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  1. Article: Hardening of Nanoporous Au Induced by Exposure to Different Gaseous Environments.

    Pia, Giorgio / Sogne, Elisa / Falqui, Andrea / Delogu, Francesco

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 8

    Abstract: This work focuses on the mechanical behaviour of nanoporous Au samples alternately exposed to ozone and carbon dioxide. Nanoporous Au was fabricated by freely corroding the ... ...

    Abstract This work focuses on the mechanical behaviour of nanoporous Au samples alternately exposed to ozone and carbon dioxide. Nanoporous Au was fabricated by freely corroding the Ag
    Language English
    Publishing date 2022-04-07
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15082718
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Engineering the structural and electrical interplay of nanostructured Au resistive switching networks by controlling the forming process.

    Nadalini, Giacomo / Borghi, Francesca / Košutová, Tereza / Falqui, Andrea / Ludwig, Nicola / Milani, Paolo

    Scientific reports

    2023  Volume 13, Issue 1, Page(s) 19713

    Abstract: Networks of random-assembled gold clusters produced in the gas phase show resistive switching (RS) activity at room temperature and they are suitable for the fabrication of devices for neuromorphic data processing and classification. Fully connected ... ...

    Abstract Networks of random-assembled gold clusters produced in the gas phase show resistive switching (RS) activity at room temperature and they are suitable for the fabrication of devices for neuromorphic data processing and classification. Fully connected cluster-assembled nanostructured Au films are characterized by a granular structure rich of interfaces, grain boundaries and crystalline defects. Here we report a systematic characterization of the electroforming process of the cluster-assembled films demonstrating how this process affects the interplay between the nano- and mesoscale film structure and the neuromorphic characteristics of the resistive switching activity. The understanding and the control of the influence of the resistive switching forming process on the organization of specific structures at different scales of the cluster-assembled films, provide the possibility to engineer random-assembled neuromorphic architectures for data processing task.
    Language English
    Publishing date 2023-11-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-023-46990-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Thermally Promoted Cation Exchange at the Solid State in the Transmission Electron Microscope: How It Actually Works.

    Casu, Alberto / Lopez, Miquel / Melis, Claudio / Deiana, Davide / Li, Hongbo / Colombo, Luciano / Falqui, Andrea

    ACS nano

    2023  Volume 17, Issue 17, Page(s) 17058–17069

    Abstract: Cation exchange offers a strong postsynthetic tool for nanoparticles that are unachievable via direct synthesis, but its velocity makes observing the onset of the reaction in the liquid state almost impossible. After successfully proving that cation ... ...

    Abstract Cation exchange offers a strong postsynthetic tool for nanoparticles that are unachievable via direct synthesis, but its velocity makes observing the onset of the reaction in the liquid state almost impossible. After successfully proving that cation exchange reactions can be triggered, performed, and followed live at the solid state by an
    Language English
    Publishing date 2023-08-28
    Publishing country United States
    Document type Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.3c04516
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Nanoporous Au Behavior in Methyl Orange Solutions.

    Pinna, Andrea / Pia, Giorgio / Melis, Nicola / Prato, Mirko / Cutrufello, Maria Giorgia / Sogne, Elisa / Falqui, Andrea / Pilia, Luca

    Molecules (Basel, Switzerland)

    2024  Volume 29, Issue 9

    Abstract: Nanoporous (NP) gold, the most extensively studied and efficient NP metal, possesses exceptional properties that make it highly attractive for advanced technological applications. Notably, its remarkable catalytic properties in various significant ... ...

