Capillary phenomena. Part 5.—Equilibrium and stability of solid cones in fluid/fluid interfaces

1977 ◽  
Vol 73 (0) ◽  
pp. 1882 ◽  
Author(s):  
Ernest A. Boucher ◽  
Henry J. Kent
Keyword(s):  
Fluid Interfaces ◽  
Capillary Phenomena ◽  
Solid Cones

Liquid Materials and Flow Processes in Reduced Gravity

1981 ◽  
Vol 9 ◽  
Author(s):  
L. E. Scriven
Keyword(s):  
Viscous Flow ◽  
Convective Transport ◽  
Fluid Interfaces ◽  
Research Needs ◽  
Reduced Gravity ◽  
Effective Gravity ◽  
Capillary Phenomena ◽  
Flow Processes

ABSTRACTFluid states are central to melt and vapor processing. Fluids flow. As they do they convect heat, solutes, and inclusions. Liquid/gas interfaces have tension. Their importance rises when scale is small or effective gravity low.The forces that move fluids and mold fluid interfaces are recounted here. Fundamentals of viscous flow, convective transport, and capillary phenomena are summarized with special attention to the roles of gravity in liquid processing. Research needs are highlighted.

scholarly journals Surfactant Adsorption to Different Fluid Interfaces

Langmuir ◽  
2021 ◽  
Author(s):  
Jotam Bergfreund ◽  
Sarina Siegenthaler ◽  
Viviane Lutz-Bueno ◽  
Pascal Bertsch ◽  
Peter Fischer
Keyword(s):  
Fluid Interfaces ◽  
Surfactant Adsorption

scholarly journals Proteins from microalgae for the stabilization of fluid interfaces, emulsions, and foams

2021 ◽  
Vol 108 ◽  
pp. 326-342
Author(s):  
Pascal Bertsch ◽  
Lukas Böcker ◽  
Alexander Mathys ◽  
Peter Fischer
Keyword(s):  
Fluid Interfaces

scholarly journals β-Lactoglobulin Adsorption Layers at the Water/Air Surface: 5. Adsorption Isotherm and Equation of State Revisited, Impact of pH

2021 ◽  
Vol 5 (1) ◽  
pp. 14
Author(s):  
Georgi G. Gochev ◽  
Volodymyr I. Kovalchuk ◽  
Eugene V. Aksenenko ◽  
Valentin B. Fainerman ◽  
Reinhard Miller
Keyword(s):  
Theoretical Description ◽  
Fluid Interfaces ◽  
Interfacial Behavior ◽  
Current State ◽  
Air Interface ◽  
Direct Measurements ◽  
Wide Range ◽  
Dilational Viscoelasticity ◽  
Parameter Values ◽  
Β Lactoglobulin

The theoretical description of the adsorption of proteins at liquid/fluid interfaces suffers from the inapplicability of classical formalisms, which soundly calls for the development of more complicated adsorption models. A Frumkin-type thermodynamic 2-d solution model that accounts for nonidealities of interface enthalpy and entropy was proposed about two decades ago and has been continuously developed in the course of comparisons with experimental data. In a previous paper we investigated the adsorption of the globular protein β-lactoglobulin at the water/air interface and used such a model to analyze the experimental isotherms of the surface pressure, Π(c), and the frequency-, f-, dependent surface dilational viscoelasticity modulus, E(c)f, in a wide range of protein concentrations, c, and at pH 7. However, the best fit between theory and experiment proposed in that paper appeared incompatible with new data on the surface excess, Γ, obtained from direct measurements with neutron reflectometry. Therefore, in this work, the same model is simultaneously applied to a larger set of experimental dependences, e.g., Π(c), Γ(c), E(Π)f, etc., with E-values measured strictly in the linear viscoelasticity regime. Despite this ambitious complication, a best global fit was elaborated using a single set of parameter values, which well describes all experimental dependencies, thus corroborating the validity of the chosen thermodynamic model. Furthermore, we applied the model in the same manner to experimental results obtained at pH 3 and pH 5 in order to explain the well-pronounced effect of pH on the interfacial behavior of β-lactoglobulin. The results revealed that the propensity of β-lactoglobulin globules to unfold upon adsorption and stretch at the interface decreases in the order pH 3 > pH 7 > pH 5, i.e., with decreasing protein net charge. Finally, we discuss advantages and limitations in the current state of the model.

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