Enhanced Thermal Lens Effect in Gold Nanoparticle-Doped Lyotropic Liquid Crystal by Nanoparticle Clustering Probed by Z-Scan Technique

Lenart, Vinícius Mariani; Turchiello, Rozane de Fátima; Goya, Gerardo F.; Gómez, Sergio L.

doi:10.1007/s13538-015-0301-7

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…𝜀 𝐹 𝜀 𝐹 −ℏ𝜔 (13) Where d is the distance between the center of adsorbed molecule and the image plane.…”

Section: Fig 1 Geometry Of the Problemmentioning

confidence: 99%

“…It was considered in the majority of experimental [13][14][15] and theoretical works [11,12,[16][17][18][19] that the width of SPR line varies smoothly with the variation of the dielectric permittivity of the environment. It was established in the work [20] in the frameworks of the finite equations method that the width of SPR line oscillates as the dielectric permittivity function of the environment.…”

Section: Introductionmentioning

confidence: 99%

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An optical absorption of the composite with the nanoparticles, which are covered by the surfactant layer

Smirnova

Maniuk

Korotun

et al. 2023

Phys. Chem. Solid St.

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The optical properties of the nanocomposite with two-layer spherical inclusions “metallic core – surfactant layer” have been studied in the work. The question connected with an influence of the processes at the interface “metal – adsorbate” on the excitation of the surface plasmonic resonances in the nanoparticle has been studied. The fact of splitting of the surface plasmonic resonance due to the influence of the absorption bond near the surface of the metallic nanoparticles and due to the emergence of the additional energy states has been established. The relations for the effective parameters which describe the losses of coherence under the scattering at the chemical interface have been obtained. The calculations for the frequency dependencies of the diagonal components of the dielectric permittivity tensor of the two-layer nanoparticle and for the absorption coefficient of the nanocomposite have been performed. It has been shown that the frequency dependencies for the real and imaginary parts of the longitudinal component of the dielectric tensor are close to the similar dependencies for the real and imaginary parts of the dielectric function for the spherical metallic nanoparticle. At the same time the real and imaginary parts of the transverse component weakly depend on the frequency in the visible spectrum and oscillate in the infrared range. It has been established that the absorption coefficient of the composite can have one or two maximums depending on the sizes and the material of the particles-inclusions.

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“…𝜀 𝐹 𝜀 𝐹 −ℏ𝜔 (13) Where d is the distance between the center of adsorbed molecule and the image plane.…”

Section: Fig 1 Geometry Of the Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An optical absorption of the composite with the nanoparticles, which are covered by the surfactant layer

Smirnova

Maniuk

Korotun

et al. 2023

Phys. Chem. Solid St.

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“…An important contribution of the thermal conductivity of a nanouid is the aggregation of the NPs. It has been observed that aggregation of metallic or plasmonic NPs leads to both an enhancement of the conversion of electromagnetic energy to heat [19,20] and of thermal conductivity [21]. Particularly, ferrouids display a strong enhancement of the thermal conductivity due to the formation of aggregates by dipolar interaction under a magnetic eld [22 24] and without an external eld at high concentrations [25].…”

Section: Introductionmentioning

confidence: 99%

Thermal diffusivity of ferrofluids as a function of particle size determined using the mode-mismatched dual-beam thermal lens technique

Lenart

Astrath

Turchiello

et al. 2018

Journal of Applied Physics

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Ferrouids are colloids of superparamagnetic nanoparticles that are envisaged for use in hyperthermia, which is based on nonradiative relaxation after interaction with a high-frequency magnetic eld or light. For such applications, an important parameter is the thermal diusivity. In this communication, we present an experimental study of the dependence of thermal diusivity of ferrouids on the size of the magnetite nanoparticles by employing the mode-mismatched thermal lens technique. The results show a huge enhancement of the thermal diusivity by increasing the average size of the nanoparticles, while the number density of the nanoparticles is maintained as constant.

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“…For instance, studied in [13] was formation and behavior of surface plasmon resonance in thermotropic calamitic liquid crystals, and in [14] -strain in time of thermomechanical nematic liquid crystal elastomer. Effect of ANP on lyotropic liquid crystals similar to the body fluids was investigated in [15]. It was shown that lyotropic matrix induces aggregation of nanoparticles, which leads to a red shift of the surface plasmon resonance.…”

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.

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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.

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Enhanced Thermal Lens Effect in Gold Nanoparticle-Doped Lyotropic Liquid Crystal by Nanoparticle Clustering Probed by Z-Scan Technique

Cited by 9 publications

References 31 publications

An optical absorption of the composite with the nanoparticles, which are covered by the surfactant layer

An optical absorption of the composite with the nanoparticles, which are covered by the surfactant layer

Thermal diffusivity of ferrofluids as a function of particle size determined using the mode-mismatched dual-beam thermal lens technique

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

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