    Abstract Nanoporous (NP) gold, the most extensively studied and efficient NP metal, possesses exceptional properties that make it highly attractive for advanced technological applications. Notably, its remarkable catalytic properties in various significant reactions hold enormous potential. However, the exploration of its catalytic activity in the degradation of water pollutants remains limited. Nevertheless, previous research has reported the catalytic activity of NP Au in the degradation of methyl orange (MO), a toxic azo dye commonly found in water. This study aims to investigate the behavior of nanoporous gold in MO solutions using UV-Vis absorption spectroscopy and high-performance liquid chromatography. The NP Au was prepared by chemical removal of silver atoms of an AuAg precursor alloy prepared by ball milling. Immersion tests were conducted on both pellets and powders of NP Au, followed by examination of the residual solutions. Additionally, X-ray photoelectron spectroscopy and electrochemical impedance measurements were employed to analyze NP Au after the tests. The findings reveal that the predominant and faster process involves the partially reversible adsorption of MO onto NP Au, while the catalytic degradation of the dye plays a secondary and slower role in this system.
    Language English
    Publishing date 2024-04-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules29091950
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  5. Article: Estimation of Nanoporous Au Young's Modulus from Serial Block Face-SEM 3D-Characterisation.

    Brun, Michele / Sogne, Elisa / Falqui, Andrea / Scaglione, Federico / Rizzi, Paola / Delogu, Francesco / Pia, Giorgio

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 10

    Abstract: Nanoporous Au has been subjected to serial block face-scanning electron microscopy (SBF-SEM) 3D-characterisation. Corresponding sections have been digitalized and used to evaluate the associated mechanical properties. Our investigation demonstrates that ... ...

    Abstract Nanoporous Au has been subjected to serial block face-scanning electron microscopy (SBF-SEM) 3D-characterisation. Corresponding sections have been digitalized and used to evaluate the associated mechanical properties. Our investigation demonstrates that the sample is homogeneous and isotropic. The effective Young's modulus estimated by an analytical multiscale approach agrees remarkably well with the values stated in the literature.
    Language English
    Publishing date 2022-05-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15103644
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Surface Compositional Change of Iron Oxide Porous Nanorods: A Route for Tuning their Magnetic Properties.

    Casu, Alberto / Loche, Danilo / Lentijo-Mozo, Sergio / Falqui, Andrea

    Molecules (Basel, Switzerland)

    2020  Volume 25, Issue 5

    Abstract: The capability of synthesizing specific nanoparticles (NPs) by varying their shape, size and composition in a controlled fashion represents a typical set of engineering tools that tune the NPs magnetic response via their anisotropy. In particular, ... ...

    Abstract The capability of synthesizing specific nanoparticles (NPs) by varying their shape, size and composition in a controlled fashion represents a typical set of engineering tools that tune the NPs magnetic response via their anisotropy. In particular, variations in NP composition mainly affect the magnetocrystalline anisotropy component, while the different magnetic responses of NPs with isotropic (i.e., spherical) or elongated shapes are mainly caused by changes in their shape anisotropy. In this context, we propose a novel route to obtain monodispersed, partially hollow magnetite nanorods (NRs) by colloidal synthesis, in order to exploit their shape anisotropy to increase the related coercivity; we then modify their composition via a cation exchange (CE) approach. The combination of a synthetic and post-synthetic approach on NRs gave rise to dramatic variations in their magnetic features, with the pores causing an initial magnetic hardening that was further enhanced by the post-synthetic introduction of a manganese oxide shell. Indeed, the coupling of the core and shell ferrimagnetic phases led to even harder magnetic NRs.
    MeSH term(s) Anisotropy ; Ferric Compounds/chemistry ; Magnetics ; Magnetite Nanoparticles/chemistry ; Manganese Compounds ; Nanotubes/chemistry ; Oxides ; Particle Size ; Porosity ; Surface Properties
    Chemical Substances Ferric Compounds ; Magnetite Nanoparticles ; Manganese Compounds ; Oxides ; ferric oxide (1K09F3G675) ; manganese oxide (64J2OA7MH3)
    Language English
    Publishing date 2020-03-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules25051234
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  7. Article: Crystallization of TiO₂ Nanotubes by In Situ Heating TEM.

