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Abstract:

We present results from molecular dynamics simulations performed on reverse micelles immersed in cyclohexane. Three different inner polar phases are considered: water (W), formamide (FM), and an equimolar mixture of the two solvents. In all cases, the surfactant was sodium bis(2-ethylhexyl) sulfosuccinate (usually known as AOT). The initial radii of the micelles were R∼15 Å, while the corresponding polar solvent-to-surfactant molar ratios were intermediate between w0 =4.3 for FM and w0 =7 for W. The resulting overall shapes of the micelles resemble distorted ellipsoids, with average eccentricities of the order of ∼0.75. Moreover, the pattern of the surfactant layer separating the inner pool from the non-polar phase looks highly irregular, with a roughness characterized by length scales comparable to the micelle radii. Solvent dipole orientation polarization along radial directions exhibit steady growths as one moves from central positions toward head group locations. Local density correlations within the micelles indicate preferential solvation of sodium ionic species by water, in contrast to the behavior found in bulk equimolar mixtures. Still, a sizable fraction of ∼90% of Na+ remains associated with the head groups. Compared to bulk results, the translational and rotational modes of the confined solvents exhibit important retardations, most notably those operated in rotational motions where the characteristic time scales may be up to 50 times larger. Modifications of the intramolecular connectivity expressed in terms of the average number of hydrogen bonds and their lifetimes are also discussed. © 2008 American Institute of Physics.

Registro:

Documento: Artículo
Título:Molecular dynamics simulations of AOT-water/formamide reverse micelles: Structural and dynamical properties
Autor:Pomata, M.H.H.; Laria, D.; Skaf, M.S.; Elola, M.D.
Filiación:Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429 Buenos Aires, Argentina
Departamento de Quimica Inorganica Analitica y Quimica-Fisica e INQUIMAe, Facultad de Ciencias Exactas y Naturales, Pabellón II, 1428 Buenos Aires, Argentina
Institute of Chemistry, State University of Campinas-UNICAMP, P.O. Box 6154, Campinas, São Paulo 13084-862, Brazil
Palabras clave:Amides; Colloids; Dynamics; Hydrogen; Hydrogen bonds; Ionization of liquids; Molecular dynamics; Quantum chemistry; Sodium; Solvents; Surface active agents; Average numbers; Characteristic times; Dipole orientations; Dynamical properties; Equimolar mixtures; Head groups; Ionic species; Length scales; Life-times; Local densities; Molar ratios; Molecular dynamics simulations; Polar phasis; Polar solvents; Preferential solvations; Radial directions; Reverse micelles; Rotational modes; Rotational motions; Sulfosuccinate; Surfactant layers; Micelles
Año:2008
Volumen:129
Número:24
DOI: http://dx.doi.org/10.1063/1.3042275
Título revista:Journal of Chemical Physics
Título revista abreviado:J Chem Phys
ISSN:00219606
CODEN:JCPSA
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00219606_v129_n24_p_Pomata.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219606_v129_n24_p_Pomata

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Citas:

---------- APA ----------
Pomata, M.H.H., Laria, D., Skaf, M.S. & Elola, M.D. (2008) . Molecular dynamics simulations of AOT-water/formamide reverse micelles: Structural and dynamical properties. Journal of Chemical Physics, 129(24).
http://dx.doi.org/10.1063/1.3042275
---------- CHICAGO ----------
Pomata, M.H.H., Laria, D., Skaf, M.S., Elola, M.D. "Molecular dynamics simulations of AOT-water/formamide reverse micelles: Structural and dynamical properties" . Journal of Chemical Physics 129, no. 24 (2008).
http://dx.doi.org/10.1063/1.3042275
---------- MLA ----------
Pomata, M.H.H., Laria, D., Skaf, M.S., Elola, M.D. "Molecular dynamics simulations of AOT-water/formamide reverse micelles: Structural and dynamical properties" . Journal of Chemical Physics, vol. 129, no. 24, 2008.
http://dx.doi.org/10.1063/1.3042275
---------- VANCOUVER ----------
Pomata, M.H.H., Laria, D., Skaf, M.S., Elola, M.D. Molecular dynamics simulations of AOT-water/formamide reverse micelles: Structural and dynamical properties. J Chem Phys. 2008;129(24).
http://dx.doi.org/10.1063/1.3042275