Nanocomposite system of a discotic liquid crystal doped with thiol capped gold nanoparticles

Khare, Akanksha; Uttam, Rahul; Kumar, Sandeep; Dhar, Ravindra

doi:10.1016/j.molliq.2022.120215

Cited by 10 publications

(7 citation statements)

References 64 publications

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“…With the change in phase, its structure and permittivity change. Therefore, a change in the value of permittivity is observed with the change of phase . As there is no orientation of molecules in the isotropic phase, the value of both components of permittivity remains the same.…”

Section: Resultsmentioning

confidence: 97%

“…Therefore, a change in the value of permittivity is observed with the change of phase. 42 As there is no orientation of molecules in the isotropic phase, the value of both components of permittivity remains the same. However, on decrease of temperature below T IN , it is observed that the molecules try to orient themselves in a planar or homeotropic manner leading to two different values of permittivity as can be seen in Figure 7 .…”

Section: Resultsmentioning

confidence: 99%

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Gold Nanorod-Induced Effects in a Mesogenic Compound 4-(trans-4-n-Hexylcyclohexyl) isothiocyanatobenzene

Lal,

Verma,

Chirra

et al. 2023

ACS Omega

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Gold nanorods (GNRs) have a capsule-like structure with different optical properties than spherical gold nanoparticles due to surface plasmon resonance. Liquid crystals (LCs) are mesogenic compounds having crystal-like orientation and liquid-like fluidity. They are important materials from a technological point of view. Both GNRs and LC compounds are anisotropic in shape and properties. Different nano entities show interesting results when dispersed in different liquid crystalline materials which are instrumental from the application point of view. In the present work, GNRs have been dispersed in nematic liquid crystalline materials, namely 4-(trans-4-n-hexylcyclohexyl) isothiocyanatobenzene (6CHBT). Calorimetric, texture, spectroscopic, and dielectric studies were carried out for a pure 6CHBT and its composites with GNRs. Different calorimetric and dielectric parameters such as transition temperature, enthalpy, heat flow, permittivity, dielectric strength, dielectric anisotropy, and relaxation frequency have been determined, and the effect of GNRs has been explored. This article gives an insight into the influence of GNRs on the morphology and anisotropic physical properties of the nematic liquid crystalline material.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Gold Nanorod-Induced Effects in a Mesogenic Compound 4-(trans-4-n-Hexylcyclohexyl) isothiocyanatobenzene

Lal,

Verma,

Chirra

et al. 2023

ACS Omega

Self Cite

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“…Contributions from electrode polarization effects as well as from Maxwell−Wagner−Sillars polarization (the latter in heterogeneous systems) appear at lower frequencies as well-documented in literature. 29,30,32,33 X-ray Scattering. Wide-angle X-ray scattering (WAXS) measurements were made using Cu Kα radiation (λ = 1.54184 nm) with a Bruker D8 ADVANCE 2θ diffractometer, equipped with the detector LYNXEYE XE-T.…”

Section: Methodsmentioning

confidence: 99%

“…The precursor HBC (7) has a low dc-conductivity comparable to other nonionic DLCs. 32,33 On the other hand, HBCs with large counterions have dcconductivities some orders of magnitude higher than HBCs bearing the smaller counterions (Figure S5, Supporting Information). We will return to this point later (with respect to Figure 5).…”

Section: Ionic Conductivitymentioning

confidence: 99%

Interplay of Ion-Conduction and Nanoscale Self-Assembly in Amphiphilic Janus-Type Hexa-peri-hexabenzocoronenes

Weigold,

Spyridakou,

Tzourtzouklis

et al. 2024

ACS Appl. Nano Mater.

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Ionic discotic liquid crystals combine ion conduction with fluid, yet ordered, liquid crystal phases at ambient temperature, making them suitable nanomaterials for ion transport and energy storage. A series of Janus-type hexa-peri-hexabenzocoronenes (HBCs) with ionic (sulfonate) groups covalently bonded to the HBC core, and tetraalkylammonium counterions (sizes from 0.15 to 0.95 nm) are synthesized and investigated with respect to the self-assembly and ion dynamics. We find that the counterion size affects the nanoscale selfassembly and ionic conductivity in opposite ways. Smaller counterions act as structure formers, whereas larger ones act as structure breakers. The latter exhibits the highest ion dc-conductivity. We quantify the effect of Coulomb interactions on the self-assembly, the glass temperature T g (which was found to vary by 30 K), and the dc-conductivity (varying by 4 orders of magnitude). The precise synthesis of tailor-made ionic discotic liquid crystals with the HBC core and the characterization of their physical properties revealed that ion-conduction and nanoscale self-assembly in HBCs can be modulated by tuning electrostatic interactions, e.g., by adjusting the size of counterions.

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“…By inclusion of highly conductive nanoparticles in DLC materials, e.g., gold, silver, or other metallic nanoparticles, as well as carbon nanostructures, e.g., carbon nanotubes (CNTs), , one can design nanocomposites (NCs) with enhanced electrical conductivity and other valuable properties, keeping the LC behavior of the NCs. In relevant applications, the combination of DLCs and nanomaterials is advantageous. − In the development of advanced multifunctional NCs, of special interest are the single wall CNTs (SWCNTs), due to their unique mechanical, thermal, and electrical properties. These prospective nanomaterials and their networks composed of either aligned or disordered SWCNT assemblies have a wide application in nanoscale-sized organic microelectronics, optoelectronics, and photonics, OPVs, and sensorics, among others .…”

Section: Introductionmentioning

confidence: 99%

Photoluminescent Thin Films of Room-Temperature Glassy Tris(keto-hydrozone) Discotic Liquid Crystals and Their Nanocomposites with Single-Walled Carbon Nanotubes for Optoelectronics

Hadjichristov

Marinov

2023

ACS Omega

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This study addresses the photoresponse of liquid-crystalline tris(keto-hydrozone) discotic (TKHD)a star-shaped molecular structure with three branches. Object of our research interest was also TKHD filled with single-walled carbon nanotubes (SWCNTs) at a concentration of 1 wt %. At room temperature, the discotic liquid crystals in thin films (thickness 3 μm) of both TKHD and nanocomposite SWCNT/TKHD were in a glassy state. Such glassy thin films exhibited photoluminescence ranging from the deep-red to the near-infrared spectral region, being attractive for organic optoelectronics. The addition of SWCNTs to TKHD was found to stabilize the photoluminescence of TKHD, which is of significance for optoelectronic device applications. The photothermoelectrical response of highly conductive SWCNT/TKHD nanocomposite films was characterized by electrical impedance spectroscopy in the frequency range from 1 Hz to 1 MHz of the applied electric field. It was elucidated that the reversible photothermoelectrical effect in SWCNT/TKHD films occurs through SWCNTs and their network.

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Nanocomposite system of a discotic liquid crystal doped with thiol capped gold nanoparticles

Cited by 10 publications

References 64 publications

Gold Nanorod-Induced Effects in a Mesogenic Compound 4-(trans-4-n-Hexylcyclohexyl) isothiocyanatobenzene

Gold Nanorod-Induced Effects in a Mesogenic Compound 4-(trans-4-n-Hexylcyclohexyl) isothiocyanatobenzene

Interplay of Ion-Conduction and Nanoscale Self-Assembly in Amphiphilic Janus-Type Hexa-peri-hexabenzocoronenes

Photoluminescent Thin Films of Room-Temperature Glassy Tris(keto-hydrozone) Discotic Liquid Crystals and Their Nanocomposites with Single-Walled Carbon Nanotubes for Optoelectronics

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