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Pasquini L, Sauvan M, Narducci R, Sgreccia E, Knauth P, Di Vona ML. Improved Hydrolytic and Mechanical Stability of Sulfonated Aromatic Proton Exchange Membranes Reinforced by Electrospun PPSU Fibers. Membranes (Basel) 2022; 12:1159. [PMID: 36422151 PMCID: PMC9696324 DOI: 10.3390/membranes12111159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 10/28/2022] [Accepted: 11/10/2022] [Indexed: 06/16/2023]
Abstract
The hydrolytic stability of ionomer membranes is a matter of concern for the long-term durability of energy storage and conversion devices. Various reinforcement strategies exist for the improvement of the performances of the overall membrane. We propose in this article the stabilization of membranes based on aromatic ion conducting polymers (SPEEK and SPPSU) by the introduction of an electrospun mat of inexpensive PPSU polymer. Characterization data from hydrolytic stability (mass uptake and dimension change) and from mechanical and conductivity measurements show an improved stability of membranes in phosphate buffer, used for enzymatic fuel cells, and in distilled water. The synergistic effect of the reinforcement, together with the casting solvent and the thermal treatment or blending polymers, is promising for the realization of high stability ionomer membranes.
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Affiliation(s)
- Luca Pasquini
- CNRS, MADIREL UMR 7246 (ELMA Team) and International Laboratory “Ionomer Materials for Energy” (LIME), Aix-Marseille University, 13013 Marseille, France
| | - Maxime Sauvan
- CNRS, MADIREL UMR 7246 (ELMA Team) and International Laboratory “Ionomer Materials for Energy” (LIME), Aix-Marseille University, 13013 Marseille, France
| | - Riccardo Narducci
- International Laboratory “Ionomer Materials for Energy” (LIME), Department of Industrial Engineering, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Emanuela Sgreccia
- International Laboratory “Ionomer Materials for Energy” (LIME), Department of Industrial Engineering, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Philippe Knauth
- CNRS, MADIREL UMR 7246 (ELMA Team) and International Laboratory “Ionomer Materials for Energy” (LIME), Aix-Marseille University, 13013 Marseille, France
| | - Maria Luisa Di Vona
- International Laboratory “Ionomer Materials for Energy” (LIME), Department of Industrial Engineering, University of Rome Tor Vergata, 00133 Rome, Italy
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Narducci R, Becerra-Arciniegas RA, Pasquini L, Ercolani G, Knauth P, Di Vona ML. Anion-Conducting Polymer Electrolyte without Ether Linkages and with Ionic Groups Grafted on Long Side Chains: Poly(Alkylene Biphenyl Butyltrimethyl Ammonium) (ABBA). Membranes 2022; 12:membranes12030337. [PMID: 35323811 PMCID: PMC8956100 DOI: 10.3390/membranes12030337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/12/2022] [Accepted: 03/15/2022] [Indexed: 11/16/2022]
Abstract
In this work we report the synthesis of the new ionomer poly(alkylene biphenyl butyltrimethyl ammonium) (ABBA) with a backbone devoid of alkaline-labile C-O-C bonds and with quaternary ammonium groups grafted on long side chains. The ionomer was achieved by metalation reaction with n-butyllithium of 2-bromobiphenyl, followed by the introduction of the long chain with 1,4-dibromobutane. The reaction steps were followed by 1H-NMR spectroscopy showing the characteristic signals of the Br-butyl chain and indicating the complete functionalization of the biphenyl moiety. The precursor was polycondensed with 1,1,1-trifluoroacetone and then quaternized using trimethylamine (TMA). After the acid catalyzed polycondensation, the stoichiometric ratio between the precursors was respected. The quaternization with TMA gave a final degree of amination of 0.83 in agreement with the thermogravimetric analysis and with the ion exchange capacity of 2.5 meq/g determined by acid–base titration. The new ionomer blended with poly(vinylalcohol) (PVA) or poly(vinylidene difluoride) (PVDF) was also characterized by water uptake (WU) and ionic conductivity measurements. The higher water uptake and ionic conductivity observed with the PVDF blend might be related to a better nanophase separation.
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Affiliation(s)
- Riccardo Narducci
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy; (R.A.B.-A.); (M.L.D.V.)
- Correspondence:
| | - Raul Andres Becerra-Arciniegas
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy; (R.A.B.-A.); (M.L.D.V.)
- CNRS, MADIREL (UMR 7246) and International Laboratory “Ionomer Materials for Energy”, Aix-Marseille University, Campus St Jérôme, 13013 Marseille, France; (L.P.); (P.K.)
| | - Luca Pasquini
- CNRS, MADIREL (UMR 7246) and International Laboratory “Ionomer Materials for Energy”, Aix-Marseille University, Campus St Jérôme, 13013 Marseille, France; (L.P.); (P.K.)
| | - Gianfranco Ercolani
- Department of Chemical Sciences and Technologies, Via della Ricerca Scientifica, University of Rome Tor Vergata, 00133 Roma, Italy;
| | - Philippe Knauth
- CNRS, MADIREL (UMR 7246) and International Laboratory “Ionomer Materials for Energy”, Aix-Marseille University, Campus St Jérôme, 13013 Marseille, France; (L.P.); (P.K.)
| | - Maria Luisa Di Vona
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy; (R.A.B.-A.); (M.L.D.V.)
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Becerra-Arciniegas RA, Narducci R, Ercolani G, Pasquini L, Knauth P, Di Vona ML. Aliphatic Anion Exchange Ionomers with Long Spacers and No Ether Links by Ziegler-Natta Polymerization: Properties and Alkaline Stability. Molecules 2022; 27:395. [PMID: 35056709 PMCID: PMC8780620 DOI: 10.3390/molecules27020395] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 12/27/2021] [Accepted: 01/06/2022] [Indexed: 12/05/2022] Open
Abstract
In this work we report the synthesis of poly(vinylbenzylchloride-co-hexene) copolymer grafted with N,N-dimethylhexylammonium groups to study the effect of an aliphatic backbone without ether linkage on the ionomer properties. The copolymerization was achieved by the Ziegler-Natta method, employing the complex ZrCl4 (THF)2 as a catalyst. A certain degree of crosslinking with N,N,N',N'-tetramethylethylenediamine (TEMED) was introduced with the aim of avoiding excessive swelling in water. The resulting anion exchange polymers were characterized by 1H-NMR, FTIR, TGA, and ion exchange capacity (IEC) measurements. The ionomers showed good alkaline stability; after 72 h of treatment in 2 M KOH at 80 °C the remaining IEC of 76% confirms that ionomers without ether bonds are less sensitive to a SN2 attack and suggests the possibility of their use as a binder in a fuel cell electrode formulation. The ionomers were also blended with polyvinyl alcohol (PVA) and crosslinked with glutaraldehyde. The water uptake of the blend membranes was around 110% at 25 °C. The ionic conductivity at 25 °C in the OH- form was 29.5 mS/cm.
