viscoelastic protein adsorption layers formed by β-lactoglobulin fibrils, β-lactoglobulin peptides, and native β-lactoglobulin (called monomers) at the water–oil interface at pH 2.
Patrick A Ruhs +2 more
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This work presents a linear and nonlinear interfacial rheological characterization of viscoelastic protein adsorption layers formed by β-lactoglobulin fibrils, β-lactoglobulin peptides, and native β-lactoglobulin (called monomers) at the water–oil interface at pH 2.
Patrick A Ruhs +2 more
exaly +2 more sources