7 Nonelectrolyte solutions exhibiting structure on the nanoscale

Ciach, A.; Góźdź, Wojciech T.

doi:10.1039/b101392k

Cited by 43 publications

(64 citation statements)

References 183 publications

(406 reference statements)

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“…A functional of the same form was successfully applied to amphiphilic systems [12,13]. Thus, our theoretical result and the experimental observations of similar- Table. I.…”

Section: Discussion and Summarysupporting

confidence: 55%

“…(30) we can easily obtain the approximate expression for the correlation function in the real-space representation [13],…”

Section: Comparison With Microemulsionsmentioning

confidence: 99%

“…For this purpose we first develop a Landau-type functional starting from a microscopic density functional theory and using the same coarse-graining procedure as used earlier for the hydrophilic salt [10,11]. In the next step we verify under what conditions the Brazovskii functional of the solvent concentration, developed earlier for amphiphilic systems [12,13,15] can be obtained.…”

Section: Introductionmentioning

confidence: 99%

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The effect of antagonistic salt on a confined near-critical mixture

Pousaneh

Ciach

2014

Soft Matter

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We consider a near-critical binary mixture with addition of antagonistic salt confined between weakly charged and selective surfaces. A mesoscopic functional for this system is developed from a microscopic description by a systematic coarse-graining procedure. The functional reduces to the Landau-Brazovskii functional for amphiphilic systems for sufficiently large ratio between the correlation length in the critical binary mixture and the screening length. Our theoretical result agrees with the experimental observation [Sadakane et.al. J. Chem. Phys. 139, 234905 (2013)] that the antagonistic salt and surfactant both lead to a similar mesoscopic structure. For very small salt concentration ρ ion the Casimir potential is the same as in a presence of inorganic salt.For larger ρ ion the Casimir potential takes a minimum followed by a maximum for separations of order of tens of nanometers, and exhibits an oscillatory decay very close to the critical point. For separations of tens of nanometers the potential between surfaces with a linear size of hundreds of nanometers can be of order of k B T . We have verified that in the experimentally studied samples [Sadakane et.al. J. Chem. Phys. 139, 234905 (2013), Leys et.al. Soft Matter 9, 9326 (2013] the decay length is too small compared to the period of oscillations of the Casimir potential, but the oscillatory force could be observed closer to the critical point.

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“…A functional of the same form was successfully applied to amphiphilic systems [12,13]. Thus, our theoretical result and the experimental observations of similar- Table. I.…”

Section: Discussion and Summarysupporting

confidence: 55%

“…(30) we can easily obtain the approximate expression for the correlation function in the real-space representation [13],…”

Section: Comparison With Microemulsionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of antagonistic salt on a confined near-critical mixture

Pousaneh

Ciach

2014

Soft Matter

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“…The last regime is the transition between the previous two, when the domain size is not well distinguished from size of the concentration fluctuations. In this regime, called the Lifshitz regime (Ciach and Godz, 2001), fluctuations form and destroy the domains. In a sense this is akin to a critical point, but where fluctuations can never diverge because domains stabilize their divergences.…”

Section: The Teubner-strey Theoretical Description Of Micro-emulsionsmentioning

confidence: 99%

Micro-Heterogeneity in Complex Liquids

Perera¹,

Kežić²,

Sokolić³

et al. 2012

Molecular Dynamics - Studies of Synthetic and Biological Macromolecules

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“…Explicit expressions for A 3 and A 4 are given in Appendix. The functional (25) has a well know structure [23][24][25][26] considered before in phenomenological approaches to block copolymers, highly charged colloids and microemulsions. We repeat the same procedure and assume that η(x) is periodic and can be written in the form…”

Section: First Order Transition To Microsegregated Phasesmentioning

confidence: 99%

Mesoscopic description of network-forming clusters of weakly charged colloids

Ciach¹,

Gozdz²

2010

Condens. Matter Phys.

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Systems composed of spherical charged particles in solvents containing counterions and inducing effective short-range attraction are studied in the framework of mesoscopic field-theory. We limit ourselves to meanfield approximation (MF) and to weak ordering. We discuss properties of potentials consisting of strong shortrange attraction and weak long-range repulsion (SALR) in the context of formation of nonuniform distribution of particles on a mesoscopic length scale instead of macroscopic phase separation. In earlier work it was found that spherical, cylindrical and slab-like clusters of particles are formed, and for low enough temperatures the clusters form ordered, periodic bcc, hexagonal and lamellar phases. In addition, a gyroid phase was predicted in which two interwoven regular network-like clusters branching in triple junctions are formed. At properly rescaled density and temperature, the coexistence lines between different ordered phases were found to be universal in MF, with the exception of the gyroid phase. Here the phase diagram is determined for two choices of the SALR potential, one corresponding to a large range of the attractive part of the potential, and the other one to a very small range of attraction. We find that the region of stability of the gyroid phase very weakly depends on the form of the SALR potential within the approximate theory.

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7 Nonelectrolyte solutions exhibiting structure on the nanoscale

Cited by 43 publications

References 183 publications

The effect of antagonistic salt on a confined near-critical mixture

The effect of antagonistic salt on a confined near-critical mixture

Micro-Heterogeneity in Complex Liquids

Mesoscopic description of network-forming clusters of weakly charged colloids

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