6,175 research outputs found
Nanostructured films of refractory materials produced by ultra-short Pulse Laser Deposition
No full textAnalisi LIBS (Laser Induced Breakdown Spectroscopy) di manufatti in argento provenienti da Chiaromonte e Torre di Satriano
No full textMatrix-isolation IR studies on alkali metal M(XO2 species. Bonding and structure of Li(CO2), M(ClO2) and M(BO2) molecules
No full textpi-conjugated poly(monosubstituted) acetylenes containing Sn(II) and Sn(IV) species: investigation with laser ionization mass spectrometry
No full textPolyenes [HC=CR](n) (R = Ph, C13H9O), namely polyphenylacetylene (PPA) and polyethynylfluorenol (PEFI) containing Sn(II) and Sn(IV) in the polymer matrix, have been investigated using laser ionization mass spectrometry. The positive ion mass spectra show that carbon clusters linked to Sn, i.e. SnCnH+ (n = 1-25) are formed for PPA, while a higher degree of fragmentation occurs for PEFI which gives SnCnH+ (n = 1-8). The species SnCl3- is found in the negative ion patterns of the two polymers, regardless of whether the dopant was SnCl2 or SnCl4. This result suggests a lower stability of the tin complexes, formed by interaction with the polymer matrix, with respect to the iron chlorides or polyiodides species found in the LMS spectra of PPA/FeCl3 and PPA/I-2, respectively, previously studied
Fecl3-doped Poly(phenylacetylene) Investigated By Means of Laser Ionization Mass-spectrometry
No full textThe laser ionization mass spectrometry technique has been used for the study of FeCl3-doped poly(phenylacetylene) (FeCl3-PPA). Assessment of the ionic fragments has been exploited by comparison of the spectra of FeCl3-PPA with those of reference compounds. Evidence of carbon clusters bonded to iron or to the FeCl moiety is reported; interaction of the chain C=C double bonds with iron leads to stable complexes where the allenic or acetylenic chains can be considered as macro ligands. The negative-ion patterns give evidence of the charge-transfer reaction also occurring between FeCl3 and PPA
Processo per ottenere un rivestimento neoceramico di protesi metalliche per osseointegrazione
No full textUltra-Short Pulsed Laser Deposition of Oxides, Borides and Carbides of Transition Elements
No full textOxides, borides and carbides of the transition elements are materials of great interest from a technologic point of view. Many of these materials are used in the form of thin films, so several techniques are commonly used to deposit them. Among these techniques, Pulsed Laser Deposition (PLD) performed using ultra-short pulse lasers, mainly fs lasers, presents unique characteristics in respect to PLD performed using conventional short pulse lasers. Indeed, the films deposited using fs PLD are often nanostructured, and this technique often allows the target stoichiometry to be transferred to the films. In this work, we will review the use of ultra-short PLD in the production of films obtained from transition metal oxides, borides and carbides, evidencing the advantages offered by this technique, together with the problems arising with some of the studied systems. We conclude that even if ultra-short PLD is surely one of the most important and useful deposition techniques, it also presents limits that cannot be ignored
Audiomobiles, Sculptures and Conundrums
No full textRoberto Gerhard was a pioneer of electronic music in England creating a number of substantial concert, theatre and radio works from as early as 1954. Gerhard’s electronic music is one of the richest repositories for understanding the development of the composer’s late compositional technique. Apart from the Symphony no.3, ‘Collages’, none of Gerhard’s electronic music is published. This paper will discuss aspects of Gerhard’s electronic music, focusing on Audiomobiles (1958-59) and Sculptures (1963)
- …
