Ricerc@Sapienza

In this paper, studies are presented on electrical tuning of optical channels formed by the PDMS-based waveguides infiltrated with a liquid crystalline material. In particular, preliminary results are demonstrated of numerical simulations demonstrating changes in optical parameters of the waveguide channels when influenced by electric field applied via flat and IPS electrodes in order to fabricate photonic switches based on optical directional couplers. The first experimental trials of sputtering the ITO layer on PDMS substrate are also shown.

The material characterization of the gaseous electron
multiplier (GEM) detectors is presented in this article;
mechanical tests were performed to examine the mechanical
performance of polyimide (Kapton) and GEM foil.
Bearing in mind the mechanical stresses imposed during
the assembly and subsequently during operation at Compact
Muon Solenoid (CMS). The detectors will run for
many years in the harsh radiation and environmental conditions
at the CMS. In view of this a series of the tensile

End-of-life photovoltaic modules can be hazardous wastes if they contain hazardous materials. The main problem arising from this type of waste is the presence of environmentally toxic substances and the poor biodegradability of the waste, which occupies great volumes when landfilled. For these reasons, photovoltaic modules have to be treated before landfilling as required by the legislation. The subject of this paper is the polycrystalline silicon type photovoltaic modules. They were treated with a physical and a chemical process.

Non-Fickian behaviors in mass transport are very common in polymeric materials. The classical Fickian law, dictating the instantaneous response of the mass flux to changes in the driving force (namely the concentration gradient), seems to be too simplistic for mass transport in viscoelastic materials, generally linked through characteristic times to stress relaxation or structural changes. A constitutive equation in which the evolution of the mass flux is governed by a characteristic relaxation time thus appeared to be the most natural choice in order to catch anomalous behaviors.

In this study, polythiophene copolymers have been used as modifier for electrode surfaces in order to allow the immobilization of active pyrroloquinoline quinone dependent glucose dehydrogenase (PQQ-GDH) and to simultaneously improve the direct electrical connection of the enzyme with the electrode. Polymer films are electrosynthesized in aqueous solution without the need of surfactants onto carbon nanotubes modified gold electrodes from mixtures of 3-thiopheneacetic acid (ThCH2CO2H) and 3-methoxythiophene (ThOCH3) using a potentiostatic pulse method.