scholarly journals Free Energies of Macroionic Suspensions and the Equation of State for Osmotic Pressure

2005 ◽  
Vol 113 (2) ◽  
pp. 235-250 ◽  
Author(s):  
I. S. Sogami ◽  
M. V. Smalley ◽  
T. Shinohara
Keyword(s):  
Equation Of State ◽  
Osmotic Pressure ◽  
Free Energies

scholarly journals Universal Equation of State Describes Osmotic Pressure throughout Gelation Process

2020 ◽  
Vol 125 (26) ◽  
Author(s):  
Takashi Yasuda ◽  
Naoyuki Sakumichi ◽  
Ung-il Chung ◽  
Takamasa Sakai
Keyword(s):  
Equation Of State ◽  
Osmotic Pressure ◽  
Universal Equation ◽  
Gelation Process

Equation of State and Structure of Electrostatic Colloidal Crystals: Osmotic Pressure and Scattering Study

1997 ◽  
Vol 7 (4) ◽  
pp. 603-626 ◽  
Author(s):  
V. Reus ◽  
L. Belloni ◽  
T. Zemb ◽  
N. Lutterbach ◽  
H. Versmold
Keyword(s):  
Equation Of State ◽  
Osmotic Pressure ◽  
Colloidal Crystals ◽  
Scattering Study

The adsorption of lower trialkylphosphates at the dodecane – water interface

1980 ◽  
Vol 58 (24) ◽  
pp. 2789-2795 ◽  
Author(s):  
Norman H. Sagert ◽  
Woon Lee
Keyword(s):  
Equation Of State ◽  
Chain Length ◽  
Water Interface ◽  
Two Dimensional ◽  
Free Energies ◽  
Dimensional Solution ◽  
Interfacial Tensions ◽  
Enthalpy Of Adsorption ◽  
Solution Models ◽  
Methylene Group

The adsorption of tripropylphosphate, triethylphosphate, and trimethylphosphate at the dodecane–water interface has been studied at temperatures from 293 to 313 K. Standard free energies of adsorption were obtained from the lowering of interfacial tensions in the low (< 10−4) solute mole fraction region. Standard enthalpies and entropies of adsorption were then obtained from the temperature variation of the standard free energies of adsorption.Standard free energies of adsorption from dodecane showed little variation with solute chain length, with the exception of trimethylphosphate. On the other hand, free energies of adsorption from water decreased by 3.45 kJ/mol for each methylene group added, again with the exception of trimethylphosphate. Enthalpies of adsorption increased linearly with increasing solute chain length for adsorption from either phase. For each methylene group added, the enthalpy of adsorption from dodecane increased by 2.9 kJ/mol, while that from water increased by 2.4 kJ/mol.Results for tripropylphosphate adsorption and for triethylphosphate adsorption at higher temperatures could be adequately described by the Schofield–Rideal equation of state, but not by simple two-dimensional solution models. Results for trimethylphosphate adsorption and for triethylphosphate adsorption at lower temperatures could not be fitted adequately by either type of equation of state.

Reply to "On the existence of an equation of state for interfacial free energies"

Langmuir ◽  
1990 ◽  
Vol 6 (4) ◽  
pp. 888-892 ◽  
Author(s):  
J. Gaydos ◽  
E. Moy ◽  
A. W. Neumann
Keyword(s):  
Equation Of State ◽  
Free Energies ◽  
Interfacial Free Energies

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.

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