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Affiliation(s)
- Raul Andres Becerra-Arciniegas
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy;
- Aix-Marseille Univ, CNRS, MADIREL (UMR 7246) and International Laboratory “Ionomer Materials for Energy”, Campus St Jérôme, 13013 Marseille, France; (L.P.); (P.K.)
| | - Riccardo Narducci
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy;
| | - Gianfranco Ercolani
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Roma, Italy;
| | - Luca Pasquini
- Aix-Marseille Univ, CNRS, MADIREL (UMR 7246) and International Laboratory “Ionomer Materials for Energy”, Campus St Jérôme, 13013 Marseille, France; (L.P.); (P.K.)
| | - Philippe Knauth
- Aix-Marseille Univ, CNRS, MADIREL (UMR 7246) and International Laboratory “Ionomer Materials for Energy”, Campus St Jérôme, 13013 Marseille, France; (L.P.); (P.K.)
| | - Maria Luisa Di Vona
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Roma, Italy;
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Narducci R, Sgreccia E, Knauth P, Di Vona ML. Anion Exchange Membranes with 1D, 2D and 3D Fillers: A Review. Polymers (Basel) 2021; 13:3887. [PMID: 34833189 PMCID: PMC8622584 DOI: 10.3390/polym13223887] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/05/2021] [Accepted: 11/08/2021] [Indexed: 11/30/2022] Open
Abstract
Hydroxide exchange membrane fuel cells (AEMFC) are clean energy conversion devices that are an attractive alternative to the more common proton exchange membrane fuel cells (PEMFCs), because they present, among others, the advantage of not using noble metals like platinum as catalysts for the oxygen reduction reaction. The interest in this technology has increased exponentially over the recent years. Unfortunately, the low durability of anion exchange membranes (AEM) in basic conditions limits their use on a large scale. We present in this review composite AEM with one-dimensional, two-dimensional and three-dimensional fillers, an approach commonly used to enhance the fuel cell performance and stability. The most important filler types, which are discussed in this review, are carbon and titanate nanotubes, graphene and graphene oxide, layered double hydroxides, silica and zirconia nanoparticles. The functionalization of the fillers is the most important key to successful property improvement. The recent progress of mechanical properties, ionic conductivity and FC performances of composite AEM is critically reviewed.
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Affiliation(s)
- Riccardo Narducci
- Department Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, I-00133 Rome, Italy; (E.S.); (M.L.D.V.)
| | - Emanuela Sgreccia
- Department Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, I-00133 Rome, Italy; (E.S.); (M.L.D.V.)
| | - Philippe Knauth
- CNRS, Madirel (UMR 7246) and International Laboratory “Ionomer Materials for Energy”, Aix Marseille University, F-13013 Marseille, France;
| | - Maria Luisa Di Vona
- Department Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, I-00133 Rome, Italy; (E.S.); (M.L.D.V.)
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Sgreccia E, Narducci R, Knauth P, Di Vona ML. Silica Containing Composite Anion Exchange Membranes by Sol-Gel Synthesis: A Short Review. Polymers (Basel) 2021; 13:polym13111874. [PMID: 34200025 PMCID: PMC8200225 DOI: 10.3390/polym13111874] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 05/30/2021] [Accepted: 06/01/2021] [Indexed: 11/29/2022] Open
Abstract
This short review summarizes the literature on composite anion exchange membranes (AEM) containing an organo-silica network formed by sol–gel chemistry. The article covers AEM for diffusion dialysis (DD), for electrochemical energy technologies including fuel cells and redox flow batteries, and for electrodialysis. By applying a vast variety of organically modified silica compounds (ORMOSIL), many composite AEM reported in the last 15 years are based on poly (vinylalcohol) (PVA) or poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) used as polymer matrix. The most stringent requirements are high permselectivity and water flux for DD membranes, while high ionic conductivity is essential for electrochemical applications. Furthermore, the alkaline stability of AEM for fuel cell applications remains a challenging problem that is not yet solved. Possible future topics of investigation on composite AEM containing an organo-silica network are also discussed.
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Affiliation(s)
- Emanuela Sgreccia
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, I-00133 Rome, Italy; (R.N.); (M.L.D.V.)
- Correspondence:
| | - Riccardo Narducci
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, I-00133 Rome, Italy; (R.N.); (M.L.D.V.)
| | - Philippe Knauth
- CNRS, Madirel (UMR 7246) and International Laboratory “Ionomer Materials for Energy”, Aix Marseille University, F-13013 Marseille, France;
| | - Maria Luisa Di Vona
- Department of Industrial Engineering and International Laboratory “Ionomer Materials for Energy”, University of Rome Tor Vergata, I-00133 Rome, Italy; (R.N.); (M.L.D.V.)
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Pasquini L, Zhakisheva B, Sgreccia E, Narducci R, Di Vona ML, Knauth P. Stability of Proton Exchange Membranes in Phosphate Buffer for Enzymatic Fuel Cell Application: Hydration, Conductivity and Mechanical Properties. Polymers (Basel) 2021; 13:polym13030475. [PMID: 33540921 PMCID: PMC7867367 DOI: 10.3390/polym13030475] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 01/26/2021] [Accepted: 01/27/2021] [Indexed: 11/16/2022] Open
Abstract
Proton-conducting ionomers are widespread materials for application in electrochemical energy storage devices. However, their properties depend strongly on operating conditions. In bio-fuel cells with a separator membrane, the swelling behavior as well as the conductivity need to be optimized with regard to the use of buffer solutions for the stability of the enzyme catalyst. This work presents a study of the hydrolytic stability, conductivity and mechanical behavior of different proton exchange membranes based on sulfonated poly(ether ether ketone) (SPEEK) and sulfonated poly(phenyl sulfone) (SPPSU) ionomers in phosphate buffer solution. The results show that the membrane stability can be adapted by changing the casting solvent (DMSO, water or ethanol) and procedures, including a crosslinking heat treatment, or by blending the two ionomers. A comparison with NafionTM shows the different behavior of this ionomer versus SPEEK membranes.
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Affiliation(s)
- Luca Pasquini
- CNRS, MADIREL (UMR 7246) and International Laboratory: Ionomer Materials for Energy, Aix Marseille Univ, Campus St. Jérôme, 13013 Marseille, France; (B.Z.); (P.K.)
- Correspondence:
| | - Botagoz Zhakisheva
- CNRS, MADIREL (UMR 7246) and International Laboratory: Ionomer Materials for Energy, Aix Marseille Univ, Campus St. Jérôme, 13013 Marseille, France; (B.Z.); (P.K.)
| | - Emanuela Sgreccia
- Department Industrial Engineering and International Laboratory: Ionomer Materials for Energy, University of Rome Tor Vergata, 00133 Roma, Italy; (E.S.); (R.N.); (M.L.D.V.)
| | - Riccardo Narducci
- Department Industrial Engineering and International Laboratory: Ionomer Materials for Energy, University of Rome Tor Vergata, 00133 Roma, Italy; (E.S.); (R.N.); (M.L.D.V.)
| | - Maria Luisa Di Vona
- Department Industrial Engineering and International Laboratory: Ionomer Materials for Energy, University of Rome Tor Vergata, 00133 Roma, Italy; (E.S.); (R.N.); (M.L.D.V.)
| | - Philippe Knauth
- CNRS, MADIREL (UMR 7246) and International Laboratory: Ionomer Materials for Energy, Aix Marseille Univ, Campus St. Jérôme, 13013 Marseille, France; (B.Z.); (P.K.)
