Search results for " kaolinite"

showing 6 items of 6 documents

Effect of climate and vegetation on soil organic carbon, humus fractions, allophanes, imogolite, kaolinite, and oxyhydroxides in volcanic soils of Et…

2007

A soil sequence along an elevational gradient ranging from subtropical to subalpine climate zones in the Etna region (Sicily, southern Italy) was investigated with respect to organic C, kaolinite, and crystalline to noncrystalline Al and Fe phases. Special emphasis was given to the stabilization of soil organic carbon (SOC) and its interaction with the inorganic phases. The soils were variations of Vitric Andosols that developed on a trachy-basaltic lava flow with an age of 15,000 years. Two main vegetation systems dominated the sites: at the lower sites, it was mainly maquis vegetation and, at the higher elevated sites, predominantly coniferous forest. The concentration of SOC in the topso…

chemistry.chemical_classificationTopsoilSoil organic matterSoil ScienceSoil scienceSoil carbonHumusAndosolSoil organic matter kaolinite fulvic and humid acidschemistrySoil waterVegetation typeOrganic matterGeology
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Effect of Morphology and Size of Halloysite Nanotubes on Functional Pectin Bionanocomposites for Food Packaging Applications

2017

Pectin bionanocomposite films filled with various concentrations of two different types of halloysite nanotubes were prepared and characterized in this study as potential films for food packaging applications. The two types of halloysite nanotubes were long and thin (patch) (200-30 000 nm length) and short and stubby (Matauri Bay) (50-3000 nm length) with different morphological, physical, and dispersibility properties. Both matrix (pectin) and reinforcer (halloysite nanotubes) used in this study are considered as biocompatible, natural, and low-cost materials. Various characterization tests including Fourier transform infrared spectroscopy, field emission scanning electron microscopy, rele…

PectinScanning electron microscopeHalloysite nanotube02 engineering and technology01 natural sciencesPackaging machineContact angleBionanocompositeHeat resistanceGeneral Materials ScienceComposite materialSettore CHIM/02 - Chimica FisicapectinNanotubesYarn Antimicrobial filmFourier transform infrared spectroscopypatch halloysiteSalicylic acidDynamic mechanical analysis021001 nanoscience & nanotechnologyReinforcementPackagingPolyethylenepectin Kaoliniteantimicrobial filmPectinsAluminum SilicatesBiocompatibility0210 nano-technologyScanning electron microscopyMicroorganismMaterials sciencefood.ingredientBiocompatibilityengineering.materialDynamic mechanical analysi010402 general chemistryHalloysiteFood packagingfoodUltimate tensile strengthFourier transform infrared spectroscopyContact angleBacteriaField emission microscopeFunctional foodthermal resistanceHalloysite0104 chemical sciencesNanotubeBiological materialengineeringClayACS Applied Materials & Interfaces
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Bader's topologycal analysis of teh electron density and the laplacian in kaolinite and dikite.

2009

Bader's topologycal analysis laplacia kaolinite
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Halloysite Nanotubes Loaded with Calcium Hydroxide: Alkaline Fillers for the Deacidification of Waterlogged Archeological Woods

2018

A novel green protocol for the deacidifying consolidation of waterlogged archaeological woods through aqueous dispersions of polyethylene glycol (PEG) 1500 and halloysite nanotubes containing calcium hydroxide has been designed. First, we prepared functionalized halloysite nanotubes filled with Ca(OH)2 in their lumen. The controlled and sustained release of Ca(OH)2 from the halloysite lumen extended its neutralization action over time, allowing the development of a long-term deacidification of the wood samples. A preliminary thermomechanical characterization of clay/polymer nanocomposites allows us to determine the experimental conditions to maximize the consolidation efficiency of the wood…

Archaeological woodTubular nanostructures KaoliniteMaterials sciencePolymer nanocompositelong-term protectionComposite numberHalloysite nanotubeAlkalinityWood productLong-term preservationMechanical performancedeacidificationLime02 engineering and technologyPolyethylene glycolengineering.material010402 general chemistrycomplex mixtures01 natural sciencesHalloysitechemistry.chemical_compoundPEG ratioLigninGeneral Materials SciencehalloysiteFillerYarn Aqueous dispersionwaterlogged archaeological woodschemistry.chemical_classificationCalcium hydroxideNanocompositeHydrated limetechnology industry and agriculturePolymerThermo-mechanical characterization021001 nanoscience & nanotechnologyArchaeologyPEG0104 chemical sciencesNanotubechemistryengineeringExperimental condition0210 nano-technology
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Origin of clay minerals in soils on pyroclastic deposits in the island of Lipari (Italy)

2005

The island of Lipari (Italy) is characterized by calc-alkaline to potassic volcanism and a Mediterranean-type climate. The mineralogical and chemical features of two different soil profiles with ages of 92,000 and 10,000–40,000 y, respectively, have been investigated. There were no Andisols, but Vitric and Vertic Cambisols have developed at both sites. Although the morphology of the soils was similar, remarkable differences in the clay mineralogy between the two sites were observed. The site with the Vitric Cambisol was associated with the weathering sequence: glass → halloysite → kaolinite or interstratified kaolinite-2:1 clay minerals. Both sites had smectite in the clay fraction and, to …

CambisolGeochemistrySoil ScienceMineralogyWeatheringAndisols geochemistry montmorillonite glasses kaolinite sheet silicates Italy Cambisols clay mineralogy Europe silicates soils halloysite Lipari Islands clay minerals igneous rocks Lipari Island smectite metasomatism weathering Sicily Italy volcanic rocks Southern Europeengineering.materialHalloysitechemistry.chemical_compoundMontmorillonitechemistrySettore AGR/14 - PedologiaGeochemistry and PetrologySoil waterEarth and Planetary Sciences (miscellaneous)engineeringSoil horizonKaoliniteClay mineralsGeologyWater Science and Technologyclays and clay minerals
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An assembly of organic-inorganic composites using halloysite clay nanotubes

2018

Halloysite is natural tubular clay suitable as a component of biocompatible nanosystems with specific functionalities. The selective modification of halloysite inner/outer surfaces can be achieved by exploiting supramolecular and covalent interactions resulting in controlled colloidal stability adjusted to the solvent polarity. The functionalized halloysite nanotubes can be employed as reinforcing filler for polymers as well as carriers for the sustained release of active molecules, such as antioxidants, flame-retardants, corrosion inhibitors, biocides and drugs. The tubular morphology makes halloysite a perspective template for core-shell metal supports for mesoporous catalysts. The cataly…

Polymers and PlasticsHalloysite nanotube02 engineering and technologyReview01 natural sciencesunclassified drug adsorptionFlame retardantcovalent bondColloid and Surface ChemistryhalloysiteControlled drug deliverychemistry.chemical_classificationemulsionquantum dotSurfaces and InterfacesPolymerSelf assembly021001 nanoscience & nanotechnologynanorodPickering emulsionCorrosion inhibitoroil spillSolventSelective modification Kaolinite chemicals and drugNanorodBiocompatibility0210 nano-technologyOil water interfaceYarn Covalent interactionNanotubeMaterials scienceSupramolecular chemistrysustained drug releasecatalysiengineering.material010402 general chemistryHalloysitebioremediationPhysical and Theoretical ChemistryhydrophobicityMesoporous catalystpetroleummetal nanoparticlePhase interfacemetal bindingReinforcing fillerPickering emulsion0104 chemical sciencesOrganic-inorganic compositeNanotubeFilled polymerchemistryChemical engineeringengineeringSelf-assemblyCatalystMesoporous material
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