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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"UV/vis absorption"”.
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New techniques and devices for UV-Vis absorption spectroelectrochemistry
… lleva por título “New Techniques and devices for UV-Vis Absorption Spectroelectrochemistry” ha sido realizada en el área de Química Analítica de la Universidad de Burgos y dirigida por los doctores Álvaro Colina Santamaría y Mª Aránzazu Heras Vidaurre. En este trabajo se han desarrollado nuevas …
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ΦΑΣΜΑΤΟΣΚΟΠΙΚΗ ΜΕΛΕΤΗ ΑΕΡΙΩΝ ΣΥΜΠΛΟΚΩΝ ΣΕ ΥΨΗΛΕΣ ΘΕΡΜΟΚΡΑΣΙΕΣ ΣΕ ΣΥΣΤΗΜΑΤΑ ΧΛΩΡΙΟΥΧΩΝ ΑΛΑΤΩΝ ΤΩΝ ΣΙΔΗΡΟΥ, ΧΡΥΣΟΥ ΚΑΙ ΑΛΟΥΜΙΝΙΟΥ
RAMAN SPECTROSCOPY AND UV-VIS ABSORPTION SPECTROPHOTOMETRY HAVE BEEN USED IN ORDER TO STUDY TWO COLORED VAPORS SYSTEMS, THOSE OF IRON (III) CHLORIDE-ALUMINUM CHLORIDE AND GOLD (III) CHLORIDE- ALUMINUM CHLORIDE. IN BOTH SYSTEMS, COMPLEX MOLECULES ARE FORMED IN THE VAPOR PHASE. THE TECHNIC OF HIGH …
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Aggregation of Squaraine Dye Derivatives in Solid State Spin-coated Thin Films
… as models to study aggregation behavior. Their UV-vis absorption, thermal properties, and photoluminescence properties were determined. The models with four hydroxy substituents exhibited higher thermal stability and melt at higher temperature compared to the dye with only two hydroxy …
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Interactions of cadmium selenide (CdSe) quantum dots with coagulant proteins extracted from Moringa oleifera seeds
… QDs and MOCP was studied using the Ultraviolet (UV)-vis absorption spectroscopy, fluorescence (FL) emission spectroscopy and the Fourier Transform Infrared spectroscopy (FTIR). The UV-vis absorption spectrum showed an absorption band of CdSe and MOCP at 546.5 nm, with an increase in concentration …
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Synthesis and Characterization of Magnetic II-VI Nanoparticles
… electron microscope (TEM) imaging and UV-Vis absorption spectroscopy. Spin-carrier relaxation times were determined using a superconducting quantum interference device (SQUID) magnetometer.
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A Deuterium Labeling Method for the Characterization of (Chromophoric) Dissolved Organic Matter Using Ultrahigh Resolution Electrospray Ionization Mass Spectrometry
… to contribute substantially to the ultraviolet/visible (UV-vis) absorption and emission of chromophoric DOM. In this method, an aqueous sample is treated with sodium borodeuteride (NaBD4) and is analyzed via ultrahigh resolution electrospray ionization (ESI) mass spectrometry. …
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Synthesis and characterization of cadmium selenide and zinc selenide nanoparticles
… confirmed by using different techniques such as UV-Vis absorption spectroscopy, photoluminescence spectroscopy (PL), X-ray diffraction (XRD), transmission electron microscopy (TEM) and infrared spectroscopy (FT-IR).
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Near-Infrared High Efficiency Organic Dye Sensitized Solar Cells (DSCs) and Biological Fluorescent Imaging Dyes
… and second, as a way to manipulate the UV-vis absorption and emission of the near-infrared organic dyes to use lower energy photons with wavelength ranges in the therapeutic window (700 nm-1000 nm).
