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Velisoju VK, Cerrillo JL, Ahmad R, Mohamed HO, Attada Y, Cheng Q, Yao X, Zheng L, Shekhah O, Telalovic S, Narciso J, Cavallo L, Han Y, Eddaoudi M, Ramos-Fernández EV, Castaño P. Copper nanoparticles encapsulated in zeolitic imidazolate framework-8 as a stable and selective CO 2 hydrogenation catalyst. Nat Commun 2024; 15:2045. [PMID: 38448464 PMCID: PMC10918174 DOI: 10.1038/s41467-024-46388-4] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 02/23/2024] [Indexed: 03/08/2024] Open
Abstract
Metal-organic frameworks have drawn attention as potential catalysts owing to their unique tunable surface chemistry and accessibility. However, their application in thermal catalysis has been limited because of their instability under harsh temperatures and pressures, such as the hydrogenation of CO2 to methanol. Herein, we use a controlled two-step method to synthesize finely dispersed Cu on a zeolitic imidazolate framework-8 (ZIF-8). This catalyst suffers a series of transformations during the CO2 hydrogenation to methanol, leading to ~14 nm Cu nanoparticles encapsulated on the Zn-based MOF that are highly active (2-fold higher methanol productivity than the commercial Cu-Zn-Al catalyst), very selective (>90%), and remarkably stable for over 150 h. In situ spectroscopy, density functional theory calculations, and kinetic results reveal the preferential adsorption sites, the preferential reaction pathways, and the reverse water gas shift reaction suppression over this catalyst. The developed material is robust, easy to synthesize, and active for CO2 utilization.
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Affiliation(s)
- Vijay K Velisoju
- Multiscale Reaction Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Jose L Cerrillo
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Rafia Ahmad
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Hend Omar Mohamed
- Multiscale Reaction Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Yerrayya Attada
- Multiscale Reaction Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Qingpeng Cheng
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, Thuwal, 23955-6900, Saudi Arabia
| | - Xueli Yao
- Multiscale Reaction Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Lirong Zheng
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Osama Shekhah
- King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, Thuwal, 23955-6900, Saudi Arabia
| | - Selvedin Telalovic
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Javier Narciso
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, E-03080, Alicante, Spain
| | - Luigi Cavallo
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Yu Han
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, Thuwal, 23955-6900, Saudi Arabia
| | - Mohamed Eddaoudi
- King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, Thuwal, 23955-6900, Saudi Arabia
| | - Enrique V Ramos-Fernández
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, E-03080, Alicante, Spain
- Advanced Catalytic Materials (ACM), KAUST Catalysis Center (KCC), KAUST, Thuwal, Saudi Arabia
| | - Pedro Castaño
- Multiscale Reaction Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
- Chemical Engineering Program, Physical Science and Engineering (PSE) Division, KAUST, Thuwal, Saudi Arabia.
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2
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Cordero-Lanzac T, Capel Berdiell I, Airi A, Chung SH, Mancuso JL, Redekop EA, Fabris C, Figueroa-Quintero L, Navarro de Miguel JC, Narciso J, Ramos-Fernandez EV, Svelle S, Van Speybroeck V, Ruiz-Martínez J, Bordiga S, Olsbye U. Transitioning from Methanol to Olefins (MTO) toward a Tandem CO 2 Hydrogenation Process: On the Role and Fate of Heteroatoms (Mg, Si) in MAPO-18 Zeotypes. JACS Au 2024; 4:744-759. [PMID: 38425934 PMCID: PMC10900493 DOI: 10.1021/jacsau.3c00768] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 01/26/2024] [Accepted: 01/26/2024] [Indexed: 03/02/2024]
Abstract
The tandem CO2 hydrogenation to hydrocarbons over mixed metal oxide/zeolite catalysts (OXZEO) is an efficient way of producing value-added hydrocarbons (platform chemicals and fuels) directly from CO2via methanol intermediate in a single reactor. In this contribution, two MAPO-18 zeotypes (M = Mg, Si) were tested and their performance was compared under methanol-to-olefins (MTO) conditions (350 °C, PCH3OH = 0.04 bar, 6.5 gCH3OH h-1 g-1), methanol/CO/H2 cofeed conditions (350 °C, PCH3OH/PCO/PH2 = 1:7.3:21.7 bar, 2.5 gCH3OH h-1 g-1), and tandem CO2 hydrogenation-to-olefin conditions (350 °C, PCO2/PH2 = 7.5:22.5 bar, 1.4-12.0 gMAPO-18 h molCO2-1). In the latter case, the zeotypes were mixed with a fixed amount of ZnO:ZrO2 catalyst, well-known for the conversion of CO2/H2 to methanol. Focus was set on the methanol conversion activity, product selectivity, and performance stability with time-on-stream. In situ and ex situ Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), solid-state nuclear magnetic resonance (NMR), sorption experiments, and ab initio molecular dynamics (AIMD) calculations were performed to correlate material performance with material characteristics. The catalytic tests demonstrated the better performance of MgAPO-18 versus SAPO-18 at MTO conditions, the much superior performance of MgAPO-18 under methanol/CO/H2 cofeeds, and yet the increasingly similar performance of the two materials under tandem conditions upon increasing the zeotype-to-oxide ratio in the tandem catalyst bed. In situ FT-IR measurements coupled with AIMD calculations revealed differences in the MTO initiation mechanism between the two materials. SAPO-18 promoted initial CO2 formation, indicative of a formaldehyde-based decarboxylation mechanism, while CO and ketene were the main constituents of the initiation pool in MgAPO-18, suggesting a decarbonylation mechanism. Under tandem CO2 hydrogenation conditions, the presence of high water concentrations and low methanol partial pressure in the reaction medium led to lower, and increasingly similar, methanol turnover frequencies for the zeotypes. Despite both MAPO-18 zeotypes showing signs of activity loss upon storage due to the interaction of the sites with ambient humidity, they presented a remarkable stability after reaching steady state under tandem reaction conditions and after steaming and regeneration cycles at high temperatures. Water adsorption experiments at room temperature confirmed this observation. The faster activity loss observed in the Mg version is assigned to its harder Mg2+-ion character and the higher concentration of CHA defects in the AEI structure, identified by solid-state NMR and XRD. The low stability of a MgAPO-34 zeotype (CHA structure) upon storage corroborated the relationship between CHA defects and instability.
