Search results for "Principi"
showing 10 items of 580 documents
Patent number RM2009A000073: Procedimento di preparazione di scaffold polimerici preangiogenizzati
2009
Classe proposta A61F - Filtri da inserire nei vasi sanguigni; protesi; apparecchi ortopedici e curativi per contraccezione; fomentazione; trattamento o protezione degli occhi e delle orecchie; bendaggi, garze per medicazioni e assorbenti; necessario per il pronto soccorso
Solidification of Polypropylene Under Processing Conditions – Relevance of Cooling Rate, Pressure and Molecular Parameters
2012
Il concetto di "no-flow temperature" e il problema della solidificazione in flusso durante lo stadio di riempimento nel processo di stampaggio ad ini…
2012
Durante la fase di riempimento del processo di stampaggio ad iniezione, il flusso del materiale polimerico può fermarsi a causa della sua elevata viscosità, nonostante non sia avvenuta la solidificazione tramite transizione vetrosa o cristallizzazione. La no-flow temperature (NFT) è un parametro che rappresenta la "temperatura di solidificazione reologica" di un polimero, ed è utilizzata in molti software di simulazione del processo di stampaggio ad iniezione. L'estrapolazione della viscosità a basse temperature tramite modelli reologici può introdurre errori considerevoli nelle simulazioni, poichè le misure di viscosità sono usualmente effettuate ad alte temperature: in tal modo, i modelli…
Photocatalytic and photoelectrocatalytic H2 evolution combined with valuable furfural production
2023
In this work the photocatalytic (PC) and photoelectrocatalytic (PEC) reforming of furfuryl alcohol (FA) under environmental friendly conditions was investigated. Both H2 evolution and partial oxidation to furfuraldehyde were followed. For the first time TiO2 based photocatalysts were studied and the photocatalytic activity of home prepared photocatalysts was compared with that of commercial ones under both UVA and simulated solar irradiation. PEC tests were performed by using home prepared TiO2 nanotubes (TiO2 NTs) as photoanode and Pt free Ni foam as cathode to improve the Hydrogen Evolution Reaction (HER). Both the partial FA oxidation reaction rate and H2 evolution rate were normalized f…
Selective Heterogeneous Photocatalysis: Achievements and Challenges
2009
A facile way to synthesize noble metal free TiO2 based catalysts for glycerol photoreforming
2023
In this work anaerobic heterogeneous photocatalytic solar/UV light reforming of glycerol in aqueous media was performed with Pt-photodeposition and noble metal free modified TiO2 photocatalysts prepared through ball milling, a very simple and cheap coupled catalyst preparation method. Different amounts of Cu2O or 3% CuO were loaded on TiO2 using ball milling and during each run glycerol conversion, hydrogen and CO2 formed in the gas phase and 1,3-dihydroxyacetone (DHA) and glyceraldehyde (GA) in the liquid phase were determined. The results were compared with the aim to verify the effectiveness of Cu2O in replacing Pt. Using noble metal free photocatalysts, 33% glycerol conversion, 10.3% an…
Composite Coatings of Chitosan and Silver Nanoparticles Obtained by Galvanic Deposition for Orthopedic Implants
2022
In this work, composite coatings of chitosan and silver nanoparticles were presented as an antibacterial coating for orthopedic implants. Coatings were deposited on AISI 304L using the galvanic deposition method. In galvanic deposition, the difference of the electrochemical redox potential between two metals (the substrate and a sacrificial anode) has the pivotal role in the process. In the coupling of these two metals a spontaneous redox reaction occurs and thus no external power supply is necessary. Using this process, a uniform deposition on the exposed area and a good adherence of the composite coating on the metallic substrate were achieved. Physical-chemical characterizations were car…
Hydroxyapatite/Chitosan/Collagen coatings through galvanic coupling
In this work, the attention was focused on Hydroxyapatite/ Chitosan/Collagen composite as biocoatings for application in orthopaedic devices. Hydroxyapatite was selected for its osteoconductivity due to its chemical structure similar to bones. Collagen has the same function since 90-95% of bone matrix is constituted of collagen fibers. Furthermore, chitosan are largely used yet in medical field (e.g. antibacterial agent or drug deliver) and in this work were used to create a synergic interaction with hydroxyapatite and collagen to increase the strength and bioactivity of coating. Coatings were fabricated by galvanic deposition process that has different advantages an it does not require ext…
Deposition and characterization of Hydroxyapatite-Chitosan coatings on 304 SS for biomedical devices
2019
During the last years biomaterials have been largely investigated in order to perform and improve biomedical devices. As regards orthopedic field, the most common equipment used (such as implants, bone grafts or screws) are constituted by metallic materials (steel and titanium alloys), characterized by low/medium resistance to corrosion and low osteointegration ability. Furthermore, these factors could produce local inflammations of the tissues surrounding the implants, increasing kinetics of corrosion phenomena. Scientific community has focused the attention on biocoatings interposed between metal and aggressive environment in order to inhibit corrosion. Furthermore, these coatings are abl…