Conjugation of Nanomaterials and Nematic Liquid Crystals for Futuristic Applications and Biosensors

Choudhary, Amit; George, Thomas F.; Li, Guoqiang

doi:10.3390/bios8030069

Cited by 18 publications

(9 citation statements)

References 99 publications

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“…It is thus significant to seek signal-enhancement strategies for LC-based sensors to circumvent the problem. Several studies have demonstrated that the disruption of the LC orientation can be enhanced by introducing nanoparticles, thus leading to an amplified optical signal [434][435][436][437][438][439][440] (Figure 18a,b). A recent study by Wei et al demonstrated a nickel nanoparticle-assisted LC cell system that can be used to visualized the enzymatic activities between cholylglycine hydrolase (CGH) and cholylglycine (CG).…”

Section: Biosensorsmentioning

confidence: 99%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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The research field of liquid crystals and their applications is recently changing from being largely focused on display applications and optical shutter elements in various fields, to quite novel and diverse applications in the area of nanotechnology and nanoscience. Functional nanoparticles have recently been used to a significant extent to modify the physical properties of liquid crystals by the addition of ferroelectric and magnetic particles of different shapes, such as arbitrary and spherical, rods, wires and discs. Also, particles influencing optical properties are increasingly popular, such as quantum dots, plasmonic, semiconductors and metamaterials. The self-organization of liquid crystals is exploited to order templates and orient nanoparticles. Similarly, nanoparticles such as rods, nanotubes and graphene oxide are shown to form lyotropic liquid crystal phases in the presence of isotropic host solvents. These effects lead to a wealth of novel applications, many of which will be reviewed in this publication. the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About 25 different thermotropic phases are known to date, and they are still increasing in number. Appl. Sci. 2019, 9, x FOR PEER REVIEW 2 of 47 unique effects of the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About...

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Section: Biosensorsmentioning

confidence: 99%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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“…The experimental evidence for such transitions are found in Refs. [4][5][6][7][8][9]17] and indicate a close relation between the average DNPs shape and the type of the ordered morphology. Therefore, we attempt to steer the self-assembly towards particular morphology by influencing the DNPs shape.…”

Section: Temperature Driven Morphology Changesmentioning

confidence: 67%

“…Self-assembly process becomes more controllable by decoration of nanoparticles with functional ligands. Good example is decorated nanoparticles (DNP) coated by the liquid crystalline (LC) ligands [4][5][6][7][8][9] that are considered in this chapter.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Nanoparticles Decorated by Liquid Crystalline Groups: Computer Simulations

Ilnytskyi¹

2020

Self-Assembly of Nanostructures and Patchy Nanoparticles

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We present the results of the computer simulations for the self-assembly of decorated nanoparticles. The models are rather generic and comprise a central core and a shell of ligands containing terminal liquid crystalline group, including the case of the azobenzene chromophores. The simulations are performed using the coarse-grained molecular dynamics with the effective soft-core interparticle interaction potentials obtained from the atomistic simulations. The discussion is centred around the set of the self-assembled morphologies in a melt of 100–200 of such decorated nanoparticles obtained upon the change of the temperature, surface density of ligands, the type of the terminal group attachment, as well as the prediction of the possibility of photo-assisted self-assembly of the nanoparticles decorated by the azobenzene chromophores.

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“…The change in these and other parameters of NLCs by the addition of NMs has been attributed to the rearrangement of the NLC molecules around the NMs (QDs and NPs in this case). The present work is not intended to present a full overview of wide rich work on dispersion of QDs or NPs into NLCs as these may be found in nice reviews given elsewhere [51][52][53][54][55]. Based on the few recent and important works, we have made an attempt to address the question how the dispersion of quantum dots or nanoparticles in pristine nematic LC geometry influences the properties of NLC material to make the composite system suitable for various applications.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Impact of Dispersion of Nanoscale Particles on the Properties of Nematic Liquid Crystals

Singh

2019

Crystals

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This work reviews the recent progress made in last decade in understanding the role of dispersion ofnanoparticles and quantum dots into host nematic liquid crystals. There are two important ingredients of this work: Even a minute concentration of these non-mesogenic materials in host matrix can have reflective impact on the dielectric, electro-optical, and spectroscopic properties of host nematics and the nematic-nanoparticles composite systems become suitable for the use in nematic based display and other devices.

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Conjugation of Nanomaterials and Nematic Liquid Crystals for Futuristic Applications and Biosensors

Cited by 18 publications

References 99 publications

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Self-Assembly of Nanoparticles Decorated by Liquid Crystalline Groups: Computer Simulations

Impact of Dispersion of Nanoscale Particles on the Properties of Nematic Liquid Crystals

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