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3. Tuning the dynamic thermal parameters of nanocarbon ionanofluids : a photopyroelectric studyMohanachandran Nair Sindhu Swapna, Carmen Tripon, Alexandra Farcas, Dorin Dadarlat, Dorota Korte, Sankaranarayana Iyer Sankararaman, 2024, izvirni znanstveni članek Opis: The present work delineates the tailoring of the thermal effusivity and diffusivity of the novel class of heat transfer fluids—ionanofluids—by the incorporation of nanocarbons like diesel soot (DS), camphor soot (CS), carbon nanotubes (CN), and graphene (GR). When the thermal diffusivity delivers information on the thermal energy propagation, the thermal effusivity concerns the energy exchange at the interface, enabling energy-efficient thermal system design. The nanocarbons are subjected to morphological characterisation by field emission scanning electron microscopy. Fourier-transform infrared and Raman spectroscopic analyses confirm functional groups and vibrational bands. The microcrystalline size and graphiticity are also understood from the Raman spectrum. Ionanofluids prepared by dispersing nanocarbons into an ionic liquid base 1-Butyl-3-methylimidazolium methyl sulfate (BMMS) are analysed by nondestructive photopyroelectric calorimetry (PPE). The PPE analysis of ionanofluids demonstrates that nanocarbons influence thermal parameters in the base fluid, with soot ionanofluids exhibiting increased thermal effusivity and diffusivity due to their various carbon allotropic composition. This study underscores the importance of selecting the appropriate carbon allotrope for tailoring ionanofluids’ thermal properties, providing insights into manipulating these properties for enhanced performance across various industrial applications. Ključne besede: photopyroelectric, ionanofluid, soot, graphene, thermal diffusivity Objavljeno v RUNG: 06.05.2024; Ogledov: 1124; Prenosov: 10 Celotno besedilo (1,03 MB) Gradivo ima več datotek! Več... |
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6. Measuring thermal diffusivity of azoheteroarene thin layers by photothermal beam deflection and photothermal lens methodsAmeneh Mikaeeli, Dorota Korte, Humberto Cabrera, Dariusz Chomicki, Dariusz Dziczek, Oksana Kharchenko, Peng Song, Junyan Liu, Andreas D. Wieck, Michal Pawlak, 2023, izvirni znanstveni članek Ključne besede: thin films, photothermal spectroscopy, thermal transport, thermal wave, thermal conductivity, thermal diffusivity Objavljeno v RUNG: 21.09.2023; Ogledov: 2125; Prenosov: 6 Celotno besedilo (882,88 KB) Gradivo ima več datotek! Več... |
7. Accuracy of measurements of thermophysical parameters by dual-beam thermal-lens spectrometryVladislav R. Khabibullin, Mladen Franko, Mikhail A. Proskurnin, 2023, izvirni znanstveni članek Opis: 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. Ključne besede: thermal-lens spectrometry, accuracy, trueness, mode-mismatched schematic, measurements of thermal diffusivity Objavljeno v RUNG: 20.01.2023; Ogledov: 2173; Prenosov: 16 Celotno besedilo (9,88 MB) Gradivo ima več datotek! Več... |
8. Reflecting the quality degradation of engine oil by the thermal diffusivity : radiative and nonradiative analysesVijayakumar Gokul, Mohanachandran Nair Sindhu Swapna, Dorota Korte, Sankaranarayana Iyer Sankararaman, 2023, izvirni znanstveni članek Ključne besede: engine oil, thermal diffusivity, thermal lens technique, oil degradation, quality monitoring Objavljeno v RUNG: 12.01.2023; Ogledov: 2074; Prenosov: 23 Celotno besedilo (1,06 MB) Gradivo ima več datotek! Več... |
9. Influence of P3HT:PCBM ratio on thermal and transport properties of bulk heterojunction solar cellsDorota Korte, Egon Pavlica, Domen Klančar, Gvido Bratina, Michal Pawlak, Ewa Gondek, Peng Song, Junyan Liu, Beata Derkowska-Zielińska, 2023, izvirni znanstveni članek Ključne besede: organic bulk-heterojunction solar cells, polymer-fullerene solar cells, photothermal beam deflection spectrometry, non-radiative recombination, thermal diffusivity, frequency domain methods Objavljeno v RUNG: 09.01.2023; Ogledov: 2418; Prenosov: 23 Celotno besedilo (2,58 MB) Gradivo ima več datotek! Več... |
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