Analytical model of flow dichroism in Langmuir-Blodgett films

Minari, Naoto; Ikegami, Keiichi; Kuroda, Shin–ichi; Saito, Kazuhiro; Saito, Mitsuyoshi; Sugi, Michio

doi:10.1016/0038-1098(88)90071-3

Cited by 60 publications

(19 citation statements)

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“…It has been proposed that the molecular reorientation occurring during the LB deposition is due to convection flows induced in the monolayer by the transfer. [11][12][13][14] Infrared spectroscopy is a particularly useful technique to study the molecular orientation in ultrathin films because it can provide information about films either on solid substrates or at the air/water interface. Several approaches have been developed to calculate the molecular orientation in ultrathin films from their infrared spectra.…”

Section: Introductionmentioning

confidence: 99%

Determination of Molecular Orientation in Biaxially Oriented Ultrathin Films

et al. 2004

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Biaxial orientation in ultrathin films is characterized by a preferential orientation of the main molecular axis in the plane of the film in addition to its orientation with respect to the normal of the film. In this paper, analytical expressions allowing the calculation of the molecular orientation in biaxially oriented films from their anisotropic optical constants are presented for the first time. These expressions have been used to calculate the molecular orientation in multilayers of poly(γ-benzyl-L-glutamate) and to determine the angles between the main molecular axis and the different transition moments used (R angles). Using the optical constants determined by Buffeteau et al.1 for PBG multilayers, we have found that the tilt angle of the PBG helices with respect to the monolayer normal is 89°and that the azimuthal angle in the plane is 57°. The calculated R angles for the carbonyl stretching mode of the ester group and the amide I and amide II modes of the amide group are 49, 34 and 74°, respectively. The analytical expressions presented in this paper have also been used to calculate the molecular orientation in Langmuir-Blodgett monolayers of an equimolar blend of poly(D-lactide) and poly(L-lactide). The optical constants of a monolayer of the polylactide mixture determined using p-and s-polarized transmittance and p-polarized reflection-absorption infrared spectra have shown that the polylactide helices have a tilt angle of 81°and an azimuthal angle of 56°.

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Section: Introductionmentioning

confidence: 99%

Determination of Molecular Orientation in Biaxially Oriented Ultrathin Films

et al. 2004

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“…23 Here, B is determined by the condition f (ϩ)ϭ f () related to the symmetry (2m) of the dumbbells.…”

Section: ͑8͒mentioning

confidence: 99%

Shear-induced optical anisotropy in a Langmuir monolayer: A Brewster angle reflectivity study

Cuvillier

Mingotaud

Ikegami³

1999

The Journal of Chemical Physics

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Articles you may be interested inApplication of Brewster angle microscopy and fractal analysis in investigations of compressibility of Langmuir monolayers J. Chem. Phys. 134, 024701 (2011); 10.1063/1.3522646Study of phase transition of two-dimensional ferroelectric copolymer P(VDF-TrFE) Langmuir monolayer by Maxwell displacement current and Brewster angle microscopy Transition between two next-nearest-neighbor phases in a mixed Langmuir monolayer. A study by grazingincidence x-ray diffraction and Brewster-angle microscopy Design and performance of an integrated fluorescence, polarized fluorescence, and Brewster angle microscope/Langmuir trough assembly for the study of lung surfactant monolayers Rev.Shearing an initially isotropic Langmuir film by a rotating disk can lead to an optical anisotropy at the interface. This induced anisotropy is related to a local in-plane molecular alignment due to the shearing and was experimentally observed using a monolayer based on a liquid crystal polyacrylate. The variation of the anisotropy versus shearing was modelized and measured by Brewster angle microscopy. The results reveal that the optical property of such a monolayer is similar to that of a two dimensional nematic liquid crystal.

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“…Many models have been proposed for the flow orientation during the monolayer transfer at the air-water interface [10][11][12]. In this paper, the in-plane anisotropy in Y-type interleaving multilayers of a hemicyanine dye and inert material arachidic acid was measured by optical linear (polarized UV-visible absorption) and nonlinear (rotation-angle second harmonic generation) techniques.…”

Section: Introductionmentioning

confidence: 99%