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Affiliation(s)
- Tomás Cordero-Lanzac
- Department
of Chemistry, SMN Centre for Materials Science and Nanotechnology, University of Oslo, 0371 Oslo, Norway
| | - Izar Capel Berdiell
- Department
of Chemistry, SMN Centre for Materials Science and Nanotechnology, University of Oslo, 0371 Oslo, Norway
| | - Alessia Airi
- Department
of Chemistry, NIS Center and INSTM Reference Center, University of Turin, Turin 10125, Italy
| | - Sang-Ho Chung
- KAUST
Catalysis Center (KCC), King Abdullah University
of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Jenna L. Mancuso
- Center
for Molecular Modeling, Ghent University, Technologiepark 46, B-9052 Zwijnaarde, Belgium
| | - Evgeniy A. Redekop
- Department
of Chemistry, SMN Centre for Materials Science and Nanotechnology, University of Oslo, 0371 Oslo, Norway
| | - Claudia Fabris
- Department
of Chemistry, SMN Centre for Materials Science and Nanotechnology, University of Oslo, 0371 Oslo, Norway
| | - Leidy Figueroa-Quintero
- Inorganic
Chemistry Department, Laboratory of Advanced Materials, University Materials Institute of Alicante, University
of Alicante, Apartado 99, Alicante 03080, Spain
| | - Juan C. Navarro de Miguel
- KAUST
Catalysis Center (KCC), King Abdullah University
of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Javier Narciso
- Inorganic
Chemistry Department, Laboratory of Advanced Materials, University Materials Institute of Alicante, University
of Alicante, Apartado 99, Alicante 03080, Spain
| | - Enrique V. Ramos-Fernandez
- Inorganic
Chemistry Department, Laboratory of Advanced Materials, University Materials Institute of Alicante, University
of Alicante, Apartado 99, Alicante 03080, Spain
| | - Stian Svelle
- Department
of Chemistry, SMN Centre for Materials Science and Nanotechnology, University of Oslo, 0371 Oslo, Norway
| | | | - Javier Ruiz-Martínez
- KAUST
Catalysis Center (KCC), King Abdullah University
of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Silvia Bordiga
- Department
of Chemistry, NIS Center and INSTM Reference Center, University of Turin, Turin 10125, Italy
| | - Unni Olsbye
- Department
of Chemistry, SMN Centre for Materials Science and Nanotechnology, University of Oslo, 0371 Oslo, Norway
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Balloi V, Diaz-Perez MA, Lara-Angulo MA, Villalgordo-Hernández D, Narciso J, Ramos-Fernandez EV, Serrano-Ruiz JC. Metal-Organic Frameworks as Formose Reaction Catalysts with Enhanced Selectivity. Molecules 2023; 28:6095. [PMID: 37630347 PMCID: PMC10458508 DOI: 10.3390/molecules28166095] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 07/28/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
The formose reaction is an autocatalytic series of aldol condensations that allows one to obtain monosaccharides from formaldehyde. The formose reaction suffers from a lack of selectivity, which hinders practical applications at the industrial level. Over the years, many attempts have been made to overcome this selectivity issue, with modest results. Heterogeneous porous catalysts with acid-base properties, such as Metal-Organic Frameworks (MOFs), can offer advantages compared to homogeneous strong bases (e.g., calcium hydroxide) for increasing the selectivity of this important reaction. For the very first time, four different Zeolite Imidazolate Frameworks are presented in this work as catalysts for the formose reaction in liquid phase, and their catalytic performances were compared with those of the typical homogeneous catalyst (i.e., calcium hydroxide). The heterogeneous nature of the catalysis, the possible contribution of leached metal or linkers to the solution, and the stability of the materials were investigated. The porous structure of these solids and their mild basicity make them suitable for obtaining enhanced selectivity at 30% formaldehyde conversion. Most of the MOFs tested showed low structural stability under reaction conditions, thereby indicating the need to search for new MOF families with higher robustness. However, this important result opens the path for future research on porous heterogeneous basic catalysts for the formose reaction.
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Affiliation(s)
- Valentina Balloi
- Materials and Sustainability Group, Department of Engineering, Universidad Loyola Andalucía, Avenida de las Universidades, s/n, 41704 Sevilla, Spain; (V.B.); (M.A.D.-P.); (M.A.L.-A.)
| | - Manuel Antonio Diaz-Perez
- Materials and Sustainability Group, Department of Engineering, Universidad Loyola Andalucía, Avenida de las Universidades, s/n, 41704 Sevilla, Spain; (V.B.); (M.A.D.-P.); (M.A.L.-A.)
| | - Mayra Anabel Lara-Angulo
- Materials and Sustainability Group, Department of Engineering, Universidad Loyola Andalucía, Avenida de las Universidades, s/n, 41704 Sevilla, Spain; (V.B.); (M.A.D.-P.); (M.A.L.-A.)
| | - David Villalgordo-Hernández
- Laboratory of Advanced Materials, Inorganic Chemistry Department, University Materials Institute of Alicante, University of Alicante, Apartado 99, 03080 Alicante, Spain; (D.V.-H.); (J.N.); (E.V.R.-F.)
| | - Javier Narciso
- Laboratory of Advanced Materials, Inorganic Chemistry Department, University Materials Institute of Alicante, University of Alicante, Apartado 99, 03080 Alicante, Spain; (D.V.-H.); (J.N.); (E.V.R.-F.)
| | - Enrique V. Ramos-Fernandez
- Laboratory of Advanced Materials, Inorganic Chemistry Department, University Materials Institute of Alicante, University of Alicante, Apartado 99, 03080 Alicante, Spain; (D.V.-H.); (J.N.); (E.V.R.-F.)
| | - Juan Carlos Serrano-Ruiz
- Materials and Sustainability Group, Department of Engineering, Universidad Loyola Andalucía, Avenida de las Universidades, s/n, 41704 Sevilla, Spain; (V.B.); (M.A.D.-P.); (M.A.L.-A.)
