Design, Synthesis and Characterization of Hydrogen Bonded Binary Liquid Crystal Complex from 4-Methoxycinnamic Acid and 4-Hexyloxybenzoic Acid (4MCA:6OBA)

Kumar, Thamilarasan Ranjeeth; Sundaram, S.; Chitravel, T.; Jayaprakasam, R.; Vijayakumar, V. N.

doi:10.1515/zpch-2016-0955

Cited by 14 publications

(7 citation statements)

References 31 publications

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“…As the ether block ratio of the copolymer was increased, the rainbow circular nematic disclinations were observed under a polarized microscope. The emergence of the circular texture of the nematic phase is related to the strength-number of LC 56,57 (In this case, the strength-number is equal to +1) (see supplementary data, Figure S1). The colors are due to the variation in the molecular orientation of LC copolymers in toluene.…”

Section: Methodsmentioning

confidence: 99%

Polyaniline–calcium titanate perovskite hybrid composites: Structural, morphological, dielectric and electric modulus analysis

Bibi

Shakoor

Niaz

2022

Polymers and Polymer Composites

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This paper reports hybrid composites based on polyaniline (PANI) and calcium titanate (CaTiO3) perovskite as a nanofiller synthesized by in-situ polymerization technique. Their structure and morphology were investigated by X-ray diffraction analysis and scanning electron microscopy. The XRD analysis shows that the addition of CaTiO3 in polyaniline reduced the amorphous structure of polyaniline transforming it into semi-crystalline nature, which agrees well with the higher conductivity. Scanning electron microscopy of composites showed a more compact and homogenous structure with uniform distribution of CaTiO3 in the polymer matrix. Dielectric parameters such as dielectric constant, loss factor, and dielectric loss, real and imaginary parts of electric modulus were measured and evaluated as a function of frequency and temperature as well. The variation of dielectric properties and ac conductivity reveals that the dispersion is due to the Maxwell-Wagner type of interfacial polarization. The observed ac conductivity behavior of polyaniline in the presence of calcium titanate was discussed in the framework of Jonscher’s power law. The result showed that ac conductivity increases with the rise of the frequency of applied field and temperature analogous to the semiconducting behavior of composites. Temperature-dependent behavior of frequency exponent seems to obey correlated barrier hopping conduction mechanism. The relaxation behavior of the synthesized samples was analyzed by the electric field modulus and was found to decrease with temperature and CaTiO3 content and increase with frequency.

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Section: Methodsmentioning

confidence: 99%

Polyaniline–calcium titanate perovskite hybrid composites: Structural, morphological, dielectric and electric modulus analysis

Bibi

Shakoor

Niaz

2022

Polymers and Polymer Composites

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“…Synthetic procedure of binary liquid crystal mixture is reported. [15] The optimized geometry of ECA+MCA liquid crystal mixture is illustrated in Fig. 1.H-bond in the ECA+MCA liquid crystal mixture is confirmed by FT-IR (ABB BOMEM, Canada) technique.…”

mentioning

confidence: 93%

“…

mesogenic behavior of mixtures due to its unique mesomorphic nature and stability. [15] This study aimed to improve binary liquid crystal mixtures through H-bonding in experimental as well as theoretical (DFT) point of view.

2.Experimental details4-Ethoxycinnamic acid (ECA), 4-Methoxycinnamic acid (MCA) and solvents such as Dimethylformamide (DMF) were purchased from TCI, Tokyo, Japan. Synthetic procedure of binary liquid crystal mixture is reported.

…”

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confidence: 99%

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Optical and thermal studies on binary liquid crystal mixture

Sundaram¹,

Vasanthi²,

Jayaprakash³

et al. 2021

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The novel binaryliquid crystal mixture is designed and synthesized from 4-methoxycinnamic acid (MCA) and 4-ethoxycinnamic acid (ECA). Quantum chemical (DFT) calculation for MCA+ECA geometry is optimized by DFT/B3LYP with 6-311G (d, p) basis set and its results are good agreement with experimental data. Fourier-transform infrared spectroscopic(FT-IR) study confirm the presence of intermolecular hydrogen bond in the liquid crystal mixture .The paramorphic changes in nematic phase and thermo-optic properties of binary liquid crystal mixture isanalyzed using polarizing optical microscope (POM) and differential scanning calorimetry (DSC) techniques. A noteworthy observation in the present liquid crystal mixture possesses smectic A phase along with nematic phases. Intermolecular hydrogen bond interaction and it’s stabilization energy of present mixture is studied by natural bond orbital (NBO) analysis. Due to the transition,the presen tliquid crystal mixtur einduces smecticA phase. The molecular properties of presen t binary liquid crystal mixtureis analyzed by HOMO-LUMO and experimental UV-Visible studies. Thermal spanwidth, stability factor and quantum chemical properties of the liquid crystal mixture are calculated.Molecular electrostatic potential, mulliken atomic charge distribution of the optimized MCA+ECA geometry is also reported.

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“…Different properties LCs' are needed for diverse applications areas. For these reasons, the required enhanced properties of liquid crystals are obtained by synthesizing a new liquid crystals [8,9] and/or a mixture of two or more different liquid crystals [10][11][12] and/or using polymer [13][14][15], nanoparticles [16][17][18][19] and dyes [20,21] and/or using at least two of them to reveal their LC behavior [22][23][24]. Among all of them, NPs are very important to obtain liquid crystals having different physical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

2018

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Hexylcyanobiphenyl liquid crystal was doped with graphene oxide at ratios %0.25GO, %0.5GO, %1GO and %2GO, and the change in physical properties of pristine and the doped liquid crystals has been investigated. The phase transitions of prepared samples were studied by differential scanning calorimeter and polarized optical microscopy. The differential scanning calorimeter and polarized optical microscopy results are in good agreement when examining the nematic-isotropic liquid phase transition temperatures of the hexylcyanobiphenyl. The liquid crystal texture images obtained with polarized optical microscopy reveals that thermal stability of sample changed with graphene oxide concentration, i.e., increased with graphene oxide concentration. Impedance, capacitance, conductivity and real and imaginary dielectric constants of the pure and doped liquid crystals were obtained depending on frequency and voltage at the room temperature by using impedance analyzer. These electrical properties of the pure and the graphene oxide-doped samples showed an increase with increasing the graphene oxide ratio. The voltage-dependent light transmittance experiment revealed that threshold voltage of LC cells decreased for %0.25GO-and % 1GO-dispersed samples, but it was increased at %0.5GO-and %2GO-dispersed samples.

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Design, Synthesis and Characterization of Hydrogen Bonded Binary Liquid Crystal Complex from 4-Methoxycinnamic Acid and 4-Hexyloxybenzoic Acid (4MCA:6OBA)

Cited by 14 publications

References 31 publications

Polyaniline–calcium titanate perovskite hybrid composites: Structural, morphological, dielectric and electric modulus analysis

Polyaniline–calcium titanate perovskite hybrid composites: Structural, morphological, dielectric and electric modulus analysis

Optical and thermal studies on binary liquid crystal mixture

Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

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