Osmotic pressure of foams and highly concentrated emulsions. 2. Determination from the variation in volume fraction with height in an equilibrated column

Langmuir ◽  
1987 ◽  
Vol 3 (1) ◽  
pp. 36-41 ◽  
Author(s):  
H. M. Princen ◽  
A. D. Kiss
Keyword(s):  
Osmotic Pressure ◽  
Volume Fraction ◽  
Concentrated Emulsions

Osmotic pressure and viscoelastic shear moduli of concentrated emulsions

1997 ◽  
Vol 56 (3) ◽  
pp. 3150-3166 ◽  
Author(s):  
T. Mason ◽  
Martin-D. Lacasse ◽  
Gary Grest ◽  
Dov Levine ◽  
J. Bibette ◽  
...  
Keyword(s):  
Osmotic Pressure ◽  
Shear Moduli ◽  
Concentrated Emulsions

Influence of Cluster Formation: Viscosity of Concentrated Emulsions

2003 ◽  
Vol 13 (5) ◽  
pp. 259-264 ◽  
Author(s):  
G. Kyazze ◽  
V. Starov
Keyword(s):  
Experimental Data ◽  
Shear Rate ◽  
Volume Fraction ◽  
Cluster Formation ◽  
Relative Viscosity ◽  
Skim Milk ◽  
Colloid Interface ◽  
Rate Range ◽  
Concentrated Emulsions ◽  
Fraction Comparison

Abstract Recently a new theory of viscosity of concentrated emulsions dependency on volume fraction of droplets (Starov V, Zhdanov G: J. Colloid Interface Sci, 258, 404 (2003)) has been suggested that relates the viscosity of concentrated emulsions to formation of clusters. Through experiments with milk at different concentrations of fat, cluster formation has been validated using optical microscopy and their properties determined using the mentioned theory. Viscometric studies have shown that within the shear rate range studied, both the packing density of fat droplets inside clusters and the relative viscosity of milk (viscosity over skim milk viscosity) are independent of shear-rate, but vary with volume fraction. Comparison of the experimental data with previous theories that assumed that the particles remained discrete shows wide variation. We attribute the discrepancy to cluster formation.

scholarly journals Microfluidics: A Novel Approach for Dehydration Protein Droplets

Biosensors ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 460
Author(s):  
Van Nhat Pham ◽  
Dimitri Radajewski ◽  
Isaac Rodríguez-Ruiz ◽  
Sebastien Teychene
Keyword(s):  
Equation Of State ◽  
Osmotic Pressure ◽  
Volume Fraction ◽  
Water Saturation ◽  
Colloidal Suspension ◽  
Membrane System ◽  
Continuous Phase ◽  
Permeable Membrane ◽  
Operation Conditions ◽  
Novel Approach

The equation of state of colloids plays an important role in the modelling and comprehension of industrial processes, defining the working conditions of processes such as drying, filtration, and mixing. The determination of the equation is based on the solvent equilibration, by dialysis, between the colloidal suspension and a reservoir with a known osmotic pressure. In this paper, we propose a novel microfluidic approach to determine the equation of state of a lysozyme solution. Monodispersed droplets of lysozyme were generated in the bulk of a continuous 1-decanol phase using a flow-focusing microfluidic geometry. In this multiphasic system and in the working operation conditions, the droplets can be considered to act as a permeable membrane system. A water mass transfer flow occurs by molecule continuous diffusion in the surrounding 1-decanol phase until a thermodynamic equilibrium is reached in a few seconds to minutes, in contrast with the standard osmotic pressure measurements. By changing the water saturation of the continuous phase, the equation of state of lysozyme in solution was determined through the relation of the osmotic pressure between protein molecules and the volume fraction of protein inside the droplets. The obtained equation shows good agreement with other standard approaches reported in the literature.

Chemically Driven Deformation of Polymers

1989 ◽  
Vol 111 (1) ◽  
pp. 68-73 ◽  
Author(s):  
C.-Y. Hui ◽  
K.-C. Wu ◽  
Ronald C. Lasky ◽  
Edward J. Kramer
Keyword(s):  
Small Molecules ◽  
Osmotic Pressure ◽  
Printed Circuit Boards ◽  
Volume Fraction ◽  
Polymer Chains ◽  
Circuit Boards ◽  
Diffusion Front ◽  
Polymer Glasses ◽  
Printed Circuit ◽  
Good Agreement

Chemically driven deformation of polymer glasses is important in a variety of electronic packaging applications ranging from stripping of photoresists to diffusion of processing liquids into printed circuit boards. The swelling of such glasses by small molecules requires the deformation of polymer chains, a deformation that can be modelled as driven by an osmotic pressure. Equations governing the rate of this process are developed and the predictions are compared with the results of experiments in which the volume fraction φ of iodohexane (IOH) sorbed at the surface of polystyrene is measured as a function of exposure time. Once a critical φ is reached, a diffusion front develops and moves into the polymer at a constant velocity. The velocity V of this front can be predicted quantitatively from V=D(φm)a′(φm)a(φm)∂φ∂tφm where D is the diffusion coefficient of the IOH in the glass, a, and a′ are the activity of IOH and its derivative with respect to φ and the subscript m signifies that the quantities are evaluated at the volume fraction of the maximum osmotic pressure ahead of the front. The φ(t) and V predicted by a pressure dependent viscous swelling model for ∂φ/∂t are in good agreement with the experimental results at low IOH activities.

Liquid dispersions under gravity: volume fraction profile and osmotic pressure

Soft Matter ◽  
2013 ◽  
Vol 9 (8) ◽  
pp. 2531 ◽  
Author(s):  
Armando Maestro ◽  
Wiebke Drenckhan ◽  
Emmanuelle Rio ◽  
Reinhard Höhler
Keyword(s):  
Osmotic Pressure ◽  
Volume Fraction

CROSSOVER FROM SEMIDILUTE TO CONCENTRATED POLYMER SOLUTIONS: FINITE VOLUME FRACTION EFFECTS

1990 ◽  
Vol 04 (22) ◽  
pp. 1421-1428 ◽  
Author(s):  
YASUHIRO SHIWA ◽  
YOSHITSUGU OONO ◽  
PHILIP R. BALDWIN
Keyword(s):  
Osmotic Pressure ◽  
Finite Volume ◽  
Polymer Solutions ◽  
Volume Fraction ◽  
Monomer Concentration ◽  
Experimental Result ◽  
Universal Behavior

Effects of a finite volume fraction of polymer on the osmotic pressure of moderately concentrated polymer solutions are investigated. The predicted deviation from the universal behavior as the monomer concentration increases closely accounts for the experimental result.

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