3,377 research outputs found
La misura della sostenibilità e il ruolo delle imprese
No full textQuesto primo articolo sulla sostenibilità ci dà un quadro veramente ampio sul problema, affrontando tutti gli aspetti che questa parola - a volte anche abusata o usata in contesti ai quali non appartiene - e spiegandoli molto chiaramente e dettagliatamente. Solo chi affronta il problema con i criteri di un ricercatore e con la completezza che il lavoro in Sede Universitaria
richiede può dare al lettore una panoramica molto articolata ed esauriente, corredata anche da una corposa bibliografia. Sia la professoressa Palumbo che il prof. Rosace sotto questo punto di vista non potevano non essere all’altezza della situazione. La prima è docente e ricercatrice di Progettazione Sostenibile presso il Dipartimento di Ingegneria e Scienze Applicate (DISA) dell’Università di Bergamo.
Precedentemente, dal 2012 al 2022, è stata ricercatore senior e docente presso lNaB (Institute of Sustainability in Civil Engineering) della RWTH Aachen University in Germania, dove ha lavorato sui temi della sostenibilità ambientale, economica e sociale applicata al settore delle costruzioni e dell’arredo. Giuseppe Rosace è Professore Ordinario di Chimica Generale e Inorganica presso il Dipartimento di Ingegneria e Scienze Applicate dell'Università degli studi di Bergamo. Dal 2022 è Delegato del Rettore al trasferimento tecnologico, spin-off e rapporti con la Fondazione U4I. Coordina inoltre il Laboratorio “Textile Chemistry, Composites and Interface Science” presso il Campus di Ingegneria dell'Università di Bergamo. È inoltre componente del Collegio del Dottorato di Ricerca in Ingegneria
e Scienze Applicate, presso il quale è titolare del corso “Environmentally friendly treatments for surface functionalization”. Come potete vedere due esperti del problema della Sostenibilità che possono certamente darci informazioni che ci fanno di sicuro capire la complessità del problema in modo chiaro
Trattamenti superficiali di substrati tessili: esempi di tecniche di aggraffaggio e delle relative proprietà indotte
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Influence of low-temperature plasma conditions on wicking properties of PA/PU knitted fabric
No full textPlasma surface treatment has been extensively applied in the textile industry for the modification of polymer materials. In this study low-temperature plasma (LTP) is used for surface treatment of polyamide/polyurethane (PA/PU) knitted fabric. The envisaged plasma effect is an increase in the surface energy of the treated textile, leading toward improved hydrophilic properties. The knitted fabric was treated by LTP using three non polymerizing gases: oxygen, air, and carbon dioxide. After plasma treatment, wettability of samples was tested through their wicking properties measuring capillary rise after water bath contact. The PA/PU knitted fabric samples treated with different plasma gases exhibited different hydrophilic performances. The influence of plasma variables (discharge power, time, pressure) was investigated. Although the chemical characteristics of elastan (PU) and nylon (PA) threads are different, the study has demonstrated that plasma treatment can in the same time alter the surface-wetting behavior of both the components of the knitted fabric. It was also shown how these treatments can be regulated to produce the desired level of hydrophilicity dependently on the request application
The reactions of symmetrically disubstituted Dithiooxamides with Platinum(II) organometallic complexex of the type CIS-[PTR2L2] (L= ME2SO OR ME2S; R= ME OR PH)
No full textDesign and development of wearable sensing nanomaterials for smart textiles
No full textRecently, textiles have been entering in a next-generation of materials able to interact with their surroundings, through the incorporation of electronic devices with various functionalities for the human body, such as batteries, displays, sensors. In these aspects, smart textiles seem to be a highly suitable possibility, due to the advantages of textiles, nanotechnology and electronics. In fact, textiles usually show strength and hardness but also ductility and flexibility, so that they can be easily manipulated and adapted to a wide range of end-use requirements. Moreover, nanotechnology exhibits significantly improved physical and chemical functionalities and properties due to their nanoscaled size. Furthermore, miniaturized circuits result to be extremely low-power with respect to other commercial solutions and they are thus suitable for portable applications. These systems, comprising small physiological sensors, transmission modules and processing capabilities, can turn out useful for real-time health status monitoring. In this paper, the recently reported and significantly developed smart textiles are summarized, including their enhanced optoelectronic al and conductivity properties
Synthesis and characterization of bio-based polymers for innovative additive manufacturing applications via stereolithography 3D printing
No full textThis thesis focused on the study and development of bio-based and biocompatible photosensitive resin for stereolithography 3D printing.
One of the seven additive manufacturing technologies, vat photopolymerization, utilizes a combination of liquid photosensitive polymers with a photoinitiator and a UV emitter to fabricate objects. The main advantage of this method is that it allows the creation of highly detailed objects. Indeed, this is the main reason why vat photopolymerization is interesting for biomedical applications, whereby combining it with other imaging techniques, it is possible to create patient-made prothesis and implants. Unfortunately, most resins used nowadays are derived from petroleum, limiting their application.
Different types of materials were proposed to expand the variety of bio-resins. Among all, vegetable oils and plant-based resins demonstrated some promising properties. They are available worldwide and have relatively low production costs. Moreover, they can be easily functionalized to be suitable for photopolymerization. Soybean oil being a good example. Its functionalization is already used for UV coating, but its full potential in 3D printing is yet to be explored.
In this research study, the utilization of functionalized soybean oil, more precisely, acrylated epoxidized soybean oil (AESO), for 3D-printing was investigated. Here, AESO was tested for different application: from improving the biobased content of commercial a resin, to the synthesis and optimization of complete biobased and biocompatible resins.
For the first study, increasing concentrations of neat AESO were combined with Peopoly moai standard clear resin, where its influence on the resin performance was tested using different characterization techniques. Tensile test results were also compared with data from other standards of commercial resins to see how it would scale. The doping of petroleum-based resins with biobased resins is interesting since it is a simple method to increase the bio-renewable content of such materials.
However, the main objective is the transitioning from petroleum-based to complete bio resins, thus for that, in the subsequent study, AESO was combined with another plant-based material to develop a biobased resin. The mechanical and curing properties of this new resin were again compared with various standard resins to verify its performance. Furthermore, other characterization analyzes were done to better understand its photopolymerization reaction and final application.
Based on the information obtained from developing a biobased resin, AESO was used for creating a biocompatible resin. For that, it was combined with a known biocompatible material, poly(ethylene) diacrylate, and different physical and chemical properties were studied. Furthermore, the mixture which demonstrated the best performance was used in a following study that had the objective to add nanoparticles to improve its mechanical properties. The fillers used were micro- and nano- crystalline cellulose, a natural material that has already shown remarkable properties at low dosages.
The studies presented in this work are only the beginning. Further research needs to be carried out to test the performance of the biocompatible resins developed in cell cultures. Future perspectives can also consist of the evaluation of different vegetable oils, or the usage of non-food related materials (ex: algae) to develop these new bio-resins. Additionally, other types of particles can be explored as well to add new properties, such as flame retardancy, conductivity, memory shape, and others
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