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Lufrano E, Simari C, Di Vona ML, Nicotera I, Narducci R. How the Morphology of Nafion-Based Membranes Affects Proton Transport. Polymers (Basel) 2021; 13:359. [PMID: 33499321 PMCID: PMC7865616 DOI: 10.3390/polym13030359] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 01/15/2021] [Accepted: 01/18/2021] [Indexed: 11/17/2022] Open
Abstract
This work represents a systematic and in-depth study of how Nafion 1100 membrane preparation procedures affect both the morphology of the polymeric film and the proton transport properties of the electrolyte. The membrane preparation procedure has non-negligible consequences on the performance of the proton-exchange membrane fuel cells (PEMFC) that operate within a wide temperature range (up to 120 °C). A comparison between commercial membranes (Nafion 117 and Nafion 212) and Nafion membranes prepared by three different procedures, namely (a) Nafion-recast, (b) Nafion uncrystallized, and (c) Nafion 117-oriented, was conducted. Electrochemical Impedance Spectroscopy (EIS) and Pulsed-field gradient nuclear magnetic resonance (PFG-NMR) investigations indicated that an anisotropic morphology could be achieved when a Nafion 117 membrane was forced to expand between two fixed and nondeformable surfaces. This anisotropy increased from ~20% in the commercial membrane up to 106% in the pressed membrane, where the ionic clusters were averagely oriented (Nafion 117-oriented) parallel to the surface, leading to a strong directionality in proton transport. Among the membranes obtained by solution-cast, which generally exhibited isotropic proton transport behavior, the Nafion uncrystallized membrane showed the lowest water diffusion coefficients and conductivities, highlighting the correlation between low crystallinity and a more branched and tortuous structure of hydrophilic channels. Finally, the dynamic mechanical analysis (DMA) tests demonstrated the poor elastic modulus for both uncrystallized and oriented membranes, which should be avoided in high-temperature fuel cells.
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Affiliation(s)
- Ernestino Lufrano
- Department of Chemistry and Chemical Technologies—CTC, University of Calabria, via Pietro Bucci, 87036 Arcavacata di Rende, Italy; (E.L.); (C.S.)
| | - Cataldo Simari
- Department of Chemistry and Chemical Technologies—CTC, University of Calabria, via Pietro Bucci, 87036 Arcavacata di Rende, Italy; (E.L.); (C.S.)
| | - Maria Luisa Di Vona
- Department of Industrial Engineering and LIME Laboratory, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy;
| | - Isabella Nicotera
- Department of Chemistry and Chemical Technologies—CTC, University of Calabria, via Pietro Bucci, 87036 Arcavacata di Rende, Italy; (E.L.); (C.S.)
| | - Riccardo Narducci
- Department of Industrial Engineering and LIME Laboratory, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy;
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Kaciulis S, Bolli E, Varone A, Richetta M, Narducci R, Di Vona M, Ciotta E, Pizzoferrato R. Adsorption of heavy metals by layered double hydroxides grown in situ on Al foam. SURF INTERFACE ANAL 2020. [DOI: 10.1002/sia.6856] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- S. Kaciulis
- Institute for the Study of Nanostructured Materials, ISMN‐CNR Rome Italy
| | - E. Bolli
- Institute for the Study of Nanostructured Materials, ISMN‐CNR Rome Italy
- Department of Industrial Engineering University of Rome Tor Vergata Rome Italy
| | - A. Varone
- Department of Industrial Engineering University of Rome Tor Vergata Rome Italy
| | - M. Richetta
- Department of Industrial Engineering University of Rome Tor Vergata Rome Italy
| | - R. Narducci
- Department of Industrial Engineering University of Rome Tor Vergata Rome Italy
| | - M.L. Di Vona
- Department of Industrial Engineering University of Rome Tor Vergata Rome Italy
| | - E. Ciotta
- Department of Industrial Engineering University of Rome Tor Vergata Rome Italy
| | - R. Pizzoferrato
- Department of Industrial Engineering University of Rome Tor Vergata Rome Italy
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Liccardi G, Calzetta L, Berra A, Caiazzo R, Califano F, Ciccarelli A, Cutajar M, D'Amato M, De Bartolomeis F, Dello Iacono I, Gargano D, Lo Schiavo M, Madonna F, Maniscalco M, Milanese M, Montera C, Narducci R, Papa G, Pedicini A, Sabatino G, Sacerdoti C, Savoia A, Stanziola A, Bilò MB, Rogliani P. Unmet needs and relationship between general practitioners (GPs) and allergists living in Campania region (southern Italy). Eur Ann Allergy Clin Immunol 2020; 52:230-234. [PMID: 32374559 DOI: 10.23822/eurannaci.1764-1489.127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- G Liccardi
- Department of Pulmonology, Haematology and Oncology. Division of Pulmonology. Unit of Allergology, High Speciality A.Cardarelli Hospital, Naples, Italy.,Postgraduate School of Respiratory Medicine, Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy
| | - L Calzetta
- Postgraduate School of Respiratory Medicine, Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy.,Department of Experimental Medicine, Unit of Respiratory Medicine University of Rome, Tor Vergata, Rome, Italy
| | - A Berra
- Respiratory Allergy Unit. G. Da Procida Hospital, Salerno, Italy
| | - R Caiazzo
- Allergy Unit, ASL (Sanitary District n°12), Caserta, Italy
| | - F Califano
- Allergy and Clinical Immunology, G. Fucito, Hospital and University Hospital, Salerno, Italy
| | - A Ciccarelli
- Allergy Unit, Presidio Sanitario Polispecialistico Loreto Crispi Naples, Italy
| | - M Cutajar
- Allergy Center, Division of Internal Medicine. Ospedali Riuniti Penisola Sorrentina, Sorrento, Naples, Italy
| | - M D'Amato
- Department of Respiratory Disease, Federico II University AO Dei Colli, Naples, Italy
| | - F De Bartolomeis
- Allergy Unit. High Speciality San Giuseppe Moscati Hospital, Avellino, Italy
| | - I Dello Iacono
- Unit of Allergology. Division of Internal Medicine, Fatebenefratelli Hospital, Benevento, Italy
| | - D Gargano
- Allergy Unit. High Speciality San Giuseppe Moscati Hospital, Avellino, Italy
| | - M Lo Schiavo
- Allergy and Clinical Immunology, G. Fucito, Hospital and University Hospital, Salerno, Italy
| | - F Madonna
- Allergy Unit. ASL (Sanitary District n°12), Caserta, Italy
| | - M Maniscalco
- Pulmonary Rehabilitation Unit ICS Maugeri Telese Terme, Benevento, Italy
| | - M Milanese
- Division of Pulmonology, S.Corona Hospital, Pietra Ligure, Savona, Italy
| | - C Montera
- Allergy and Clinical Immunology, G. Fucito, Hospital and University Hospital, Salerno, Italy
| | - R Narducci
- Unit of Allergology, San Michele Clinic, Maddaloni, Caserta, Italy
| | - G Papa
- ASL (Sanitary District), Avellino, Italy
| | - A Pedicini
- Unit of Allergology. Division of Internal Medicine, Fatebenefratelli Hospital, Benevento, Italy
| | | | | | - A Savoia
- Unit of Allergology. Division of Internal Medicine, Fatebenefratelli Hospital, Benevento, Italy
| | - A Stanziola
- Department of Respiratory Disease, Federico II University AO Dei Colli, Naples, Italy
| | - M B Bilò
- Allergy Unit, Department of Internal Medicine, University Hospital Ospedali Riuniti, Ancona, Department of Clinical and Molecular Sciences, Polytechnic University of Marche, Italy
| | - P Rogliani
- Postgraduate School of Respiratory Medicine, Department of Experimental Medicine, University of Rome Tor Vergata, Rome, Italy.,Department of Experimental Medicine, Unit of Respiratory Medicine University of Rome, Tor Vergata, Rome, Italy
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Pasquini L, Becerra‐Arciniegas R, Narducci R, Sgreccia E, Gressel V, Di Vona M, Knauth P. Properties and Alkaline Stability of Composite Anion Conducting Ionomers Based on Poly(phenylene oxide) Grafted with DABCO and Mg/Al Lamellar Double Hydroxide. ChemElectroChem 2020. [DOI: 10.1002/celc.202000523] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Luca Pasquini
- Aix Marseille Univ, CNRSMADIREL (UMR 7246) and International Associated Laboratory: Ionomer Materials for Energy Campus St Jérôme 13013 Marseille France
| | - Raul‐Andres Becerra‐Arciniegas
- Aix Marseille Univ, CNRSMADIREL (UMR 7246) and International Associated Laboratory: Ionomer Materials for Energy Campus St Jérôme 13013 Marseille France
- University of Rome Tor VergataDep. Industrial Engineering, and International Associated Laboratory: Ionomer Materials for Energy 00133 Roma Italy
| | - Riccardo Narducci
- University of Rome Tor VergataDep. Industrial Engineering, and International Associated Laboratory: Ionomer Materials for Energy 00133 Roma Italy
| | - Emanuela Sgreccia
- University of Rome Tor VergataDep. Industrial Engineering, and International Associated Laboratory: Ionomer Materials for Energy 00133 Roma Italy
| | - Vincent Gressel
