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Dive into the research topics where Federico Bertasi is active.

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Featured researches published by Federico Bertasi.


Microvascular Research | 2015

Evaluation of gold nanoparticles toxicity towards human endothelial cells under static and flow conditions.

Caterina Fede; Ilaria Fortunati; Verena Weber; Nicola Rossetto; Federico Bertasi; Lucia Petrelli; Diego Guidolin; Raffaella Signorini; Raffaele De Caro; Giovanna Albertin; Camilla Ferrante

A new in vitro model system, adding advection and shear stress associated with a flowing medium, is proposed for the investigation of nanoparticles uptake and toxicity towards endothelial cells, since these processes are normally present when nanoparticles formulations are intravenously administered. In this model system, mechanical forces normally present in vivo, such as advection and shear stress were applied and carefully controlled by growing human umbilical vein endothelial cells inside a microfluidic device and continuously infusing gold nanoparticle (Au NPs) solution in the device. The tests performed in the microfluidic device were also run in multiwells, where no flow is present, so as to compare the two model systems and evaluate if gold nanoparticles toxicity differs under static and flow culture conditions. Full characterization of Au NPs in water and in culture medium was accomplished by standard methods. Two-photon fluorescence correlation spectroscopy was also employed to map the flow speed of Au NPs in the microfluidic device and characterize Au NPs before and after interactions with the cells. Au NPs uptake in both in vitro systems was investigated through electron and fluorescence microscopy and ICP-AES, and NPs toxicity measured through standard bio-analytical tests. Comparison between experiments run in multiwells and in microfluidic device plays a pivotal role for the investigation of nanoparticle-cell interaction and toxicity assessment: our work showed that administration of equal concentrations of Au NPs under flow conditions resulted in a reduced sedimentation of nanoparticle aggregates onto the cells and lower cytotoxicity with respect to experiments run in ordinary static conditions (multiwells).


Chemsuschem | 2015

A Key concept in Magnesium Secondary Battery Electrolytes.

Federico Bertasi; Chaminda Hettige; Fatemeh Sepehr; Xavier Bogle; Gioele Pagot; Keti Vezzù; Enrico Negro; Stephen J. Paddison; Steve Greenbaum; Michele Vittadello; Vito Di Noto

A critical roadblock toward practical Mg-based energy storage technologies is the lack of reversible electrolytes that are safe and electrochemically stable. Here, we report on high-performance electrolytes based on 1-ethyl-3-methylimidazolium chloride (EMImCl) doped with AlCl3 and highly amorphous δ-MgCl2 . The phase diagram of the electrolytes reveals the presence of four thermal transitions that strongly depend on salt content. High-level density functional theory (DFT)-based electronic structure calculations substantiate the structural and vibrational assignment of the coordination complexes. A 3D chloride-concatenated dynamic network model accounts for the outstanding redox behaviour and the electric and magnetic properties, providing insight into the conduction mechanism of the electrolytes. Mg anode cells assembled using the electrolytes were cyclically discharged at a high rate (35 mA g(-1) ), exhibiting an initial capacity of 80 mA h g(-1) and a steady-state voltage of 2.3 V.


Chemsuschem | 2013

Molecular Relaxations in Magnesium Polymer Electrolytes via GHz Broadband Electrical Spectroscopy

Michele Piccolo; Guinevere A. Giffin; Keti Vezzù; Federico Bertasi; Piergiorgio Alotto; Massimo Guarnieri; Vito Di Noto

GHz broadband electrical spectroscopy (G-BES) is adopted to investigate the molecular relaxations and interactions occurring within the system in an oxygen- and water-free atmosphere in the 300 kHz-20 GHz and -40 to 250 °C frequency and temperature ranges, respectively. A new electrolyte for magnesium secondary batteries that can transfer magnesium ions efficiently is presented. This electrolyte is based on polyethylene glycol 400 and a polymeric form of δ-MgCl2 . The information obtained by G-BES is crucial for studying the conduction mechanism of these new electrolytes.


