Search results for " tin"
showing 10 items of 164 documents
Inverted Solution Processable OLEDs Using a Metal Oxide as an Electron Injection Contact.
2007
A new type of bottom-emission electroluminescent device is described in which a metal oxide is used as the electron-injecting contact. The preparation of such a device is simple. It consists of the deposition of a thin layer of a metal oxide on top of an indium tin oxide covered glass substrate, followed by the solution processing of the light-emitting layer and subsequently the deposition of a high-workfunction (air-stable) metal anode. This architecture allows for a low-cost electroluminescent device because no rigorous encapsulation is required. Electroluminescence with a high brightness reaching 5700 cd m–2 is observed at voltages as low as 8 V, demonstrating the potential of this new a…
Electrochromic Performances of Poly(Azure A) Films from Digital Video-Electrochemistry (DVEC)
2020
Poly(Azure A) (PAA) films doped with sodium dodecyl sulfate (SDS) were grown on transparent indium tin oxide (ITO) glass substrates by cyclic voltammetry. The electrochromism of PAA was investigated by digital video-electrochemistry (DVEC). DVEC consists of the acquisition of sequential digital images during the electro-stimulated changes of PAA color. The evolution of red, green, and blue (R, G, B) colors intensity (I) of analyzed pixels provides enough sensitivity to detect changes of some nmol cm−2 of electroactive centers. Besides, the different time evolution of these color intensities can serve to discern among different electroactive centers activated in the polymer. For the first ti…
Electrochemical behaviour of inorganic redox substances dispersed into Nafion® films
1999
Abstract The voltammetric response of a Nafion ® film deposited on an indium tin oxide (ITO) electrode was studied. It was observed that the response is affected by the thickness of the Nafion ® layer. Also, the voltammograms show differences depending on the concentration and composition of the supporting electrolyte solution. The ITO–Nafion ® system can be stabilised by repetitive cyclic voltammetry, and then the inner hydrogen reduction is not detected by electrochemical impedance spectroscopy. Different substances were dispersed into the Nafion ® matrix in order to study their electrochemical response.
Surface modification of graphite+polymer composite and ITO electrodes by Nafion®+cupromeronic phthalocyanine films
1999
Abstract The surface of indium tin oxide (ITO) and graphite+polymer composite electrodes can be modified by Nafion ® films containing a little amount of dispersed electroactive substances, such as phthalocyanines. This procedure allows the recovery of electroanalytical information on the electroactive deposited substance. The preparation methods for these types of modified electrodes are discussed from the voltammetric results obtained in this work. The Nafion ® net acts as a permeable membrane to the hydrogen ions. Furthermore, the presence of methylviologen within the Nafion ® film makes the electron transport throughout this membrane easy.
Study of tin and gold halos in the medieval wall painting depicting Saints Luke the Evangelist and Gregory the Great in Palermo’s San Francesco d’Ass…
2022
Lo scopo di questo studio è quello di fornire un supporto al restauratore quando si trova ad affrontare un manufatto con doratura a foglia di stagno. Lo studio dei materiali originali ha fornito un quadro completo dei vari componenti coinvolti, organici e inorganici, e sono stati delineati i degradi più comuni, nonché i metodi di conservazione per questi materiali estremamente fragili e sensibili come le foglie metalliche The purpose of this study is to provide a support for the restorer when facing an artifact with tin leaf gilding. The study of the original materials gave a complete picture of the various components involved, organic and inorganic, and the most common degradations were ou…
Electrochemical conversion of Carbon Dioxide: effect of operating parameters and of the reactor on the performances of the process.
2017
Phytochemical Evaluation of Tinctures and Essential Oil Obtained from Satureja montana Herb
2020
Winter Savory (Satureja montana L.) has been used in traditional medicine and as a spice or natural food preservative in the Mediterranean region for centuries. In this paper, some technological and analytical aspects of the S. montana tinctures development and an evaluation of the essential oil composition are provided. The total phenolic and flavonoid contents and phenolic compounds profile analyzed spectrophotometrically and by high-performance thin-layer chromatography (HPTLC), respectively, were evaluated in the developed tinctures. The results showed that the tinctures prepared from the S. montana herb by maceration or remaceration are rich in polyphenols, and there is an influence of…
Optimized Deposition of Graphene Oxide Langmuir-Blodgett Thin Films
2014
Abstract Single sheet graphene (SG) is an innovative transparent material with high electrical and thermal conduction the use of which in transparent electrodes instead of traditional materials improves the performance of optoelectronic devices. In this study, graphene oxide (GO) has been obtained by a modified Hummer`s method followed by an advanced technique of water removal (lyophilisation). The Langmuir-Blodgett (LB) method was applied to transfer GO from suspension to substrate. To optimize the deposition process, as suspending and spreading solvents the benzene and benzene/methanol mixtures were chosen instead of previously studied water suspensions. The number of GO layers in suspens…
Jurons et interjections dans l'univers de Tintin: modifications, élargissement et reduction de sens dans les traductions italiennes.
2014
Swear words and interjections in the world of Tintin: changes, enlargement and reduction of meaning in Italian translations. Tintin is one of the best known all over the world French language comics. Even in Italy Tintin has been translated and published. Starting from a linguistic analysis on Haddock’s swearwords, one of the best friend of Tintin, we will observe the Italian translations (four editions from 1965 to 2011) of the French album Le crabe aux pinces d’or.
Clinical Description of a Different Form of Tinnitus: Intermittent Tinnitus
2011
1. Intermittent (paroxysmal) tinnitus is a form of non-pulsatile tinnitus. 2. An intermittent nature can be the only sign that intermittent tinnitus is different from other forms of tinnitus. 3. Intermittent tinnitus may be accompanied by irregular symptoms of other neurotologic disorders. 4. Both objective and subjective tinnitus may be intermittent. 5. A wide range of pathologies may cause intermittent tinnitus, but the cause of most forms is unknown.