dor_id: 4107939

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856.4.0.u: https://rmf.smf.mx/ojs/rmf/article/view/4104/4071

100.1.#.a: García Vázquez, P.; Morales Saavedra, O. G.; Carreón Castro, M. D. P.; Pelzl, G.

524.#.#.a: García Vázquez, P., et al. (2014). Preparation, structural and NLO-optical characterization of LB-molecular films from asymmetric Bent-Core liquid crystals. Revista Mexicana de Física; Vol 60, No 5 Sept-Oct: 390-0. Recuperado de https://repositorio.unam.mx/contenidos/4107939

245.1.0.a: Preparation, structural and NLO-optical characterization of LB-molecular films from asymmetric Bent-Core liquid crystals

502.#.#.c: Universidad Nacional Autónoma de México

561.1.#.a: Facultad de Ciencias, UNAM

264.#.0.c: 2014

264.#.1.c: 2014-01-01

653.#.#.a: Langmuir-Blodgett films; non linear optics; liquid crystals; Bent-Core mesogens

506.1.#.a: La titularidad de los derechos patrimoniales de esta obra pertenece a las instituciones editoras. Su uso se rige por una licencia Creative Commons BY-NC-ND 4.0 Internacional, https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.es, fecha de asignación de la licencia 2014-01-01, para un uso diferente consultar al responsable jurídico del repositorio por medio de rmf@ciencias.unam.mx

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041.#.7.h: eng

520.3.#.a: Molecular mono- and multilayered films of a polar asymmetric bent-core (``banana-shaped'') liquid crystalline (LC) compound with hydrocarbon end-chains were prepared by the Langmuir-Blodgett (LB) technique. Langmuir films were characterized by surface pressure isotherms and Brewster angle microscopy (BAM). Likewise, LB-films deposited onto glass substrates were characterized by UV-VIS spectroscopy, the optical second harmonic generation (SHG) technique and atomic force microscopy (AFM). Results show that the asymmetric structure of bent-core liquid crystals may promotes an unstable multi-layered (n > 10 LB-layers) LB-architecture which leads to a rapid collapse of Z-type arrangements, giving rise to a drastic decrease of the nonlinear optical (NLO) properties and film quality. Indeed, measurements evidence a tolerable and uniform molecular coverage on the glass substrates with anisotropic orientational distribution for a moderate number of layers only (n \leq 10 LB-layers); where, according to NLO-experimental data, the net molecular polarization is aligned outward the substrate layer. This observation leads us to implement a simplified model based on the monomeric rod-like approximation, in order to estimate significant NLO-tensorial components and an effective molecular hyperpolarizability \β \textrm eff -coefficient along the polar axes of the 2D-polar LC-compound within the mechanical stable LB-monolayer arrangements.

773.1.#.t: Revista Mexicana de Física; Vol 60, No 5 Sept-Oct (2014): 390-0

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handle: 03b6f47f533459c0

harvesting_date: 2020-09-23 00:00:00.0

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last_modified: 2020-11-27 00:00:00

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Artículo

Preparation, structural and NLO-optical characterization of LB-molecular films from asymmetric Bent-Core liquid crystals

García Vázquez, P.; Morales Saavedra, O. G.; Carreón Castro, M. D. P.; Pelzl, G.

Facultad de Ciencias, UNAM, publicado en Revista Mexicana de Física, y cosechado de Revistas UNAM

Licencia de uso

Procedencia del contenido

Entidad o dependencia
Facultad de Ciencias, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

Cita

García Vázquez, P., et al. (2014). Preparation, structural and NLO-optical characterization of LB-molecular films from asymmetric Bent-Core liquid crystals. Revista Mexicana de Física; Vol 60, No 5 Sept-Oct: 390-0. Recuperado de https://repositorio.unam.mx/contenidos/4107939

Descripción del recurso

Autor(es)
García Vázquez, P.; Morales Saavedra, O. G.; Carreón Castro, M. D. P.; Pelzl, G.
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
Preparation, structural and NLO-optical characterization of LB-molecular films from asymmetric Bent-Core liquid crystals
Fecha
2014-01-01
Resumen
Molecular mono- and multilayered films of a polar asymmetric bent-core (``banana-shaped'') liquid crystalline (LC) compound with hydrocarbon end-chains were prepared by the Langmuir-Blodgett (LB) technique. Langmuir films were characterized by surface pressure isotherms and Brewster angle microscopy (BAM). Likewise, LB-films deposited onto glass substrates were characterized by UV-VIS spectroscopy, the optical second harmonic generation (SHG) technique and atomic force microscopy (AFM). Results show that the asymmetric structure of bent-core liquid crystals may promotes an unstable multi-layered (n > 10 LB-layers) LB-architecture which leads to a rapid collapse of Z-type arrangements, giving rise to a drastic decrease of the nonlinear optical (NLO) properties and film quality. Indeed, measurements evidence a tolerable and uniform molecular coverage on the glass substrates with anisotropic orientational distribution for a moderate number of layers only (n \leq 10 LB-layers); where, according to NLO-experimental data, the net molecular polarization is aligned outward the substrate layer. This observation leads us to implement a simplified model based on the monomeric rod-like approximation, in order to estimate significant NLO-tensorial components and an effective molecular hyperpolarizability \β \textrm eff -coefficient along the polar axes of the 2D-polar LC-compound within the mechanical stable LB-monolayer arrangements.
Tema
Langmuir-Blodgett films; non linear optics; liquid crystals; Bent-Core mesogens
Idioma
eng
ISSN
2683-2224 (digital); 0035-001X (impresa)

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