Search results for "Thermal Analysis"

showing 10 items of 208 documents

Analysis of archaeological samples and local clays using ICP-AES, TG–DTG and FTIR techniques

2000

Abstract The spectrochemical and thermal analysis of different archaeological samples as bricks, terra-cotta and local clays were carried out. The concentration of major and minor elements of samples was determined by sequential inductively coupled plasma atomic emission spectrometry. The method was tested by determining Si, Al, Fe, Ca, Mg, Mn, Pb, Cu, Zn, Ti, Na and K in the standard solutions and reference material GXR-4. The precision of the determination (relative standard deviation) ranged from 0.4 to 1.54%. The clay minerals are the main materials for the production of bricks and terra-cotta figures. Thermogravimetric (TG) and differential (TG–DTG) analysis and Fourier transform infra…

Thermogravimetric analysisEvolved gas analysisChemistryInductively coupled plasma atomic emission spectroscopyAnalytical chemistryFourier transform infrared spectroscopyStandard solutionInductively coupled plasmaClay mineralsThermal analysisArchaeologyAnalytical ChemistryTalanta
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Thermo-oxidative ageing of an organo-modified clay and effects on the properties of PA6 based nanocomposites

2013

a b s t r a c t In this work a careful investigation on the degradation of an organically modified montmorillonite sample (Cloisite 15A) thermal treated under different atmospheres, namely nitrogen, air and oxygen enriched atmosphere was performed. The exposure time of the thermal treatment ranged between 5 and 300 min. The chemical composition evolution as function of the thermal treatment conditions of the clay organic modifier was monitored by means of combined thermogravimetry/Fourier transform infrared spectroscopy (TGA-FTIR). Moreover, the morphological behaviour of treated Cloisite 15A sam- ples as function of the time and of the decomposition atmosphere was investigated by X-ray dif…

Thermogravimetric analysisMaterials scienceNanocompositeMontmorillonite Organic modifier Degradation Nanocomposites TGA–FTIRThermal treatmentCondensed Matter PhysicsThermogravimetrychemistry.chemical_compoundMontmorillonitechemistryLimiting oxygen concentrationPhysical and Theoretical ChemistryFourier transform infrared spectroscopyComposite materialThermal analysisInstrumentation
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Radiation curing of diacrylate glycerolate of bisphenol-A in the presence of an organically modified montmorillonite for the production of flame-resi…

2006

Polymerization of an acrylate derivative of bisphenol-A by ionizing radiation in the presence of an organically modified montmorillonite was carried out in order to produce a flame-retardant composite. The measurement of the thermal effect during irradiation indicates that radiation curing of pure resin and resin-clay mixtures occurred in both cases. Moreover, differential scanning calorimetry and dynamic mechanical thermal analysis showed that a curing completion can be obtained by thermal curing after irradiation with a significant increase of the glass transition temperature. The morphology was investigated by X-ray diffraction and transmission electron microscopy. These have indicated t…

Thermogravimetric analysisMaterials sciencePolymers and PlasticsGeneral Chemical EngineeringFlame retardance Organoclay Polymer composites Radiation Radical polymerizationOrganic Chemistryengineering.materialPolymer claychemistry.chemical_compoundDifferential scanning calorimetryMontmorillonitechemistryCone calorimeterengineeringComposite materialThermal analysisGlass transitionCuring (chemistry)Advances in Polymer Technology
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A new eco-friendly chemical treatment of natural fibres: Effect of sodium bicarbonate on properties of sisal fibre and its epoxy composites

2016

Abstract Several researchers have shown how sisal fibres possess remarkable tensile properties that yield them good candidates as reinforcement in biocomposite materials. This work aims to evaluate the effect of an eco-friendly and cost effective surface treatment method based on the use of commercial sodium bicarbonate (i.e. baking soda) on properties of sisal fibre and its epoxy composites. In particular, raw sisal fibres were treated with a 10%w/w of sodium bicarbonate solution for different periods (24, 120 and 240 h), at room temperature. Changes occurring in sisal fibres were characterized through scanning electron microscope, Fourier transform infrared spectroscopy, thermogravimetric…

Thermogravimetric analysisMaterials scienceScanning electron microscopeB. Mechanical propertie02 engineering and technology010402 general chemistry01 natural sciencesIndustrial and Manufacturing EngineeringFibreFlexural strengthUltimate tensile strengthThermal analysisComposite materialFourier transform infrared spectroscopySISALcomputer.programming_languageStatistical properties/methodMechanical EngineeringEpoxyChemical treatment021001 nanoscience & nanotechnology0104 chemical sciencesSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiMechanics of Materialsvisual_artCeramics and Compositesvisual_art.visual_art_mediumBiocomposite0210 nano-technologycomputerA. Fibres; B. Mechanical properties; C. Statistical properties/methods; Chemical treatment; D. Thermal analysis; Ceramics and Composites; Mechanics of Materials; Mechanical Engineering; Industrial and Manufacturing Engineering
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Synthesis and characterization of α-hopeite, Zn3(PO4)2·4H2O

