Dielectric and electrical properties of nematic liquid crystals 6CB doped with iron oxide nanoparticles. The combined effect of nanodopant concentration and cell thickness

Kovalchuk, O.V.; Kovalchuk, T.M.; Tomašovičová, Natália; Τimko, M.; Zakuťanská, Katarína; Miakota, D.; Kopčanský, P.; Shevchuk, O.F.; Garbovskiy, Yuriy

doi:10.1016/j.molliq.2022.120305

Cited by 11 publications

(12 citation statements)

References 70 publications

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“…In the simplest case, for a given concentration of nanoparticles in molecular liquid crystals, measuring cells of several cell thickness can be utilized. A description of an experimental realization of this approach can be found in recent publication (Kovalchuk et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

A perspective on the Langmuir adsorption model applied to molecular liquid crystals containing ions and nanoparticles

Garbovskiy

2022

Front. Soft. Matter

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Electrical properties of molecular liquid crystals doped with nanomaterials have been extensively studied over the past two decades. In general, nanoparticles in liquid crystals can play a dual role acting as either ion capturing agents or ion generating objects. An interplay between ions and nanomaterials in liquid crystals can result in a great variety of nontrivial ionic effects. This perspective discusses the Langmuir adsorption model applied to describe ionic phenomena in molecular liquid crystals doped with nanoparticles. The applicability and limitations of this model are emphasized. Within a range of its applicability, the Langmuir adsorption model can be used to obtain a wealth of information about nanoparticle-induced ionic effects in molecular liquid crystals. In addition, this model also offers important improvements to standard experimental procedures for evaluation of electrical properties of advanced liquid crystal materials.

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Section: Discussionmentioning

confidence: 99%

A perspective on the Langmuir adsorption model applied to molecular liquid crystals containing ions and nanoparticles

Garbovskiy

2022

Front. Soft. Matter

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“…Interestingly, these values (i) are quite close to, but less than 1, and (ii) decrease with increasing temperature. It's worth noting that, in cases where the host LC phase is nematic, a super-power-law behavior (n 4 1) has been reported, [38][39][40][41] although each of these cases involved the presence of an electrically conducting additive. Thus, the observation of n o 1 for the DC phase studied needs attention.…”

Section: Dielectric Measurementsmentioning

confidence: 99%

Mesomorphic and dielectric properties of strategically designed chiral bent-core liquid crystals displaying wide temperature range dark conglomerate phase

Baghla,

Punjani,

Rao

et al. 2024

J. Mater. Chem. C

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“…However, as dopant, Metal oxides get major attentions for their capability to adopt different structural geometries that can exhibit interesting metallic, semiconducting or insulating character [13,14]. Metal oxide doped mesogenic hybrid materials has been reported using iron oxide [15,16], Bi4Ti3O12 [17], BaTiO3 [18] etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of mesogen-nanoparticle composites by doping 4-decyloxybenzoic acid with substrate-functionalized ZnO nanoparticle

Paul

Chakraborty

Deb

et al. 2023

CST

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Nanomaterials and Mesogenic materials are two important pillars of today’s science and technology, in the fields of both material and biological applications. Mesogens or liquid crystals (LC) are self-aggregated anisotropic fluids with long range order, and the nature of self-aggregation largely controls their physical and material properties. Doping of nanomaterials over liquid crystalline matrix can provide valuable tools for development of materials with new or improved properties. In the present work 4-decyloxybenzoic acid is taken as the mesogenic matrix. It is observed that, composite prepared by doping of 4-decyloxybenzoic acid mesogen matrix by ZnO nanoparticle pre-functionalized with the same mesogen, caused a marked alteration in the mesogenic behavior. With 3% doping of matrix pre-functionalized ZnO NP on 4- decyloxy benzoic acid, we could achieve a shift of about 31ºC in the N-Iso transition temperature and, a decrease of >10ºC for the onset of liquid crystallinity by this method without quenching any of the mesophases exhibited by the pure mesogen. The synthesized materials have been characterized by variable temperature Polarised optical microscopy (POM), DSC, FTIR, XRD, EDX, and TEM This process may be considered for preparation other nanoparticle-mesogen composites as well. It was observed that, the effect of doping on the transition temperature and enthalpy of 4-Decyloxybenzoic Acid can be significantly enhanced by pre-functionalizing the dopant (ZnO NP) with the substrate molecules and then mixing this substrate functionalized ZnO nanoparticle with the bulk substrate.

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Dielectric and electrical properties of nematic liquid crystals 6CB doped with iron oxide nanoparticles. The combined effect of nanodopant concentration and cell thickness

Cited by 11 publications

References 70 publications

A perspective on the Langmuir adsorption model applied to molecular liquid crystals containing ions and nanoparticles

A perspective on the Langmuir adsorption model applied to molecular liquid crystals containing ions and nanoparticles

Mesomorphic and dielectric properties of strategically designed chiral bent-core liquid crystals displaying wide temperature range dark conglomerate phase

Synthesis of mesogen-nanoparticle composites by doping 4-decyloxybenzoic acid with substrate-functionalized ZnO nanoparticle

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