- University of Rome Tor VergataDep. Industrial Engineering, and International Associated Laboratory: Ionomer Materials for Energy 00133 Roma Italy
- Internship of IUT Montpellier-Sète
| | - Maria‐Luisa Di Vona
- University of Rome Tor VergataDep. Industrial Engineering, and International Associated Laboratory: Ionomer Materials for Energy 00133 Roma Italy
| | - Philippe Knauth
- Aix Marseille Univ, CNRSMADIREL (UMR 7246) and International Associated Laboratory: Ionomer Materials for Energy Campus St Jérôme 13013 Marseille France
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Becerra-Arciniegas RA, Narducci R, Ercolani G, Antonaroli S, Sgreccia E, Pasquini L, Knauth P, Di Vona M. Alkaline stability of model anion exchange membranes based on poly(phenylene oxide) (PPO) with grafted quaternary ammonium groups: Influence of the functionalization route. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121931] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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12
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Giancola S, Arciniegas RAB, Fahs A, Chailan JF, Di Vona ML, Knauth P, Narducci R. Study of Annealed Aquivion ® Ionomers with the INCA Method †. Membranes (Basel) 2019; 9:E134. [PMID: 31627385 PMCID: PMC6835819 DOI: 10.3390/membranes9100134] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/10/2019] [Accepted: 10/14/2019] [Indexed: 11/16/2022]
Abstract
We investigated the possibility to increase the working temperature and endurance of proton exchange membranes for fuel cells and water electrolyzers by thermal annealing of short side chain perfluorosulfonic acid (SSC-PFSA) Aquivion® membranes. The Ionomer nc Analysis (INCA method), based on nc/T plots where nc is a counter elastic force index, was applied to SSC-PFSA in order to evaluate ionomer thermo-mechanical properties and to probe the increase of crystallinity during the annealing procedure. The enhanced thermal and mechanical stability of extruded Aquivion® 870 (equivalent weight, EW = 870 g·mol-1) was related to an increase of long-range order. Complementary differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) measurements confirmed the increase of polymer stiffness by the annealing treatment with an enhancement of the storage modulus over the whole range of temperature. The main thermomechanical relaxation temperature is also enhanced. DSC measurements showed slight base line changes after annealing, attributable to the glass transition and melting of a small amount of crystalline phase. The difference between the glass transition and melting temperatures derived from INCA plots and the ionic-cluster transition temperature derived from DMA measurements is consistent with the different experimental conditions, especially the dry atmosphere in DMA. Finally, the annealing procedure was also successfully applied for the first time to an un-crystallized cast membrane (EW = 830 g·mol-1) resulting in a remarkable mechanical and thermal stabilization.
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Affiliation(s)
- Stefano Giancola
- Institut Català d'investigaciò Química (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Spain.
| | - Raul Andres Becerra Arciniegas
- University of Rome Tor Vergata, Department of Industrial Engineering and International Associated Laboratory: Ionomer Materials for Energy, Via del Politecnico 1, 00133 Roma, Italy.
- Aix Marseille Université, CNRS, Madirel (UMR 7246), Electrochemistry of Materials Group and International Associated Laboratory: Ionomer Materials for Energy, Campus St Jérôme, 13013 Marseille, France.
| | - Armand Fahs
- Université de Toulon, MAPIEM (EA 4323), CS 60584, 83041 Toulon CEDEX 9, France.
| | | | - Maria Luisa Di Vona
- University of Rome Tor Vergata, Department of Industrial Engineering and International Associated Laboratory: Ionomer Materials for Energy, Via del Politecnico 1, 00133 Roma, Italy.
| | - Philippe Knauth
- Aix Marseille Université, CNRS, Madirel (UMR 7246), Electrochemistry of Materials Group and International Associated Laboratory: Ionomer Materials for Energy, Campus St Jérôme, 13013 Marseille, France.
| | - Riccardo Narducci
- University of Rome Tor Vergata, Department of Industrial Engineering and International Associated Laboratory: Ionomer Materials for Energy, Via del Politecnico 1, 00133 Roma, Italy.
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13
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Narducci R, Sgreccia E, Ercolani G, Sette M, Antonaroli S, Pasquini L, Knauth P, Di Vona ML. Influence of the position of ionic groups in amphoteric polyelectrolytes on hydration and ionic conduction: Side chain vs main chain. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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14
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Masi A, Narducci R, Mannaioni G. Harnessing ionic mechanisms to achieve disease modification in neurodegenerative disorders. Pharmacol Res 2019; 147:104343. [PMID: 31279830 DOI: 10.1016/j.phrs.2019.104343] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 06/19/2019] [Accepted: 07/03/2019] [Indexed: 12/12/2022]
Abstract
Progressive neuronal death is the key pathogenic event leading to clinical symptoms in neurodegenerative disorders (NDDs). Neuroprotective treatments are virtually unavailable, partly because of the marked internal heterogeneity of the mechanisms underlying pathology. Targeted neuroprotection would require deep mechanistic knowledge across the entire aetiological spectrum of each NDD and the development of tailored treatments. Although ideal, this strategy appears challenging, as it would require a degree of characterization of both the disease and the patient that is currently unavailable. The alternate strategy is to search for commonalities across molecularly distinct NDD forms and exploit these for the development of drugs with broad-spectrum efficacy. In this view, mounting evidence points to ionic mechanisms (IMs) as targets with potential therapeutic efficacy across distinct NDD subtypes. The scope of this review is to present clinical and preclinical evidence supporting the link between disruption of IMs and neuronal death in specific NDDs and to critically revise past and ongoing attempts of harnessing IMs for the development of neuroprotective treatments.
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Affiliation(s)
- A Masi
- Department of Neuroscience, Psychology, Drug Research and Child Health (NEUROFARBA), Section of Pharmacology and Toxicology, University of Florence, Florence, Italy; School of Pharmacy, University of Camerino, Camerino, Italy.
| | - R Narducci
- Italian Institute of Technology (IIT), Department of Neuroscience and Brain Technologies, Genova, Italy
| | - G Mannaioni
- Department of Neuroscience, Psychology, Drug Research and Child Health (NEUROFARBA), Section of Pharmacology and Toxicology, University of Florence, Florence, Italy; Toxicology Unit, Azienda Ospedaliero-Universitaria Careggi, Florence, Italy
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15
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Onesto V, Villani M, Narducci R, Malara N, Imbrogno A, Allione M, Costa N, Coppedè N, Zappettini A, Cannistraci CV, Cancedda L, Amato F, Di Fabrizio E, Gentile F. Cortical-like mini-columns of neuronal cells on zinc oxide nanowire surfaces. Sci Rep 2019; 9:4021. [PMID: 30858456 PMCID: PMC6411964 DOI: 10.1038/s41598-019-40548-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 02/18/2019] [Indexed: 11/25/2022] Open
Abstract
A long-standing goal of neuroscience is a theory that explains the formation of the minicolumns in the cerebral cortex. Minicolumns are the elementary computational units of the mature neocortex. Here, we use zinc oxide nanowires with controlled topography as substrates for neural-cell growth. We observe that neuronal cells form networks where the networks characteristics exhibit a high sensitivity to the topography of the nanowires. For certain values of nanowires density and fractal dimension, neuronal networks express small world attributes, with enhanced information flows. We observe that neurons in these networks congregate in superclusters of approximately 200 neurons. We demonstrate that this number is not coincidental: the maximum number of cells in a supercluster is limited by the competition between the binding energy between cells, adhesion to the substrate, and the kinetic energy of the system. Since cortical minicolumns have similar size, similar anatomical and topological characteristics of neuronal superclusters on nanowires surfaces, we conjecture that the formation of cortical minicolumns is likewise guided by the interplay between energy minimization, information optimization and topology. For the first time, we provide a clear account of the mechanisms of formation of the minicolumns in the brain.
