31. Optimization of DGT technique for determination of iron species in natural water and sediments by photothermal beam deflection spectroscopyMladen Franko, Dorota Korte, Arne Bratkič, Hanna Budasheva, 2018, objavljeni povzetek znanstvenega prispevka na konferenci Najdeno v: ključnih besedah
Ključne besede: beam deflection spectroscopy, diffusive gradients in thin-film technique, iron redox species, photothermal techniques, natural water, sediments
Objavljeno: 23.11.2018; Ogledov: 2908; Prenosov: 0
 Polno besedilo (386,02 KB) |
32. Growth, morphology and stability of Au in contact with the Bi[sub]2Se[sub]3(0 0 0 1) surfaceMattia Fanetti, Iuliia Mikulska, Katja Ferfolja, Paolo Moras, P. M. Sheverdyaeva, M. Panighel, A. Lodi-Rizzini, I. Píš, S. Nappini, Matjaž Valant, Sandra Gardonio, 2018, izvirni znanstveni članek Najdeno v: ključnih besedah
Povzetek najdenega: ...growth mode, electronic properties, chemical properties, photoemission spectroscopy, microscopy...
Ključne besede: metal contact, topological insulator contact, growth mode, electronic properties, chemical properties, photoemission spectroscopy, microscopy
Objavljeno: 05.12.2018; Ogledov: 2782; Prenosov: 0
Polno besedilo (8,13 MB) |
33. First principles vibrational spectra of tetrahedrally-bonded glasses: sio2, geo2 and gese2Luigi Giacomazzi, 2007, doktorska disertacija Najdeno v: ključnih besedah
Povzetek najdenega: ...Silica, Germania, Chalcogenide Glasses, Vibrational Spectra, Raman Spectroscopy, Infrared, First-principles,...
Ključne besede: Silica, Germania, Chalcogenide Glasses, Vibrational Spectra, Raman Spectroscopy, Infrared, First-principles
Objavljeno: 31.01.2019; Ogledov: 3345; Prenosov: 0
Polno besedilo (2,03 MB) |
34. Determination of Dissolved Iron Redox Species in Freshwater Sediment using DGT Technique Coupled to BDSYue Gao, Arne Bratkič, Dorota Korte, Aleksander Kravos, Hanna Budasheva, Mladen Franko, 2019, izvirni znanstveni članek Opis: In this work we have developed a novel method for determination of iron redox species by the use of diffusive gradients in thin-film (DGT) technique coupled to photothermal beam deflection spectroscopy (BDS). The combination of both methods achieved low limit of detection (LOD) of 0.14 μM for Fe (II) ions. The total Fe concentration determined in the Vrtojbica river sediment (Slovenia, Rožna Dolina, 5000 Nova Gorica) was 49.3 μgL–1. The Fe (II) and Fe (III) concentra- tion amounted to 12.8 μgL–1 and 39.9 μgL–1, respectively. Such an approach opens new opportunities for monitoring the content of iron species in natural waters and sediments and provides highly sensitive chemical analysis and an accurate qualitative and quantitative characteristic of the materials under study.
Najdeno v: ključnih besedah
Povzetek najdenega: ...(DGT) technique coupled to photothermal beam deflection spectroscopy (BDS). The combination of both methods achieved...
Ključne besede: Beam deflection spectroscopy, diffusive gradients in thin-film technique, iron redox species, photothermal techniques, sediment
Objavljeno: 26.02.2019; Ogledov: 2854; Prenosov: 106
Polno besedilo (452,58 KB) |
35. Photothermal lens technique: a comparison between conventional and self-mixing schemesJohn Fredy Barrera Ramírez, Dorota Korte, Jose Juan Suárez-Vargas, Jehan Akbar, Evelio E. Ramírez-Miquet, Fatima Matroodi, Imrana Ashraf, Humberto Cabrera, Hanna Budasheva, Joseph J. Niemela, 2019, izvirni znanstveni članek Opis: This work focuses on assessing the analytical capabilities of a new photothermal lens method based on the self-mixing effect to reliably measure metallic traces in water-ethanol solutions. We compare it with the conventional thermal lens scheme, considering the low detection limit and versatility. A theoretical model is presented to describe the laser power variations as a function of the photothermal parameters of the analyzed sample. The experimental results demonstrate that the laser intensity variations, induced by the external optical feedback, are governed by
the photothermal lens effect. Measurements of Fe(II)-1,10-phenanthroline in water–ethanol solutions show a favourable correspondence and agreement with the theory. The low detection limits obtained by the two analytic techniques also agree very well. Nevertheless, our instrument presents advantages regarding compactness and simplicity, suggesting that this platform could be potentially useful as a robust analytical tool for metallic trace detection. In addition, calibration of the method is performed by measuring the so-called self-mixing constant.
