Thermal Diffusivity of Gold Nanoparticle Reduced by Polyvinyl Alcohol Using Dual Beam Thermal Lens Technique

Thomas, Lincy; John, Jisha; Kumar, Bindey; George, Nibu A.; Kurian, Achamma

doi:10.1016/j.matpr.2015.06.028

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…In this case, the heat storage properties increase and the increase in the heat capacity of the system predominates. This behavior was found in [39] and can be explained as follows: with an increase the average particle size, the total surface area decreases, and with it, the solid/liquid base interface area decreases, which leads to a decrease in interfacial thermal resistance and an increase in thermal conductivity of the nanofluid [7,40]. An increase in D was observed not only with the addition of small amounts (μg and mg) of NPs to pure solvents (water, ethanol, and ethylene glycol) [26,37], but also with an increase in the nanophase concentration.…”

Section: Ludoxsupporting

confidence: 53%

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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Section: Ludoxsupporting

confidence: 53%

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

Khabibullin¹,

Usoltseva²,

Mikheev³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…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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“…In this case, the heat storage properties increase and the increase in the heat capacity of the system predominates. This behavior was found in [ 39 ] and can be explained as follows: with an increase in the average particle size, the total surface area decreases, and, with it, the solid/liquid base interface area decreases, which leads to a decrease in the interfacial thermal resistance and an increase in the thermal conductivity of the nanofluid [ 7 , 40 ]. An increase in D was observed not only with the addition of small amounts (µg and mg) of NPs to pure solvents (water, ethanol, and ethylene glycol) [ 26 , 37 ], but also with an increase in the nanophase concentration.…”

Section: Resultsmentioning

confidence: 77%

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

et al. 2023

View full text Add to dashboard Cite

The growing interest in heat-conducting nanofluids requires highly sensitive methods for analyzing the thermal properties. Thermal lens spectrometry (TLS), despite its advantages over classical methods, does not have a general approach for measuring and interpreting results for dispersed systems. In this paper, for 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 the measurements of thermal diffusivity by TLS under stationary states 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 concentrations, the thermal diffusivity passes through a minimum threshold. Silicon oxide dispersions can be used both as coolants or as heat-removing liquids by selecting the particle size and concentration.

show abstract

Thermal Diffusivity of Gold Nanoparticle Reduced by Polyvinyl Alcohol Using Dual Beam Thermal Lens Technique

Cited by 3 publications

References 9 publications

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

Thermal Diffusivity of Aqueous Dispersions of Silicon Oxide Nanoparticles 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

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