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Affiliation(s)
- V Onesto
- Center for Advanced Biomaterials for HealthCare, Istituto Italiano di Tecnologia, 80125, Naples, Italy.,Department of Experimental and Clinical Medicine, University of Magna Graecia, 88100, Catanzaro, Italy
| | - M Villani
- IMEM-CNR Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - R Narducci
- Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy
| | - N Malara
- Department of Experimental and Clinical Medicine, University of Magna Graecia, 88100, Catanzaro, Italy
| | - A Imbrogno
- Tyndall National Institute, Cork, T12 R5CP, Ireland
| | - M Allione
- PSE division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - N Costa
- Health Department, University of Magna Graecia, 88100, Catanzaro, Italy
| | - N Coppedè
- IMEM-CNR Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - A Zappettini
- IMEM-CNR Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - C V Cannistraci
- Biomedical Cybernetics Group, Biotechnology Center (BIOTEC), Center for Molecular and Cellular Bioengineering (CMCB), Center for Systems Biology Dresden (CSBD), Department of Physics, Technische Universität Dresden, Tatzberg 47/49, 01307, Dresden, Germany.,Brain Bio-Inspired Computing (BBC) Lab, IRCCS Centro Neurolesi "Bonino Pulejo", Messina, 98124, Italy
| | - L Cancedda
- Istituto Italiano di Tecnologia, Via Morego 30, 16163, Genova, Italy.,Dulbecco Telethon Institute, Rome, Italy
| | - F Amato
- Department of Electrical Engineering and Information Technology, University Federico II, Naples, Italy
| | - Enzo Di Fabrizio
- PSE division, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - F Gentile
- Department of Electrical Engineering and Information Technology, University Federico II, Naples, Italy.
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16
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Ghetti G, Bacchi Reggiani ML, Rosetti C, Battistini P, Lanati G, Di Dio MT, Corsini A, Bruno M, Della Riva D, Bruno AG, Compagnone M, Narducci R, Saia F, Rapezzi C, Taglieri N. Prodromal angina and risk of 2-year cardiac mortality in patients with ST-segment elevation myocardial infarction undergoing primary percutaneous intervention. Medicine (Baltimore) 2018; 97:e12332. [PMID: 30212983 PMCID: PMC6156056 DOI: 10.1097/md.0000000000012332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
We sought to investigate the prognostic significance of prodromal angina (PA) in unselected patients with ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PPCI) and its additive predictive value to the GRACE score.We prospectively enrolled 3015 consecutive STEMI patients undergoing PPCI. Patients were divided in 2 groups according to the presence or absence of PA. Multivariable Cox regression was used to establish the relation to 2-year cardiac mortality of PA.The mean age of the study population was 68 (±14) years; 2178 patients (72%) were male. During follow-up, 395 (13%) patients died with 278 of these (9.2%) suffering from cardiac mortality. Kaplan-Meier estimates showed a survival rate of 95% and 87% for patients with PA and no PA, respectively (log rank test < 0.001). After multivariable analysis, patients with PA had still a lower risk of 2 years' cardiac mortality compared with patients without PA (adjusted hazard ratio = 0.50; 95% confidence interval [CI] 1.06-1.81, P = .001). Evaluation of net reclassification improvement showed that reclassification improved by 0.16% in case patients, whereas classification worsened in control patients by 1.08% leading to a net reclassification improvement of -0.93% (95% CI: -0.98, -0.88).In patients with STEMI undergoing PPCI the presence of PA is independently associated with a lower risk of 2-year cardiac mortality. However, the incorporation of this variable to the GRACE score slightly worsened the classification of risk. Accordingly, it seems unlikely that the evaluation of PA may be useful in clinical practice.
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17
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Taglieri N, Bacchi Reggiani ML, Ghetti G, Saia F, Compagnone M, Lanati G, Di Dio MT, Bruno A, Bruno M, Della Riva D, Corsini A, Narducci R, Rapezzi C. Efficacy and safety of thrombus aspiration in ST-segment elevation myocardial infarction: an updated systematic review and meta-analysis of randomised clinical trials. Eur Heart J Acute Cardiovasc Care 2018; 8:24-38. [PMID: 30160519 DOI: 10.1177/2048872618795512] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND: The role of thrombus aspiration plus primary percutaneous coronary intervention in ST-segment elevation myocardial infarction remains controversial. METHODS: We performed a meta-analysis of 25 randomised controlled trials in which 21,740 ST-segment elevation myocardial infarction patients were randomly assigned to thrombus aspiration plus primary percutaneous coronary intervention or primary percutaneous coronary intervention. Study endpoints were: death, myocardial infarction, stent thrombosis and stroke. RESULTS: On pooled analysis, the risk of death (4.3% vs. 4.8%, odds ratio (OR) 0.90, 95% confidence interval (CI) 0.79-1.03; P=0.123), myocardial infarction (2.4% vs. 2.5%, OR 0.95, 95% CI 0.80-1.13; P=0.57) and stent thrombosis (1.3% vs. 1.6%, OR 0.80, 95% CI 0.63-1.01; P=0.066) was similar between thrombus aspiration plus primary percutaneous coronary intervention and primary percutaneous coronary intervention. The risk of stroke was higher in the thrombus aspiration plus primary percutaneous coronary intervention than the primary percutaneous coronary intervention group (0.84% vs. 0.59%, OR 1.401, 95% CI 1.004-1.954; P=0.047). However, on sensitivity analysis after removing the TOTAL trial, thrombus aspiration plus primary percutaneous coronary intervention was not associated with an increased risk of stroke (OR 1.01, 95% CI 0.58-1.78). The weak association between thrombus aspiration and stroke was also confirmed by the fact that the lower bound of the 95% CI was slightly below unity after removing either the study by Kaltoft or the ITTI trial. There was no interaction between the main study results and follow-up, evidence of coronary thrombus, or study sample size. CONCLUSIONS: In patients with ST-segment elevation myocardial infarction, thrombus aspiration plus primary percutaneous coronary intervention does not reduce the risk of death, myocardial infarction or stent thrombosis. Thrombus aspiration plus primary percutaneous coronary intervention is associated with an increased risk of stroke; however, this latter finding appears weak.
