244 research outputs found
MURANO PIXEL. An experimental and shared research
No full textThe paper describes the motivation, approach and working methodology of a research project financed with POR FSE funds by the Veneto Region. The research involved two universities (Università Iuav di Venezia and Università Ca’ Foscari Venezia), three glassworks in Murano, two network partners (Anteferma Edizioni and WASP) dedicated to innovation and the dissemination of innovation, and three young researchers. A network of professional figures,
production realities and interlocutors developed around the figures institutionally involved in the project. These
collaborations arose from the desire to share knowledge, production skills and experimentation. Moreover, the
research was not limited to Murano but opened up this territory to international debate. This paper proposes the
Venice Lagoon as a case study to develop research dedicated to the recycling of materials towards an increasingly
comprehensive and complex approach. This is a challenge. The short circuit between the vitality of artisan work and research activity must be triggered
Cu-doped photovoltaic glasses by ion exchange for sunlight down-shifting
No full textIon exchange process is a widely studied synthesis technique for the controlled modification of silicate
glass composition and properties, being moreover an easy and cheap approach. Silicate glasses containing
copper are known to exhibit a broad luminescent band peaked around 500 nm, ascribed to 3d10-3d94s1 electronic transition of Cu+ ions; this band turns out to be much promising for the realization of
down-shifting systems, being excited in the UV and neareUV region. Luminescent Cuedoped silicate
glass sheets suitable as downeshifters to be used for covering solar cells have been prepared by thermal
ion exchange. Synthesis of the Cuedoped glasses has been done by dipping pure silicate sheets
(commercially used as cover of photovoltaic panels) into a fused copper salt mixture at temperature of
400 °C, for duration between a few minutes and some hours; two different types of copper chloride salt
mixtures were explored, with the aim at obtaining luminescent glasses able to improve the Si cell yield.
Absorption and luminescence glass features were collected and compared. The performance of the
different samples was tested by a solar simulator, measuring the output power of a Si solar cell covered
with the Cuedoped glass slides
MURANO PIXEL. An experimental and shared research.
No full textThe paper describes the motivation, approach and working methodology of a research project financed with POR FSE funds by the Veneto Region. The research involved two universities (Università Iuav di Venezia and Università Ca’ Foscari Venezia), three glassworks in Murano, two network partners (Anteferma Edizioni and WASP) dedicated to innovation and the dissemination of innovation, and three young researchers. A network of professional figures, production realities and interlocutors developed around the figures institutionally involved in the project. These collaborations arose from the desire to share knowledge, production skills and experimentation. Moreover, the research was not limited to Murano but opened up this territory to international debate. This paper proposes the Venice Lagoon as a case study to develop research dedicated to the recycling of materials towards an increasingly comprehensive and complex approach. This is a challenge. The short circuit between the vitality of artisan work and research activity must be triggered
Modelling the ion exchange process in glass: Phenomenological approaches and perspectives
No full textA great deal of work has been devoted in the last decades to the study of the ion exchange process modelling, in order to tailor the physical properties of the modified layers, e.g. refractive index or stress profiles. The first models were based on simple ionic diffusion equations, while in the last years it became clear that the glass undergoes local restructuring during the ion exchange even at temperatures lower than the glass transition one. The aim of this work is to review the approaches that lead to the introduction of self-diffusion coefficients depending on the concentration of the migrating cations, and to outline a physical approach in selecting a phenomenological expression for the coefficients. In particular, this approach refers to models developed for describing the ionic diffusion in mixed-alkali glasses
Multi-edge X-ray absorption spectroscopy study of road dust samples from a traffic area of Venice using stoichiometric and environmental references
No full textThe appropriate selection of representative pure compounds to be used as reference is a crucial step for successful analysis of X-ray absorption near edge spectroscopy (XANES) data, and it is often not a trivial task. This is particularly true when complex environmental matrices are investigated, being their elemental speciation a priori unknown. In this paper, an investigation on the speciation of Cu, Zn, and Sb based on the use of conventional (stoichiometric compounds) and non-conventional (environmental samples or relevant certified materials) references is explored. This method can be useful in when the effectiveness of XANES analysis is limited because of the difficulty in obtaining a set of references sufficiently representative of the investigated samples. Road dust samples collected along the bridge connecting Venice to the mainland were used to show the potentialities and the limits of this approach
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