1,793 research outputs found
Supported nanoparticles for catalysis and biomedical applications
No full textIn recent years we have prepared a large variety of stable supported metal nanoparticles by using supports such as silica, alumina, titania, magnetite (hereafter generally termed as Oxides Supports, OS), Indium Tin Oxide (ITO) and hydroxyapatite (HA) to be employed as catalytic systems and biomaterials.
With regards to the OS, we have developed a convenient method for the anchoring of AuNPs on matrices modified with a propynylcarbamate functionality, without the need of any additional reducing and/or stabilizing agents. Among these systems, the Au/SiO2 catalyst was also the most active in the oxidation of a large variety of primary and secondary alcohols both in batch and flow settings (Fig. 1A), yielding very stable performances as a function of time without any detrimental activity degradation [1].
Figure 1.
In the HA case we have reported an easy, green and low-cost method to support AgNPs onto multifunctionalized HA-R crystals (Fig. 1B, R = zoledronate, (9R)-9-hydroxystearate) obtaining materials that combine the biological properties of R with a significant long-standing antibacterial activity [2].
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[1] M. Giorgetti, G. Aquilanti, B. Ballarin, M. Berrettoni, M.C. Cassani, S. Fazzini, D. Nanni, D. Tonelli, Anal. Chem. 2016, 88, 6873; M.C. Cassani, B. Ballarin, D. Barreca, E. Boanini, E. Bonansegna, G. Carraro, S. Fazzini, A. Mignani, D. Nanni, D. Pinelli, RSC Adv. 2016, 6, 25780; B. Ballarin, D. Barreca, E. Boanini, M.C. Cassani, P. Dambruoso, A. Massi, A. Mignani, D. Nanni, C. Parise, A. Zaghi, ACS Sustain. Chem. Eng. 2017, 5, 4746.
[2] E. Boanini, P. Torricelli, C. Boga, G. Micheletti, M.C. Cassani, M. Fini, A. Bigi, Langmuir 2016, 32, 188; E. Boanini, P. Torricelli, F. Bonvicini, M.C. Cassani, M. Fini, G.A. Gentilomi, A. Bigi, Eur. J. Pharm. Biopharm. 2018, 127, 120; E. Boanini, M.C. Cassani, K. Rubini, C. Boga, A. Bigi, Nanomaterials 2018, 8, 390
A subtle and hidden natural hazard: origin, development and evolution of sinkholes
No full textAmong the many geological hazards affecting the Italian territory (earthquakes, volcanic eruptions, slope
movements, floods, wildfires, etc.), and causing severe losses and casualties, sinkholes are rarely considered in
hazard and risk analysis. Nevertheless, their occurrence, with the consequent negative effects on the built-up
environment and human infrastructures, affect large parts of Italy, covering the whole country with a variety of
typologies. Sinkholes mostly occur in karst areas, where soluble rocks such as carbonates and evaporites crop
out or are present at low depth (De Waele et al., 2011). Development of sinkholes, however, may also be
registered in alluvial plains, involving thick sequences of alluvial and colluvial deposits (Fig. 1).
Recently, an effort was produced by the Institute of Research for the Hydrogeological Protection with the
National Research Council of Italy (CNR-IRPI) to build a chronological catalogue on sinkhole phenomena in
Italy, addresses toward the evaluation of the sinkhole hazard (Parise & Vennari, 2013; Parise et al., 2013). The
chronological catalogue of sinkholes is specifically focused on the time of occurrence of the events, that is
considered a crucial element for the definition of the sinkhole hazard. Even though the catalogue takes into
account both natural and anthropogenic sinkholes (these latter being those events related to presence of manmade
underground caves), given the topic of this conference, the present contribution will deal exclusively with
natural sinkholes. Knowledge of the dates of occurrence of sinkholes represents the necessary element for
definition of the hazard; at the same time, discriminating between sinkholes related to presence of natural or
man-made caves may determine very different scenarios to be faced, in terms of civil protection actions.
A sinkhole at the surface appears as punctual (site-located), and typically of limited dimensions. This, however,
does not mean that the affected area is limited to that specific point, since underground the caves responsible for
the event may potentially develop for a much wider extension. With respect to natural sinkholes, these typically
are found in areas with soluble rocks affected by karst processes, or alluvial sediments in peculiar geological
situations. Thus, the zonation of the sinkhole-prone areas may be done for natural sinkholes based solely upon
geology as a first approximation
Integration of surface and subsurface data for the understanding of karst hydrogeology: caves as open windows to the water table
No full textKarst groundwaters are the main hydric supply in many countries of the world (Stevanovic, 2015), and
represent a precious resource to be protected and properly managed. They are extremely vulnerable to
pollution (Goldscheider & Drew, 2007; Ford & Williams, 2007; Parise & Gunn, 2007), since karst landforms
such as sinkholes are the preferential sites for pollutants entry, putting in direct contact the surface with
the vadose zone. Marine intrusion has to be added in coastal areas as a further source of contamination for
water quality (Masciopinto et al., 2017), locally with significant impact on society. A good knowledge of the
geological and hydrogeological features, obtained through collection of lithological, petrographic, structural,
geomorphological and hydrogeological data, is the necessary starting point to plan and develop the best
practices and actions toward protection of underground water resources. In karst, this can be reached through
integration of traditional geological approaches at the surface with direct exploration and surveying within the
caves, by means of speleological techniques (Liso et al., 2019, 2020; Parise et al., 2020). In Apulia, one of the
more extensive karst areas in the Mediterranean Basin, freshwater resources are stored within the fractured
and karstified limestones making up the backbone of the region (Maggiore & Pagliarulo, 2004; Cotecchia,
2014; Liso & Parise, 2020). However, in contrast with the high number of surface sinkholes, dolines and poljes
distributed over the Apulian karst landscape, among the over 2000 caves registered in the Regional Inventory,
only two directly reach the water table. They are therefore a sort of open windows to the water table, ideal sites
where to study hydrogeology. In this contribution we present our efforts, performed through direct explorations
and in cooperation with cavers, to combine surface/subsurface data to enrich the available information about
hydrogeology of Apulian karst systems, and to contribute to a better understanding of its main features
Signal compatibility as a modulatory factor for audiovisual multisensory integration.
