Search results for "hydration layer"

showing 3 items of 3 documents

Three-dimensional hydration layer mapping on the (10.4) surface of calcite using amplitude modulation atomic force microscopy

2014

Calcite, the most stable modification of calcium carbonate, is a major mineral in nature. It is, therefore, highly relevant in a broad range of fields such as biomineralization, sea water desalination and oil production. Knowledge of the surface structure and reactivity of the most stable cleavage plane, calcite (10.4), is pivotal for understanding the role of calcite in these diverse areas. Given the fact that most biological processes and technical applications take place in an aqueous environment, perhaps the most basic - yet decisive - question addresses the interaction of water molecules with the calcite (10.4) surface. In this work, amplitude modulation atomic force microscopy is used…

CalciteSurface (mathematics)Work (thermodynamics)solid-liquid interfaceAqueous solutionMineralMaterials sciencehydration layerMechanical EngineeringMineralogyBioengineeringGeneral Chemistry530chemistry.chemical_compoundCalcium carbonatechemistry3D mappingMechanics of MaterialsMoleculeGeneral Materials ScienceAFMElectrical and Electronic EngineeringcalciteBiomineralizationNanotechnology
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The effect of hydration layers on the anodic growth and on the dielectric properties of Al2O3 for electrolytic capacitors

2014

Hydrous films were grown on high purity and cubicity Al foils for electrolytic capacitors in deionized water, ethylene glycol - deionized water and in glycerol - deionized water for different immersion times. According to the X-ray diffraction patterns the hydration treatment allowed to grow a pseudo boehmite layer on Al surface whose morphology is appreciably affected by the bath composition. Capacitance measurements and photoelectrochemical findings suggest that a more compact barrier layer forms during the immersion in alcohol containing solutions. The hydration in water allowed to save energy and to prepare more blocking oxide films. The beneficial effect of hydration in hot water on th…

Electrolytic capacitorBoehmiteMaterials scienceInorganic chemistryMetals and AlloysOxideSurfaces and InterfacesDielectricSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsAmorphous solidlaw.inventionAnodeBarrier layerchemistry.chemical_compoundSettore ING-IND/23 - Chimica Fisica ApplicatachemistrylawMaterials ChemistryAnodic aluminaDielectricSurface treatmentCrystallizationhydration layers anodic film of Al2O3 dielectric properties electrolytic capacitors photoelectrochemical characterization
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Dynamics of hyaluronan aqueous solutions as assessed by fast field cycling NMR relaxometry.

2010

Fast field cycling (FFC) NMR relaxometry has been used to study the conformational properties of aqueous solutions of hyaluronan (HYA) at three concentrations in the range 10 to 25 mg mL(-1). Results revealed that, irrespective of the solution concentration, three different hydration layers surround hyaluronan. The inner layer consists of water molecules strongly retained in the proximity of the HYA surface. Because of their strong interactions with HYA, water molecules in this inner hydration layer are subject to very slow dynamics and have the largest correlation times. The other two hydration layers are made of water molecules which are located progressively further from the HYA surface.…

RelaxometryAqueous solutionMagnetic Resonance SpectroscopyField cyclingChemistrySettore AGR/13 - Chimica AgrariaDynamics (mechanics)Analytical chemistryWaterBiochemistryAnalytical ChemistryIntramolecular forceQuadrupoleMolecular motionCarbohydrate ConformationMoleculeFFC-NMR Relaxometry Correlation time Quadrupole interactions Hydration layerHyaluronic AcidAnalytical and bioanalytical chemistry
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