Colloidal gold nanosphere dispersions in smectic liquid crystals and thin nanoparticle-decorated smectic films

Pratibha, R.; Park, Won; Smalyukh, Ivan I.

doi:10.1063/1.3330678

Cited by 85 publications

(54 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is associated with developing theoretical studies, including such basic approaches for the physics of liquid crystals as the Maier-Saupe or Landau-de-Gennes models [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. However, there are neither theoretical predictions nor experimental results regarding the form of pretransitional effects.…”

Section: Basics For the Isotropic -Mesophase Transitionmentioning

confidence: 99%

“…It is indicated that the electric field associated with NPs can influence the local orientational ordering, increase the isotropicnematic (I-N) transition temperature or decrease the switching voltage [1,2,[10][11][12]. All these have led to an increase of theoretical and experimental interest in LC-based nanocolloids [17][18][19][20][21][22][23][24][25][26][27][28][29]. Regarding experiments, particularly important are dielectric studies since they are strongly associated with practical implementations and their results can be compared with fundamental models of the physics of liquid crystal .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact ofBaTiO3nanoparticles on pretransitional effects in liquid crystalline dodecylcyanobiphenyl

Rzoska¹,

Starzonek²,

Drozd-Rzoska³

et al. 2016

Phys. Rev. E

View full text Add to dashboard Cite

2The pretransitional behavior of dodecylcyanobiphenyl (12CB, isotropic -smectic Asolid mesomorphism) with d=50nm BaTiO3 nanoparticles (NPs) linked to the cubic phase was monitored via temperature studies of dielectric constant. Tests were carried out in the isotropic, liquid crystal mesomorphic, and solid phases. For each phase transition the same value of the "critical" exponent ~ 0.5 was obtained, including nanocolloids. All phase transitions show the weakly discontinuous nature. The temperature metric of the discontinuity T notably decreases when adding nanoparticles. The addition of nanoparticles first decreases the dielectric constant by approximately 50 % in comparison with pure 12CB, but already for a concentration ~ x = 0.4 % NP an increase over 50 % takes place. It is notable that for the latter concentration unique hallmarks of the pretransitional effect emerge also for the solidmesophase transition. All these indicate the important impact of nanoparticles on multimolecular, mesoscale fluctuations.

show abstract

Section: Basics For the Isotropic -Mesophase Transitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact ofBaTiO3nanoparticles on pretransitional effects in liquid crystalline dodecylcyanobiphenyl

Rzoska¹,

Starzonek²,

Drozd-Rzoska³

et al. 2016

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…This can be achieved by using one of two general approaches; either by simple mixing of the two species [ 126 ], or modifying the surface chemistry of the particles and functionalizing them with liquid crystalline ligands [ 15 ]. Whilst these self-assembly techniques work to a large extent they suffer from the relatively low solubilities of the NPs in the host and the maximum size of the particles that it is possible to incorporate, although it has been reported that particles of up to 7 nm in diameter have been included in such systems [ 15 ].…”

Section: Referential Fabrication Techniquesmentioning

confidence: 99%

Self-assembled plasmonic metamaterials

et al. 2013

View full text Add to dashboard Cite

Nowadays for the sake of convenience most plasmonic nanostructures are fabricated by top-down nanofabrication technologies. This offers great degrees of freedom to tailor the geometry with unprecedented precision. However, it often causes disadvantages as well. The structures available are usually planar and periodically arranged. Therefore, bulk plasmonic structures are difficult to fabricate and the periodic arrangement causes undesired effects, e.g., strong spatial dispersion is observed in metamaterials. These limitations can be mitigated by relying on bottom-up nanofabrication technologies. There, self-assembly methods and techniques from the field of colloidal nanochemistry are used to build complex functional unit cells in solution from an ensemble of simple building blocks, i.e., in most cases plasmonic nanoparticles. Achievable structures are characterized by a high degree of nominal order only on a shortrange scale. The precise spatial arrangement across larger dimensions is not possible in most cases; leading essentially to amorphous structures. Such self-assembled nanostructures require novel analytical means to describe their properties, innovative designs of functional elements that possess a desired near-and far-field response, and entail genuine nanofabrication and characterization techniques. Eventually, novel applications have to be perceived that are adapted to the specifics of the self-assembled nanostructures. This review shall document recent progress in this field of research. Emphasis is put on bottom-up amorphous metamaterials. We document the state-of-the-art but also critically assess the problems that have to be overcome.

show abstract

“…In the works [4,5], being based on studies of the optical characteristics inherent to the mixture of ANP with LC, it was shown that aggregation of ANP can be reduced if using LC that has a smectic phase. The change in the optical or electrooptical properties of ferroelectric LC, when introducing ANP, was considered in [6][7][8][9]. The influence of ANP on non-linear optical properties of LC was studied in [10].…”

Section: Introductionmentioning

confidence: 99%

The non-linear dependence of 6СНВТ liquid crystal conductivity on the concentration of gold nanoparticles

Koval’chuk¹

2016

Semicond. Phys. Quantum Electron. Optoelectron.

View full text Add to dashboard Cite

Abstract.Within the frequency range 10 -1 …106 Hz at the temperature 293 K, the effect of gold nanoparticles on the dielectric properties of the planar-oriented nematic liquid crystal 6СНВТ has been studied. The concentration of nanoparticles with the average diameter 3 to 5 nm was chosen as 0.01, 0.02 and 0.1 wt.%. It has been shown that for the frequencies less than 10 Hz, the dielectric properties of the samples can be described with the Debye dispersion. For the samples with the concentration of gold nanoparticles 0.1 wt.%, the time of relaxation has been estimated (4.7±0.5 s). It has been also shown that the conductivity of the liquid crystal depends non-linearly on the concentration of nanoparticles introduced into the liquid crystal. The greatest change in conductivity of the liquid crystal on the concentration of introduced gold nanoparticles has been obtained within the range of 0.01 to 0.02 wt.%. It has been assumed that the conductivity of 6СНВТ that depends non-linearly on the concentration of introduced gold nanoparticles is caused by the competing processes of ion desorption from the gold nanoparticles and of nanoparticle aggregation.

show abstract

Colloidal gold nanosphere dispersions in smectic liquid crystals and thin nanoparticle-decorated smectic films

Cited by 85 publications

References 27 publications

Impact ofBaTiO3nanoparticles on pretransitional effects in liquid crystalline dodecylcyanobiphenyl

Impact ofBaTiO3nanoparticles on pretransitional effects in liquid crystalline dodecylcyanobiphenyl

Self-assembled plasmonic metamaterials

The non-linear dependence of 6СНВТ liquid crystal conductivity on the concentration of gold nanoparticles

Contact Info

Product

Resources

About