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Figueroa-Quintero L, Villalgordo-Hernández D, Delgado-Marín JJ, Narciso J, Velisoju VK, Castaño P, Gascón J, Ramos-Fernández EV. Post-Synthetic Surface Modification of Metal-Organic Frameworks and Their Potential Applications. Small Methods 2023; 7:e2201413. [PMID: 36789569 DOI: 10.1002/smtd.202201413] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 12/21/2022] [Indexed: 06/18/2023]
Abstract
Metal-organic frameworks (MOFs) are porous hybrid materials with countless potential applications. Most of these rely on their porous structure, tunable composition, and the possibility of incorporating and expanding their functions. Although functionalization of the inner surface of MOF crystals has received considerable attention in recent years, methods to functionalize selectively the outer crystal surface of MOFs are developed to a lesser extent, despite their importance. This article summarizes different types of post-synthetic modifications and possible applications of modified materials such as: catalysis, adsorption, drug delivery, mixed matrix membranes, and stabilization of porous liquids.
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Affiliation(s)
- Leidy Figueroa-Quintero
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales de Alicante Universidad de Alicante, E-03080, Alicante, Spain
| | - David Villalgordo-Hernández
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales de Alicante Universidad de Alicante, E-03080, Alicante, Spain
| | - José J Delgado-Marín
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales de Alicante Universidad de Alicante, E-03080, Alicante, Spain
| | - Javier Narciso
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales de Alicante Universidad de Alicante, E-03080, Alicante, Spain
| | - Vijay Kumar Velisoju
- KAUST Catalysis Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Pedro Castaño
- KAUST Catalysis Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Jorge Gascón
- KAUST Catalysis Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Enrique V Ramos-Fernández
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica - Instituto Universitario de Materiales de Alicante Universidad de Alicante, E-03080, Alicante, Spain
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5
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Ramos-Fernández EV, Narciso J. Manufacture of SiC: Effect of Carbon Precursor. Materials (Basel) 2023; 16:2034. [PMID: 36903150 PMCID: PMC10004378 DOI: 10.3390/ma16052034] [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: 01/25/2023] [Revised: 02/20/2023] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
SiC is one of the most important ceramics at present due to its excellent properties and wide range of applications. The industrial production method, known as the Acheson method, has not changed in 125 years. Because the synthesis method in the laboratory is completely different, laboratory optimisation may not be extrapolated to the industrial level. In the present study, the results at the industrial level and at the laboratory level of the synthesis of SiC are compared. These results show that it is necessary to make a more detailed analysis of the coke than the traditional one; therefore, the Optical Texture Index (OTI) should be included, as well as the analysis of the metals that form the ashes. It has been found that the main influencing factors are OTI and the presence of Fe and Ni in the ashes. It has been determined that the higher the OTI, as well as the Fe and Ni content, the better the results obtained. Therefore, the use of regular coke is recommended in the industrial synthesis of SiC.
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Affiliation(s)
- Enrique V. Ramos-Fernández
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, E-03080 Alicante, Spain
| | - Javier Narciso
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, E-03080 Alicante, Spain
- Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), E-03080 Alicante, Spain
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Delgado-Marín JJ, Rendón-Patiño A, Velisoju VK, Kumar GS, Zambrano N, Rueping M, Gascón J, Castaño P, Narciso J, Ramos-Fernandez EV. Leaching in Specific Facets of ZIF-67 and ZIF-L Zeolitic Imidazolate Frameworks During the CO 2 Cycloaddition with Epichlorohydrin. Chem Mater 2023; 35:692-699. [PMID: 37520114 PMCID: PMC10373435 DOI: 10.1021/acs.chemmater.2c03374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/21/2022] [Indexed: 08/01/2023]
Abstract
Zeolitic imidazolate frameworks (ZIFs) have been profusely used as catalysts for inserting CO2 into organic epoxides (i.e., epichlorohydrin) through cycloaddition. Here, we demonstrate that these materials suffer from irreversible degradation by leaching. To prove this, we performed the reactions and analyzed the final reaction mixtures by elemental analysis and the resulting materials by different microscopies. We found that the difference in catalytic activity between three ZIF-67 and one ZIF-L catalysts was related to the rate at which the materials degraded. Particularly, the {100} facet leaches faster than the others, regardless of the material used. The catalytic activity strongly depended on the amount of leached elements in the liquid phase since these species are extremely active. Our work points to the instability of these materials under relevant reaction conditions and the necessity of additional treatments to improve their stability.
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Affiliation(s)
- Jose J. Delgado-Marín
- Instituto
de Materiales and Departamento de Química Inorgánica,
Facultad de Ciencias, Universidad de Alicante, Apdo. 99, Alicante 03080, Spain
| | - Alejandra Rendón-Patiño
- KAUST
Catalysis Center, Advanced Catalytic Materials, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Vijay Kumar Velisoju
- KAUST
Catalysis Center, Advanced Catalytic Materials, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Gadde Sathish Kumar
- KAUST
Catalysis Center, Advanced Catalytic Materials, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Naydu Zambrano
- KAUST
Catalysis Center, Advanced Catalytic Materials, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Magnus Rueping
- KAUST
Catalysis Center, Advanced Catalytic Materials, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Jorge Gascón
- KAUST
Catalysis Center, Advanced Catalytic Materials, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Pedro Castaño
- KAUST
Catalysis Center, Advanced Catalytic Materials, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
| | - Javier Narciso
- Instituto
de Materiales and Departamento de Química Inorgánica,
Facultad de Ciencias, Universidad de Alicante, Apdo. 99, Alicante 03080, Spain
| | - Enrique V. Ramos-Fernandez
- Instituto
de Materiales and Departamento de Química Inorgánica,
Facultad de Ciencias, Universidad de Alicante, Apdo. 99, Alicante 03080, Spain
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7
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Delgado-Marín JJ, Martín-García I, Villalgordo-Hernández D, Alonso F, Ramos-Fernández EV, Narciso J. Valorization of CO 2 through the Synthesis of Cyclic Carbonates Catalyzed by ZIFs. Molecules 2022; 27:molecules27227791. [PMID: 36431891 PMCID: PMC9699457 DOI: 10.3390/molecules27227791] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/07/2022] [Accepted: 11/09/2022] [Indexed: 11/16/2022] Open
Abstract
One way to exploit CO2 is to use it as a feedstock for the production of cyclic carbonates via its reaction with organic epoxides. As far as we know, there is still no heterogeneous catalyst that accelerates the reaction in a selective, efficient and industrially usable way. Cobalt and zinc-based zeolitic imidazole frameworks (ZIFs) have been explored as heterogeneous catalysts for this reaction. In particular, we have prepared ZIF-8 and ZIF-67 catalysts, which have been modified by partial replacement of 2-methylimidazole by 1,2,4-triazole, in order to introduce uncoordinated nitrogen groups with the metal. The catalysts have shown very good catalytic performance, within the best of the heterogeneous catalysts tested in the cycloaddition of CO2 with epichlorohydrin. The catalytic activity is due ultimately to defects on the outer surface of the crystal, and varies in the order of ZIF-67-m > ZIF-67 > ZiF-8-m = ZIF-8. Notably, reactions take place under mild reaction conditions and without the use of co-catalysts.
