Search results for "polymer"

showing 10 items of 10504 documents

Copper( ii ) complexes with phosphorylated 1,10-phenanthrolines: from molecules to infinite supramolecular arrays

2016

International audience; The reaction of phosphorylated 1,10-phenanthrolines 3-Pphen, 3,8-Pphen and 4,7-Pphen (3-Pphen = 3-diethoxyphosphorylphenanthroline, 3,8-Pphen = 3,8-bis(diethoxyphosphoryl) phenanthroline, 4,7-Pphen = 4,7-bis(diethoxyphosphoryl) phenanthroline) and hydrated copper(II) nitrate in a 1 : 1 ratio leads to the formation of supramolecular architectures. In the 1D coordination polymer [Cu(3-Pphen)(NO3)(2)](n) (2) the copper atom is coordinated to only one phenanthroline ligand and the coordination sphere is completed by two oxygen atoms of nitrate anions and the oxygen atom of the phosphoryl group from the neighbouring phenanthroline ligand. Complex Cu(3,8-Pphen)(NO3)(2) (3)…

constructionCoordination sphereStereochemistryCoordination polymerPhenanthrolinebidentate ligandsdesignSupramolecular chemistryEtherCrystal structuremagnetic-properties010402 general chemistrychemistry01 natural sciences[ CHIM ] Chemical SciencesCatalysischemistry.chemical_compoundMaterials Chemistry[CHIM]Chemical Sciencesmetal-organic frameworks010405 organic chemistryLigandChemistrycrystal-structureGeneral Chemistryself-organization0104 chemical sciences3. Good healthtransition-metalCrystallographycoordination polymersMetal-organic framework
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Innovative Recycling of Lime Slaker Grits from Paper-Pulp Industry Reused as Aggregate in Ambient Cured Biomass Fly Ash-Based Geopolymers for Sustain…

2019

Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-pulp industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1&ndash

constructionSorptivitygeopolymer concrete020209 energyGeography Planning and Developmentlcsh:TJ807-830lcsh:Renewable energy sourcesSettore ICAR/10 - Architettura Tecnica02 engineering and technology010501 environmental sciencesManagement Monitoring Policy and LawReuseengineering.materialrecyclinglime slaker grit01 natural sciences0202 electrical engineering electronic engineering information engineeringMetakaolinbiomass fly ashlcsh:Environmental sciences0105 earth and related environmental sciencesLimelcsh:GE1-350Waste managementRenewable Energy Sustainability and the Environmentlime slaker gritslcsh:Environmental effects of industries and plantspaper-pulp industryCompressive strengthlcsh:TD194-195Fly ashengineeringEnvironmental scienceMortarKraft paperSustainability
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Selection of novel geopolymeric mortars for sustainable construction applications using fuzzy topsis approach

2020

Construction is recognized as one of the most polluting and energy consuming industries worldwide, especially in developing countries. Therefore, Research and Development (R&amp

constructionmulti criteria analysisComputer scienceFuzzy topsisGeography Planning and Developmentlcsh:TJ807-8300211 other engineering and technologieslcsh:Renewable energy sourcesBiomassSettore ICAR/10 - Architettura Tecnica02 engineering and technology010501 environmental sciencesManagement Monitoring Policy and Lawengineering.materialReuseRaw material01 natural sciencesStructural elementFiller (materials)021105 building & constructionSettore ING-IND/17 - Impianti Industriali MeccaniciProcess engineeringlcsh:Environmental sciences0105 earth and related environmental scienceswastes valorization & reuseConstruction; Fuzzy topsis; Mortars; Multi criteria analysis; Sustainable geopolymers; Wastes valorization & reuselcsh:GE1-350Renewable Energy Sustainability and the Environmentbusiness.industrylcsh:Environmental effects of industries and plantsWastes valorization &ampmortarsreuselcsh:TD194-195Fly ashsustainable geopolymersengineeringMortarbusinessfuzzy TopsisSludge
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Interplay between spin transition and gas sorption in compartmentalized coordination polymers