Najdeno v: ključnih besedah
Povzetek najdenega: ...thermal lens, photothermal spectroscopy, self-mixing effect, trace detection...
Ključne besede: thermal lens, photothermal spectroscopy, self-mixing effect, trace detection
Objavljeno: 05.04.2019; Ogledov: 2573; Prenosov: 0
Polno besedilo (715,09 KB) |
36. Trace detection of C2H2 in ambient air using continuous wave cavity ring-down spectroscopy combined with sample pre-concentrationOrr-Ewing Andrew, Damien Martin, Iain White, Roberto Grilli, Ruth Lindley, Manik Pradhan, 2008, izvirni znanstveni članek Opis: Continuous wave cavity ring-down spectroscopy (cw-CRDS) coupled with sample pre-concentration has been used to measure acetylene (C2H2) mixing ratios in ambient air. Measurements were made in the near-infrared region (λ∼1535.393 nm), using the P(17) rotational line of the (ν1+ν3) vibrational combination band, a region free from interference by overlapping spectral absorption features of other air constituents. The spectrometer is shown to be capable of fast, quantitative and precise C2H2 mixing ratio determinations without the need for gas chromatographic (GC) separation. The current detection limit of the spectrometer following sample pre-concentration is estimated to be 35 parts per trillion by volume (pptv), which is sufficient for direct atmospheric detection of C2H2 at concentrations typical of both urban and rural environments. The CRDS apparatus performance was compared with an instrument using GC separation and flame ionization detection (GC-FID); both techniques were used to analyze air samples collected within and outside the laboratory. These measurements were shown to be in quantitative agreement. The indoor air sample was found to contain C2H2 at a mixing ratio of 3.87±0.22 ppbv (3.90±0.23 ppbv by GC-FID), and the C2H2 fractions in the outside air samples collected on two separate days from urban locations were 1.83±0.20 and 0.69±0.14 ppbv (1.18±0.09 and 0.60±0.04 ppbv by GC-FID). The discrepancy in the first outdoor air sample is attributed to degradation over a 2-month interval between the cw-CRDS and GC-FID analyses.
Najdeno v: ključnih besedah
Ključne besede: Rotational Line, Cavity Enhance Absorption Spectroscopy, Adsorbent Trap, Trace Atmospheric Constituent, CRDS Instrument
Objavljeno: 15.07.2019; Ogledov: 2460; Prenosov: 0
Polno besedilo (363,50 KB) |
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38. Nanobody Engineering Provides Diagnostic Reagents For The Quantification Of The Toxic Microalgae Alexandrium minutumRobert Alvin Bernedo-Navarro, Sandra Oloketuyi, Giulio Bernardinelli, Eda Mehmeti, Kurt Kalcher, Ario de Marco, 2019, objavljeni povzetek znanstvenega prispevka na konferenci Najdeno v: ključnih besedah
Povzetek najdenega: ...Nanobodies, DNAzyme, electrochemical impedance spectroscopy, toxic microalgae...
Ključne besede: Nanobodies, DNAzyme, electrochemical impedance spectroscopy, toxic microalgae
Objavljeno: 09.09.2019; Ogledov: 2716; Prenosov: 0
Polno besedilo (3,13 MB) |
39. Determination of Iron in Environmental Water Samples by FIA-TLSMladen Franko, Arne Bratkič, Dorota Korte, Hanna Budasheva, Leja Goljat, Gaja Tomšič, 2019, izvirni znanstveni članek Opis: The determination of low concentration of iron in natural waters can be difficult due to the complexity of natural water, but primarily because it requires preconcentration of the sample with solvent extraction. In this work we report on results of thermal lens spectrometry (TLS) coupled to flow injection analysis (FIA) as a highly sensitive FIA-TLS method of iron detection. The concentration of iron redox species was determined using 1,10-phenanthroline (PHN), that forms stable complexes with Fe(II) ions which are characterized by an absorption maximum at 508 nm. The TLS system using a 633 nm probe laser and 530 nm pump laser beam was exploited for on-line detection in flow injection analysis, where a PHN solution was used as the carrier solution for FIA. The concentration of the complexing agent affects the quality of the TLS signal, and the optimal concentration was found at 1 mM PHN. The achieved limits of detection (LODs) for Fe(II) and total iron were 33 nM for Fe(II) and 21 nM for total iron concentration. The method was further validated by determining the linear concentration range, specificity in terms of analytical yield and by determining concentration of iron in a water sample from a local water stream.
Najdeno v: ključnih besedah
Ključne besede: Flow injection analysis, iron concentration, thermal lens spectroscopy
Objavljeno: 18.12.2019; Ogledov: 2421; Prenosov: 93
Polno besedilo (690,39 KB) |
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