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Affiliation(s)
- Nevio Taglieri
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Maria Letizia Bacchi Reggiani
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Gabriele Ghetti
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Francesco Saia
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Miriam Compagnone
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Gianluca Lanati
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Maria Teresa Di Dio
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Antonio Bruno
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Matteo Bruno
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Diego Della Riva
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Anna Corsini
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Riccardo Narducci
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
| | - Claudio Rapezzi
- Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale, Alma Mater Studiorum Università di Bologna, Italy
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18
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Pizzoferrato R, Ciotta E, Ferrari IV, Narducci R, Pasquini L, Varone A, Richetta M, Antonaroli S, Braglia M, Knauth P, Di Vona ML. Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes. ChemElectroChem 2018. [DOI: 10.1002/celc.201800807] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Roberto Pizzoferrato
- Department of Industrial Engineering; University of Rome Tor Vergata; 00133 Rome Italy
| | - Erica Ciotta
- Department of Industrial Engineering; University of Rome Tor Vergata; 00133 Rome Italy
| | - Ivan V. Ferrari
- Department of Industrial Engineering; University of Rome Tor Vergata; 00133 Rome Italy
- International Associated Laboratory (L.I.A.); Ionomer Materials for Energy (Aix Marseille Univ, CNRS, Univ. Roma Tor Vergata); France, Italy
- Aix Marseille Univ, CNRS, Madirel (UMR 7246); Electrochemistry of Materials Group; Campus St Jérôme 13397 Marseille France
| | - Riccardo Narducci
- Department of Industrial Engineering; University of Rome Tor Vergata; 00133 Rome Italy
- International Associated Laboratory (L.I.A.); Ionomer Materials for Energy (Aix Marseille Univ, CNRS, Univ. Roma Tor Vergata); France, Italy
| | - Luca Pasquini
- International Associated Laboratory (L.I.A.); Ionomer Materials for Energy (Aix Marseille Univ, CNRS, Univ. Roma Tor Vergata); France, Italy
- Aix Marseille Univ, CNRS, Madirel (UMR 7246); Electrochemistry of Materials Group; Campus St Jérôme 13397 Marseille France
| | - Alessandra Varone
- Department of Industrial Engineering; University of Rome Tor Vergata; 00133 Rome Italy
| | - Maria Richetta
- Department of Industrial Engineering; University of Rome Tor Vergata; 00133 Rome Italy
| | - Simonetta Antonaroli
- Department of Chemical Science and Technologies; University of Rome Tor Vergata; 00133 Rome Italy
| | - Michele Braglia
- Department of Industrial Engineering; University of Rome Tor Vergata; 00133 Rome Italy
- International Associated Laboratory (L.I.A.); Ionomer Materials for Energy (Aix Marseille Univ, CNRS, Univ. Roma Tor Vergata); France, Italy
- Aix Marseille Univ, CNRS, Madirel (UMR 7246); Electrochemistry of Materials Group; Campus St Jérôme 13397 Marseille France
| | - Philippe Knauth
- International Associated Laboratory (L.I.A.); Ionomer Materials for Energy (Aix Marseille Univ, CNRS, Univ. Roma Tor Vergata); France, Italy
- Aix Marseille Univ, CNRS, Madirel (UMR 7246); Electrochemistry of Materials Group; Campus St Jérôme 13397 Marseille France
| | - Maria Luisa Di Vona
- Department of Industrial Engineering; University of Rome Tor Vergata; 00133 Rome Italy
- International Associated Laboratory (L.I.A.); Ionomer Materials for Energy (Aix Marseille Univ, CNRS, Univ. Roma Tor Vergata); France, Italy
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19
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Bruno RM, Stea F, Sicari R, Ghiadoni L, Taddei S, Ungar A, Bonuccelli U, Tognoni G, Cintoli S, Del Turco S, Sbrana S, Gargani L, D’Angelo G, Pratali L, Berardi N, Maffei L, Picano E, Andreassi M, Angelucci A, Baldacci F, Baroncelli L, Begenisic T, Bellinvia P, Biagi L, Bonaccorsi J, Bonanni E, Borghini A, Braschi C, Broccardi M, Caleo M, Carlesi C, Carnicelli L, Cartoni G, Cecchetti L, Cenni M, Ceravolo R, Chico L, Cioni G, Costa M, D’Ascanio P, De Nes M, Di Coscio E, Di Galante M, di Lascio N, Faita F, Falorni I, Faraguna U, Fenu A, Fortunato L, Franco R, Gargiulo R, Giorgi F, Iannarella R, Iofrida C, Kusmic C, Limongi F, Maestri M, Maffei M, Maggi S, Mainardi M, Mammana L, Marabotti A, Mariotti V, Melissari E, Mercuri A, Molinaro S, Narducci R, Navarra T, Noale M, Pagni C, Palumbo S, Pasquariello R, Pellegrini S, Pietrini P, Pizzorusso T, Poli A, Retico A, Ricciardi E, Rota G, Sale A, Scabia G, Scali M, Scelfo D, Siciliano G, Tonacci A, Tosetti M, Turchi S, Volpi L. Vascular Function Is Improved After an Environmental Enrichment Program. Hypertension 2018; 71:1218-1225. [DOI: 10.1161/hypertensionaha.117.10066] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 08/09/2017] [Accepted: 03/15/2018] [Indexed: 11/16/2022]
Abstract
Environmental enrichment may slow cognitive decay possibly acting through an improvement in vascular function. Aim of the study was to assess the effects of a 7-month cognitive, social, and physical training program on cognitive and vascular function in patients with mild cognitive impairment. In a single-center, randomized, parallel-group study, 113 patients (age, 65–89 years) were randomized to multidomain training (n=55) or usual care (n=58). All participants underwent neuropsychological tests and vascular evaluation, including brachial artery flow-mediated dilation, carotid–femoral pulse wave velocity, carotid distensibility, and assessment of circulating hematopoietic CD34+ and endothelial progenitor cells. At study entry, an age-matched control group (n=45) was also studied. Compared with controls, patients had at study entry a reduced flow-mediated dilation (2.97±2.14% versus 3.73±2.06%;
P
=0.03) and hyperemic stimulus (shear rate area under the curve, 19.1±15.7 versus 25.7±15.1×10
−3
;
P
=0.009); only the latter remained significant after adjustment for confounders (
P
=0.03). Training improved Alzheimer disease assessment scale cognitive (training, 14.0±4.8 to 13.1±5.5; nontraining, 12.1±3.9 to 13.2±4.8;
P
for interaction visit×training=0.02), flow-mediated dilation (2.82±2.19% to 3.40±1.81%, 3.05±2.08% to 2.24±1.59%;
P
=0.006;
P
=0.023 after adjustment for diameter and shear rate area under the curve), and circulating hematopoietic CD34
+
cells and prevented the decline in carotid distensibility (18.4±5.3 to 20.0±6.6, 23.9±11.0 to 19.5±7.1 Pa
−1
;
P
=0.005). The only clinical predictor of improvement of cognitive function after training was established hypertension. There was no correlation between changes in measures of cognitive and vascular function. In conclusion, a multidomain training program slows cognitive decline, especially in hypertensive individuals. This effect is accompanied by improved systemic endothelial function, mobilization of progenitor CD34
+
cells, and preserved carotid distensibility.
Clinical Trial Registration—
URL:
http://www.clinicaltrials.gov
. Unique identifier: NCT01725178.
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Affiliation(s)
- Rosa Maria Bruno
- From the Department of Clinical and Experimental Medicine, University of Pisa, Italy (R.M.B., F.S., L.G., S.T., U.B.)
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
| | - Francesco Stea
- From the Department of Clinical and Experimental Medicine, University of Pisa, Italy (R.M.B., F.S., L.G., S.T., U.B.)
