Shifting of transition temperature of ferroelectric liquid crystals due to addition of dye-An optical and dielectric study

Srivastava, Abhishek Kumar; Misra, Abhishek Kumar; Chand, P.B.; Manohar, Rajiv; Shukla, J. P.

doi:10.1016/j.jpcs.2007.01.010

Cited by 20 publications

(8 citation statements)

References 14 publications

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“…The observed relaxation peak in the plot is due to the Goldstone mode of relaxation. This mode is associated with the phase fluctuation of FLC molecules [8,9]. The first observation from the graph is the immense increment in the value of dielectric loss for the SWCNT doped FLC system as compared to that for the pure FLC system.…”

Section: Temperature Controlmentioning

confidence: 95%

“…Measurement in the high frequency range has been limited to 10 MHz because of the dominating effect of finite resistance of ITO coating on the glass plates of sample cell and lead inductance [8][9][10].…”

Section: Dielectric Permittivity Studymentioning

confidence: 99%

“…The dielectric and electro-optical properties of FLCs such as dielectric permittivity, spontaneous polarization, contrast ratio, switching characteristics make them an excellent material for display purpose. Doping of different dyes and nanoparticles in the FLC has been attempted for their better performance in display devices and other applications [8][9][10][11][12]. Recent work on dielectric studies on CNT doped FLC system has shown a great increase in the dielectric permittivity, loss and relaxation strength as compared to the pure FLC system [13].…”

Section: Introductionmentioning

confidence: 99%

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Modification in dielectric properties of SWCNT doped ferroelectric liquid crystals

Gupta

Kumar

Srivastava

et al. 2011

Journal of Non-Crystalline Solids

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Section: Temperature Controlmentioning

confidence: 95%

Section: Dielectric Permittivity Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modification in dielectric properties of SWCNT doped ferroelectric liquid crystals

Gupta

Kumar

Srivastava

et al. 2011

Journal of Non-Crystalline Solids

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“…In the present study, six equivalent cells were prepared, one of which was filled with pure FLC and the remainder filled with GHFLC mixtures. The complete method for sample cell preparation has been discussed in earlier papers [7][8][9][10][11][12][13][14].…”

Section: Cell Preparationmentioning

confidence: 99%

“…An understanding of the surface anchoring effect of FLCs is vital for the development of new applications and for the improvement of existing ones. If a small amount of dye is dissolved into a liquid crystal, the dye molecules align in the liquid crystal matrix [7][8][9][10][11][12] and hence can orient from one direction to another along with the liquid crystal molecules on the application of an electric field. The phenomenon of the alignment of dyes by liquid crystal molecules is called the guesthost interaction [3,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Surface anchoring effect on guest–host ferroelectric liquid crystal response time – an electro-optical investigation

Manohar

Pandey

Yadav

et al. 2010

Philosophical Magazine

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2010) Surface anchoring effect on guest-host ferroelectric liquid crystal response time -an electro-optical investigation, Philosophical Magazine, 90:34, 4529-4539,The effect is reported of surface anchoring on various electro-optical parameters of a pure ferroelectric liquid crystal (FLC) and five mixtures with different concentrations of dye. The Anthraquinone D5 dye was used as guest entity, whereas Felix 17-000 was used as host in this investigation. The presence of dye molecules in the FLC dramatically affects the electrooptical properties compared with those of the pure system. Electro-optical parameters such as spontaneous polarization and rotational viscosity not only change with the addition of dye but they are also strongly dependent on the concentration of dye in pure FLC. The effect of dye molecules on the anchoring energy of the pure FLC system was also investigated. Due to strong anchoring energy on FLC substrate, its effect on response time was also studied. An improvement in the contrast ratio after dye doping was observed. The value of spontaneous polarization increases due to addition of dye, suggesting that molecular alignment improves, which is very useful from the application point of view.

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Phase transition studies of polymer–liquid crystal composite using dielectric and optical transmittance techniques

et al. 2008

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Dielectric properties of polymer–liquid crystal composite comprised of the polymer poly(methyl methacrylate) and low‐molecular mass liquid crystal, cholesteryl palmitate are investigated in the frequency range from 1 kHz to 10 MHz and in the temperature range of 27–120°C. The dielectric permittivity and dielectric loss shows substantial changes with the addition of polymer. The significant feature is that the pure liquid crystal exhibits broad absorption, showing dielectric relaxation in the range of 10 – 100 kHz whereas the composite shows relaxation peaks at 10 MHz. The percentage optical transmittance of pure liquid crystal and composite have also been measured and compared to study its phase transition behavior. The smectic phase observed in the pure liquid crystal is suppressed on formation of polymer composites. The mass spectrometry measurement does not show any abduct formation between the pure liquid crystal and the composite. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers

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Shifting of transition temperature of ferroelectric liquid crystals due to addition of dye-An optical and dielectric study

Cited by 20 publications

References 14 publications

Modification in dielectric properties of SWCNT doped ferroelectric liquid crystals

Modification in dielectric properties of SWCNT doped ferroelectric liquid crystals

Surface anchoring effect on guest–host ferroelectric liquid crystal response time – an electro-optical investigation

Phase transition studies of polymer–liquid crystal composite using dielectric and optical transmittance techniques

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