Repozitorij Univerze v Novi Gorici

Iskanje po repozitoriju
A+ | A- | Pomoč | SLO | ENG

Iskalni niz: išči po
išči po
išči po
išči po
* po starem in bolonjskem študiju


1 - 10 / 68
Na začetekNa prejšnjo stran1234567Na naslednjo stranNa konec
Thermal lens technique : a novel tool for the detection and quantification of microplastics in water
P. Anju Abraham, Mohanachandran Nair Sindhu Swapna, Sankaranarayana Iyer Sankararaman, 2023, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: thermal lens, microplastics
Objavljeno v RUNG: 09.01.2024; Ogledov: 696; Prenosov: 2
URL Povezava na datoteko
Gradivo ima več datotek! Več...

Eco-conscious nanofluids : exploring heat transfer performance with graphitic carbon nitride nanoparticles
Vijayakumar Gokul, Mohanachandran Nair Sindhu Swapna, Sankaranarayana Iyer Sankararaman, 2023, izvirni znanstveni članek

Opis: Abstract The work explores the heat transfer capabilities of semiconducting graphitic carbon nitride (g-C3N4) nanofluids. Also, it presents a sustainable and eco-friendly method for synthesizing g-C3N4 nanoparticles using commercially available rice flour as a natural carbon precursor through hydrothermal treatment. The synthesized sample subjected to various characterizations, including analysis of their structure, morphology, thermal properties, and optical properties. The optical bandgap (2.66 eV) is deduced through Tauc plot analysis and reveals the semiconducting nature of the sample. The formation of g-C3N4 is confirmed by various spectroscopic techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), and Raman spectroscopy. Thermogravimetric analysis (TGA) demonstrates the nanoparticles’ excellent thermal stability up to 550 °C, indicating potential applications in heat transfer fluids. The investigation of concentration-dependent thermal diffusivity variation using the sensitive mode mismatched dual beam thermal lens technique highlights the potential of g-C3N4 semiconductor nanofluid as an organic and metal-free additive in industry-demanding coolant applications.
Ključne besede: thermal lens, nanofluids
Objavljeno v RUNG: 05.01.2024; Ogledov: 738; Prenosov: 4
URL Povezava na datoteko
Gradivo ima več datotek! Več...

Photothermal techniques in environmental analysis
Dorota Korte, druga izvedena dela

Ključne besede: photothermal measurements, thermal lens spectrometry
Objavljeno v RUNG: 21.04.2023; Ogledov: 1137; Prenosov: 0
Gradivo ima več datotek! Več...

Accuracy of measurements of thermophysical parameters by dual-beam thermal-lens spectrometry
Vladislav 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: 1408; Prenosov: 13
.pdf Celotno besedilo (9,88 MB)
Gradivo ima več datotek! Več...

Recent progress and applications of thermal lens spectrometry and photothermal beam deflection techniques in environmental sensing
Mladen 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: 1544; Prenosov: 24
.pdf Celotno besedilo (2,90 MB)
Gradivo ima več datotek! Več...

Iskanje izvedeno v 0.06 sek.
Na vrh