1. Characterization of sustainable biocompatible materials based on chitosan : cellulose composites containing sporopollenin exine capsulesDorota Korte, Mohanachandran Nair Sindhu Swapna, Hanna Budasheva, Patricia Cazón, Manisha Chhikara, Tina Škorjanc, Carmen Tripon, Alexandra Farcas, Egon Pavlica, Chieu D. Tran, Mladen Franko, 2024, izvirni znanstveni članek Ključne besede: material characterization, biocompatible materials, chitosan, sporopollenin exine capsules, beam deflection spectrometry
Objavljeno v RUNG: 29.10.2024; Ogledov: 333; Prenosov: 0
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2. 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: 1139; Prenosov: 10
 Celotno besedilo (1,03 MB)
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3. Non-contact and self-calibrated photopyroelectric method for complete thermal characterization of porous materialsMohanachandran Nair Sindhu Swapna, Carmen Tripon, Robert Gutt, Alexandra Farcas, Marcel Bojan, Dorota Korte, Irina Kacso, Mladen Franko, Dorin Dadarlat, 2023, izvirni znanstveni članek Ključne besede: photopyroelectric calorimetry, thermal parameters, porous materials
Objavljeno v RUNG: 04.08.2023; Ogledov: 2185; Prenosov: 5
Celotno besedilo (3,70 MB)
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4. Improved photopyroelectric (PPE) configuration for thermal effusivity investigations of porous solidsCarmen Tripon, Mohanachandran Nair Sindhu Swapna, Nicoleta Cobirzan, Dorota Korte, Robert Gutt, Marcel Bojan, Mladen Franko, Dorin Dadarlat, 2023, izvirni znanstveni članek Ključne besede: photothermal techniques, photopyroelectric calorimetry, thermal effusivity, porous solids, building materials
Objavljeno v RUNG: 12.04.2023; Ogledov: 2409; Prenosov: 30
Celotno besedilo (3,75 MB)
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5. Thermal Effusivity Investigations of Solid Thermoelectrics Using the Front Photopyroelectric DetectionCarmen Tripon, Dorin Dadarlat, Katalin Kovacs, Victor Petru Tosa, Mladen Franko, 2020, izvirni znanstveni članek Opis: The front photopyroelectric configuration (FPPE), making use of air as a coupling
fluid between the sample and sensor, was applied to measure the thermal effusivity of
some solid thermoelectric materials. The investigated samples were ZnO, CuCrO2,
Cu4Sn7S16,
TiS3
and two samples of high manganese silicide (HMS) thermoelectric
materials. Most of these materials are porous and consequently, the classical PPE
method, making use of standard coupling fluids between sensor and sample, cannot
be used due to the fact that the coupling fluid penetrates inside the sample and leads
to incorrect results. With this work we extend (to thermoelectric solids) the area of
application of a method, recently proposed by Salazar et al. (Measurement 121: 96,
2018). Experimentally, the thermal effusivity is obtained from a multi-parametric
fit of the phase of the FPPE signal as a function of the modulation frequency (with
sample’s thermal effusivity, thickness of the sensor-sample air gap and heat losses
by convection and radiation, as fitting parameters). It was demonstrated that, in some
particular cases, the three parameters are independent and consequently, the solution
of the fit is unique. Where possible, the obtained results have been compared with
data from the literature and good agreement was found.
Ključne besede: Front photopyroelectric configuration (FPPE), Solid thermoelectrics, Thermal effusivity
Objavljeno v RUNG: 02.05.2020; Ogledov: 3677; Prenosov: 0
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