Synthesis, characterisation, mesomorphic investigation and temperature-dependent Raman study of a novel calamitic liquid crystal: methyl 4-(4′-<i>n</i>-alkoxybenzylideneamino)benzoate

Nandi, Rajib; Singh, Hemant Kumar; Singh, Sachin Kumar; Singh, B.; Singh, Ranjan K.

doi:10.1080/02678292.2013.791380

Cited by 25 publications

(5 citation statements)

References 28 publications

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“…The transition temperature of HAT6 between plastic crystalline and columnar liquid-crystalline phase and between columnar liquid-crystalline and isotropic phase were 67.72 and 98.82 °C, respectively. From Figure c, HAT6 exhibited obvious optical birefringence of liquid crystals at 90 °C, resulting from the interlayer movement of the stacking molecules …”

Section: Resultsmentioning

confidence: 96%

“…From Figure 1c, HAT6 exhibited obvious optical birefringence of liquid crystals at 90 °C, resulting from the interlayer movement of the stacking molecules. 27 As shown in Table 1, the TE performances of SWCNT/ HAT6 composites as well as the pristine SWCNTs film were investigated at room temperature in terms of three important thermoelectric parameters (S, σ, and PF). On the basis of the S of 25.54 ± 2.31 μV K −1 for pristine SWCNTs, the positive value indicated that oxygen-doped SWCNTs and p-type (hole) carriers had dominated the thermoelectric transport.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Promoting the Thermoelectric Performance of Single-Walled Carbon Nanotubes by Inserting Discotic Liquid-Crystal Molecules

Zhou

et al. 2021

ACS Sustainable Chem. Eng.

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Single-walled carbon nanotubes (SWCNTs) are desirable flexible thermoelectric materials in applications of large-scale low-grade thermal energy. However, weak Seebeck coefficients of SWCNTs around room temperature limit their development as a flexible power generator. In this work, we significantly improve the Seebeck coefficients of SWCNT-based composites by integrating the discotic liquid-crystal 2,3,6,7,10,11-hexakis(hexyloxy) triphenylene (HAT6) through the energy-filtering effect. The Seebeck coefficients of SWCNT/HAT6 composite films are about more than twice that of the pristine SWCNT films, and a maximum power factor of 408.23 ± 48.96 μW m −1 K −2 is achieved at room temperature, which is one of the highest values among organic small-moleculebased thermoelectric composites reported so far. The flexible power generator based on p-type SWCNT/HAT6 films is first assembled. An outstanding power density of 0.64 μW cm −2 with a thermoelectric voltage of 17.64 mV at a temperature gradient of 56 K is achieved. This study demonstrates that SWCNT/ discotic liquid-crystal composites show great promise in thermoelectric (TE) materials and open a new avenue for the development of TE devices.

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Section: Resultsmentioning

confidence: 96%

Section: ■ Results and Discussionmentioning

confidence: 99%

Promoting the Thermoelectric Performance of Single-Walled Carbon Nanotubes by Inserting Discotic Liquid-Crystal Molecules

Zhou

et al. 2021

ACS Sustainable Chem. Eng.

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“…This region is extremely sensitive and provides a clear picture of the molecular structural transformation at the phase transitions [25] and [26]. The title molecule 12O(OH)2MA8 consists of four phenyl rings linked with azo-ester-imine linkages that favor the formation of inter or intramolecular hydrogen bonding [27].…”

Section: The Analysis Of Region 1060-1160 CM à1mentioning

confidence: 99%

Study of phase transitions in a bent-core liquid crystal probed by infrared spectroscopy

Singh

Srivastava

et al. 2016

Vibrational Spectroscopy

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“…In addition to the spectroscopic properties, we have also performed computer simulations to define the molecular structure of organic semiconducting materials and non-linear optical constants like isotropic polarizability, polarizability anisotropy, and first-order hyperpolarizability. Equations (7)- (10) have been utilized to calculate the parameters mentioned below [45]: The values of α and β have been obtained from the Gaussian output file and are presented in the atomic units. All of these parameters obtained are listed in table 3.…”

Section: Electro-optical Properties Of Hatn N = 5-8mentioning

confidence: 99%

“…When examined under crossed polarizers, a fan-shaped structure indicates the hexagonal columnar phase. The stacking molecules' interlayer movement produces this optical pattern [10].…”

Section: Introductionmentioning

confidence: 99%

Theoretical prediction (DFT) and experimental observation of electronic and electro-optical properties of HATn (n = 5,6,7,8) molecules for optoelectronic applications

Mishra,

Pal,

Shah

et al. 2024

Phys. Scr.

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The formation of triphenylene core-based discotic mesogens exhibiting a classical columnar phase led to several superior electronic and optoelectronic applications. The present work reports the theoretical investigation of discotic hexaalkoxytriphenylene (HATn; n = 5, 6, 7, 8) mesogens including electro-optical, electronic, and thermodynamic properties using density functional theory (DFT) as a computational quantum mechanical tool. The various physical and chemical properties of these mesogens, such as electronegativity, specific heat capacity, polarizability, absorption, and dipole moment are calculated computationally and discussed in the study. The simulation study reveals the variation in physical properties either follows the odd–even effect or changes monotonically for HATn series. Experiment has been performed for comparison with the theoretical results. The physical and chemical properties of these discotic mesogens change with alkyl chain length variation and explain the structure–property correlation in the molecules. The obtained results of the designed molecular structure held promising applications for optoelectronic devices based on discotic mesogens.

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Synthesis, characterisation, mesomorphic investigation and temperature-dependent Raman study of a novel calamitic liquid crystal: methyl 4-(4′-n-alkoxybenzylideneamino)benzoate

Cited by 25 publications

References 28 publications

Promoting the Thermoelectric Performance of Single-Walled Carbon Nanotubes by Inserting Discotic Liquid-Crystal Molecules

Promoting the Thermoelectric Performance of Single-Walled Carbon Nanotubes by Inserting Discotic Liquid-Crystal Molecules

Study of phase transitions in a bent-core liquid crystal probed by infrared spectroscopy

Theoretical prediction (DFT) and experimental observation of electronic and electro-optical properties of HATn (n = 5,6,7,8) molecules for optoelectronic applications

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