No full textParise C. Signal compatibility as a modulatory factor for audiovisual multisensory integration.; 2012
Metaphors in the ear and in the world
No full textParise C. Metaphors in the ear and in the world. Presented at the Experimental Psychology Society, Lancaster
Damage assessment and conservation of underground spaces as valuable resources for human activities in Italy and Japan
No full textThis special issue is the main scientific output of the homonymous bilateral project between Italy and Japan “Damage assessment and conservation of underground spaces as valuable resources for human activities in Italy and Japan”. The project was financed
within the agreement regarding the scientific cooperation between the National Research Council of Italy (CNR) and the Japan Society for the Promotion of Science (JSPS) signed on October 23, 2011. The fund supported mutual scientific exchanges between the teams, which were led by Roberta Varriale from the Institute for Studies on the Mediterranean (ISMed), Italy and by Chiaki T. Oguchi from the Graduate School of Science and Engineering of Saitama University, Japan during the period 2018/2019
Prior entry: A review.
No full textSpence C, Parise C. Prior entry: A review. Consciousness & Cognition. 2010;19(1):364-379
Gold nanoparticles supported on functionalized oxides as catalysts for organic transformations in batch and flow systems
No full textOur research group has previously reported the preparation of gold nanoparticles (AuNPs) anchored on different functionalized silica supports, i.e. commercial polyethyleneimine-functionalized silica beads [1] and silica nanoparticles functionalized with alkynyl carbamate moieties [2].
Moreover, we have recently focused on the straightforward synthesis of AuNPs anchored on commercial, micrometric oxide supports (SiO2, Al2O3, TiO2) previously modified with the di-functional organosilane [3-(2-propynylcarbamate)propyl]triethoxysilane (PPTEOS) by a grafting procedure. After being thoroughly characterized by several complementary techniques (XPS, TEM, SSNMR, AAS etc.), the catalytic activity of these systems (Au/OS@Yne) has been evaluated in the oxidation of alcohols both in batch and continuous-flow systems [3]. Successively, we have carried on with the deposition of AuNPs on organic modified Fe3O4 obtaining an easy recoverable magnetic catalyst. After an extended characterization, the catalytic activity of Au/Fe3O4@Yne has been evaluated in the alkynes hydroamination reaction and the results have been compared with the ones obtained with Au/SiO2@Yne.
References
[1] S. Fazzini , D. Nanni , B. Ballarin , M. C. Cassani , M. Giorgetti , C. Maccato, A. Trapananti, G. Aquilanti and S. I. Ahmed, J. Phys. Chem. C. 116 (2012) 25434−25443; M. Giorgetti, G. Aquilanti, B. Ballarin, M. Berrettoni, M. C. Cassani, S. Fazzini, D. Nanni and D. Tonelli, Anal. Chem. 88 (2016) 6873-6880;
[2] S. Fazzini, M. C. Cassani, B. Ballarin, E. Boanini, J. S. Girardon, A.S. Mamede, A. Mignani and D. Nanni, J. Phys. Chem. C. 118 (2014) 24538-24547; M. C. Cassani, B. Ballarin, D. Barreca, E. Boanini, E. Bonansegna, G. Carraro, S. Fazzini, A. Mignani, D. Nanni, D. Pinelli, RSC Adv. 6 (2016) 25780-25788;
[3] B. Ballarin, D. Barreca, E. Boanini, M. C. Cassani, P. Dambruoso, A. Massi, A. Mignani, D. Nanni, C. Parise, A. Zaghi, ACS Sus. Chem. Eng. 5 (2017) 4746-4756
Montale e Parise. Gli uomini che guardano
No full textIl saggio imposta un confronto intertestuale fra la narrativa di Moravia e quella di Parise, soffermandosi in particolare sulle correlazioni che interessano "L'odore del sangue" e "L'uomo che guarda". Il risultato è un'analisi del modo in cui l'opera di Moravia ha nutrivo quella di Parise, ma anche un'ipotesi su alcune costanti che attraversano diversi 'romanzi dell'intellettuale' tra anni Settanta e Ottanta
Synesthetic congruency modulates the temporal ventriloquism effect
No full textParise C, Spence C. Synesthetic congruency modulates the temporal ventriloquism effect. Neuroscience Letters. 2008;442(3):257-261
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