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Affiliation(s)
- José J. Delgado-Marín
- Instituto de Materiales, Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
| | - Iris Martín-García
- Instituto de Síntesis Orgánica, Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
| | - David Villalgordo-Hernández
- Instituto de Materiales, Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
| | - Francisco Alonso
- Instituto de Síntesis Orgánica, Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
| | - Enrique V. Ramos-Fernández
- Instituto de Materiales, Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
- Correspondence:
| | - Javier Narciso
- Instituto de Materiales, Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
- Instituto de Investigación Sanitaria Biomédica de Alicante (ISABIAL), 03690 Alicante, Spain
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8
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Delgado-Marín JJ, Narciso J, Ramos-Fernández EV. Effect of the Synthesis Conditions of MIL-100(Fe) on Its Catalytic Properties and Stability under Reaction Conditions. Materials (Basel) 2022; 15:6499. [PMID: 36143813 PMCID: PMC9501526 DOI: 10.3390/ma15186499] [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: 08/03/2022] [Revised: 09/10/2022] [Accepted: 09/14/2022] [Indexed: 06/16/2023]
Abstract
MIL-100(Fe) is a metal-organic framework (MOF) characterized by the presence of Lewis acid and Fe(II/III) redox sites. In this work, different synthesis methods for the preparation of MIL-100(Fe) are studied. Depending on the source of fluorine, different phases can be obtained: MIL-100(Fe) and an Fe trimesate with unknown structure which we call Fe(BTC). These materials were characterized using numerous techniques and applied in the reaction of CO2 cycloaddition with epichlorohydrin, a reaction catalyzed by Lewis acid sites. It was observed that samples with more Fe(BTC) phase were more active in the reaction. However, all samples, under reaction conditions, transformed into a less active phase.
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Affiliation(s)
- José J. Delgado-Marín
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain
| | - Javier Narciso
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain
- Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), 03690 Alicante, Spain
| | - Enrique V. Ramos-Fernández
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain
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Figueroa-Quintero L, Ramos-Fernandez EV, Narciso J. Synthesis and Characterization of the Metal–Organic Framework CIM-80 for Organic Compounds Adsorption. Materials 2022; 15:ma15155326. [PMID: 35955255 PMCID: PMC9369949 DOI: 10.3390/ma15155326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/27/2022] [Accepted: 07/28/2022] [Indexed: 02/04/2023]
Abstract
Metal–organic frameworks (MOF) are a new type of porous materials that have great potential for adsorption of voltaic organic compounds (VOCs). These types of materials composed of metal ions and organic ligands are easy to synthesize, have high surface areas, their surface chemistry can be adjusted to the desired application, and they can also have good chemical and thermal stability. Therefore, this work focuses on the synthesis of a highly hydrophobic MOF material called CIM-80, a porous material that is made up of the Al3+ cation and the mesaconate linker. This MOF has a B.E.T. of approximately 800 m2/g and has potential applications for the adsorption of hydrophobic organic compounds. However, its synthesis is expensive and very dirty. Therefore, we have studied the synthesis conditions necessary to achieve high synthesis yields (85%) and materials with high crystallinity and accessible porosity. To achieve these results, we have used urea as a mild deprotonation reagent and modulator as an alternative to NaOH, which is traditionally used for the synthesis of this MOF. Once the synthesis of this material was controlled, its adsorption/desorption behavior of water and organic compounds such as toluene, cyclohexane and m-xylene was studied by means of vapor adsorption isotherms. The results show the hydrophobic character of the material and the greater affinity the material has toward aliphatic compounds than toward aromatic ones, with toluene being the most adsorbed compound, followed by cyclohexane and m-xylene.
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Affiliation(s)
- Leidy Figueroa-Quintero
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain; (L.F.-Q.); (E.V.R.-F.)
| | - Enrique Vicente Ramos-Fernandez
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain; (L.F.-Q.); (E.V.R.-F.)
| | - Javier Narciso
- Laboratorio de Materiales Avanzados, Departamento de Química Inorgánica, Instituto Universitario de Materiales de Alicante, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain; (L.F.-Q.); (E.V.R.-F.)
- Instituto de Investigación Sanitaria y Biomédica de Alicante (ISABIAL), 03690 Alicante, Spain
- Correspondence:
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Delgado-Marín JJ, Izan DP, Molina-Sabio M, Ramos-Fernandez EV, Narciso J. New Generation of MOF-Monoliths Based on Metal Foams. Molecules 2022; 27:molecules27061968. [PMID: 35335331 PMCID: PMC8955634 DOI: 10.3390/molecules27061968] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 02/11/2022] [Revised: 03/08/2022] [Accepted: 03/16/2022] [Indexed: 11/24/2022] Open
Abstract
Herein, it has been developed a method to prepare metallic foams starting from Zamak5 (ZnAlCu alloy) with different pore sizes. The Zamak5 metallic foam is designed to serve as a support and metallic precursor of ZIF-8. In this way, composite materials MOF-metal can be prepared, these composites have a large number of application in energy exchange processe such as: adsorption or chemical reactions. Additionally, this method of sythesizing MOFs is environmentally friendly thanks to absence of solvents. Hanerssing the low melting point of the linker, the linker is infiltrated into the foam where the foam and the linker react to form the ZIF-8. In this way we have managed to transform part of the foam into ZIF-8 crystals that remain adhered to the foam. The foams have been characterized and modeled studying the mechanical and electrical properties, finding that both can be predected by various models. Among these, Ashby and Mortensen models for mechanical properties and Ashby and Percolation model for electrical properties stand.
