Publisher’s Note: Molecular orientation and the infrared dichroism of a chiral smectic liquid crystal in a homogeneously aligned cell at different temperature and bias fields [Phys. Rev. E<b>68</b>, 031707 (2003)]

Sigarev, A. A.; Vij, J. K.; Lewis, Robert A.; Hird, Michael; Goodby, J. W.

doi:10.1103/physreve.68.059902

Cited by 3 publications

(11 citation statements)

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“…A. Sigarev et al the observed differences in the IR absorption anisotropy of the phenyl and the carbonyl bands has confirmed unambiguously the existence of biasing in the rotational orientational distribution of the "chiral" carbonyl groups with respect to the molecular long axes in ferroelectric liquid crystals (FLCs) [2][3][4][5][7][8][9][10]. This effect of biasing is considered to be a cause of the origin of the spontaneous polarization in FLCs.…”

Section: /[394]mentioning

confidence: 65%

“…For each studied band of wavenumber v, we consider two equations that relate the expressions for the absorbances A Y , A Z , A YZ defined in Refs. [8,10] in terms of angles , β ν , γ ν and the dichroic ratios R Y,Z = A Y /A Z and R YZ,Z = A YZ /A Z with the numerical values of R Y,Z and R YZ,Z found using the fitted values max and R of the absorbance profile of this band. The respective equations for A Y , A Z , A YZ are given in [8,10].…”

Section: Figurementioning

confidence: 99%

“…max and R of the studied bands for the unwound SmC * structure (see Table 2) are used to determine the polar angles β and some biasing parameters of the orientational distributions through the azimuthal angle γ for the transition moments using the procedure reported in Refs. [8,10]. For each studied band of wavenumber v, we consider two equations that relate the expressions for the absorbances A Y , A Z , A YZ defined in Refs.…”

Section: Figurementioning

confidence: 99%

“…The planar homogeneously aligned cells with helical or field unwound structures of FLCs usually exhibit a comparatively high dichroism of the phenyl peak at a wavenumber ∼1600 cm −1 (the transition moments of the respective vibrations usually make polar angles less than 20 • with the molecular long axis) [1][2][3][4][5][7][8][9][10]. However, considerably lower dichroism is observed for the carbonyl bands in the spectral range 1700-1800 cm −1 and especially for the methylene bands observed in the range 2800-3000 cm −1 .…”

Section: /[394]mentioning

confidence: 99%

“…The molecular arrangements in anisotropic samples of chiral smectic liquid crystals (LCs) can be studied in detail using polarized Fourier-transform infrared (FTIR) spectroscopy since the absorbance profiles of characteristic absorption bands are sensitive to the orientational distributions of their vibrational transition moments [1][2][3][4][5][6][7][8][9][10]. An IR beam of rather low intensity usually used in FTIR spectrometers enables one to examine the molecular orientations in various smectic phases and to observe the structural transformations in LC samples caused by changes in temperature or external fields non-destructively.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Structure of a Partly Deuterated Chiral Smectic Liquid Crystal Studied by Polarized FTIR Spectroscopy

Sigarev¹,

Vij²,

Fukuda³

et al. 2004

Ferroelectrics

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The molecular structure of a partly deuterated chiral smectic liquid crystal 4- in a homogeneously aligned sample is studied using polarized Fourier-transform infrared (FTIR) spectroscopy. The relative orientations of the chiral and deuterated achiral alkyl chains of molecules with respect to their long axes and some properties of the orientational distributions of the carbonyl groups are quantitatively analysed for the ferroelectric SmC * phase with a field unwound structure. The analysis is carried out in terms of the absorption anisotropy of several bands related to stretching vibrations of the phenyl C 6 H 4 fragment, the deuterated biphenyl C 12 D 8 fragment, two carbonyl groups situated in different parts of a molecule, the methylene groups CH 2 and CD 2 . It has been found that the chiral and achiral alkyl chains make substantially different angles (∼60 • and ∼36 • , respectively) with the molecular long axis. The rotational orientational distribution of the carbonyl groups about the molecular long axes has been found to have a comparatively low polar biasing.Keywords Infrared spectra of a deuterated FLC compound; biasing in a FLC compound; IR dichroism; mobility of chains in a FLC compound

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Section: /[394]mentioning

confidence: 65%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: /[394]mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular Structure of a Partly Deuterated Chiral Smectic Liquid Crystal Studied by Polarized FTIR Spectroscopy

Sigarev¹,

Vij²,

Fukuda³

et al. 2004

Ferroelectrics

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Probing Molecular Binding Effect from Zinc Oxide Nanocrystal Doping in Surface-Stabilized Ferroelectric Liquid Crystal with Two-Dimensional Infrared Correlation Technique

Huang

Chen

2008

J. Phys. Chem. C

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Doping liquid crystal (LC) with nanomaterials has been shown to yield some degrees of freedom for tailoring LC properties. This approach can be employed to produce new LC materials with high application potentials by blending instead of synthesizing new mesogenic molecules. In this paper, we show that doping ferroelectric liquid crystal (FLC) with ZnO nanocrystals improves the alignment order of a surface-stabilized FLC (SSFLC) in both steady-state and field-induced reorientation processes. We used the two-dimensional infrared (2D IR) correlation technique to reveal that the ZnO nanocrystals were uniformly dispersed into the FLC medium. The homogeneous dispersion of ZnO nanodots produces stronger correlations among the IR-active molecular normal modes of FLC molecules, which then leads to more concerted reorientation process at the submolecular level. A molecular binding effect originating from a dipolar interaction of the ZnO nanodot with surrounding CO groups of FLC molecules was proposed to illustrate our measured results. We estimated the total energy reduced by the doping to be about 1000 J/m3. The alignment stability gained is similar to that experienced by FLC molecules within 100-nm distance to an alignment surface with a strong anchoring strength of 1 × 10-4 J·m-2.

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Preparation of Layered Polymer Networks by Cross-Linking Reaction of a Liquid Crystalline Polyphosphazene in a Smectic Phase

Lee

Chang

2009

Macromolecules

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Publisher’s Note: Molecular orientation and the infrared dichroism of a chiral smectic liquid crystal in a homogeneously aligned cell at different temperature and bias fields [Phys. Rev. E68, 031707 (2003)]

Cited by 3 publications

References 0 publications

Molecular Structure of a Partly Deuterated Chiral Smectic Liquid Crystal Studied by Polarized FTIR Spectroscopy

Molecular Structure of a Partly Deuterated Chiral Smectic Liquid Crystal Studied by Polarized FTIR Spectroscopy

Probing Molecular Binding Effect from Zinc Oxide Nanocrystal Doping in Surface-Stabilized Ferroelectric Liquid Crystal with Two-Dimensional Infrared Correlation Technique

Preparation of Layered Polymer Networks by Cross-Linking Reaction of a Liquid Crystalline Polyphosphazene in a Smectic Phase

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