D. K. Chattoraj and K. S. Birdi: Adsorption and the Gibbs Surface Excess. Plenum Press, New York and London 1984, 471 Seiten, Preis: $ 59.50.

1985 ◽  
Vol 89 (11) ◽  
pp. 1250-1250 ◽  
Author(s):  
G. H. Findenegg
Keyword(s):  
New York ◽  
Surface Excess ◽  
Gibbs Surface Excess

The gibbs surface excess in binary miscibility gap systems

1981 ◽  
Vol 80 (1) ◽  
pp. 197-207 ◽  
Author(s):  
Gary M Nishioka ◽  
Lewis L Lacy ◽  
Barbara R Facemire
Keyword(s):  
Miscibility Gap ◽  
Surface Excess ◽  
Gibbs Surface Excess

scholarly journals Experimental Investigations of Behaviour of Biosurfactants in Brine Solutions Relevant to Hydrocarbon Reservoirs

2019 ◽  
Vol 3 (1) ◽  
pp. 24 ◽  
Author(s):  
Tinuola Udoh ◽  
Jan Vinogradov
Keyword(s):  
Surface Tension ◽  
Free Energy ◽  
Oil Recovery ◽  
High Salinity ◽  
Standard Free Energy ◽  
Experimental Investigations ◽  
Surface Excess ◽  
Hydrocarbon Reservoir ◽  
Air Interface ◽  
Gibbs Surface Excess

In this study, we investigated the behaviour of rhamnolipid and Greenzyme in brine solutions relevant to hydrocarbon reservoir. Prior to this work, several studies only reported the behaviour of the biosurfactants dissolved in sodium chloride solutions of varied salinity. The results of this study are relevant to the application of the biosurfactants in enhanced oil recovery, during which the compounds are injected into reservoir saturated with formation water, typically of high salinity and complex composition. Surface tension and conductivity methods were used to determine the critical micelle concentrations of the biosurfactants, Gibbs surface excess concentrations and standard free energy at water-air interface. The results show that rhamnolipid and Greenzyme could reduce the surface tension of water from 72.1 ± 0.2 mN/m to 34.7 ± 0.4 mN/m and 47.1 ± 0.1 mN/m respectively. They were also found to be stable in high salinity and high temperature with rhamnolipid being sensitive to brine salinity, composition and pH while Greenzyme showed tolerance for high salinity. Furthermore, the Gibbs standard free energy of micellisation shows that rhamnolipid and Greenzyme have the tendency to spontaneously form micelles with rhamnolipid showing more surface adsorption. However from maximal Gibbs surface excess concentration calculations, Greenzyme monomers tend to favour aggregation more than that of rhamnolipid.

Motion of a particle generated by chemical gradients Part 1. Non-electrolytes

1982 ◽  
Vol 117 ◽  
pp. 107-121 ◽  
Author(s):  
J. L. Anderson ◽  
M. E. Lowell ◽  
D. C. Prieve
Keyword(s):  
Particle Surface ◽  
Particle Interaction ◽  
Physical Interaction ◽  
Surface Excess ◽  
Algebraic Form ◽  
Chemical Gradients ◽  
Scale Characteristic ◽  
Quantitative Understanding ◽  
Gibbs Surface Excess ◽  
Solute Particle

When a particle is placed in a fluid in which there is a non-uniform concentration of solute, it will move toward higher or lower concentration depending on whether the solute is attracted to or repelled from the particle surface. A quantitative understanding of this phenomenon requires that the equations representing conservation of mass and momentum within the fluid in the vicinity of the particle are solved. This is accomplished using a method of matched asymptotic expansions in a small parameter L/a, where a is the particle radius and L is the length scale characteristic of the physical interaction between solute and particle surface. This analysis yields an expression for particle velocity, valid in the limit L/a → 0, that agrees with the expression obtained by previous researchers. The result is cast into a more useful algebraic form by relating various integrals involving the solute/particle interaction energy to a measurable thermodynamic property, the Gibbs surface excess of solute Γ. An important result is that the correction for finite L/a is actually O(Γ/C∞a), where C∞ is the bulk concentration of solute, and could be O(1) even when L/a is orders of magnitude smaller.

Tensiometric determination of Gibbs surface excess and micelle point: A critical revisit

2013 ◽  
Vol 394 ◽  
pp. 329-336 ◽  
Author(s):  
Indrajyoti Mukherjee ◽  
Satya P. Moulik ◽  
Animesh K. Rakshit
Keyword(s):  
Surface Excess ◽  
Gibbs Surface Excess
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