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Abstract:

Molecular dynamics simulations have been carried out to investigate the structure and dynamics of liquid methanol confined in 3.3 nm diameter cylindrical silica pores. Three cavities differing in the characteristics of the functional groups at their walls have been examined: (i) smooth hydrophobic pores in which dispersive forces prevail, (ii) hydrophilic cavities with surfaces covered by polar silanol groups, and (iii) a much more rugged pore in which 60% of the previous interfacial hydroxyl groups were replaced by the bulkier trimethylsilyl ones. Confinement promotes a considerable structure at the vicinity of the pore walls which is enhanced in the case of hydroxylated surfaces. Moreover, in the presence of the trimethylsilyl groups, the propagation of this interface-induced spatial ordering extends down to the central region of the pore. Concerning the dynamical modes, we observed an overall slowdown in both the translational and rotational motions. An analysis of these mobilities from a local perspective shows that the largest retardations operate at the vicinity of the interfaces. The gross features of the rotational dynamics were analyzed in terms of contributions arising from bulk and surface states. Compared to the bulk dynamical behavior, the characteristic timescales associated with the rotational motions show the most dramatic increments. A dynamical analysis of hydrogen bond formation and breaking processes is also included. © 2010 American Institute of Physics.

Registro:

Documento: Artículo
Título:Structure and dynamics of liquid methanol confined within functionalized silica nanopores
Autor:Elola, M.D.; Rodriguez, J.; Laria, D.
Filiación:Departamento de Física, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429 Buenos Aires, Argentina
ECyT, UNSAM, Martín de Irigoyen 3100, 1650 San Martín, Provincia de Buenos Aires, Argentina
Departamento de Quimica Inorganica Analitica y Quimica-Fisica e INQUIMAe, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Palabras clave:Breaking process; Dispersive forces; Dynamical analysis; Dynamical behaviors; Functionalized silica; Hydrogen-bond formation; Hydrophobic pore; Hydroxyl groups; Hydroxylated surfaces; Liquid methanol; Local perspective; Molecular dynamics simulations; Pore wall; Rotational dynamics; Rotational motion; Silanol groups; Silica pores; Spatial ordering; Structure and dynamics; Surface state; Time-scales; Trimethylsilyl; Trimethylsilyl groups; Dynamics; Functional groups; Hydrogen; Hydrogen bonds; Liquids; Methanol; Molecular dynamics; Rotational flow; Silica; Nanopores
Año:2010
Volumen:133
Número:15
DOI: http://dx.doi.org/10.1063/1.3503886
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_v133_n15_p_Elola.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219606_v133_n15_p_Elola

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Citas:

---------- APA ----------
Elola, M.D., Rodriguez, J. & Laria, D. (2010) . Structure and dynamics of liquid methanol confined within functionalized silica nanopores. Journal of Chemical Physics, 133(15).
http://dx.doi.org/10.1063/1.3503886
---------- CHICAGO ----------
Elola, M.D., Rodriguez, J., Laria, D. "Structure and dynamics of liquid methanol confined within functionalized silica nanopores" . Journal of Chemical Physics 133, no. 15 (2010).
http://dx.doi.org/10.1063/1.3503886
---------- MLA ----------
Elola, M.D., Rodriguez, J., Laria, D. "Structure and dynamics of liquid methanol confined within functionalized silica nanopores" . Journal of Chemical Physics, vol. 133, no. 15, 2010.
http://dx.doi.org/10.1063/1.3503886
---------- VANCOUVER ----------
Elola, M.D., Rodriguez, J., Laria, D. Structure and dynamics of liquid methanol confined within functionalized silica nanopores. J Chem Phys. 2010;133(15).
http://dx.doi.org/10.1063/1.3503886