Search results for " MATERIALI"
showing 10 items of 710 documents
A specific operative protocol set up during the restoration of the Grammichele's slate slab
2009
La Madonna della Lavina di Cerami: preentazione estetica, osservazione dei materiali di restauro
2011
Preparazione e caratterizzazione di film a base di EVA con proprietà antimicrobiche
2009
An innovative route to prepare in situ graded crosslinked PVA graphene electrospun mats for drug release
2022
We present a fast, one step method to obtain PVA/graphene/chlorhexidine nanofibrous membranes, with a crosslinking gradient along their cross-section. Briefly, polymeric solutions were electrospun onto a heated plate, enabling the in situ crosslinking of PVA macromolecules. Of course, the crosslinking degree of such structures was found to decrease upon the distance from the plate during deposition. The outcomes reveal the crucial role of graphene, capable of promoting heat transfer throughout the entire structure, thus leading to 70-80% crosslinking degrees and preventing delamination issues. Such membranes were compared to untreated and oven thermally treated ones, and a robust relationsh…
Lemongrass Plant as Potential Sources of Reinforcement for Biocomposites: A Preliminary Experimental Comparison Between Leaf and Culm Fibers
2022
AbstractNowadays, the world requires more sustainable and eco-friendly materials to replace or limit the usage of synthetic materials. Moreover, several researchers focused their attention on the use of agricultural sources as reinforcement for biocomposites since they are abundant, cost-effective and environmentally favorable sources. In such a context, purpose of the present paper is the evaluation of lemongrass plant (Cymbopogon flexuosus) as possible source of natural reinforcement for biocomposites. To this aim, natural fibers were obtained from the leaf and the stem of lemongrass and their main properties were compared for the first time. To this scope, mechanical and thermal characte…
USE OF FOAMED END-OF-WASTE PLASTIC AGGREGATES AS INTERNAL CURING WATER RESERVOIR INTO A CEMENTITIOUS MORTAR
2017
Shrinkage phenomena represent an important issue for cementitious materials. There are several procedures able to reduce shrinkage phenomena, in particular, external and internal curing. The latter consider the possibility to add water reservoir that are able to release water during the curing period. In this study, porous plastic aggregates were used as internal curing water reservoir.
Reliability and Fabrication of Molds for Nanoimprinting
2010
During the last decade there has been a growing attention to nanoscaled materials and to the related technologies to produce them. The problems to overcome in the manufacturing of these kinds of items increase dramatically on decreasing the dimension of the devices. In this sense, the scientific research has been strongly stimulated to try to improve and optimize all the critical issues. One of the most attractive fields in nanomanufacturing is related to nanoimprinting, i.e. to the possibility to transfer a nanoscaled pattern from a mold to another substrate. In this technology, among the others, there are two main critical steps: the preparation of a good mold and the use of a correct rel…
Photovoltaic performance of amorphous silicon flexible solar modules under mechanical loading
2007
The applications of photovoltaic devices can be significantly expanded by directly integrating them into structures. Solar cells integrated into structures can help to power a variety of devices such as structural monitoring sensors and unmanned aerial vehicles (UAVs). However, little work has been reported in the literature on the performance of solar cells under deformation. Thus, a thorough investigation on the photovoltaic behavior of solar modules under mechanical loading is necessary in order to provide the optimal integration conditions for practical applications. The photovoltaic performance of commercially available amorphous silicon solar modules was tested under applied mechanica…
Effetto del flusso elongazionale su nanocompositi a base di miscele polimeriche.
2018
Scopo di questo lavoro è stato, pertanto, quello di studiare l’effetto del flusso elongazionale su nanocompositi a base di miscele poliammide/polietilene al fine di valutare come questo possa influenzare e modificare le principali proprietà. In particolare, si è osservato come variano le proprietà meccaniche fra il materiale isotropo (piastrine ottenute per stampaggio a compressione) e il materiale orientato ottenuto per filmatura in bolla.