Search results for "FTIR"
showing 10 items of 146 documents
The role of metal ions in the thermal aggregation of Bovine Serum Albumin
2009
Investigation of modern oil paints through a physico-chemical integrated approach. Emblematic cases from Valencia, Spain
2020
Abstract The study and the characterisation of modern and contemporary oil paintings is still a challenging issue, in particular considering the significant changes in paint production across the 19th and 20th centuries. This paper presents the results of the first physico-chemical integrated study of the artistic materials used in six paintings from the School of Art and Higher Design of Valencia (Escola d'Art i Superior de Disseny, EASD-Valencia), artworks created between 1871 and 1943 by four famous Valencian artists: Salustiano Asenso Arozarena, Salvador Abril I Blasco, Enrique Navas Escuriet and Jose Bellver Delmas. A wide range of inorganic and organic compounds was identified through…
Sistemātisks mikroplastmasas monitorings saldūdens ekosistēmā mikroplastmasas piesārņojuma un tā sezonālās dinamikas izvērtēšanai
2020
Darbā veikta ar mikroplastmasu saistītās literatūras izskatīšana, pievēršot lielāku uzmanību pētījumiem par mikroplastmasu saldūdens sistēmās. Tika veikta sezonāla Mazā Baltezera mikroplastmasas piesārņojuma noteikšana, periodiski palageāli ievācot paraugus. Veikta paraugu attīrīšanu no piemaisījumiem. Mikroplastmasas noteikšana tika veikta ar FTIR-ATR metodi. Izvirzītā hipotēze – sezonalitātei ir būtiska ietekme uz konstatēto mikroplastmasas daudzumu un polimēru veidu.
Volframa pārklājumu termiska modificēšana detektēšanai ar infrasarkanās spektrometrijas metodi
2022
Volframa pārklājumu termiska modificēšana detektēšanai ar infrasarkanās spektrometrijas metodi. Goldmane A. E., zinātniskā vadītāja, pētniece, Avotiņa L. Bakalaura darbs, 36 lpp, 15 attēli, 4 tabulas, 56 literatūras avoti, 6 pielikumi. Latviešu valodā. Pusvadītāju tehnoloģijas mūsdienās lieto dažāda veida elektronikai. Materiālu atbilstību parametriem nosaka ražošanas gaitā – nepieciešams izstrādāt metodoloģiju to izvērtēšanai. Darbā veikta uz silīcija (Si) – silīcija dioksīda (SiO2) pamatnes sintezēta volframa (W) pārklājumu termiska modificēšana un izpēte ar FTIR, XRD, SEM-EDS metodi. Modificētu pārklājumu spektros ir papildus signāli 700-900 cm-1, kas attiecināmi uz W-skābekļa saitēm; kr…
Infrared based saliva screening test for COVID‐19
2021
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has resulted in an unprecedented need for diagnostic testing that is critical in controlling the spread of COVID-19. We propose a portable infrared spectrometer with purpose-built transflection accessory for rapid point-of-care detection of COVID-19 markers in saliva. Initially, purified virion particles were characterized with Raman spectroscopy, synchrotron infrared (IR) and AFM-IR. A data set comprising 171 transflection infrared spectra from 29 subjects testing positive for SARS-CoV-2 by RT-qPCR and 28 testing negative, was modeled using Monte Carlo Double Cross Validation with 50 randomized test and model sets. The testing se…
Home-prepared anatase, rutile, and brookite TiO2 catalysts for selective photocatalytic oxidation of p-methoxybenzyl alcohol in water: reactivity and…
2008
SCIENTIFIC INVESTIGATIONS FOR THE RESTORATION OF SANTA CHIARA FROM THE SANTA CATERINA D’ALESSANDRIA MONASTERY IN PALERMO, ITALY
2022
The aim of this research was to assess the techniques and the materials used to realize the canvas painting Santa Chiara, from the Santa Caterina d’Alessandria Monastery and to verify the state of preservation, the possible decay processes and previous restorations. Consequently, an integrated analytical approach based on the use of non-invasive (diffused, indirect and ultraviolet light investigations) and micro-invasive techniques (optical microscopy, OM, scanning electron microscopy, SEM-EDX, Fourier- transform infrared spectroscopy FT-IR spectroscopy) were used. The oil painting on canvas dated XVI century: data suggests traditional painting technique, characterized by two priming prepar…
Metallic Ions Effects on the Heat-aggregation Process of b-Lactoglobulin
2007
Caratterizzazione delle vernici utilizzate nella liuteria storica
2009
Photocatalytic oxidation of aromatic alcohols to aldehydes in aqueous suspension of home prepared titanium dioxide: 2. Intrinsic and surface features…
2008
Some intrinsic electronic properties of home prepared (HP) TiO2 catalysts were investigated by diffuse reflectance spectroscopy and quasi-Fermi level measurements. These powders were used for carrying out the photocatalytic oxidation of benzyl alcohol to benzaldehyde and CO2 in water; the selectivity for aldehyde formation was enhanced by the addition of small amounts of ethanol, a typical hole trap. The values of band gap, valence band and conduction band edges are almost identical for all the HP samples in which anatase phase is predominant, whereas appreciable differences can be noticed for an HP sample containing high amount of rutile phase. A comparative ATR-FTIR study of the HP cataly…