    Casu, Alberto / Lamberti, Andrea / Stassi, Stefano / Falqui, Andrea

    Nanomaterials (Basel, Switzerland)

    2018  Volume 8, Issue 1

    Abstract: The thermally-induced crystallization of anodically grown TiO₂ amorphous nanotubes has been studied so far under ambient pressure conditions by techniques such as differential scanning calorimetry ... ...

    Abstract The thermally-induced crystallization of anodically grown TiO₂ amorphous nanotubes has been studied so far under ambient pressure conditions by techniques such as differential scanning calorimetry and
    Language English
    Publishing date 2018-01-14
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano8010040
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  8. Article ; Online: Ag surface segregation in nanoporous Au catalysts during CO oxidation.

    Pia, Giorgio / Sogne, Elisa / Falqui, Andrea / Delogu, Francesco

    Scientific reports

    2018  Volume 8, Issue 1, Page(s) 15208

    Abstract: The present study focuses on the modification of surface compositional profiles induced in nanoporous (NP) Au catalysts by the catalytic oxidation of carbon monoxide to carbon dioxide in the presence of oxygen. The phenomenon has deep implications ... ...

    Abstract The present study focuses on the modification of surface compositional profiles induced in nanoporous (NP) Au catalysts by the catalytic oxidation of carbon monoxide to carbon dioxide in the presence of oxygen. The phenomenon has deep implications concerning the catalytic behavior of NP Au foams in particular, and more in general for the design of more efficient catalysts. Aimed at gaining deeper insight into the mechanisms governing surface segregation, we exposed NP Au foams containing residual Ag to a mixture of gaseous carbon monoxide and oxygen at different temperature. Structural and surface composition analyses pointed out the concomitant occurrence of both NP Au coarsening and Ag surface segregation processes. Experimental findings suggest for Ag surface segregation a two-stage kinetics. During the initial, rapid coarsening of the NP Au structure, Ag surface segregation is mediated by surface rearrangements, which allow the Ag atoms to reach the surface at anomalously fast rate. As coarsening decelerates, the slower diffusion of buried Ag atoms towards the surface predominates, due to favorable chemical interactions with adsorbed oxygen. This novel mechanism's understanding can benefit strategic areas of science and technology.
    Language English
    Publishing date 2018-10-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-018-33631-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Synthesis and Characterization of Gd-Functionalized B

    Vitali, Agostina / Demichelis, Maria Paola / Di Martino, Greta / Postuma, Ian / Bortolussi, Silva / Falqui, Andrea / Milanese, Chiara / Ferrara, Chiara / Sommi, Patrizia / Anselmi-Tamburini, Umberto

    Life (Basel, Switzerland)

    2023  Volume 13, Issue 2

    Abstract: Inorganic nanoparticles of boron-rich compounds represent an attractive alternative to boron-containing molecules, such as boronophenylalanine or boranes, for BNCT applications. This work describes the synthesis and biological activity of multifunctional ...

    Abstract Inorganic nanoparticles of boron-rich compounds represent an attractive alternative to boron-containing molecules, such as boronophenylalanine or boranes, for BNCT applications. This work describes the synthesis and biological activity of multifunctional boron carbide nanoparticles stabilized with polyacrylic acid (PAA) and a gadolinium (
    Language English
    Publishing date 2023-02-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662250-6
    ISSN 2075-1729
    ISSN 2075-1729
    DOI 10.3390/life13020429
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Magnetic Study of CuFe

    Gaumet, Alizé V / Caddeo, Francesco / Loche, Danilo / Corrias, Anna / Casula, Maria F / Falqui, Andrea / Casu, Alberto

    Nanomaterials (Basel, Switzerland)

    2021  Volume 11, Issue 10

    Abstract: ... ...

    Abstract CuFe
    Language English
    Publishing date 2021-10-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano11102680
    Database MEDical Literature Analysis and Retrieval System OnLINE

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