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Saavedra Dias R, Barros AN, Silva AJ, Leitão JC, Narciso J, Costa AM, Tallon JM. The effect of school intervention programs on the body mass index of adolescents: a systematic review with meta-analysis. Health Educ Res 2020; 35:396-406. [PMID: 32772070 DOI: 10.1093/her/cyaa021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 06/27/2020] [Indexed: 06/11/2023]
Abstract
Effective obesity interventions in adolescent populations have been identified as an immediate priority action to stem the increasing prevalence of adult obesity. The purpose of this meta-analysis was to make a quantitative analysis of the impact of school-based interventions on body mass index during adolescence. Studies were retrieved from PubMed, Scopus, Science Direct and Web of Science databases. Results were pooled using a random-effects model with 95% confidence interval considered statistically significant. Of the 18 798 possible relevant articles identified, 12 articles were included in this meta-analysis. The global result showed a low magnitude effect, though it was statistically significant (N = 14 428), global e.s. = -0.055, P = 0.004 (95% CI = -0.092, -0.017). Heterogeneity was low among the studies (I2 = 9.017%). The funnel plot showed no evidence of publication bias. The rank-correlation test of Begg (P = 0.45641) and Egger's regression (P = 0.19459) confirmed the absence of bias. This meta-analysis reported a significant effect favoring the interventions; however, future research are needed since the reported the evidence was of low magnitude, with the studies following a substantial range of approaches and mostly had a modest methodological quality.
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Affiliation(s)
- R Saavedra Dias
- University of Trás-os-Montes and Alto Douro, Vila Real 5000-801, Portugal
| | - A N Barros
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes and Alto Douro (CITAB-UTAD), Vila Real 5000-801, Portugal
| | - A J Silva
- University of Trás-os-Montes and Alto Douro, Vila Real 5000-801, Portugal
- Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Vila Real 5000-801, Portugal
| | - J C Leitão
- University of Trás-os-Montes and Alto Douro, Vila Real 5000-801, Portugal
- Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Vila Real 5000-801, Portugal
| | - J Narciso
- University of Beira Interior, Rua Marquês D'Ávila e Bolama, Covilhã 6201-001, Portugal
| | - Aldo M Costa
- Center in Sports Sciences, Health Sciences and Human Development (CIDESD), Vila Real 5000-801, Portugal
- University of Beira Interior, Rua Marquês D'Ávila e Bolama, Covilhã 6201-001, Portugal
- Health Sciences Research Center (CICS-UBI), Covilhã, Portugal
| | - J M Tallon
- University of Trás-os-Montes and Alto Douro, Vila Real 5000-801, Portugal
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Giuranno D, Polkowski W, Bruzda G, Kudyba A, Narciso J. Interfacial phenomena between liquid Si-rich Si-Zr Alloys and Glassy Carbon. Materials (Basel) 2020; 13:ma13051194. [PMID: 32155942 PMCID: PMC7085108 DOI: 10.3390/ma13051194] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/03/2020] [Accepted: 03/06/2020] [Indexed: 11/23/2022]
Abstract
To succeed in the design and optimization of liquid-assisted processes such as reactive infiltration for the fabrication of tailored refractory SiC/ZrSi2 composites, the interfacial phenomena that occur when Si-rich Si-Zr alloys are in contact with glassy carbon (GC) were investigated for the first time by the sessile drop method at T = 1450 °C. Specifically, two different Si-rich Si-Zr alloys were selected, and the obtained results in terms of wettability, spreading kinetics, reactivity, and developed interface microstructures were compared with experimental observations that were previously obtained for the liquid Si-rich, Si-Zr, near-eutectic composition (i.e., Si-10 at.%Zr) that was processed under the same operating conditions. The increase of the Si content only weakly affected the overall phenomena that were observed at the interface. From the practical point of view, this means that even Si-Zr alloys with a higher Si content, with respect to the near eutectic alloy, may be potentially used as infiltrant materials.
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Affiliation(s)
- Donatella Giuranno
- Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council of Italy (CNR),Via De Marini 6, 16149 Genoa, Italy
- Łukasiewicz Research Network - Foundry Research Institute, Zakopiańska 73 Str., 30-418 Krakow, Poland; (W.P.); (G.B.); (A.K.)
- Correspondence: (D.G.); (J.N.)
| | - Wojciech Polkowski
- Łukasiewicz Research Network - Foundry Research Institute, Zakopiańska 73 Str., 30-418 Krakow, Poland; (W.P.); (G.B.); (A.K.)
| | - Grzegorz Bruzda
- Łukasiewicz Research Network - Foundry Research Institute, Zakopiańska 73 Str., 30-418 Krakow, Poland; (W.P.); (G.B.); (A.K.)
| | - Artur Kudyba
- Łukasiewicz Research Network - Foundry Research Institute, Zakopiańska 73 Str., 30-418 Krakow, Poland; (W.P.); (G.B.); (A.K.)
| | - Javier Narciso
- Instituto Universitario de Materiales de Alicante (IUMA), Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
- Departamento de Química Inorgánica, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
- Correspondence: (D.G.); (J.N.)
