1,721,057 research outputs found
Structural characterization of nanodiamonds/conducting polymer by electron microscopy techniques
No full textStructural identification of the noble metal nanoparticles and conducting polymer combined with nanodiamonds by electron microscopy techniques
No full textStructural Identification of interface properties in multi-component carbon-based materials by electron mycroscopy techniques
No full textThe project is focused on high structural identification of interface properties in multicomponents Carbon-based nanomaterials. The multicomponent assemblies can be considered as one class of nanomaterials modified at their external surface by attaching different nanocomponents via chemical bonds, Van der Walls interactions, or wrapping and so on.
Here, our typical systems are mainly based on carbon nanotubes (CNT’s) coated or decorated by nanoparticles or by polymer in form of chains or globular structures. In a multicomponents nanomaterials chemical physics properties can be considerably affected by the interaction strength on the interface contact, and by the distribution and concentration of species over the entire CNT surface. Finally nano-morphology of foreign particles could be play a key role in material functional properties
Studi di Ottica Non Lineare del Terzo Ordine di Metallo-Bis-Ftalocianine allo stato solido su film sottili
No full textHigh Resolution Identification of Interface Structure in Multicomponents Carbon-based Nanomaterials.
No full textHigh Resolution Identification of Interface Structure in Multicomponents Carbon-based Nanomaterials. The compounds were observed at low and high magnifications by imaging and electron diffraction modes, performed by 2010, 3000F and 4000HR TEMs, supported by EDS and STEM analyses depending from the compound
Third order nonlinear optics studies of Metal-Bis-Phthalocyanines
No full textThird order nonlinear optics studies of Metal-Bis-Phthalocyanines as thin film. Z-scan measurements by light source of 6 ns pulses from Q-switched Nd:YAG laser operating at 532 nm, pulse repetition rate of 10 Hz. Thin films were prepared by vapour vacuum deposition and by spin-coating on glass substrate
High Resolution Identification of Interface Structure of Conducting Polymer Trapping Carbon-based Nanomaterials.
No full textThe project is focused on high structural identification of interface properties among conducting polymer within carbon-based nanomaterials. One successful scheme is to form multicomponent assemblies of the polymer with well-dispersed band-gap nanoparticles interacting via chemical bonds, Van der Walls interactions, or wrapping and so on.
Here, our typical composite systems are mainly based on nanodiamonds coated or decorated by conducting polymer in form of linear chains or globular aggregates. In multicomponent nanomaterials, chemical physics properties can be considerably affected by the interaction strength on the interface contact, and by the distribution and concentration of species trapped into polymers. Such composites have gained importance because they can be tuned to combine high electrical conductivity, which is characteristic of inorganic materials, with poor thermal conductivity, which is an inherent property of organic polymers. All these nanocomposites show improvement of electrical conductivity by incorporating nanodiamonds (NDs) in a conducting polymer matrix. As carbon-based nanomaterials are very stiff and tough, they also enhanced the mechanical strength of the polymer composites
Studio strutturale in fase amorfa allo stato solido e studio delle proprietà di ottica non lineare del terzo ordine in soluzione di derivati ftalocianinici.
No full textL’argomento di questa tesi di Dottorato è incentrato sullo studio di materiali organici per ampliare la conoscenza dello studio strutturale al fine di migliorare le prestazioni dei dispositivi per le applicazioni di elettroluminescenza, per il fotovoltaico, per la sensoristica e per l’ottica non lineare. I materiali organici studiati sono dei sistemi macrociclici tetrapirrolici di tipo metallo ftalocianinici, metallo dimero ftalocianinici e metallo bis-ftalocianinici. E’ stato effettuato uno studio strutturale su quattro tipi di metallo-ftalocianine in fase amorfa allo stato solido. L’obbiettivo dell’indagine strutturale è stato sia la caratterizzazione della singola molecola che la caratterizzazione dello stato di aggregazione molecolare della fase amorfa confrontata con le fasi cristalline di tipo α e β studiate in passato. In questo lavoro è stato valutato anche che il dimero di Rutenio ftalocianina potrebbe essere considerato un discreto macrociclo per le applicazioni di sensoristica ambientale, come sensore a gas singolo per il NO2 mediante la sua caratterizzazione strutturale. Lo studio delle proprietà di ottica non lineare sui sistemi bis-ftalocianinici ha permesso di valutare il ruolo dell’atomo metallico centrale, attraverso dei semplici prototipi, come uno dei fattori determinanti che contribuisce alla risposta di ottica non lineare di tali sistemi. In conclusione i sistemi organici ftalocianinici hanno elevate e molteplici applicazioni in differenti ed attuali settori tecnologici
Supramolecular Organization of Single Nano-Objects by Radial Distribution Function Analysis
No full textHere, we have reported the structural study of materials with a low dimensional molecular aggregation by EDXD technique and RDF analysis. This concerns in particular several advantages: i), more accurate information on the intra- and inter-molecular interaction because of the very extended accessible q scattering parameter range; ii) allows to spatially probe the different chemical species of the nano-object; and iii) determination of supramolecular organization of a single nano-objects by RDF analysis for small volume and/or physical dimensions of nanostructured materials
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