Tuning of birefringence, response time, and dielectric anisotropy by the dispersion of fluorescent dye into the nematic liquid crystal

Pathak, Govind; Agrahari, Kaushlendra; Yadav, Geeta; Srivastava, Atul; Strzeżysz, Olga; Manohar, Rajiv

doi:10.1007/s00339-018-1878-9

Cited by 31 publications

(8 citation statements)

References 31 publications

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“…Two basic approaches have been adopted in order to modify these properties. One is to synthesize the new LC material according to required parameters and the other one is to alter the basic properties of LC materials by doping it with different nanomaterials like dye [9,10], metallic NP [11,12], semiconducting NP [13,14], carbon nanotube [15] and some others [16][17][18]. Doping nanomaterials in the LCs to optimize the properties is potentially cost-effective, non-complicated and do not require great deal of efforts in comparison with synthesizing new one.…”

Section: Introductionmentioning

confidence: 99%

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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In the present investigation, TiO 2 -doped weakly polar nematic liquid crystal (NLC) has been studied. This study mainly focuses on dielectric, electro-optical and optical properties of pure NLC and doped systems. Variation in different parameters like dielectric permittivity, dielectric loss, dielectric anisotropy and conductivity has been noticed. Permittivity of the doped system is almost the same as undoped system. With doping concentration, the ionic contribution to the dielectric loss as observed in low-frequency region has been suppressed and the shift in relaxation frequency toward higher frequency side has also been observed. The electrical conductivity and threshold voltage have been decreased with increasing concentration of nanoparticles (NPs). The continuous increase in dielectric anisotropy with increasing the concentration of NPs has also been observed. These results have been attributed to the trapping capability of free ions by TiO 2 NPs. Further, we focused on the study of photoluminescence (PL), UV absorbance and Fourier transformed infrared spectroscopy (FTIR) of pure and doped systems. The continuous increase in PL intensity without any shift in emission peak has been observed for doped systems. Enhancement in UV absorbance with increasing concentration of NPs has also been observed. The effect of NPs doping on molecular dynamics of NLC can be clearly seen by FTIR study. The results suggest that the TiO 2 NP-doped weakly polar NLC can have significant improved dielectric, electro-optical and optical properties. This makes the weakly polar NLC to be a potential candidate for many applications.

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Section: Introductionmentioning

confidence: 99%

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

et al. 2018

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“…In fact, the mounting-induced reconfigurations were mainly observed in 8CB droplets. Due to the fast structural relaxation (a few milliseconds) of 5CB LC, no permanent structural changes were noted in 5CB droplets over the mounting process . We utilized an Olympus BX51 optical microscope equipped with crossed polarizers to track the defect configuration of the 5CB and 8CB droplets upon deformation of the PDLC film.…”

Section: Methodsmentioning

confidence: 99%

“…Due to the fast structural relaxation (a few milliseconds) of 5CB LC, no permanent structural changes were noted in 5CB droplets over the mounting process. 49 We utilized an Olympus BX51 optical microscope equipped with crossed polarizers to track the defect configuration of the 5CB and 8CB droplets upon deformation of the PDLC film. Isolated droplets were selected to avoid interference of transmitted wavelengths of the surroundings in the crossed-polarized images and accurately determine the structural evolution.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Director Distortion and Phase Modulation in Deformable Nematic and Smectic Liquid Crystal Spheroids

et al. 2022

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The growing interest in integrating liquid crystals (LCs) into flexible and miniaturized technologies brings about the need to understand the interplay between spatially curved geometry, surface anchoring, and the order associated with these materials. Here, we integrate experimental methods and computational simulations to explore the competition between surface-induced orientation and the effects of deformable curved boundaries in uniaxially and biaxially stretched nematic and smectic microdroplets. We find that the director field of the nematic LCs upon uniaxial strain reorients and forms a larger twisted defect ring to adjust to the new deformed geometry of the stretched droplet. Upon biaxial extension, the director field initially twists in the now oblate geometry and subsequently transitions into a uniform vertical orientation at high strains. In smectic microdroplets, on the other hand, LC alignment transforms from a radial smectic layering to a quasi-flat layering in a compromise between interfacial and dilatation forces. Upon removing the mechanical strain, the smectic LC recovers its initial radial configuration; however, the oblate geometry traps the nematic LC in the metastable vertical state. These findings offer a basis for the rational design of LC-based flexible devices, including wearable sensors, flexible displays, and smart windows.

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“…Therefore, Cd-HCIA-1 sensing materials demonstrated good anti-interference capabilities against other interfering substances of the same type. Response time is key to fluorescent probe detection applications, and many experiments report only one time frame for response [37][38][39] without giving an exact response time. We used microcalorimetry to monitor the response time of the quenching process of NB@Cd-HCIA-1 systems containing different concentrations of NB solution (Fig.…”

Section: Fluorescence Sensing Characteristicsmentioning

confidence: 99%

The high fluorescence sensitivity property and quenching mechanism of one-dimensional Cd-HCIA-1 sensor for nitrobenzene

Song

Dong

Hou

et al. 2023

Phys. Chem. Chem. Phys.

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Tuning of birefringence, response time, and dielectric anisotropy by the dispersion of fluorescent dye into the nematic liquid crystal

Cited by 31 publications

References 31 publications

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

Effect of ion trapping behavior of TiO2 nanoparticles on different parameters of weakly polar nematic liquid crystal

Director Distortion and Phase Modulation in Deformable Nematic and Smectic Liquid Crystal Spheroids

The high fluorescence sensitivity property and quenching mechanism of one-dimensional Cd-HCIA-1 sensor for nitrobenzene

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