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Camarano AD, Giuranno D, Narciso J. New advanced SiC-based composite materials for use in highly oxidizing environments: Synthesis of SiC/IrSi3. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2019.10.018] [Citation(s) in RCA: 2] [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] [Indexed: 10/25/2022]
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Caccia M, Narciso J. On the effects of hot spot formation during MW-assisted synthesis of Cf/SiC composites by reactive melt infiltration: Experimental simulations through high temperature treatments. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2019.08.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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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Camarano A, Giuranno D, Narciso J. SiC-IrSi 3 for High Oxidation Resistance. Materials (Basel) 2019; 13:ma13010098. [PMID: 31878174 PMCID: PMC6981718 DOI: 10.3390/ma13010098] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 12/11/2019] [Accepted: 12/17/2019] [Indexed: 11/16/2022]
Abstract
SiC is a material with excellent mechanical and thermal properties but with a high production cost. Obtaining SiC by reactive infiltration is an attractive method with a much lower cost than the traditional sintering process. However, the reactive infiltration process presents a serious problem, which is the high residual silicon content, which decreases its applicability. The replacement of silicon with silicides is a widely used alternative. The present investigation shows the good mechanical properties of the SiC-IrSi3 composite material obtained by reactive infiltration of SiC-C preforms with Ir–Si alloys. The thermomechanical analysis shows a high compatibility of silicide with SiC. The presence of the silicide shows a substantial improvement against the oxidation of the SiC-Si composites.
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Affiliation(s)
- Antonio Camarano
- Instituto Universitario de Materiales de Alicante (IUMA), Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain;
| | - Donatella Giuranno
- Institute of Condensed Matter Chemistry and Energy Technologies (ICMATE), National Research Council of Italy (CNR), Via De Marini 6, 16149 Genoa, Italy
- Correspondence: (D.G.); (J.N.)
| | - Javier Narciso
- Instituto Universitario de Materiales de Alicante (IUMA), Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain;
- Departamento de Química Inorgánica, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
- Correspondence: (D.G.); (J.N.)
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Tallon JM, Saavedra R, Costa AM, Narciso J, Barros A, Silva AJ. P2 Nutrition Knowledge of Portuguese Adolescents – a Pilot Evaluation of the Impact of Using an Interactive Multimedia Platform to Provide Nutrition Education. Eur J Public Health 2019. [DOI: 10.1093/eurpub/ckz097.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- J M Tallon
- University of Trás-os-Montes e Alto Douro, Vila Real, PORTUGAL
| | - R Saavedra
- University of Trás-os-Montes e Alto Douro, Vila Real, PORTUGAL
| | - A M Costa
- University of Beira Interior, Covilhã, PORTUGAL
- Research Centre in Sports, Health and Human Development (CIDESD), Vila Real, PORTUGAL
- Health Science Research Center (CICS-UBI), Covilhã, PORTUGAL
| | - J Narciso
- University of Beira Interior, Covilhã, PORTUGAL
| | - A Barros
- University of Trás-os-Montes e Alto Douro, Vila Real, PORTUGAL
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), Vila Real, PORTUGAL
| | - A J Silva
- University of Trás-os-Montes e Alto Douro, Vila Real, PORTUGAL
- Research Centre in Sports, Health and Human Development (CIDESD), Vila Real, PORTUGAL
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18
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Caccia M, Giuranno D, Molina-Jorda JM, Moral M, Nowak R, Ricci E, Sobczak N, Narciso J, Fernández Sanz J. Graphene Translucency and Interfacial Interactions in the Gold/Graphene/SiC System. J Phys Chem Lett 2018; 9:3850-3855. [PMID: 29939752 DOI: 10.1021/acs.jpclett.8b01384] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Integration of graphene into electronic circuits through its joining with conventional metal electrodes (i.e., gold) appears to be one of the main technological challenges nowadays. To gain insight into this junction, we have studied the physicochemical interactions between SiC-supported graphene and a drop of molten gold. Using appropriate high-temperature experimental conditions, we perform wetting experiments and determine contact angles for gold drops supported on graphene epitaxially grown on 4H-SiC. The properties of the metal/graphene interface are analyzed using a wide variety of characterization techniques, along with computational simulations based on density functional theory. In contrast with the established literature, our outcomes clearly show that graphene is translucent in the gold/graphene/SiC interface, and therefore its integration into electronic circuits primarily depends on the right choice of the support to produce favorable wetting interactions with liquid gold.
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Affiliation(s)
- Mario Caccia
- Departamento de Química Inorgánica e Instituto Universitario de Materiales de Alicante , Universidad de Alicante , 03690 San Vicente del Raspeig , Alicante , Spain
| | - Donatella Giuranno
- Institute of Condensed Matter Chemistry and Energy Technologies (ICMATE) , National Research Council (CNR) , 16149 Genoa , Italy
| | - José M Molina-Jorda
- Departamento de Química Inorgánica e Instituto Universitario de Materiales de Alicante , Universidad de Alicante , 03690 San Vicente del Raspeig , Alicante , Spain
| | - Mónica Moral
- Departamento de Química Física , Universidad de Sevilla , 41004 Sevilla , Spain
| | - Rafal Nowak
- Foundry Research Institute , 30-418 Krakow , Poland
| | - Enrica Ricci
- Institute of Condensed Matter Chemistry and Energy Technologies (ICMATE) , National Research Council (CNR) , 16149 Genoa , Italy
| | | | - Javier Narciso
- Departamento de Química Inorgánica e Instituto Universitario de Materiales de Alicante , Universidad de Alicante , 03690 San Vicente del Raspeig , Alicante , Spain
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Molina JM, Rodríguez-Guerrero A, Louis E, Rodríguez-Reinoso F, Narciso J. Porosity Effect on Thermal Properties of Al-12 wt % Si/Graphite Composites. Materials (Basel) 2017; 10:ma10020177. [PMID: 28772536 PMCID: PMC5459103 DOI: 10.3390/ma10020177] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [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: 12/23/2016] [Revised: 01/24/2017] [Accepted: 02/08/2017] [Indexed: 11/16/2022]
Abstract
The effect of porosity on the thermal conductivity and the coefficient of thermal expansion of composites obtained by infiltration of Al-12 wt % Si alloy into graphite particulate preforms has been determined. Highly irregular graphite particles were used to fabricate the preforms. The thermal conductivity of these composites gradually increases with the applied infiltration pressure given the inherent reduction in porosity. A simple application of the Hasselman-Johnson model in a two-step procedure (that accounts for the presence of both graphite particles and voids randomly dispersed in a metallic matrix) offers a good estimation of the experimental results. As concerns the coefficient of thermal expansion, the results show a slight increase with saturation being approximately in the range 14.6–15.2 × 10−6 K−1 for a saturation varying from 86% up to 100%. Results lie within the standard Hashin-Strikman bounds.