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
| | - Rosa Sicari
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
| | - Lorenzo Ghiadoni
- From the Department of Clinical and Experimental Medicine, University of Pisa, Italy (R.M.B., F.S., L.G., S.T., U.B.)
| | - Stefano Taddei
- From the Department of Clinical and Experimental Medicine, University of Pisa, Italy (R.M.B., F.S., L.G., S.T., U.B.)
| | | | - Ubaldo Bonuccelli
- From the Department of Clinical and Experimental Medicine, University of Pisa, Italy (R.M.B., F.S., L.G., S.T., U.B.)
| | - Gloria Tognoni
- Azienda Ospedaliero Universitaria Careggi, University of Florence, Italy (A.U.); Azienda Ospedaliero Universitaria Pisana, Italy (G.T., S.C.)
| | - Simona Cintoli
- Azienda Ospedaliero Universitaria Careggi, University of Florence, Italy (A.U.); Azienda Ospedaliero Universitaria Pisana, Italy (G.T., S.C.)
| | - Serena Del Turco
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
| | - Silverio Sbrana
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
| | - Luna Gargani
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
| | - Gennaro D’Angelo
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
| | - Lorenza Pratali
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
| | | | | | - Eugenio Picano
- Institute of Clinical Physiology of the National Research Council (CNR), Pisa, Italy (R.M.B., F.S., R.S., S.D.T., S.S., L.G., G.D., L.P., E.P.)
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20
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Abstract
We present a mathematical model that quantifies the amount of information exchanged in bi-dimensional networks of nerve cells as a function of network connectivity Q. Upon varying Q over a significant range, we found that, from a certain cell density onwards, 90% of the maximal information transferred I(Q) in a random neuronal network is already reached with just 40% of the total possible connections Q among the cells. As a consequence, the system would not benefit from additional connections in terms of the amount of I(Q), in agreement with the tendency of brains to minimize Q because of its energetic costs. The model may reveal the circuits responsible for neurodegenerative disorders in that neurodegeneration can be regarded as a connective failure affecting information.
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Affiliation(s)
- V Onesto
- Department of Experimental and Clinical Medicine, University of Magna Graecia, 88100 Catanzaro, Italy
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21
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Abstract
A tailor-made annealing procedure was developed for Nafion in order to avoid a critical degradation of the mechanical properties associated with a decrease of the ionic conductivity.
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Affiliation(s)
- Riccardo Narducci
- University of Rome Tor Vergata
- Department of Industrial Engineering
- 00133 Roma
- Italy
- International Associated Laboratory (L.I.A.)
| | - Philippe Knauth
- Aix Marseille Univ
- CNRS
- Madirel (UMR 7246)
- Electrochemistry of Materials Group
- 13397 Marseille
| | | | - Maria Luisa Di Vona
- University of Rome Tor Vergata
- Department of Industrial Engineering
- 00133 Roma
- Italy
- International Associated Laboratory (L.I.A.)
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Donnadio A, Narducci R, Casciola M, Marmottini F, D'Amato R, Jazestani M, Chiniforoshan H, Costantino F. Mixed Membrane Matrices Based on Nafion/UiO-66/SO 3H-UiO-66 Nano-MOFs: Revealing the Effect of Crystal Size, Sulfonation, and Filler Loading on the Mechanical and Conductivity Properties. ACS Appl Mater Interfaces 2017; 9:42239-42246. [PMID: 29115824 DOI: 10.1021/acsami.7b14847] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mixed membrane matrices (MMMs) made up with Nafion and nanocrystals of zirconium metal-organic framework (MOF) UiO-66 or the analogous sulfonated SO3H-UiO-66 were prepared by varying the filler loading and the size of the crystals. The combined effects of size and loading, together with the presence of sulfonic groups covalently linked to the MOFs, were studied with regard to the conductivity and mechanical properties of the obtained composite matrices. A large screening of membranes was preliminarily made and, on the most promising samples, an accurate conductivity study at different relative humidities and temperatures was also carried out. The results showed that membranes containing large crystals (200 nm average size) in low amounts (around 2%) displayed the best results in terms of proton conductivity values, reaching values by 30% higher than those of pure Nafion, while leaving the mechanical properties substantially unchanged. On the contrary, MMMs containing MOFs of small size (20 nm average size) did not show any conductivity improvements if compared to pure Nafion membranes. The effect of MOF sulfonation was negligible at low filler loading whereas it became important at loading values around 10%. Finally, membranes with a high filler loading (up to 60 wt %) of sulfonated UiO-66 showed a slight reduction of conductivity in comparison with membranes loaded at 20% of nonsulfonated ones.
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Affiliation(s)
- Anna Donnadio
- Department of Pharmaceutical Sciences, University of Perugia , Via A. Fabretti 48, 06123 Perugia, Italy
| | - Riccardo Narducci
- Department of Industrial Engineering, University of Rome Tor Vergata (URoma2) , Via del Politecnico 1, 00133 Roma, Italy
| | - Mario Casciola
- Department of Chemistry, Biology and Biotechnologies, University of Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Fabio Marmottini
- Department of Chemistry, Biology and Biotechnologies, University of Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Roberto D'Amato
- Department of Chemistry, Biology and Biotechnologies, University of Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Mehdi Jazestani
- Department of Chemistry, Isfahan University of Technology , Isfahan 84156-83111, Iran
| | - Hossein Chiniforoshan
- Department of Chemistry, Isfahan University of Technology , Isfahan 84156-83111, Iran
| | - Ferdinando Costantino
- Department of Chemistry, Biology and Biotechnologies, University of Perugia , Via Elce di Sotto 8, 06123 Perugia, Italy
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Narducci R, Pasquini L, Chailan JF, Knauth P, Di Vona ML. Low-Permeability Poly(ether Ether Ketone)-Based Ampholytic Membranes. Chempluschem 2016; 81:550-556. [DOI: 10.1002/cplu.201600076] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 03/25/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Riccardo Narducci
- University of Rome Tor Vergata (URoma2), Dip. Ingegneria Industriale; 00133 Roma Italy
- Aix Marseille University (AMU), CNRS, Madirel (UMR 7246); Campus St Jérôme 13397 Marseille France
- International Associated Laboratory (LIA): “Ionomer Materials for Energy” (AMU, URoma2, CNRS)
| | - Luca Pasquini
- University of Rome Tor Vergata (URoma2), Dip. Ingegneria Industriale; 00133 Roma Italy
- Aix Marseille University (AMU), CNRS, Madirel (UMR 7246); Campus St Jérôme 13397 Marseille France
- International Associated Laboratory (LIA): “Ionomer Materials for Energy” (AMU, URoma2, CNRS)
| | | | - Philippe Knauth
- Aix Marseille University (AMU), CNRS, Madirel (UMR 7246); Campus St Jérôme 13397 Marseille France
- International Associated Laboratory (LIA): “Ionomer Materials for Energy” (AMU, URoma2, CNRS)
| | - Maria Luisa Di Vona
- University of Rome Tor Vergata (URoma2), Dip. Ingegneria Industriale; 00133 Roma Italy
- International Associated Laboratory (LIA): “Ionomer Materials for Energy” (AMU, URoma2, CNRS)
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Narducci R, Chailan JF, Fahs A, Pasquini L, Di Vona ML, Knauth P. Mechanical properties of anion exchange membranes by combination of tensile stress-strain tests and dynamic mechanical analysis. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.24025] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Riccardo Narducci
- Aix Marseille Université, CNRS, Madirel (UMR 7246), Campus St Jérôme; 13397 Marseille Cedex 20 France
