Search results for "Hydrophilicity"

showing 5 items of 5 documents

Preparation and photoactivity of samarium loaded anatase, brookite and rutile catalysts

2011

Abstract Pure and samarium loaded anatase, brookite and rutile nanopowders were synthesized by thermohydrolysis of TiCl 4 . The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area (SSA) determination, UV–vis diffuse reflectance spectroscopy (DRS), atomic force microscopy (AFM), contact angle (CA) measurements and photoluminescence (PL) spectroscopy. The photocatalytic activity of pure and Sm-loaded TiO 2 polymorphs was investigated by employing the photodegradation of 4-nitrophenol as probe reaction in a liquid-solid system. Loading with Sm resulted in an improvement of the photoreactivity of the three TiO 2 polymorphs. The benefi…

AnataseMaterials scienceSuperhydrophilicitychemistry.chemical_elementDip-coatingCatalysisContact anglechemistry.chemical_compoundOpticsTitanium dioxide; PhotocatalysisTitanium dioxide Photocatalysis Samarium-loaded TiO2 SuperhydrophilicityPhotocatalysisGeneral Environmental Sciencebusiness.industryBrookiteProcess Chemistry and TechnologySamarium-loaded TiO2SamariumChemical engineeringchemistrySamarium-loaded TiO(2)visual_artX-ray crystallographyTitanium dioxidePhotocatalysisvisual_art.visual_art_mediumTitanium dioxideSettore CHIM/07 - Fondamenti Chimici Delle TecnologiePhotocatalysis; Samarium-loaded TiO2; Superhydrophilicity; Titanium dioxide;businessApplied Catalysis B: Environmental
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Influence of gas environment on the dynamics of wetting transition of laser-textured stainless steel meshes

2021

We analyze the role of surrounding gas and aging in ambient air in the wettability behavior of laser-processed stainless steel meshes. Laser texturing of meshes was carried out in the presence of different gases (N2, O2, CO2, Ar, and SF6) in ambient atmospheric air and under different vacuum conditions. The influence of each gas on the evolution of the wettability properties after aging in ambient air is analyzed. The effects of low-pressure and vacuum aging allowed transforming the initial superhydrophilic characteristics of the laser-structured meshes to an almost superhydrophobic state.

Atmospheric airMaterials sciencePhysicsQC1-999General Physics and AstronomyLaserAmbient airlaw.inventionWetting transitionSuperhydrophilicitylawPolygon meshWettingComposite materialAIP Advances
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Fabrication of zinc doped aluminium oxide/polysulfone mixed matrix membranes for enhanced antifouling property and heavy metal removal

2021

International audience; Heavy metal removal from water resources is essential for environmental protection and the production of safe drinking water. In this direction, Zinc doped Aluminium Oxide (Zn:Al2O3) nanoparticles were incorporated into Polysulfone (PSf) to prepare mixed matrix membranes for the efficient removal of heavy metals from water. These Zn:Al2O3 nanoparticles prepared by the solution combustion method have a very high surface area (261.44 m2/g) with an approximate size of 50 nm. X-ray Photoelectron Spectroscopy analysis showed that the Al and Zn were in +3 and + 2 oxidation states, respectively. Cross-sectional Scanning Electron Microscopy images revealed the finger-like mo…

Environmental EngineeringMaterials sciencePolymersAnti-fouling studyHealth Toxicology and Mutagenesis0208 environmental biotechnologyNanoparticlechemistry.chemical_element02 engineering and technologyZinc010501 environmental sciences01 natural sciencesMetalchemistry.chemical_compoundMixed matrix membranesMetals HeavyAluminum OxideEnvironmental Chemistry[CHIM]Chemical SciencesSulfonesSurface chargePolysulfonePorosityHydrophilicity0105 earth and related environmental sciencesPublic Health Environmental and Occupational HealthMembranes ArtificialGeneral MedicineGeneral ChemistryPollution6. Clean water020801 environmental engineeringZincCross-Sectional StudiesMembraneChemical engineeringchemistry13. Climate actionHeavy metal ionsvisual_artvisual_art.visual_art_mediumAluminium oxide
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Optical Gating of Photosensitive Synthetic Ion Channels

2011

4-oxo-4-(pyren-4-ylmethoxy) butanoic acid is used as a photolabile protecting group to show the optical gating of nanofluidic devices based on synthetic ion channels. The inner surface of the channels is decorated with monolayers of photolabile hydrophobic molecules that can be removed by irradiation, which leads to the generation of hydrophilic groups. This process can be exploited in the UV-light-triggered permselective transport of ionic species in aqueous solution through the channels. The optical gating of a single conical nanochannel and multichannel polymeric membranes is characterised experimentally and theoretically by means of current-voltage and selective permeation measurements,…

Hydrophilic groupsMaterials scienceSynthetic ion channelsLight sensitive materialsHydrophobicitySynthetic membraneNanotechnologyNano-fluidic devicesGatingIonIonic transportsBiomaterialsPolymeric membranesOptical gatingPhotosensitivityOptical gatingsSynthetic ion channelsMonolayerElectrochemistryControlled releasePhotolabile protecting groupsIonic speciesPolymer membranesHydrophobic moleculesFunctional polymersSelective permeationHydrophilicityMultifunctional devicesMonolayersIonsAqueous solutionCurrent rectificationUV-light irradiationMulti-channelPermeationCondensed Matter PhysicsNanostructuresElectronic Optical and Magnetic MaterialsData processingPhotosensitive nanostructuresFISICA APLICADAIrradiationNano channelsInner surfacesFunctional polymersCurrent voltageAdvanced Functional Materials
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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