Chemistry of Materials | 2018

Toward Pt-Free Anion-Exchange Membrane Fuel Cells: Fe–Sn Carbon Nitride–Graphene Core–Shell Electrocatalysts for the Oxygen Reduction Reaction

Enrico Negro; Antoine Bach Delpeuch; Keti Vezzù; Graeme Nawn; Federico Bertasi; Alberto Ansaldo; Vittorio Pellegrini; Beata Dembinska; Sylwia Zoladek; Krzysztof Miecznikowski; Iwona A. Rutkowska; Magdalena Skunik-Nuckowska; Pawel J. Kulesza; Francesco Bonaccorso; Vito Di Noto

We report on the development of two new Pt-free electrocatalysts (ECs) for the oxygen reduction reaction (ORR) process based on graphene nanoplatelets (GNPs). We designed the ECs with a core–shell morphology, where a GNP core support is covered by a carbon nitride (CN) shell. The proposed ECs present ORR active sites that are not associated with nanoparticles of metal/alloy/oxide but are instead based on Fe and Sn subnanometric clusters bound in coordination nests formed by carbon and nitrogen ligands of the CN shell. The performance and reaction mechanism of the ECs in the ORR are evaluated in an alkaline medium by cyclic voltammetry with the thin-film rotating ring-disk approach and confirmed by measurements on gas-diffusion electrodes. The proposed GNP-supported ECs present an ORR overpotential of only ca. 70 mV higher with respect to a conventional Pt/C reference EC including a XC-72R carbon black support. These results make the reported ECs very promising for application in anion-exchange membrane fu...


Journal of the American Chemical Society | 2018

Interplay Between Hydroxyl Density and Relaxations in Poly(vinylbenzyltrimethylammonium)-b-poly(methylbutylene) Membranes for Electrochemical Applications

Keti Vezzù; Ashley M Maes; Federico Bertasi; Andrew R Motz; Tsung-Han Tsai; E. Bryan Coughlin; Andrew M. Herring; Vito Di Noto

Anion-exchange membranes (AEMs) consisting of poly(vinyl benzyl trimethylammonium)-b-poly(methylbutylene) of three different ion exchange capacities (IECs), 1.14, 1.64, and 2.03 mequiv g-1, are studied by High-Resolution Thermogravimetry, Modulated Differential Scanning Calorimetry, Dynamic Mechanical Analysis, and Broadband Electrical Spectroscopy in their OH- form. The thermal stability and transitions are elucidated, showing a low temperature Tg and a higher temperature transition assigned to a disorder-order transition, Tδ, which depends on the IEC of the material. The electric response is analyzed in detail, allowing the identification of three polarizations (only two of which contribute significantly to the overall conductivity, σEP and σIP,1) and two dielectric relaxation events (β1 and β2), one associated with the tolyl side groups (β1) and one with the cationic side chains (β2). The obtained results are integrated in a coherent picture and a conductivity mechanism is proposed, involving two distinct conduction pathways, σEP and σIP,1. Importantly, we observed a reordering of the ion pair dipoles which is responsible for the Tδ at temperatures higher than 20 °C, which results in a dramatic decrease of the ionic conductivity. Clustering is highly implicated in the higher IEC membrane in the hydroxyl form, which reduces the efficiency of the anionic transport.


ChemElectroChem | 2014

Interplay between Nitrogen Concentration, Structure, Morphology, and Electrochemical Performance of PdCoNi “Core–Shell” Carbon Nitride Electrocatalysts for the Oxygen Reduction Reaction

Enrico Negro; Keti Vezzù; Federico Bertasi; Piero Schiavuta; Luigi Toniolo; Stefano Polizzi; Vito Di Noto


The Electrochemical Society interface | 2015

Origins, Developments, and Perspectives of Carbon Nitride-Based Electrocatalysts for Application in Low-Temperature FCs

Vito Di Noto; Enrico Negro; Keti Vezzù; Federico Bertasi; Graeme Nawn


International Journal of Hydrogen Energy | 2012

Hybrid inorganic-organic nanocomposite polymer electrolytes based on Nafion and fluorinated TiO2 for PEMFCs

Vito Di Noto; Mauro Bettiol; Fabio Bassetto; Nicola Boaretto; Enrico Negro; Sandra Lavina; Federico Bertasi


Electrochimica Acta | 2016

Fe-carbon nitride "Core-shell" electrocatalysts for the oxygen reduction reaction

Keti Vezzù; Antoine Bach Delpeuch; Enrico Negro; Stefano Polizzi; Graeme Nawn; Federico Bertasi; Gioele Pagot; Kateryna Artyushkova; Plamen Atanassov; Vito Di Noto


Electrochimica Acta | 2015

Single-Ion-Conducting Nanocomposite Polymer Electrolytes for Lithium Batteries Based on Lithiated-Fluorinated-Iron Oxide and Poly(ethylene glycol) 400

Federico Bertasi; Enrico Negro; Keti Vezzù; Graeme Nawn; Gioele Pagot; Vito Di Noto

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