Enhanced thermal diffusivity of water based ZnO nanoflower/rGO nanofluid using the dual-beam thermal lens technique

Mathew, Susan; Francis, Frincy; Joseph, Santhi Ani; Kala,

doi:10.1016/j.nanoso.2021.100784

Cited by 10 publications

(15 citation statements)

References 42 publications

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“…On the contrary, TLS is highly sensitive to rather slight changes in the sample composition and also requires minimal sample preparation [ 42 , 43 ]. Emphasis of TLS application in this area is placed on the accurate calculation of thermophysical properties of nanofluids [ 36 , 43 , 44 , 45 , 46 ], biodiesel [ 47 , 48 ] solid multicomponent systems [ 49 ], nanoparticles [ 50 , 51 , 52 ], quantum dots [ 53 ], glasses [ 54 , 55 , 56 ], and semiconductors [ 57 ].…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

2023

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Thermal-lens spectrometry is a sensitive technique for determination of physicochemical properties and thermophysical parameters of various materials including heterogeneous systems and nanoparticles. In this paper, we consider the issues of the correctness (trueness) of measurements of the characteristic time of the thermal-lens effect and, thus, of the thermal diffusivity determined by dual-beam mode-mismatching thermal lensing. As sources of systematic errors, major factors—radiation sources, sample-cell and detector parameters, and general measurement parameters—are considered using several configurations of the thermal-lens setups, and their contributions are quantified or estimated. Furthermore, with aqueous ferroin and Sudan I in ethanol as inert colorants, the effects of the intermolecular distance of the absorbing substance on the correctness of finding the thermophysical parameters are considered. The recommendations for checking the operation of the thermal-lens setup to ensure the maximum accuracy are given. The results obtained help reducing the impact of each investigated factor on the value of systematic error and correctly measure the thermophysical parameters using thermal-lens spectrometry.

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Section: Introductionmentioning

confidence: 99%

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

2023

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“…At the same time, the Brownian motion is considered to be the key mechanism for heat transfer: the higher the concentration, the more difficult it is for heat transfer to neighboring NPs and the lower the thermal diffusivity [35]. Previously, with an aqueous dispersion of ZnO-graphene oxide composites as an example, it was found that an increase in D is observed at low concentrations, and a sharp decrease at higher concentrations in [11]. This allowed the authors to assume about the heat transfer mechanism.…”

Section: Thermal Diffusivity Of Sio2 Nanofluidsmentioning

confidence: 99%

“…This allowed the authors to assume about the heat transfer mechanism. They associated it with the Brownian motion of NPs in the medium and the leading role of nanoparticles in the composite for heat transfer: when the concentration is low, Brownian motion is high and heat is transferred quickly, but when a certain concentration is reached, composites agglomerate, which prevents the free movement of NPs in the volume and thermal conductivity decreases [11].…”

Section: Thermal Diffusivity Of Sio2 Nanofluidsmentioning

confidence: 99%

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Thermal Diffusivity of Aqueous Dispersions of Silicon Oxide Nanoparticles by Dual-Beam Thermal-Lens Spectrometry

Khabibullin¹,

Usoltseva²,

Mikheev³

et al. 2023

Preprint

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The growing interest in heat-conducting nanofluids requires highly sensitive methods for analyzing thermal properties. Thermal-lens spectrometry, despite its advantages over classical methods, does not have a general approach to measuring and interpreting results for dispersed systems. In this paper, by the example of nanofluids of silicon oxide in water in a wide range of concentrations and sizes, the selection of measurement parameters for transient and steady-state thermal lensing is justified, and the interpretation of the results of thermal diffusivity measurements is substantiated. The features of measurements of thermal diffusivity by thermal lens spectrometry under stationary state for dispersed systems are considered. Using this approach, it is possible to detect and distinguish thermal effects with high accuracy. For dispersions of silicon oxide, with increasing concentration, the thermal diffusivity passes through a minimum. Silicon oxide dispersions can be used both as a coolant or as a heat-removing liquid by selecting the particle size and concentration.

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“…For the filled-type high thermal conductive epoxy composites, the continuously thermal conductive pathway can be built by adding high thermal conductive inorganic fillers into the epoxy matrix, and the TC may increase significantly. [9,10] Generally, high content of fillers are needed to build thermal conductive pathway, but the interfacial thermal resistance between fillers/epoxy has a negative effect on the TC of epoxy composites, [11] especially high loading inorganic fillers may affect the processability and mechanical property. The interfacial thermal resistance of the polymer/fillers is mainly due to a large mismatch in the inherent phonon spectrum.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Electrical Properties of Epoxy Composites Filled with 3D h‐BN/TOCNF Fillers

Chi

Zhang

et al. 2022

Macro Materials & Eng

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Epoxy resin (EP) has been widely used in electronic packaging and electrical equipment due to its excellent electrical insulating properties. However, the low thermal conductivity (TC) of EP limits its wider application and needs to be further improved. In this study, 3D hexagonal boron nitride (3D h‐BN) is successfully synthesized by utilizing TEMPO oxidated cellulose nanofiber hydrogels (TOCNF) as an interlocking skeleton, and then 3D h‐BN/TOCNF are chosen as the functional fillers to improve the TC of EP. The microstructure, TC, and electrical insulating properties of epoxy composites are systematically characterized and analyzed. The results show that epoxy composites filled with 3D h‐BN/TOCNF deliver a significantly improved TC and maintain excellent insulating properties. When the filled content of 3D h‐BN/TOCNF is 9 wt.%/21wt.%, a TC of 0.86 W (m K)−1 is obtained at 25 °C, which also demonstrates favorable electrical insulating properties with a volume resistivity of more than 1015 Ω m and breakdown strength of 186.1 kV mm−1. This work offers an efficient method to improve the thermal and electrical performances of EP for electronics and electrical engineering applications.

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Enhanced thermal diffusivity of water based ZnO nanoflower/rGO nanofluid using the dual-beam thermal lens technique

Cited by 10 publications

References 42 publications

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

Accuracy of Measurements of Thermophysical Parameters by Dual-Beam Thermal-Lens Spectrometry

Thermal Diffusivity of Aqueous Dispersions of Silicon Oxide Nanoparticles by Dual-Beam Thermal-Lens Spectrometry

Thermal and Electrical Properties of Epoxy Composites Filled with 3D h‐BN/TOCNF Fillers

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