Ultraviolet spectroscopy

. In this research, we present the DOAS system using the Ce:LiCAF laser for determining SO2 gas concentration in the atmosphere. The Ce:LiCAF laser has a full width at half maximum of 2 nm with a wavelength range from 286 to 291 nm and a peak wavelength of 288.5 nm. The results show that the DOAS system accurately determines the gas concentration with a measurement error of 6%. This result can serve as the basis for developing practical DOAS systems with the ability to monitor a wide range of gasses and survey many other types of pollutants.

8p dianmotminh02 03-05-2024 2 1   Download

In this study, the gold nanoparticles (AuNPs) were synthesized via redox reaction, by using ethylene diamine tetra-acetic acid (EDTA) as a protecting and reducing agent, with tetrachloroauric acid (HAuCl4) as precursor and seed solution. The ultraviolet-visible spectroscopy (UV-Vis) method was utilized to investigated the reaction conditions (the EDTA:HAuCl4 ratio, the amount of seed solution and stirring solution time) at room temperature. The synthesized AuNPs were deposited on the surface of fluorine doped tin oxide (FTO) by electrophoresis deposition.

8p dianmotminh02 03-05-2024 6 1   Download

Ebook "Modelling the dissociation dynamics and threshold photoelectron spectra of small halogenated molecules" outlines two related experimental techniques, threshold photoelectron spectroscopy and threshold photoelectron photoion coincidence techniques, which are utilised to investigate small halogenated molecules. All the experiments were conducted at the vacuum ultraviolet beamline of the Swiss Light Source, a synchrotron photon source, which has the advantage over popular laser photon-sources of extreme ease of tunability.

184p tudohanhtau1006 29-03-2024 2 1   Download

Ebook "Far- and deep-ultraviolet spectroscopy" is the first comprehensive work to be published on far-ultraviolet (FUV) and deep-ultraviolet (DUV) spectroscopy, subjects of keen interest because new areas of spectroscopy have been born in the FUV and DUV regions. For example, FUV spectroscopy in condensed matter has become possible due to the development of attenuated total reflection/FUV spectroscopy.

181p tudohanhtau1006 29-03-2024 4 1   Download

Ebook "Ultraviolet and X-ray spectroscopy of the solar atmosphere" give us information about temperatures, densities, flow velocities, filling factors (indicating to what extent features are being spatially resolved), thermal structure, element abundances, ionization state of solar plasmas in the outer parts of the solar atmosphere: the chromosphere, the corona and the enigmatic transition region. They also allow insight into all phenomena in the solar atmosphere, e.g. flares, jets, and prominences.

390p duongthandue0501 28-02-2024 1 1   Download

In this work, collagen extracted from fresh-water fish scales has been used as a matrix in the drug delivery polymeric system. Allopurinol has been applied to reduce the concentration of uric acid in blood and used as a model drug in collagen drug delivery system. The functional groups in collagen/allopurinol biocomposite as well as the morphology of this material were assessed by infrared (IR) spectroscopy and scanning electron microscopy (SEM).

9p giangnhanly 02-10-2023 4 3   Download

In recent years, the study on the growth and characterization of Tutton's salts has drawn considerable attention due to their potential applications in the area of solar energy absorber, chemical energy storage, ultraviolet (UV) light filters and even in missile approach warning systems.

6p viberbers 09-08-2023 8 3   Download

In this study, Zinc oxide nanoparticles (ZnO NPs) were green synthesized using Piper chaudocanum L. (PC) leaf extract by sol-gel method and used as an adsorbent for the removal of Pb (II) ions from aqueous solution. The synthesized ZnO NPs were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), Ultraviolet - visible spectroscopy (UV-Vis) and Brunauer - Emmet - Teller (BET).

9p viberkshire 09-08-2023 5 5   Download

Continued part 1, part 2 of ebook "Clarke’s analytical forensic toxicology" presents the following content: alcohol, drugs and driving; forensic chemistry and solid dosage form identification; colour tests and thin-layer chromatography; immunoassays; ultraviolet, visible and fluorescence spectrophotometry; infrared spectroscopy; raman spectroscopy; gas chromatography; high-performance liquid chromatography;...

350p dieptieuung 14-07-2023 4 1   Download

In this work, the Prussian blue/g-C3N4 (PB/g-C3N4) composite was synthesized from Prussian blue and g-C3N4 via a simple method. The composite was characterized by using X-ray diffraction, Fourier-transform infrared spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy.

