Characterization of the electric-field-induced orientation and relaxation dynamics of liquid crystals by time-resolved step-scan Fourier transform infrared spectroscopy

Shilov, S. V.; Okretic, Stefano; Siesler, Heinz W.

doi:10.1016/0924-2031(94)00043-g

Cited by 43 publications

(25 citation statements)

References 12 publications

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“…As shows already rich literature [1][2][3][4][5][6][7][8][9][10] the polarized IR spectra of liquid crystals (LCs) yield interesting information from the point of view of both the degree of ordering in mesophases and characteristics of particular vibrational modes. Moreover, in the case of liquid crystals there are possibilities to prepare oriented samples, and applying the polarized light, to measure the direction of the transition dipole moment [2].…”

Section: Introductionmentioning

confidence: 99%

Polarized IR spectra of resonance assisted hydrogen bond (RAHB) in 2-hydroxyazobenzenes

Роспенк¹,

Majewska²,

Czarnik-Matusewicz³

et al. 2006

Chemical Physics

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Section: Introductionmentioning

confidence: 99%

Polarized IR spectra of resonance assisted hydrogen bond (RAHB) in 2-hydroxyazobenzenes

Роспенк¹,

Majewska²,

Czarnik-Matusewicz³

et al. 2006

Chemical Physics

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“…In particular, TR-FTIR spectroscopy involving stable step-scan (16) interferometry (61,62) has been utilized to monitor dynamic phenomena in wide-ranging systems, including the dynamics of biological molecules, reaction and binding mechanisms, rheo-optics of polymeric materials, and laser emissions. The reorientation dynamics of liquid crystalline materials responding to externally applied electric fields also is an area of considerable activity (63)(64)(65)(66)(67)(68).…”

Section: Time-resolved Ftir Spectroscopic Imagingmentioning

confidence: 99%

FOURIER TRANSFORM INFRARED VIBRATIONAL SPECTROSCOPIC IMAGING: Integrating Microscopy and Molecular Recognition

Levin

Bhargava

2005

Annu. Rev. Phys. Chem.

273

203

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The recent development of Fourier transform infrared (FTIR) spectroscopic imaging has enhanced our capability to examine, on a microscopic scale, the spatial distribution of vibrational spectroscopic signatures of materials spanning the physical and biomedical disciplines. Recent activity in this emerging area has concentrated on instrumentation development, theoretical analyses to provide guidelines for imaging practice, novel data processing algorithms, and the introduction of the technique to new fields. To illustrate the impact and promise of this spectroscopic imaging methodology, we present fundamental principles of the technique in the context of FTIR spectroscopy and review new applications in various venues ranging from the physical chemistry of macromolecular systems to the detection of human disease.

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“…Examples of systems with this type of dynamic change are orientation and relaxation of low-and highmolecular-w eight liquid cr ystals under the in¯uence of an applied electric ® eld. 6,9,10 In general, the time-depen-dent spectral intensity during the relaxation phenomena is given by…”

Section: Theo Rymentioning

confidence: 99%

“…The system under investigation is the orientation and relaxation of the liquid cr ystal 5CB under the in¯uence of the applied electric ® eld. 9 The pre-aligned liquid crystal is perturbed by an applied electric ® eld (6 10 V dc at a switching frequency of 10 kHz) with an excitation period of 215 m s and relaxation period of 600 ms. The transmission spectra are collected to 8 cm 2 1 resolution with a Bruker IFS 28 FT-IR spectrometer equipped with an MCT detector.…”

Section: Theo Rymentioning

confidence: 99%

Dynamic Infrared Spectroscopy Using the Rapid-Scan Technique

1999

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A technique using rapid-scan Fourier transform infrared (FT-IR) spectroscopy to observe reversible dynamic changes of systems under an externally applied perturbation is introduced. The technique does not require a lock-in amplifier or synchronization between the applied perturbation and the spectral acquisition. With the use of a carefully designed sampling rate with respect to the perturbation period and reconstruction of the observed spectral intensities, dynamic spectral intensities of the system are obtained. Due to the repeated behavior, the reconstructed spectral intensities can be used to represent the dynamic characteristic of the system. The experimentation time of the rapid-scan technique is significantly shorter than that of the step-scan technique. The influences of noise and experimental parameters on the observed spectral intensities are verified. Applications of the technique to systems with sinusoidal dynamic changes and exponentially decaying dynamic changes are demonstrated.

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Characterization of the electric-field-induced orientation and relaxation dynamics of liquid crystals by time-resolved step-scan Fourier transform infrared spectroscopy

Cited by 43 publications

References 12 publications

Polarized IR spectra of resonance assisted hydrogen bond (RAHB) in 2-hydroxyazobenzenes

Polarized IR spectra of resonance assisted hydrogen bond (RAHB) in 2-hydroxyazobenzenes

FOURIER TRANSFORM INFRARED VIBRATIONAL SPECTROSCOPIC IMAGING: Integrating Microscopy and Molecular Recognition

Dynamic Infrared Spectroscopy Using the Rapid-Scan Technique

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