2019

El trabajo descrito en esta tesis se enmarca dentro de los polímeros de coordinación compartimentalizados. Los polímeros de coordinación son materiales híbridos orgánicos-inorgánicos formados por un metal rodeado por unos ligandos orgánicos unidos mediante enlace de coordinación y se pueden obtener estructuras que se extienden en una, dos o tres direcciones del espacio. Las infinitas posibilidades que existen debido a la gran variedad de metales disponibles y especialmente, a la posibilidad de sintetizar múltiples ligandos orgánicos permite diseñar químicamente materiales con propiedades “a la carta”, además de la posibilidad de presentar multifuncionalidad, esto es, la combinación de diver…

coordination polymersUNESCO::QUÍMICA::Química inorgánicacrystal growing:QUÍMICA::Química inorgánica [UNESCO]mofs
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Inverted molecular cups: 1-D and 2-D Ag(I) coordination polymers from resorcinarene bis-thiacrowns

2016

Resorcinarene bis-thiacrown hosts 1–3 were prepared and crystallized with silver trifluoroacetate yielding one and two dimensional Ag coordination polymers. The complexation of silver in exo-cavity fashion folds the thiacrown bridges inwards transforming the resorcinarene hosts into inverted molecular cups. The silver cations were coordinated to the resorcinarene ligands and trifluoroacetate anions, which act as monodentate or bidendate bridging ligands between the metal ions. Argentophilic Ag···Ag (2.93–3.38 Å) interactions supported by two bridging carboxylate anions were found in two of the structures, whereas longer Ag···Ag distances were observed if only one anion connected the silver …

coordination polymersresorcinarenesmacrocyclic ligands
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Magnetic materials based on coordination chemistry: from switching molecules to multifunctional magnets

2021

Esta tesis tiene como objetivo principal la preparación de materiales moleculares multifuncionales magnéticos. Para ello se han usado dos estrategias diferentes: una aproximación iónica, en la que se han preparado sales de cationes funcionales y se han combinado con redes aniónicas extendidas (capítulos 2 y 3); y la segunda estrategia, donde, a través de enlaces covalentes entre ligandos funcionales y fulerenos (capitulo 4), o polioxometalatos (capítulo 5) se han obtenido sistemas que presentan la propiedad de transición de espín con efectos sinérgicos. En el capítulo 2 se presenta la síntesis y caracterización de varios polímeros de coordinación basados en el ligando anilato con cationes i…

coordination polymersspin crossovermagnetismUNESCO::QUÍMICA:QUÍMICA [UNESCO]
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Hybrid magnetic materials based on coordination chemistry: from switching magnetic molecules to 2D coordination polymers

2015

El trabajo descrito en esta tesis se encuadra en el ámbito de los materiales moleculares. Presenta varias estrategias para preparar nuevos materiales híbridos multifuncionales. Los complejos de transición de espín (SCO) constituyen uno de los ejemplos más espectaculares de biestabilidad molecular. En estos sistemas, las transiciones entre los estados de bajo espín (LS) y alto espín (HS) pueden estar inducidos por una variedad de estímulos externos (temperatura, presión o radiación electromagnética). Además de los interesantes aspectos fundamentales, este fenómeno es de interés creciente en el área de los materiales funcionales debido a las posibles aplicaciones en sensores, memorias o dispo…

coordination polymersspin-crossoverUNESCO::QUÍMICAcoordination chemistrymultifunctional materials:QUÍMICA [UNESCO]
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Modulating the Self-assembly of Block Copolymers by Selective Cyclodextrins

2009

copolymer cyclodextrin SANS thermodynamicSettore CHIM/02 - Chimica Fisica
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Effect on the block copolymer self-assembling in water of block selective cyclodextrin addition

2008

copolymer cyclodextrin SANSSettore CHIM/02 - Chimica Fisica
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AQUEOUS MIXTURES OF A THERMOSENSITIVE CATIONIC BLOCK COPOLYMER AND CYCLODEXTRINS. INCLUSION COMPLEXES FORMATION.

2010

copolymer cyclodextrin scattering
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