1,721,174 research outputs found
Multistructured membranes based on electro-dynamic technologies: process optimization and catalytic performances
Full text linkElectodynamic technologies represent a challenging task in the nanotechnology field for producing multistructured and multifunctional membranes, based on nanofibers and nanoparticles that have been shown to be a good candidate as photocatalytic membrane on VOCs degradation. Before going toward fabrication of multistructured membranes, it is necessary to optimize the process of fiber formation. At this regard Response Surface Methodology (RSM) represents a versatile tool for exploring the space of the process or independent variables, empirical statistical modeling to develop an appropriate approximating relationship between the yield and the process variables, and optimization methods for finding the values of the process variables that produce desirable values of the response. Subsequently, it has been implemented a method for multilayer membranes fabrication in order to deposit inorganic nanoparticles and optimize their distribution over polymeric nanofibers. The processed membranes have been adequately characterized and phocatalytic performance tested.le tecnologie elettroidro dinamiche costituiscono un valido strumento nell'ambito delle nanotecnologie per la produzione di membrane multistrutturate e multifunzionali costituite da nanofibre e nanoparticelle che trovano applicazione nel settore della fotocatalisi per la rimozione di VOCs. Prima di procedere alla produzione vera e propria è necessario ottimizare il processo di elettrofilatura. a tal riguardo la metodologia di risposta delle superfici è un valido strumento per esplorare il processo, valutare e stabilire un'adeguata relazione tra la variabile risposta e le variabili di processo e rilevare la configurazione più adeguata per l'ottenimento di una fissata risposta. Successivamente, è stato implementato un metodo per la produzione di membrane multistrato in cui particelle inorganice sono depositate su nanofibre polimeriche. Tali membrane sono state adeguatamente caratterizzate ed è stata studiata la loro attività catalitica nei confronti di agenti inquinanti
Environmental Applications of Electrospun Biopolymers and Multistructured Membranes
No full textSpinning an spraying techniques represent an effective and economic tool for processing biopolymers membrane and multifunctional fibrous structures. Since the fiber morphology, diameter and patterning of fiber edeposition can be controlled, these technologies find a wide range of applications into bioengineering, with tissue scaffolds processing , drug delivery and wound dressing, energy and electronics, defense and security. In fact electrospun nanofibers has found to be a good candidate for advanced protective clothing for bio-warfare agents degradation. An other promising field regards the envinromental engineering, especially with filter membranes. This is because nanofiber filter media have enabled new levels of filtration and environmental clean up performances in a broad range of applications since they have proven to be a good candidate for promoting a significant increase in filter efficiency and life and more contaminate holding capacity. Unclean air which contains bacteria can be also purified using nano-size level fibrous membrane. Moreover electrospun bioresorbable polymer nanofibers could be used as an effective plant protecting agent
Process optimization on nanostructured membranes based on Electrostatic and hydro-dynamic technologies
No full textNanostructured membranes as advanced solutions for VOCs control: the synergy of graphene and TiO2 nanoparticles
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