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Colloidal Cerium Oxide Nanoparticle: Synthesis and Characterization Techniques
Fluorescence spectra and UV-Vis absorption spectra are collected on cerium oxide nanocrystalline particles. While CeO2 is the stable form of bulk cerium oxide, ceria nanoparticles exhibit a nonstoichiometric composition, CeO2-γ, due to the presence of oxygen vacancies and the formation of Ce2O3 at …
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Novel absorption detection techniques for capillary electrophoresis
… raises a big challenge to detection methods. For UV-vis absorption detection, the concentration sensitivity is only at the [mu]M level. Most commercial CE instruments are equipped with incoherent UV-vis lamps. Low-brightness, instability and inefficient coupling of the light source with the …
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Surface Relief Grating on Thin Film Containing Azobenzene-Polymer Material Linked by Hydrogen-Bonding
… bond to form SRG on azo-polymer thin films. The UV-VIS absorption spectra of the azo-polymer film showed broad band extending from 400-700 nm with maximum occurring at 430-580 nm. The laser’s wavelength was selected within the absorption band. Azo-polymer thin film was irradiated with a 532 nm …
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EFFECT OF WATERCRESS EXTRACT AND KAEMPFEROL AGAINST OXIDATIVESTRESS
… techniques including circular dichroism (CD), UV-Vis absorption, and steady-state fluorescence spectroscopy and dynamic light scattering, were employed to evaluate structural and conformational changes in HSA. HPLC analysis confirmed the presence of derivatives of kaempferol in the watercress …
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Synthesis and charaterisation of phosphorescent copper (I) complexes for light emitting devices
… by with a range of techniques, such as UV/Vis absorption and emission spectroscopy, nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), cyclic voltammetry (CV) and scanning electron microscopy (SEM). Most of the copper complexes …
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Fabrication of smart glass electrochromic device using rf magnetron sputtering
… were characterized by a cyclic voltammogram and UV-Vis absorption spectra. The results show that nanocrystalline film with particle size of 51.54nm was deposited at 27% oxygen flow rate has the largest charge capacity and coloration efficiency among the others. The time respond taken for complete …
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Solvophobically-Driven Folding of Non-Biological Oligomers and the Solid Phase Synthesis of Phenylacetylene Oligomers
… parallel fashion. Chain length dependence of UV/Vis and $\sp1$H NMR spectra provide strong evidence of the ordering of monomers and intramolecular aromatic stacking which is consistent with the formation of helical structures. Using UV/Vis absorption at 303 nm as an indication of helical …
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Cyclometalated Platinum β-Diketiminate Complexes
… the same substitution minimally perturbed the UV-Vis absorption spectra of the complexes.
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The behavior of Fe3+ coordination in alginate-catechol networks
… the metal-coordination in the Alg-C network, UV-vis absorption measurements provided less certain data. Nonetheless, this study shows that metal-coordination is highly dependent on the polymer backbone, but may still be used in a variety of polymer networks.
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Síntesis de nanoestruturas metálicas de oro y plata a partir de precursores organometálicos: Propiedades plasmónicas y catalíticas
… of formation of the nanostructures through UV-Vis absorption spectroscopy and nuclear magnetic resonance, which has allowed us to know mechanism and the molecular species involved in the formation of these bimetallic nanostructures. In the third chapter the synthesis of bimetallic core-shell …
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FROM SYNTHESIS TO APPLICATION:PORPHYRINS AS VERSATILE COMPOUNDS IN ENERGY, SENSING, AND CATALYSIS
… from red to green, originates from robust absorption within the visible spectrum. UV-VIS absorption spectroscopy plays a crucial role in examining their light-harvesting properties. When coupled with electrochemical methods and theoretical calculations, it provides insights into the …
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Synthesis, Characterisation and Functionalisation of CdSe Quantum Dots
… A significant red- shift of both the broad absorption and narrow emission spectra of the QDs was observed upon attachment to graphene, as determined by UV-vis absorption and photoluminescence spectroscopy, whilst HRTEM data clearly shows the successful decoration of CdSe QDs on the graphene …
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