Search results for "Porous structures"

showing 5 items of 5 documents

Visible light photocatalytic activity of macro-mesoporous TiO2-CeO2inverse opals

2018

Macro-mesoporous TiO2 inverse opal materials were synthesized and they were tested as photocatalysts under visible light irradiation. The influence of cerium oxide addition towards the Rhodamine B (RhB) photodegradation activity was evaluated. Structural, textural, spectral and surface properties of the TiO2-CeO2 inverse opal nanocomposites were studied by XRD, XPS, SEM, TEM, N2 adsorption-desorption, Diffuse Reflectance UV–vis and Photoluminescence spectroscopies. Compared to commercial TiO2 anatase, the macro-mesoporous TiO2 inverse opal exhibited six times higher kinetic rate constant in the RhB degradation under visible light irradiation. The good photocatalytic activity was related to …

AnataseCerium oxideRhodamine BGeneral Chemical EngineeringInorganic chemistryGeneral Physics and Astronomy02 engineering and technologyAdvanced oxidation process010402 general chemistryPorous structure01 natural sciencesNanomaterialschemistry.chemical_compoundPhysics and Astronomy (all)PhotocatalysiChemical Engineering (all)PhotocatalysisPhotodegradationChemistryPhotonic effectChemistry (all)General ChemistryCerium oxidePorous structures021001 nanoscience & nanotechnology0104 chemical sciencesChemical engineeringAdvanced oxidation process; Cerium oxide; Photocatalysis; Photonic effect; Porous structures; Rhodamine B; Titanium dioxide; Chemistry (all); Chemical Engineering (all); Physics and Astronomy (all)Titanium dioxidePhotocatalysisAdvanced oxidation proceTitanium dioxideSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologyMesoporous materialVisible spectrum
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Designed biodegradable hydrogel structures prepared by stereolithography using poly(ethylene glycol)/poly(D,L-lactide)-based resins

2010

Designed three-dimensional biodegradable poly(ethylene glycol)/poly(D,L-lactide) hydrogel structures were prepared for the first time by stereolithography at high resolutions. A photo-polymerisable aqueous resin comprising PDLLA-PEG-PDLLA-based macromer, visible light photo-initiator, dye and inhibitor in DMSO/water was used to build the structures. Porous and non-porous hydrogels with well-defined architectures and good mechanical properties were prepared. Porous hydrogel structures with a gyroid pore network architecture showed narrow pore size distributions, excellent pore interconnectivity and good mechanical properties. The structures showed good cell seeding characteristics, and human…

IR-80283Materials scienceStereolithographyPolyestersPharmaceutical ScienceDesigned porous structuresSCAFFOLDSHydrogel Polyethylene Glycol Dimethacrylatelaw.inventionPolyethylene GlycolsMacromer photo-polymerisationCONSTRUCTSchemistry.chemical_compoundMETIS-272859lawPolymer chemistryGLYCOL)Cell Adhesionmacromer photopolymerisationHumansTissue engineeringPorosityStereolithographyAqueous solutiontechnology industry and agricultureMesenchymal Stem CellsMacromonomerResins SyntheticPhotopolymerBiodegradation EnvironmentalchemistryChemical engineeringBiodegradable hydrogelsSelf-healing hydrogelsCELLS090301 BiomaterialsEthylene glycolGyroid
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Photocatalytic H2 production over inverse opal TiO2 catalysts

2019

Abstract The influence of BiVO4 and CuO on the chemico-physical properties of TiO2-based systems is reported. The performances of these systems were investigated in the photocatalytic H2 production both under UV and solar light irradiation. The characterization data pointed out that the obtained TiO2 samples have highly porous inverse opal structures with interconnected macropores. Inverse opal TiO2 exhibited higher activity in the H2 production than the commercial TiO2 due to the peculiar porosity that allows photons to enter inside the photocatalyst. A further improvement in terms of photoactivity was verified by addition of increasing amounts of BiVO4. On the contrary a small CuO content…

Materials science02 engineering and technologyRadiationPorous structure010402 general chemistry01 natural sciencesCatalysisCatalysiCatalysisPhotocatalysiIrradiationPhotocatalysisWater splittingAbsorption (electromagnetic radiation)PorosityMacroporePhotonic effectChemistry (all)General ChemistryPorous structures021001 nanoscience & nanotechnology0104 chemical sciencesCharacterization (materials science)Chemical engineeringPhotocatalysisTitanium dioxideSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologyPhotocatalysis; Photonic effect; Porous structures; Titanium dioxide; Water splitting; Catalysis; Chemistry (all)Catalysis Today
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POLYMERIC POROUS STRUCTURES VIA PHASE SEPARATION

2012

Settore ING-IND/22 - Scienza E Tecnologia Dei MaterialiPOLYMERICPOROUS STRUCTURES
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Effect of Polyhydroxyalkanoate (PHA) Concentration on Polymeric Scaffolds Based on Blends of Poly-L-Lactic Acid (PLLA) and PHA Prepared via Thermally…

2022

Hybrid porous scaffolds composed of both natural and synthetic biopolymers have demonstrated significant improvements in the tissue engineering field. This study investigates for the first time the fabrication route and characterization of poly-L-lactic acid scaffolds blended with polyhydroxyalkanoate up to 30 wt%. The hybrid scaffolds were prepared by a thermally induced phase separation method starting from ternary solutions. The microstructure of the hybrid porous structures was analyzed by scanning electron microscopy and related to the blend composition. The porosity and the wettability of the scaffolds were evaluated through gravimetric and water contact angle measurements, respective…

biopolymer blends porous structures scaffold thermally induced phase separation tissue engineeringPolymers and Plasticstissue engineering; biopolymer blends; porous structures; scaffold; thermally induced phase separationSettore ING-IND/34 - Bioingegneria IndustrialeGeneral ChemistryPolymers; Volume 14; Issue 12; Pages: 2494
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