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16 results on '"Desiderio, Giovanni"'

1. Fluorescence Profile of Calabrian Opuntia ficus-indica Cladodes Extract: a Promising Low-cost Material for Technological Applications

Author

Ferraro, Antonio, Sighano, Sephora Kamwe, Caputo, Roberto, Cofone, Franco, Desiderio, Giovanni, and Gennari, Oriella

Subjects
Physics - Optics, Condensed Matter - Materials Science
Abstract

The autofluorescence of calabrian Opuntia ficus-indica bioactive extract upon UV illumination is explored by fluorescence spectroscopy enabling to investigate the typology and distribution of responsible molecules within green cladodes. The spectroscopic analysis of the extract shows a significative red emission, suggesting an abundance of chlorophylls in the sample. Such molecules show pronounced fluorescence in the visible range (400-800 nm) with a very large Stokes shift, when excited with UV light source. The fluorescence profiling is performed also in the case of polymers, such as poly(methyl methacrylate) (PMMA), poly(vinylpyrrolidone) (PVP) and polyvinyl alcohol (PVA), enriched with OFI extract with a signal improvement up to 40 times greater than the extract alone. This by-product fluorescent molecule can replace commercial dyes into several applications spanning from nano-optics to anti-counterfeiting and bioimaging.

Published
2024

2. Flexible Physical Unclonable Functions based on non-deterministically distributed Dye-Doped Fibers and Droplets

Author

Bruno, Mauro Daniel Luigi, Lio, Giuseppe Emanuele, Ferraro, Antonio, Nocentini, Sara, Papuzzo, Giuseppe, Forestiero, Agostino, Desiderio, Giovanni, De Santo, Maria Penelope, Wiersma, Diederik Sybolt, Caputo, Roberto, Golemme, Giovanni, Riboli, Francesco, and Barberi, Riccardo Cristoforo

Subjects
Condensed Matter - Materials Science, Condensed Matter - Soft Condensed Matter, Electrical Engineering and Systems Science - Image and Video Processing, Physics - Applied Physics, Physics - Chemical Physics, Physics - Optics
Abstract

The development of new anti-counterfeiting solutions is a constant challenge and involves several research fields. Much interest is devoted to systems that are impossible to clone, based on the Physical Unclonable Function (PUF) paradigm. In this work, new strategies based on electrospinning and electrospraying of dye-doped polymeric materials are presented for the manufacturing of flexible free-standing films that embed different PUF keys. Films can be used to fabricate anticounterfeiting labels having three encryption levels: i) a map of fluorescent polymer droplets, with non deterministic positions on a dense yarn of polymer nanofibers; ii) a characteristic fluorescence spectrum for each label; iii) a challenge-response pairs (CRPs) identification protocol based on the strong nature of the physical unclonable function. The intrinsic uniqueness introduced by the deposition techniques encodes enough complexity into the optical anti-counterfeiting tag to generate thousands of cryptographic keys. The simple and cheap fabrication process as well as the multilevel authentication makes such colored polymeric unclonable tags a practical solution in the secure protection of merchandise in our daily life.

Published
2023

7. Additive Manufacturing of Gold Nanostructures Using Nonlinear Photoreduction under Controlled Ionic Diffusion

Author

Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Di Cianni, Wera, Mata Fernández, María de la, Delgado Gonzalez, Francisco, Desiderio, Giovanni, Molina Rubio, Sergio Ignacio, Sanz de León, Alberto, Giocondo, Michele, Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica, Di Cianni, Wera, Mata Fernández, María de la, Delgado Gonzalez, Francisco, Desiderio, Giovanni, Molina Rubio, Sergio Ignacio, Sanz de León, Alberto, and Giocondo, Michele

Abstract

Multiphoton photoreduction of photosensitive metallic precursors via direct laser writing (DLW) is a promising technique for the synthesis of metallic structures onto solid substrates at the sub-micron scale. DLW triggered by a two photon absorption process is done using a femtosecond NIR laser (lambda = 780 nm), tetrachloroauric acid (HAuCl4) as a gold precursor, and isinglass as a natural hydrogel matrix. The presence of a polymeric, transparent matrix avoids unwanted diffusive processes acting as a network for the metallic nanoparticles. After the writing process, a bath in deionized water removes the gold precursor ions and eliminates the polymer matrix. Different aspects underlying the growth of the gold nanostructures (AuNSs) are here investigated to achieve full control on the size and density of the AuNSs. Writing parameters (laser power, exposure time, and scanning speed) are optimized to control the patterns and the AuNSs size. The influence of a second bath containing Au3+ to further control the size and density of the AuNSs is also investigated, observing that these AuNSs are composed of individual gold nanoparticles (AuNPs) that grow individually. A fine-tuning of these parameters leads to an important improvement of the created structures' quality, with a fine control on size and density of AuNSs.

Published
2021

8. Evaluation of CO2storage properties and mobility through NMR technique in post-grafting synthetized organically functionalized porous silica

Author

Simari, Cataldo, Conte, Giuseppe, Lacrămă, Ana-Maria, Nicola, Roxana, Bonaventura, Carlo Poselle, Desiderio, Giovanni, Nicotera, Isabella, Agostino, Raffaele G., and Policicchio, Alfonso

Abstract

Functionalized porous silica materials were synthesized in alkaline conditions by post-grafting method using hexadecyltrimethylammonium bromide (CTAB) as templating agent, tetraethyl orthosilicate (TEOS) as silica precursors and trialkoxysilanes functionalised with different organic groups. Textural features, halfway between microporosity and mesoporosity, combined with the surface physico-chemical ones related to various organic groups, determined different CO2storage properties highlighting a strong interaction with the precursor 3-Aminopropyl)triethoxysilane. NMR spectroscopy also showed how physisorption is the mainstream mechanism for CO2adsorption in all the sorbents, except for the aforementioned organic group in which an important chemisorption contribution occurs. Diffusion and molecular mobility analysis revealed that at least two species coexist within the micro-/meso-pores of the sorbents, namely, CO2molecules powerfully interacting with the pore surface (pore-surface CO2) and “bulk-like” CO2filling the central region of the pores. Furthermore, the post functionalization suppresses the diffusion of CO2molecules through the pore channels with all the functionalized materials exhibiting a single self-diffusion coefficient. On the other side, D// strictly depends on the average pore size of the sorbent.

Published
2024
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12. Experimental Evaluation of the Thermal Polarization in Direct Contact Membrane Distillation Using Electrospun Nanofiber Membranes Doped With Molecular Probes

Author

Santoro, Sergio, primary, Vidorreta, Ivan, additional, Coelhoso, Isabel, additional, Lima, Joao, additional, Desiderio, Giovanni, additional, Lombardo, Giuseppe, additional, Drioli, Enrico, additional, Mallada, Reyes, additional, Crespo, Joao, additional, Criscuoli, Alessandra, additional, and Figoli, Alberto, additional

Published
2019
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