Search results for "mof"

Numerical assessment of the thermal-hydraulic performances of the ITER Blanket cooling system

This thesis has covered the main research activities carried out during the candidate Ph.D. course of the XXXI Cycle on “Energia e Tecnologie dell’Informazione - curriculum Fisica Tecnica e Ingegneria Nucleare” (Energy and Information Technologies - Applied Physics and Nuclear Engineering curriculum), held at the University of Palermo, in the time frame that goes from the end of 2015 to the end of 2018. In particular, it focusses on the activities carried out at the DEIM in cooperation with the ITER Organisation on the “Hydraulic Analysis of Blanket Cooling System” and it has aimed to investigate the thermal-hydraulic behaviour of the ITER blanket cooling system under nominal steady-state c…

Tuning the selectivity of light hydrocarbons in natural gas in a family of isoreticular MOFs

2017

Purification of methane from other light hydrocarbons in natural gas is a topic of intense research due to its fundamental importance in the utilization of natural gas fields. Porous materials have emerged as excellent alternative platforms to conventional cryogenic methodologies to perform this task in a cost- and energy-efficient manner. Here we report a new family of isoreticular chiral MOFs, prepared from oxamidato ligands derived from natural amino acids L-alanine, L-valine and L-leucine, where, by increasing the length of the alkyl residue of the amino acid, the charge density of the MOF's channels can be tuned (1 > 2 > 3), decreasing the adsorption preference towards methane over lig…

Higher Fluid Balance Increases the Risk of Death From Sepsis: Results From a Large International Audit

2017

Contains fulltext : 177598.pdf (Publisher’s version ) (Closed access) OBJECTIVES: Excessive fluid therapy in patients with sepsis may be associated with risks that outweigh any benefit. We investigated the possible influence of early fluid balance on outcome in a large international database of ICU patients with sepsis. DESIGN: Observational cohort study. SETTING: Seven hundred and thirty ICUs in 84 countries. PATIENTS: All adult patients admitted between May 8 and May 18, 2012, except admissions for routine postoperative surveillance. For this analysis, we included only the 1,808 patients with an admission diagnosis of sepsis. Patients were stratified according to quartiles of cumulative f…

Ortodonzia estetica: vantaggi e limiti della tecnica Invisalign

2013

Riassunto Obiettivi Lo scopo di questo lavoro e definire vantaggi e limiti della tecnica Invisalign rispetto a metodiche ortodontiche tradizionali. Materiali e metodi E stata condotta una revisione sistematica della letteratura attraverso l’uso di diversi database, come MedLine, PubMed, Scopus. La ricerca copre il periodo che intercorre tra il 2000 e il 2011. Altre fonti sono state selezionate dai riferimenti bibliografici citati nei lavori consultati. Risultati e conclusioni La ricerca scientifica ha portato negli anni allo sviluppo di soluzioni atte a soddisfare esigenze estetiche e funzionali, a partire dai bracket in ceramica e dalla tecnica linguale fino ad arrivare negli anni Novanta …

Protocolo de Desigualdad

2021

El siguiente "fanzine" es el resultado gráfico del evento "Hackatón Igualxs", celebrado en la Facultad de Geografía e Historia en abril de 2021. "Protocolo de Desigualdad" recoge de forma visual los temas tocados durante el hackatón sobre el tema de la igualdad e identidad de género en el ámbito universitario. Ha sido realizado por los participantes al evento bajo la supervisión de Roberto Riccardo Alvau, Juan de Dios Hernández Martínez, Florencia Prone y This 'fanzine' is the graphic product of the event "Hackatón Igualxs", which took place at the Facultad de Geografía e Historia (UV) in April 2021. 'Protocolo de Desigualdad' (Protocol of Inequality) is a visual collection of the issues di…

Influence of thermally induced structural transformations on the magnetic and luminescence properties of tartrate-based chiral lanthanide organic-fra…

2020

This work reports on the synthesis and characterization of five enantiomeric pairs of isostructural 3D metal-organic frameworks (MOFs) with the general formula {[Ln2(μ4-tar)2(μ-tar)(H2O)2]·xH2O}n [where Ln(iii) = Tb (Tb-L and Tb-D), Dy (Dy-L and Dy-D), Ho (Ho-L and Ho-D), Er (Er-L and Er-D) and Tm (Tm-L and Tm-D); tar = tartrate (d- or l-) and x = 3 or 4 depending on the counterpart], which possess interesting luminescence and magnetic properties. These MOFs undergo progressive and reversible dehydration processes upon controlled heating yielding three crystalline phases (Ln-L′, Ln-L′′ and Ln-L′′′). Alternating current magnetic measurements on Tb, Dy and Er-based compounds exhibit field ind…

Breathing-Dependent Redox Activity in a Tetrathiafulvalene-Based Metal–Organic Framework

2018

"Breathing" metal-organic frameworks (MOFs) that involve changes in their structural and physical properties upon an external stimulus are an interesting class of crystalline materials due to their range of potential applications including chemical sensors. The addition of redox activity opens up a new pathway for multifunctional "breathing" frameworks. Herein, we report the continuous breathing behavior of a tetrathiafulvalene (TTF)-based MOF, namely MUV-2, showing a reversible swelling (up to ca. 40% of the volume cell) upon solvent adsorption. Importantly, the planarity of the TTF linkers is influenced by the breathing behavior of the MOF, directly impacting on its electrochemical proper…

Present and Perspectives of Photoactive Porous Composites Based on Semiconductor Nanocrystals and Metal-Organic Frameworks

2021

This review focuses on the recent developments in synthesis, properties, and applications of a relatively new family of photoactive porous composites, integrated by metal halide perovskite (MHP) nanocrystals and metal-organic frameworks (MOFs). The synergy between the two systems has led to materials (MHP@MOF composites) with new functionalities along with improved properties and phase stability, thus broadening their applications in multiple areas of research such as sensing, light-harvesting solar cells, light-emitting device technology, encryption, and photocatalysis. The state of the art, recent progress, and most promising routes for future research on these photoactive porous composit…

MOF DERIVATIVES AS MOLECULAR TOOLS TO TRAP METAL AZIDES

2012

Coordination networks incorporating halogen-bond donor sites and azobenzene groups

2016

Two Zn coordination networks, {[Zn(1)(Py)2]2(2-propanol)}n (3) and {[Zn(1)2(Bipy)2](DMF)2}n (4), incorporating halogen-bond (XB) donor sites and azobenzene groups have been synthesized and fully characterized. Obtaining 3 and 4 confirms that it is possible to use a ligand wherein its coordination bond acceptor sites and XB donor sites are on the same molecular scaffold (i.e., an aromatic ring) without interfering with each other. We demonstrate that XBs play a fundamental role in the architectures and properties of the obtained coordination networks. In 3, XBs promote the formation of 2D supramolecular layers, which, by overlapping each other, allow the incorporation of 2-propanol as a gues…