- Università Di Roma Tor Vergata, Dip. Ingegneria Industriale; Via del Politecnico Roma 00133 Italy
- International Associated Laboratory (L.I.A.): Ionomer Materials for Energy (AMU - URoma2 - CNRS)
| | - J.-F. Chailan
- Université De Toulon; MAPIEM (EA 4323), CS 60584 83041 Toulon Cedex 9 France
| | - A. Fahs
- Université De Toulon; MAPIEM (EA 4323), CS 60584 83041 Toulon Cedex 9 France
| | - Luca Pasquini
- Aix Marseille Université, CNRS, Madirel (UMR 7246), Campus St Jérôme; 13397 Marseille Cedex 20 France
- Università Di Roma Tor Vergata, Dip. Ingegneria Industriale; Via del Politecnico Roma 00133 Italy
- International Associated Laboratory (L.I.A.): Ionomer Materials for Energy (AMU - URoma2 - CNRS)
| | - Maria Luisa Di Vona
- Università Di Roma Tor Vergata, Dip. Ingegneria Industriale; Via del Politecnico Roma 00133 Italy
- International Associated Laboratory (L.I.A.): Ionomer Materials for Energy (AMU - URoma2 - CNRS)
| | - Philippe Knauth
- Aix Marseille Université, CNRS, Madirel (UMR 7246), Campus St Jérôme; 13397 Marseille Cedex 20 France
- International Associated Laboratory (L.I.A.): Ionomer Materials for Energy (AMU - URoma2 - CNRS)
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Masi A, Narducci R, Landucci E, Moroni F, Mannaioni G. MPP(+) -dependent inhibition of Ih reduces spontaneous activity and enhances EPSP summation in nigral dopamine neurons. Br J Pharmacol 2014; 169:130-42. [PMID: 23323755 DOI: 10.1111/bph.12104] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 12/21/2012] [Accepted: 01/07/2013] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND AND PURPOSE 1-Methyl-4-phenylpyridinium (MPP(+) ), a potent parkinsonizing agent in primates and rodents, is a blocker of mitochondrial complex I, therefore MPP(+) -induced parkinsonism is believed to depend largely on mitochondrial impairment. However, it has recently been proposed that other mechanisms may participate in MPP(+) -induced toxicity. We tackled this issue by probing the effects of an acute application of MPP(+) on substantia nigra pars compacta (SNc) dopamine (DA) neurons. EXPERIMENTAL APPROACH The effects of MPP(+) on SNc DA neurons in acute midbrain slices were investigated with electrophysiology techniques. KEY RESULTS MPP(+) (50 μM) was able to (i) hyperpolarize SNc DA neurons by ∼6 mV; (ii) cause an abrupt and marked (over 50%) reduction of the spontaneous activity; and (iii) inhibit the hyperpolarization-activated inward current (Ih ). MPP(+) shifted Ih activation curve towards negative potentials by ∼11 mV both in Wistar rats and in C57/BL6 mice. Inhibition was voltage- and concentration-dependent (Imax = 47%, IC50 = 7.74 μM). MPP(+) slowed Ih activation kinetics at all potentials. These effects were not dependent on (i) block of mitochondrial complex I/fall of ATP levels; (ii) activation of type 2 DA receptor; and (iii) alteration of cAMP metabolism. Finally, MPP(+) -dependent inhibition of Ih facilitated temporal summation of evoked EPSPs in SNc DA, but not in CA1 hippocampal neurons. CONCLUSION AND IMPLICATIONS Reduced functionality of Ih in SNc DA neurons, via increased responsiveness towards synaptic excitation, might play a role in MPP(+) -induced parkinsonism and, possibly, in the pathogenesis of human Parkinson's.
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Affiliation(s)
- A Masi
- Department of Neurosciences, Psychology, Drug Research and Child Health - Section of Pharmacology and Toxicology, University of Florence, Florence, Italy.
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Narducci R, Di Vona M, Knauth P. Cation-conducting ionomers made by ion exchange of sulfonated poly-ether-ether-ketone: Hydration, mechanical and thermal properties and ionic conductivity. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.03.073] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Derenzini E, Stefoni V, Maglie R, Casadei B, Pellegrini C, Broccoli A, Stefani G, Fanti S, Motta MR, Narducci R, Argnani L, Zinzani PL. Collection of Hematopoietic Stem Cells after Previous Radioimmunotherapy is Feasible and Does Not Impair Engraftment after Autologous Stem Cell Transplantation in Follicular Lymphoma. Biol Blood Marrow Transplant 2013; 19:1695-701. [DOI: 10.1016/j.bbmt.2013.09.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Accepted: 09/10/2013] [Indexed: 10/26/2022]
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Gandolfi L, Stefani G, Narducci R, Argnani L, Polito E, Zinzani PL. Primary ocular adnexal lymphomas: a retrospective study of 25 patients. Leuk Lymphoma 2013; 54:2076-8. [DOI: 10.3109/10428194.2013.765567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Broccoli A, Derenzini E, Pellegrini C, Narducci R, Stefani G, Casadei B, Argnani L, Zinzani PL. Complete Response of Relapsed Systemic and Cutaneous Anaplastic Large Cell Lymphoma Using Brentuximab Vedotin: 2 Case Reports. Clinical Lymphoma Myeloma and Leukemia 2013; 13:493-5. [DOI: 10.1016/j.clml.2013.03.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 02/09/2013] [Accepted: 03/27/2013] [Indexed: 11/29/2022]
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Alberti G, Narducci R, Di Vona ML, Giancola S. More on Nafion Conductivity Decay at Temperatures Higher than 80 °C: Preparation and First Characterization of In-Plane Oriented Layered Morphologies. Ind Eng Chem Res 2013. [DOI: 10.1021/ie303628c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Giulio Alberti
- Dipartimento
di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133
Roma, Italy
| | - Riccardo Narducci
- Dipartimento
di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133
Roma, Italy
| | - Maria Luisa Di Vona
- Dipartimento
di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133
Roma, Italy
| | - Stefano Giancola
- Dipartimento
di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133
Roma, Italy
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Paciaroni A, Casciola M, Cornicchi E, Marconi M, Onori G, Pica M, Narducci R. Temperature-Dependent Dynamics of Water Confined in Nafion Membranes. J Phys Chem B 2006; 110:13769-76. [PMID: 16836322 DOI: 10.1021/jp0572176] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We performed a neutron scattering study to investigate the dynamical behavior of water absorbed in Nafion at low hydration level as a function of temperature in the range 200-300 K. To single out the spectral contribution of the confined water, the measurements were done on samples hydrated with both H(2)O and D(2)O. Due to the strong incoherent scattering cross section of hydrogen atoms with respect to deuterium, in the difference spectra, the contribution from the Nafion membrane is subtracted out and the signal originates essentially from protons in the liquid phase. The main quantities we extracted as a function of the momentum transfer are the elastic incoherent structure factor (EISF) and the line width of the quasielastic component. Their trend suggests that the motion of hydrogen atoms can be schematized as a random jumping inside a confining region, which can be related to the boundaries of the space where water molecules move in the cluster they form around the sulfonic acid site. Through the calculated EISF, we obtained information on the size of such a region, which increases up to 260 K and then attains a constant value. Above this temperature, the number of water protons that are dynamically activated in the accessible time window increases with a faster rate. The jump diffusion dynamics is characterized by a typical jumping time which is stable at 5.3 ps up to approximately 260 K and then gradually decreases. The ensemble of the findings indicates that, within the limits of the energy resolution of the present experiment, water absorbed in the Nafion membrane undergoes a dynamical transition at around 260 K. We discuss the possible relationship of this dynamical onset with the behavior of the electrical conductivity of the membrane as a function of the temperature.
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Affiliation(s)
- A Paciaroni
- Dipartimento di Fisica dell'Università di Perugia and INFM-CRS SOFT Unità di Perugia, Via A. Pascoli, I-06123 Perugia, Italy.
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