1999

Orthorhombic α-Zn3(PO4)2·4H2O, α-hopeite, was synthesized from an aqueous solution of zinc acetate and orthophosphoric acid. The synthesis from these starting materials yielded best results with respect to purity and crystallinity. Structural characteristics of the compound were investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and thermogravimetric/differential thermal analysis (TG/DTA). Supplemental data came from surface area, particle size distribution, and density measurements. The obtained compound proved to be highly crystalline and stoichiometric. Dehydration of α-hopeite is accompanied by at least two endothermic effect…

Thermogravimetric analysisScanning electron microscopeMechanical EngineeringInorganic chemistryAnalytical chemistryZinc phosphatechemistry.chemical_elementInfrared spectroscopyZincCondensed Matter Physicschemistry.chemical_compoundCrystallinitychemistryMechanics of MaterialsDifferential thermal analysisGeneral Materials ScienceOrthorhombic crystal systemMaterials Research Bulletin
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Effect of some additives on the reactions in fly ASH-Ca(OH)2system

2004

Differential thermal analysis and thermogravimetry were used to evaluate the effect of some additives, such as CaSO4, CaCl2 and silica fume amorphous silica from ferrosilicon synthesis on the mechanism and kinetics of reactions occurring in fly ash-Ca(OH)2 system. The accelerating role of these additives was demonstrated from the data relating to Ca(OH)2 consumption in hydrated pastes, determined by TG measurements.

ThermogravimetryFerrosiliconMaterials scienceSilica fumeChemical engineeringFly ashDifferential thermal analysisKineticsPozzolanic reactionPhysical and Theoretical ChemistryComposite materialCondensed Matter PhysicsThermal analysisJournal of Thermal Analysis and Calorimetry
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Influence of sample pan on the thermal behaviour of KSCN measured with TG

2003

Abstract In this study, the influence of the sample pan on the thermal behaviour of potassium thiocyanate (KSCN) was investigated. The measurements were performed with thermogravimetry (TG) and the two sample pans used were a platinum pan and a ceramic crucible. The samples were heated to 400–950 °C and the thermal products were identified by powder diffraction. The thermal behaviour of KSCN was found to be dependent on the sample pan used. With the platinum sample pan KSCN reacted in the first step into a mixture of K 2 SO 4 and potassium tetracyanoplatinate (K 2 Pt(CN) 4 ). In the second step, the mixture reacted further to pure K 2 SO 4 . In the ceramic sample crucible, however, the reac…

ThiocyanateAnalytical chemistrychemistry.chemical_elementCondensed Matter PhysicsAlkali metalRubidiumThermogravimetrychemistry.chemical_compoundchemistryPotassium thiocyanateSample preparationPhysical and Theoretical ChemistryPlatinumThermal analysisInstrumentationThermochimica Acta
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Preparation, thermal analysis and photoactivity of TiO2 samples

2012

TiO2 photocatalysis Thermal analysisSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie
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Thermal Evolution of Titania Nanostructured Powders Obtained from Reverse Micelle Method

2012

Titania Nanoparticles thermal analysis
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Interlaminar fracture toughness behavior of electron-beam cured carbon-fiber reinforced epoxy-resin composites

2013

The work describes the preparation and physical-mechanical characterization of unidirectional CFRP panels manufactured by an electron beam curing technique. Delamination fracture toughness in Mode I and II is investigated in order to evaluate the influence of fiber–matrix adhesion strength, matrix toughness and matrix crosslinking density as determined by the radiation curing process. A matrix system comprising a DGEBA epoxy monomer and an initiator of cationic polymerization have been used, with one batch of resin mixed with a PES monomer in order to enhance matrix toughness. Curing was achieved with a pulsed 10 MeV Electron Beam accelerator. Thermally cured composite systems have also bee…

ToughnessMaterials sciencePolymers and PlasticsDelaminationComposite numberCationic polymerizationGeneral ChemistryEpoxyInterlaminar Fracture Toughness Electron-Beam Curing Carbon-Fiber Reinforced Plastic CompositesSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineFracture toughnessvisual_artMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumSettore CHIM/07 - Fondamenti Chimici Delle TecnologieComposite materialThermal analysisCuring (chemistry)Polymer Composites
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