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Affiliation(s)
- José-Miguel Molina
- Instituto Universitario de Materiales, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
- Departamento de Química Inorgánica, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
| | | | - Enrique Louis
- Instituto Universitario de Materiales, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
- Departamento de Física Aplicada, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
- Unidad Asociada del Consejo Superior de Investigaciones Científicas, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
| | - Francisco Rodríguez-Reinoso
- Instituto Universitario de Materiales, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
- Departamento de Química Inorgánica, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
| | - Javier Narciso
- Instituto Universitario de Materiales, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
- Departamento de Química Inorgánica, Universidad de Alicante, Apdo 99, Alicante E-03080, Spain.
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Novakovic R, Giuranno D, Caccia M, Amore S, Nowak R, Sobczak N, Narciso J, Ricci E. Thermodynamic, surface and structural properties of liquid Co-Si alloys. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.05.084] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Narciso J, Real M. Suicide attempts: Results from data collected in a psychiatric emergency ward in a general hospital. Eur Psychiatry 2016. [DOI: 10.1016/j.eurpsy.2016.01.2253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
IntroductionSuicide behavior constitutes a public health problem worldwide. It deserves epidemiological investigation regarding “best clinical practices”, and it is fundamental since the patient's first observation at psychiatric emergencies services. These are the ideal practices to start suicide prevention, and prevent further suicidal behavior. The improvement of healthcare quality includes the adoption of clinical guidelines, which support medical care since the emergencies services. The lack of specific instruments to evaluate suicidal risk urges the scientific community to create them.AimsThe authors aim to discuss the advantages and limitations of the application of these kinds of instruments, and the creation of models based in scientific evidence available.DiscussionFrom multiple available studies, the Modified Sad-Persons Scale (MSPS) seems to be one of the most scientifically used in literature, as well as in epidemiological studies of suicide attempts and their repetition, either by nonfatal or fatal attempts. However, even this scale has been questioned by experts, and the lack of specific and sensible tests towards suicide behavior and risk of suicide attempts raises the importance of the need of further investigation towards this area. This evidence would then help the clinician in his work at emergencies wards and provide better healthcare towards preventing new suicide attempts.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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Shah V, Narciso J, Zao J, Young-Tai K, Lee S. Use of T-Piece Resuscitator in the Delivery Room: Is it Feasible, Safe and Effective? Paediatr Child Health 2010. [DOI: 10.1093/pch/15.suppl_a.25a] [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: 11/14/2022] Open
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Vragovic I, Molina JM, Prieto R, Duarte M, Narciso J, Louis E. Debris and 1/f noise in sliding friction dynamics under wear conditions. Phys Rev E Stat Nonlin Soft Matter Phys 2009; 80:066123. [PMID: 20365247 DOI: 10.1103/physreve.80.066123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 10/13/2009] [Indexed: 05/29/2023]
Abstract
Friction force time series showing irregular fluctuations have been since long considered one of the possible stick-slip regimes in sliding friction. However, it has not been until recently that a 1/f power spectrum in friction force time series derived from sliding friction experiments under wear conditions has been identified. A variety of models, mostly inspired in the field of earthquakes, has been explored, without reaching a fully satisfactory explanation of that behavior. Recently, the present authors have reported results of sliding friction experiments on steel with alumina pins, carried out with and without debris blowing, that proved the role of loose debris in determining the 1/f character of the friction force. A damped-forced harmonic oscillator with two friction terms was proposed to describe the dynamics of friction under wear conditions: one purely random, which accounts for surface roughness, and another inversely proportional to the amount of loose debris that was calculated by means of a modified sand-pile model. This paper presents a full discussion of the experiments that allowed to reach that conclusion and of the model proposed to rationalize the results. In addition, the results of experiments devised to understand the transition from friction with debris to friction without debris (experiment initiated without blowing and after some time switching on blowing) and vice versa are reported. The results of further studies of the wear track are presented, namely, the variation in the track width with sliding distance and results of chemical analyses and surface roughness measurements of the track, for both with or without debris blowing experiments. These additional data give further support to the crucial role of debris in the 1/f character of the friction force.
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Affiliation(s)
- I Vragovic
- Departamento de Física Aplicada and Instituto Universitario de Materiales, Universidad de Alicante, San Vicente del Raspeig, Alicante, Spain
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Duarte M, Vragovic I, Molina JM, Prieto R, Narciso J, Louis E. 1/f Noise in sliding friction under wear conditions: the role of debris. Phys Rev Lett 2009; 102:045501. [PMID: 19257438 DOI: 10.1103/physrevlett.102.045501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2008] [Indexed: 05/27/2023]
Abstract
It has been shown that the friction force time series in sliding friction under wear conditions is self-similar and has a 1/f power spectrum. Albeit a variety of models, mostly inspired in the field of earthquakes, has been explored, an important factor was overlooked: the role of debris. This Letter describes sliding friction experiments on steel with alumina pins, carried out with and without debris blowing, that prove the role of loose debris in determining the 1/f character of the friction force. A damped-forced harmonic oscillator with two friction terms, one purely random and another inversely proportional to the amount of loose debris, calculated by means of a modified sandpile model, is proposed to describe the dynamics of friction under wear conditions.