7p vispiderman 15-06-2023 6 2   Download

In the study, the nanostructured V2O5 photocatalyst was prepared by a hydrothermal process followed by calcination with the addition of various surfactants to the precursor solution. The synthesized V2O5 nanomaterials were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), and ultraviolet - visible spectroscopy (UV-vis).

7p vihawkeye 26-05-2023 13 4   Download

This paper reports effects of ultraviolet (UV) light radiation on the physicochemical, electrical and mechanical properties of low-density polyethylene (LDPE) cable insulating materials. Changes in structural and morphological properties of UV-aged samples were characterized by various analytical methods such as attenuated total reflection Fourier transform infrared spectroscopy (ATRFTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM).

12p lyhuyenthu 31-01-2023 7 2   Download

Highly crosslinked, inorganic-organic hybrid and intrinsically fluorescent polyphosphazene nanospheres bearing hydroxyl groups on the surface are facilely generated via a one-pot polycondensation of octachlorocyclotetraphosphazene, fluorescein and quercetin. The resulting nanospheres were characterised by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), X-ray diffraction analysis (XRD) and ultravioletvisible spectroscopy (UV-vis) techniques.

13p lyhuyenthu 31-01-2023 6 2   Download

This study aims to synthesize and characterize Fe3O4@SiO2 sub-nanoparticles (SNPs) with high saturation magnetization (SM). The research process was conducted in simple and environmentally friendly conditions. The results of ultraviolet-visible (UV-Vis) spectroscopy and X-ray diffraction (XRD) analysis presented that the Fe3O4@SiO2 SNPs were well formed and the phase change of Fe3O4 NPs did not happen in Fe3O4@SiO2 SNPs.

5p vichristinelagarde 04-07-2022 7 1   Download

This complex is the product of the reaction between succinic anhydride (SA) and 3-aminopropyltriethoxysilane (APTES). The fabricated Fe3O4- COOH nanoparticles have superparamagnetic properties with high technical saturation magnetization (~22 emu/g), and the concentration of carboxyl functional groups on the surface of Fe3O4 nanoparticles has been quantified based on the method using methylene blue indicator (MB) through ultraviolet-visible absorption spectroscopy (UV-vis).

12p viplato 05-04-2022 13 1   Download

In this study, toxic effects caused by the degradation of fluoxastrobin, which is a commonly used fungicide where newly synthesized manganese or sulfur-doped TiO2 nanoparticles exist were evaluated. The characterization study of nanoparticles was performed by scanning an electron microscopy (SEM), X-ray diffractometry, Brunau–Emmet–Teller analysis, X-ray fluorescence spectroscopy, and UV–Vis (ultraviolet–visible) reflectance spectra.

14p dolomite36 30-12-2021 10 1   Download

These mononuclear Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) complexes of the ligand were prepared and their structures were proposed by elemental analysis, and infrared and ultraviolet-visible spectroscopy; the proton NMR spectrum of the mbH ligand was also recorded. The azo-azomethine ligand, mbH, behaves as a bidentate ligand coordinating through the nitrogen atom of the azomethine (–CH=N–) and the oxygen atom of the phenolic group. Elemental analyses indicated that the metal:ligand ratio was 1:2 in the metal chelates.

20p langthannam 29-12-2021 7 0   Download

A novel green approach for the synthesis of silver nanoparticles using erythromycin as a reducing/capping agent is presented. Erythromycin-derived silver nanoparticles were characterized by ultraviolet-visible spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy, X-ray powder diffraction, and Fourier transform infrared spectroscopy. Monodispersed silver nanoparticles showed excellent and promising catalytic activity for reduction of 3 differently charged dyes (eosin B, methylene blue, and rose bengal) in the presence of NaBH4.

10p langthannam 29-12-2021 14 0   Download

In this study, the stable silver nanoparticles (AgNPs) were synthesized by reducing silver nitrate (AgNO3) using trisodium citrate (TSC). The product was characterized by Ultraviolet-Visible spectroscopy, Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD).

7p meyerowitz 25-12-2021 10 0   Download

Chemical Analysis: Modern instrumentation methods (Second Edition) - Part 1 present the content: general aspects of chromatography, gas chromatography, high-performance liquid chromatography, ion chromatography, thin layer chromatography, supercritical fluid chromatography, size exclusion chromatography, capillary electrophoresis and electrochromatography, ultraviolet and visible absorption spectroscopy,...

320p bachkhinhdaluu 03-12-2021 14 1   Download