11. EditorialMladen Franko, Mauro L. Baesso, G. Paltauf, V. Spagnolo, 2023, kratki znanstveni prispevek Opis: This is an Editorial to the special issue of Photoacoustics, which presents a collection of selected papers from the
field of photoacoustics, presented at the ICPPP21 - The 21st International Conference on Photoacoustic and Photothermal Phenomena, which took place in Bled, Slovenia, from 19 to 24 June 2022.
Ključne besede: photoacoustics, ICPPP21
Objavljeno v RUNG: 21.08.2023; Ogledov: 692; Prenosov: 5
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13. 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: 775; Prenosov: 4
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16. Trajnostni biokompozitni materiali iz naravnih polimerov in njihova neporušna karakterizacija z optotermičnimi tehnikamiMladen Franko, druga izvedena dela Opis: Predstavljene so osnove zelene sinteze novih biokompozitnih materialov iz kombinacij celuloze s hitosanom ali keratinom in sporopoleninom ter njihove protimikrobne lastnosti in adsorpcijske sposobnosti za čiščenje vode. Pomembna lastnost biokompozitov z vidika njihove uporabnosti je tudi poroznost, ki jo lahko določamo neporušno in nekontaktno s tehniko optotermičnega odlkona. Ta omogoča določevanje toplotne difuzivnosti materialov ter preko nje poroznosti, kot tudi globinske porazdelitve v material vgrajenih snovi, ki izboljšujejo njegove lastnosti.
Ključne besede: Biokompoziti, celuloza, hitosan, keratin sporopolenin, toplotna difuzivnost, poroznost, optotermična spektrometrija
Objavljeno v RUNG: 11.05.2023; Ogledov: 1255; Prenosov: 0
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17. 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: 1079; Prenosov: 23
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19. 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: 1130; Prenosov: 13
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20. Recent progress and applications of thermal lens spectrometry and photothermal beam deflection techniques in environmental sensingMladen Franko, Leja Goljat, Mingqiang Liu, Hanna Budasheva, Mojca Žorž, Dorota Korte, 2023, izvirni znanstveni članek Opis: This paper presents recent development and applications of thermal lens microscopy (TLM) and beam deflection spectrometry (BDS) for the analysis of water samples and sea ice. Coupling of TLM detection to a microfluidic system for flow injection analysis (µFIA) enables the detection of microcystin-LR in waters with a four samples/min throughput (in triplicate injections) and provides an LOD of 0.08 µg/L which is 12-times lower than the MCL for microcystin-LR in water. µFIA-TLM was also applied for the determination of total Fe and Fe(II) in 3 µL samples of synthetic cloudwater.
The LODs were found to be 100 nM for Fe(II) and 70 nM for total Fe. The application of µFIA-TLM for the determination of ammonium in water resulted in an LOD of 2.3 µM for injection of a 5 µL sample and TLM detection in a 100 µm deep microfluidic channel. For the determination of iron
species in sea ice, the BDS was coupled to a diffusive gradient in the thin film technique (DGT). The 2D distribution of Fe(II) and total Fe on DGT gels provided by the BDS (LOD of 50 nM) reflected the distribution of Fe species in sea ice put in contact with DGT gels.
Ključne besede: thermal lens microscopy, beam deflection spectrometry, microfluidic system, microcystin-LR detection, iron species determination, ammonium detection
Objavljeno v RUNG: 03.01.2023; Ogledov: 1263; Prenosov: 24
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