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4. 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: 2453; Prenosov: 23
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5. Advantages and disadvantages of photothermal measurement methods estimating thermal transport properties (such as thermal conductivity, diffusivity and boundary resistance) of multilayered samplesAmeneh Mikaeeli, A Chatterjee, Dorota Korte, Humberto Cabrera, Beata Derkowska-Zielinska, Michal Pawlak, 2022, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: thermal properties, Photothermal radiometry, beam deflection spectrometry, thermal lens spectrometry, thermoreflectance
Objavljeno v RUNG: 30.06.2022; Ogledov: 2365; Prenosov: 52
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6. Investigations of the Thermal Parameters of Hybrid Sol–Gel Coatings Using Nondestructive Photothermal TechniquesŁukasz Chrobak, Dorota Korte, Hanna Budasheva, Miroslaw Malinski, Peter Rodič, Ingrid Milošev, Sylwia Janta-Lipińska, 2022, izvirni znanstveni članek Ključne besede: hybrid sol–gel coatings, non-destructive testing, photothermal radiometry, photothermal beam deflection spectrometry, thermal diffusivity, thermal conductivity
Objavljeno v RUNG: 03.06.2022; Ogledov: 2632; Prenosov: 33
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7. Towards a novel method for iron species determination in Antarctic sea iceHanna Budasheva, Arne Bratkič, Dorota Korte, Mladen Franko, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Opis: Sea-ice borne iron has been found to be an important factor controlling Southern Ocean phytoplankton growth [1]. Knowing the amount and chemical speciation of its labile fraction in sea ice would advance our understanding of the involved processes. Unfortunately, it is rather difficult to perform their measurement because of limited access to the Antarctic. Thus there is a strong need for the development of a quick, simple and reliable technique for determination of iron and its speciation in sea-ice that ensures also low enough limits of detection. Recently, diffusive gradients in thin films (DGT) have been widely used as passive samplers for collecting time-averaged data on the concentrations of transition metals in different media [2]. DGTs are further coupled to an analytical technique that in case of detecting metals in passive sampler films primarily requires their extraction [3], which may potentially lead to changes of the metal specification. In the present study, the beam deflection spectrometry (BDS) is coupled to DGT and used to determine the average concentration of iron in the sea ice samples collected at the Davis Station in the Antarctic. Such a combined technique has been already successfully applied for detecting labile iron species in freshwater sediments [4]. The obtained BDS data were validated by thermal lens spectrometry (TLS) and UV-Vis spectrophotometry (SPEC). The distribution of iron species over a given ice surface area using the DGT-BDS technique revealed total iron concentrations in the range of 0.6 – 5.3 μgL-1, whereas the Fe2+ content was found to be in the range of 0.1 – 1.5 μgL-1. The range taking into account all of the measurement points (5×4), the precision of a single measured point is 0.2 μgL-1. The calculated 24 h-average concentration of total Fe labile species in the ice by using BDS is 2.3 ± 0.5 μgL-1, which coincides with data obtained by SPEC (2.5 ± 0.4 μgL-1) and TLS (2.39 ± 0.02 μgL-1). Our results indicate that it is possible to develop a robust, contamination-resilient detection method for measuring the labile iron species concentration in the sea ice. In opposite to TLS and SPEC, BDS-DGT provides reliable information not only about the speciation of iron but also about their distribution on the ice surface.
Ključne besede: beam deflection spectrometry, diffusive gradients, thin films, iron species, photothermal techniques, Antarctic sea ice
Objavljeno v RUNG: 30.11.2021; Ogledov: 3476; Prenosov: 0
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8. Through-plane and in-plane thermal diffusivity determination of graphene nanoplatelets by photothermal beam deflection spectrometryHumberto Cabrera, Dorota Korte, Hanna Budasheva, Behnaz Abbasgholi N. Asbaghi, Stefano Bellucci, 2021, izvirni znanstveni članek Opis: In this work, in-plane and through-plane thermal diffusivities and conductivities of a freestanding
sheet of graphene nanoplatelets are determined using photothermal beam deflection spectrometry.
Two experimental methods were employed in order to observe the effect of load pressures
on the thermal diffusivity and conductivity of the materials. The in-plane thermal diffusivity was
determined by the use of a slope method supported by a new theoretical model, whereas the
through-plane thermal diffusivity was determined by a frequency scan method in which the obtained
data were processed with a specifically developed least-squares data processing algorithm.
On the basis of the determined values, the in-plane and through-plane thermal conductivities and
their dependences on the values of thermal diffusivity were found. The results show a significant
difference in the character of thermal parameter dependence between the two methods. In the case
of the in-plane configuration of the experimental setup, the thermal conductivity decreases with the
increase in thermal diffusivity, whereas with the through-plane variant, the thermal conductivity
increases with an increase in thermal diffusivity for the whole range of the loading pressure used.
This behavior is due to the dependence of heat propagation on changes introduced in the graphene
nano-platelets structure by compression.
Ključne besede: graphene nanoplatelets, thermal diffusivity, thermal conductivity, photothermal spectrometry
Objavljeno v RUNG: 30.11.2021; Ogledov: 2819; Prenosov: 71
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9. Characterization of Cu and Zr modified TiO[sub]2 photocatalysts by photothermal beam deflection spectrometryMahmoud Abdelhamid, Dorota Korte, Humberto Cabrera, Zeinab Ebrahimpour, Olena Pliekhova, Urška Lavrenčič Štangar, Mladen Franko, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: photocatalysts, TiO2, Cu/Zr, photodegradation, material characterization, photothermal spectrometry
Objavljeno v RUNG: 23.11.2021; Ogledov: 3352; Prenosov: 0
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10. Thermo-optical characterization of Cu- and Zr-modified TiO[sub]2 photocatalysts by beam deflection spectrometryMahmoud Abdelhamid, Dorota Korte, Humberto Cabrera, Olena Pliekhova, Zeinab Ebrahimpour, Urška Lavrenčič Štangar, Mladen Franko, 2021, izvirni znanstveni članek Ključne besede: photocatalysts, TiO2, Cu/Zr, photodegradation, material characterization, photothermal spectrometry
Objavljeno v RUNG: 23.11.2021; Ogledov: 2577; Prenosov: 100
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