Dependence of thermal diffusivity on nanoparticle shape deduced through thermal lens technique taking ZnO nanoparticles and nanorods as inclusions in homogeneous dye solution

Francis, Frincy; Anila, E.I.; Joseph, Santhi Ani

doi:10.1016/j.ijleo.2020.165210

Cited by 11 publications

(5 citation statements)

References 21 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%

“…In the practice of thermal-lens measurements, the issues of trueness are given less attention, and the available results are non-systemic [ 63 , 64 ]. In applied research, the main emphasis is on the precision of the results, improperly considering this as the only factor that governs the accuracy [ 50 , 53 , 65 ]. Some aspects of the trueness of thermal-lens measurements are considered in the context of optimizing methods for a particular analyte (and, as a rule, only in relation to the signal amplitude), within which an original setup is designed, and its operation parameters are optimized [ 66 , 67 ].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

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

2023

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“…Photothermal Analysis by Dual Beam Method. Thermal lens spectroscopy was employed to estimate the thermal diffusivity of the synthesized sample as explained in reports [15]. The nanofluids of synthesized samples were prepared in water with a concentration of 1gL -1 .…”

Section: Synthesismentioning

confidence: 99%

Enhanced Thermal Diffusivity and Photocatalytic Dye Degradation Capability of Zinc Ferrite/Silver/Silver Chloride Nanocomposites

Pius¹,

Francis²,

Joseph³

2023

JNanoR

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Herein, we report for the first time the thermal diffusivity of zinc ferrite/ silver/ silver chloride nanocomposite with a four-fold enhancement in comparison with the base fluid. A systematic analysis of the dependence of calcination temperature and synthesis routes on the crystallinity of nanocomposites of zinc ferrite with silver and silver chloride suiting it for diverse applications was done. Synthesized via the co-precipitation method, the samples were characterized using X-ray diffraction, Field emission scanning electron microscopy, Energy dispersive X-ray, Vibration sample magnetometer, ultraviolet-visible Diffusive Reflective spectroscopy and Photoluminescence studies. A zeta potential of -31.1mV was obtained for the sample showing good colloidal stability. The thermal diffusivity of the samples as nanofluids was analyzed using the dual beam thermal lens method. The study also envisages the magnetically retrievable and visible light-active nature of the synthesized samples indicating their suitability for photocatalytic degradation of toxic dyes. The work on photocatalytic degradation of methylene blue stands out in attaining rapid, efficient dye degradation of 98% within 90 minutes of sunlight exposure in comparison with unblended zinc ferrite nanoparticles even without any oxidizing agent.

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“…The mixture was then centrifuged at 3000 rpm for 30 minutes and the supernatant was removed and the precipitate was cooled to room temperature for 2−4 hours and then washed several times to remove the organic impurities and other unreacted compounds. Later, the precipitate was ground using an agate mortar and pestle for making nanoparticles [8].…”

Section: Preparation Techniquementioning

confidence: 99%

Amplified spontaneous emission from ZnO nanostructures as scatterers in rhodamine 6G

Devika¹,

Joby²,

Francis³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Under high power, Nd: YAG 532nm, ns pulsed laser spectral narrowing of an amplified spontaneous emission (ASE) from ZnO nanostructures in rhodamine 6G has been studied. The dependence of emission intensity on excitation power, particle density of ZnO nanostructures, and silica as scatterers show a distinct threshold. The Full width half maximum (FWHM) substantially reduces from 46 nm to 3.16 nm at high excitation power and ZnO-silica scatterer inclusion.

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Dependence of thermal diffusivity on nanoparticle shape deduced through thermal lens technique taking ZnO nanoparticles and nanorods as inclusions in homogeneous dye solution

Cited by 11 publications

References 21 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

Enhanced Thermal Diffusivity and Photocatalytic Dye Degradation Capability of Zinc Ferrite/Silver/Silver Chloride Nanocomposites

Amplified spontaneous emission from ZnO nanostructures as scatterers in rhodamine 6G

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