• Corpus ID: 55695433

Microemulsion sponge phase as a manifestation of the superflexibility critical point of tensionless balanced liquid-liquid interfaces

@article{Varadharajan2018MicroemulsionSP,
  title={Microemulsion sponge phase as a manifestation of the superflexibility critical point of tensionless balanced liquid-liquid interfaces},
  author={Ramanathan Varadharajan and Frans A. M. Leermakers},
  journal={arXiv: Soft Condensed Matter},
  year={2018}
}
We have analyzed the mechanical properties of surfactant loaded tensionless balanced liquid/liquid interfaces using self-consistent field theory implementing a coarse grained model. Such a tensionless state, as occurring in microemulsions, signals a first-order interfacial phase transition. Consequently, the interfacial area is set by the amount of surfactant in the system. Near the bulk critical point, such systems suffer an interfacial, so-called superflexibility (SF) critical point as soon… 
1 Citations

Figures from this paper

Exploring Novel Biophysical Mechanisms in Evolved Optical Systems
TLDR
It is shown that zwitterionic betaines, long known to exist in millimolar concentrations in coral and clam hosts, generally accelerate photosynthate diffusion and that reflectin, known to self-assemble into dense, membrane bound platelets, strongly interacts with lipid bilayers and increases the propensity for the membrane to adopt the flat structures observed in cells.

References

SHOWING 1-10 OF 82 REFERENCES
Microemulsions and the flexibility of oil/water interfaces
The purpose of this review is to understand why a random structure of this type does not collapse into an ordered phase. The interface saturated by surfactant has a nearly vanishing surface tension;
Critical behavior in microemulsions
Abstract Interactions in dispersions have been studied using light scattering techniques applied to microemulsions. In these systems, hard sphere interactions are dominant. The remaining interactions
Sign Switch of Gaussian Bending Modulus for Microemulsions: A Self-Consistent Field Analysis Exploring Scale Invariant Curvature Energies.
TLDR
It is observed that κ[over ¯] tends to be negative for strong segregation and positive for weak segregation, a finding which is instrumental for understanding phase transitions from a lamellar to a spongelike microemulsion.
Transparent nematic phase in a liquid-crystal-based microemulsion
TLDR
This work replaces the oil component of a conventional water-in-oil microemulsion with an intrinsically anisotropic fluid—a nematic liquid crystal that is an ordered nematic at the mesoscopic level, but which does not exhibit the strong light scattering generally associated with bulk nematic order.
Phase behavior and interfacial curvature in water-oil-surfactant systems
  • R. Strey
  • Chemistry, Materials Science
  • 1996
The phase behavior of water-oil-surfactant systems follows general patterns. The driving force for the phase behavior has been identified as the variation of the mean curvature of the surfactant film
Statistical thermodynamics of phase equilibria in microemulsions
The statistical thermodynamics of microemulsions is investigated on the basis of a model which represents microemulsion structure as a random geometry of interspersed oil and water domains generated
Random surface model for the L3-phase of dilute surfactant solutions (Erratum)
We present a simple model for the anomalous (flow-birefringent) isotropic phase, known as L3, that is seen in certain surfactant solutions at volume fractions of a few percent. The proposed structure
Bicontinuous structure zones in microemulsions
Winsor IV systems1, or microemulsions2, are macroscopically monophasic fluid transparent compounds made up by mixing water and hydrocarbon in the presence of suitable surface active agents. Depending
Ginzburg-Landau theory of oil-water-surfactant mixtures.
  • Gompper, Zschocke
  • Physics, Medicine
    Physical review. A, Atomic, molecular, and optical physics
  • 1992
TLDR
The surface tension a, the spontaneous curvature modulus λ, the saddle-splay modulus k, and the bending rigidity k of the surfactant sheet at the oil-water interface can all be calculated from the order-parameter profile of the planar oil- water interface.
Bending rigidities of surfactant bilayers using self-consistent field theory.
  • F. Leermakers
  • Chemistry, Medicine
    The Journal of chemical physics
  • 2013
TLDR
Self-consistent field (SCF) theory is used to find bending moduli of surfactant and lipid bilayers and it is found that k[overline] can also become positive, and the value of kc is reduced and the Gaussian bending modulus is less negative and much closer to zero.
...
1
2
3
4
5
...