Thermal diffusivity control in titanium dioxide nanofluid through phase tuning

Sebastian, Riya; Swapna, M. S.; Raj, Vimal; Hari, Misha

doi:10.1088/2053-1591/aab41d

Cited by 31 publications

(15 citation statements)

References 38 publications

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“…From this equation, it is clear that as the total particle size ( l s = ∑Δ x s ) increases, the k eff also increases. In one of our earlier works in a titanium dioxide (TiO 2 ) nanofluid, we showed that the thermal conductivity increases with particle size . The variation of effective thermal conductivity of the nanofluid calculated using eq with the particle size is shown in Figure .…”

Section: Theory and Discussionmentioning

confidence: 97%

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Generalized Theory of Thermal Conductivity for Different Media: Solids to Nanofluids

Sindhu

Iyer

2019

J. Phys. Chem. C

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The advent of nanotechnology in the 21st century opened a new branch of nanoscience known as nanofluids, finding a wide range of industrial applications especially in heat transfer. Though the theory of thermal conductivity of solids is well established, there is no such conclusive model to explain the thermal conductivity of nanofluids. In the present work we propose a generalized theory for thermal conductivity applicable to materials ranging from heterogeneous solids, porous materials, nanofluids, and ferrofluids. The model could explain the effective thermal conductivity of not only the combination of solids but also solid–fluid mixtures. The proposed theory could successfully link the existing models for porous solid materials and nanofluids as its special cases. The proposed model is verified against experimental data by simulating the theoretical equations.

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Section: Theory and Discussionmentioning

confidence: 97%

“…Variation of with particle size, (a and b) the theoretical plot and (c and d) the experimental plot, for alumina and TiO 2 nanofluids. , …”

Section: Theory and Discussionmentioning

confidence: 99%

Generalized Theory of Thermal Conductivity for Different Media: Solids to Nanofluids

Sindhu

Iyer

2019

J. Phys. Chem. C

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“…The steps involved in the synthesis of crystalline TiO 2 and the SiO 2 particles in the sol–gel process are shown in Figures 1 and 2. In the sol–gel process, hydrolysis and polymerization reaction of the precursors results in a colloidal suspension or a sol of TiO 2 (Sebastian et al , 2018). When the alkoxide precursor reacts in the presence of water, hydrolysis and condensation take place immediately resulting in the formation of larger and inhomogeneous particles.…”

Section: Experimental Workmentioning

confidence: 99%

Comparative analysis of anti-reflection coatings on solar PV cells through TiO₂and SiO₂nanoparticles

Sivakumar¹,

Gopalakrishnan

Razak³

2021

PRT

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Purpose Photon absorbance and reflectance are the most important parameters for the recombination of electron-hole pairs. Bandgap energy plays a vital role in photon absorption. That is, the photons with energy greater than band gap energy are absorbed. Also, the refractive index of semiconductors is responsible for photon reflection, as the surface with the highest refractive index will reflect more photons than a surface with have a low refractive index. The purpose of this paper is to improvise the absorbance and reduce the reflectance of photons on the front surface of solar cells. Design/methodology/approach Photon reflection is results in reduction in electron-hole pair generation due to the high refractive index of semiconductive materials. To overcome this problem, an Anti-reflection (AR) coating of TiO2 and SiO2 is undertaken on solar cells through the Sol-spin coating method. Finally, the effectiveness of the Anti-Reflection coating is scrutinized through UV Vis-Spectroscopy, which provides details regarding reflectance, absorbance and bandgap energy characteristics. Findings UV–visible spectroscopy was used to measure the responses from the samples. The samples responded to the ultraviolet and visible range of electromagnetic radiation perfectly. UV spectroscopy was done before and after the antireflection coating of TiO2 and SiO2 over the solar cell to find their corresponding extreme reflectance and absorbance values. The effects of TiO2 and SiO2 were evaluated from the results. Originality/value In this research work, the authors have done anti-reflection coating over solar cells with nanoparticles derived from sol-gel process. Absorbance of photons observed through diffuse reflection method.

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“…Certain studies claim that SSPM is caused by thermal lensing and call it thermal blooming. [241][242][243][244] Further, TLS technology was also used to measure thermo-optic properties. Recently, Sadrolhosseini et al observed the SSPM effect of graphene oxide with different diameters.…”

Section: Thermal Lens Effectmentioning

confidence: 99%

“…[ 238–240 ]

I false(t false) = I_{0} {([], 1 - δ {(1 + \frac{t_{c}}{2 t})}^{- 1} + ((), \frac{δ^{2}}{2}) {(1 + \frac{t_{c}}{2 t})}^{- 2})}^{- 1}

Certain studies claim that SSPM is caused by thermal lensing and call it thermal blooming. [ 241–244 ] Further, TLS technology was also used to measure thermo‐optic properties. Recently, Sadrolhosseini et al.…”

Section: Physical Origin Of Sspm Effect Based On 2d Materialsmentioning

confidence: 99%

Recent Advances in Spatial Self‐Phase Modulation with 2D Materials and its Applications

et al. 2020

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In recent years, spatial self-phase modulation (SSPM) with two-dimensional (2D) materials has attracted the attention of many researchers as an emerging and ubiquitous nonlinear optical effect. In this review, the state of the art of 2D material-based SSPM is summarized. SSPM measures or tunes the nonlinearity of 2D materials, and it is also an effective approach to study the band structure of 2D materials. Several modified forms of SSPM, such as high-order, white-light-excited, vector field excited, and optically nonlinearly enhanced SSPM are also presented. Subsequently, the physical origin of the SSPM formation mechanism is compared and analyzed. Furthermore, the applications of SSPM with 2D materials, including passive photonic devices, generation of Bessel beams, and identifying the mode of the orbital angular momentum, are listed. Finally, several urgent problems of the SSPM with 2D materials, potential applications, and prospects for future development are presented.

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Thermal diffusivity control in titanium dioxide nanofluid through phase tuning

Cited by 31 publications

References 38 publications

Generalized Theory of Thermal Conductivity for Different Media: Solids to Nanofluids

Generalized Theory of Thermal Conductivity for Different Media: Solids to Nanofluids

Comparative analysis of anti-reflection coatings on solar PV cells through TiO₂and SiO₂nanoparticles

Recent Advances in Spatial Self‐Phase Modulation with 2D Materials and its Applications

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Thermal diffusivity control in titanium dioxide nanofluid through phase tuning

Cited by 31 publications

References 38 publications

Generalized Theory of Thermal Conductivity for Different Media: Solids to Nanofluids

Generalized Theory of Thermal Conductivity for Different Media: Solids to Nanofluids

Comparative analysis of anti-reflection coatings on solar PV cells through TiO2and SiO2nanoparticles

Recent Advances in Spatial Self‐Phase Modulation with 2D Materials and its Applications

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Product

Resources

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Comparative analysis of anti-reflection coatings on solar PV cells through TiO₂and SiO₂nanoparticles