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Affiliation(s)
- M Duarte
- Departamento de Física Aplicada and Instituto Universitario de Materiales, Universidad de Alicante, San Vicente del Raspeig, 03690 Alicante, Spain
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Stevens B, Johnston C, Taddio A, Jack A, Narciso J, Stremler R, Koren G, Aranda J. Management of pain from heel lance with lidocaine-prilocaine (EMLA) cream: is it safe and efficacious in preterm infants? J Dev Behav Pediatr 1999; 20:216-21. [PMID: 10475595 DOI: 10.1097/00004703-199908000-00003] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Hospitalized preterm infants undergo multiple painful heel lances. A two-phase, randomized, controlled trial was undertaken to determine the safety and efficacy of lidocaine-prilocaine 5% cream (EMLA, Astra Pharmaceuticals, L.P, Westborough, MA) for relieving pain from heel lance. One hundred twenty infants were randomly assigned to receive 0.5 g of EMLA or placebo cream for 30 minutes (Phase 1) or 60 minutes (Phase 2) before a routine heel lance. Efficacy was assessed using the Premature Infant Pain Profile (PIPP). Safety was determined by methemoglobin concentration 8 hours after EMLA application and by clinical signs of methemoglobinemia. No significant differences existed on PIPP scores between EMLA and placebo groups in Phase 1 (p < .480) or Phase 2 (p < .831). No infant had any clinical signs of methemoglobinemia. The mean methemoglobin concentration was 1.19% (.47). Approximately 10% of infants had minor skin reactions, and approximately 20% of EMLA-treated infants had blanching at the application site. The authors conclude that EMLA is safe but not efficacious for relieving pain from heel lance in preterm infants.
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Affiliation(s)
- B Stevens
- Faculties of Nursing and Medicine, University of Toronto, Department of Pediatrics, The Hospital for Sick Children, Ontario, Canada.
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Narciso J, Garc�a-Cordovilla C, Louis E. Effects of temperature on pressure infiltration of packed SiC particulates by liquid aluminium. ACTA ACUST UNITED AC 1995. [DOI: 10.1007/bf00423386] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [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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Narciso J, Alonso A, Pamies A, Garcia-Cordovilla C, Louis E. Wettability of binary and ternary alloys of the system Al-Si-Mg with SiC particulates. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0956-716x(94)90063-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Alonso A, Narciso J, Pamies A, Garcia-Cordovilla C, Louis E. Effect of K2ZrF6 coatings on pressure infiltration of packed SiC particulates by liquid aluminum. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/0956-716x(93)90277-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Brass CA, Crawford JM, Narciso J, Gollan JL. Hypoxic liver injury and the ameliorating effects of fructose: the "glucose paradox" revisited. Am J Physiol 1992; 263:G293-300. [PMID: 1415541 DOI: 10.1152/ajpgi.1992.263.3.g293] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
It has been independently postulated that nutritional status is a modulator of the hepatic injury response to hypoxia and that glucose may be a poor substrate for hepatocellular metabolism. This study provides data linking these two concepts within the framework of metabolic zonation of the liver. With the use of a hypoxically perfused isolated rat liver model, cellular injury, as reflected by aspartate aminotransferase (AST) release, was significantly greater in the liver of fasted (mean AST 489 U/g liver at 3 h) than fed (40 U/g) animals. The extent of injury during hypoxia was decreased to a comparable degree in fasted livers perfused with Wisconsin solution (27 U/g) or 20 mM fructose (51 U/g). Perfusion with (11.5 mM) glucose plus insulin provided no hepatoprotection (791 U/g); however, supraphysiological amounts of glucose (100 mM) with (310 U/g) or without (321 U/g) insulin (10 U) or dihydroxyacetone (220 U/g) provided a modest reduction in AST release. Cellular injury measured by trypan blue uptake showed a marked zonal pattern, with upstream regions incurring greater parenchymal and nonparenchymal injury than downstream areas. These data that indicate that exogenous glucose is poorly utilized as an energy substrate by the liver during hypoxia are consistent with data from the fasted-refed rat model, suggesting a "glucose paradox" in the liver. The findings also suggest that low levels of oxygen are an important factor mediating "hypoxic" liver injury.
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Affiliation(s)
- C A Brass
- Brigham and Women's Hospital, Department of Medicine, Harvard Medical School, Boston, Massachusetts
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Narciso J, Abecasis P, Ribeiro J, Mota JC. [Tetanus. A review of 54 cases]. ACTA MEDICA PORT 1992; 5:251-4. [PMID: 1502936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Tetanus continues to be a frequent illness with a high rate of mortality which mainly affects the elderly. In view of this, 54 cases treated in the ICU between 1983 and 1991 were studied. The clinical support with mechanical ventilation and the use of new drugs, which allowed for a more satisfactory sedation and muscular relaxation, and which permitted the control of the autonomic overactivity, were the most determinant factors in the reduction of mortality verified in the late years of our practice.
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Affiliation(s)
- J Narciso
- Unidade de Cuidados Intensivos, Hospital Curry Cabral, Lisboa
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Brass CA, Narciso J, Gollan JL. Enhanced activity of the free radical producing enzyme xanthine oxidase in hypoxic rat liver. Regulation and pathophysiologic significance. J Clin Invest 1991; 87:424-31. [PMID: 1991828 PMCID: PMC295093 DOI: 10.1172/jci115013] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
It has been widely proposed that conversion of xanthine dehydrogenase (XDH) to its free radical-producing form, xanthine oxidase (XOD), underlies ischemic/reperfusion injury, although the relationship of this conversion to hypoxia and its physiologic control have not been defined. This study details the time course and control of this enzymatic interconversion. In a functionally intact, isolated perfused rat liver model, mean % XOD activity increased as a function of both the duration (25 to 45% in 3 h) and degree (r = 0.97) of hypoxia. This process was markedly accelerated in ischemic liver by an overnight fast (45 vs. 30% at 2 h), and by imposing a short period of in vivo ischemia (cardiopulmonary arrest 72%). Moreover, only under these conditions was there a significant rise in the XOD activity due to the conformationally altered XDH molecule (XODc, 18%), as well as concomitant morphologic injury. Neither circulating white blood cells nor thrombosis appeared to contribute to the effects of in vivo ischemia on enzyme conversion. Thus, it is apparent that conversion to the free radical-producing state, with high levels of XOD activity and concurrent cellular injury, can be achieved during a relatively short period of hypoxia under certain well-defined physiologic conditions, in a time course consistent with its purported role in modulating reperfusion injury. These data also suggest that the premorbid condition of organ donors (e.g., nutritional status and relative state of hypoxia) is important in achieving optimal organ preservation.
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Affiliation(s)
- C A Brass
- Gastroenterology Division, Brigham and Women's Hospital, Boston, Massachusetts
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