Search results for " TGA"

showing 10 items of 14 documents

Systematic Synthesis and Properties Evaluation of Dicationic Ionic Liquids, and a Glance Into a Potential New Field

2018

Dicationic ionic liquids (DILs), a subset of the ionic liquid (IL) family, have attracted growing interest in recent years, and the range of applications within which they are investigated is constantly expanding. However, data which allows structure to property correlation of a DIL is still limited, and thus selecting an appropriate salt to address a specific challenge can be problematic. In comparison to traditional ILs, DILs physico-chemical properties can be tuned by changing the length and type of spacer which connects the cationic heads as well as the type of cation. This in turn could give rise to symmetrical or asymmetrical DILs. In this work, a systematic study of a homogeneous cla…

Materials scienceField (physics)Salt (chemistry)02 engineering and technology010402 general chemistry01 natural sciencesDSClcsh:Chemistrychemistry.chemical_compounddicationic ionic liquids thermal analyses deep eutectic solvents TGA DSCComputational chemistryThermal stabilityCarboxylateOriginal ResearchEutectic systemdeep eutectic solventschemistry.chemical_classificationTGAthermal analysesHydrogen bondCationic polymerizationGeneral Chemistry021001 nanoscience & nanotechnology0104 chemical sciencesdicationic ionic liquidsChemistrychemistrylcsh:QD1-999Ionic liquid0210 nano-technology
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Olive mill wastewaters decontamination based on organo-nano-clay composites

2019

Abstract Green composites for environmental applications were successfully prepared by intercalation of the biosurfactant Quillaja saponin onto montmorillonite mineral clay on varying pH and surfactant/clay ratio. Equilibrium adsorption isotherms were constructed and the system was characterized by performing TGA and XRD analyses. The efficiency of the surfactant-modified clay in the removal of the organic content present in olive mill wastewaters (OMW) was evaluated by means of spectrophotometric measurements. The interest for this cogent issue comes from the consideration that, despite their high pollutant content, OMW can be considered as a potential resource of several organic compounds…

PolyphenolMaterials Chemistry2506 Metals and AlloysMaterials scienceHill isothermXRDIntercalation (chemistry)Surfaces Coatings and FilmQuillaja saponinCeramics and Composite02 engineering and technology01 natural sciencesCoatings and Filmschemistry.chemical_compoundAdsorptionPulmonary surfactant0103 physical sciencesMaterials ChemistryElectronicOrganoclayOptical and Magnetic MaterialsComposite materialMontmorillonite010302 applied physicsOlive mill wastewaterAdsorption; Biowaste; Hill isotherm; Montmorillonite; Olive mill wastewaters; Polyphenols; Quillaja saponin; TGA; XRD; Electronic Optical and Magnetic Materials; Ceramics and Composites; Process Chemistry and Technology; Surfaces Coatings and Films; Materials Chemistry2506 Metals and AlloysTGAbiologyElectronic Optical and Magnetic MaterialProcess Chemistry and TechnologyPolyphenolsHuman decontaminationBiowaste021001 nanoscience & nanotechnologybiology.organism_classificationSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsSurfacesSubstrate (building)MontmorillonitechemistryQuillajaCeramics and CompositesOlive mill wastewatersAdsorption0210 nano-technology
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Solution and thermal behaviour of novel dicationic imidazolium ionic liquids

2013

A new class of functionalised dicationic ionic liquids, containing a central cationic unit capped by a basic functionality (imidazole), has been synthesised. These salts have been characterised in isotropic solution using proton and 2D-NMR spectroscopy, and their thermal stability has been studied by DSC and TGA. All these novel salts contain the 1-(1-imidazolylmethyl)-3,5-di{1-(3'-octylimidazolylmethyl)}-benzene cation as a defining structural motif. Salts of both singly and doubly charged anions were prepared and, in particular, the selected monoanions (Br(-), [BF4](-), or [NTf2](-)) differ in size, shape and hydrogen-bonding ability, whereas the dianions differ in the nature of the space…

ProtonOrganic ChemistryInorganic chemistryCationic polymerizationSettore CHIM/06 - Chimica OrganicaBiochemistryionic liquids NMR TGA DSCIonchemistry.chemical_compoundCrystallographychemistryIonic liquidImidazoleThermal stabilityPhysical and Theoretical ChemistrySpectroscopyConformational isomerism
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NMR Spectroscopic characterization and thermal behaviour of a new class of dicationic imidazolium ionic liquids

Settore CHIM/06 - Chimica Organicaionic liquids NMR TGA DSC
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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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Thermogravimetric analysis. A tool to evaluate the ability of mixtures in consolidating waterlogged archaeological woods

2010

Waterlogged archaeological woods (Pinus pinaster, Ulmus cf. minor and Fagus sylvatica L.) were consolidated by using Colophony, Rosin 100, and a mixture of Poly(ethylene) glycol (PEG) 3000 and Poly(propylene) glycol (PPG) 425. The efficiency of the consolidants was estimated by determining the content entrapped into the cavity of degraded wood. For this purpose, thermogravimetry was demonstrated to be a reliable tool. In the case that the polymeric mixture was used for impregnation, it was also possible to discriminate the amount of PEG 3000 from that of PPG 425 captured by the wood capillaries. Regardless of the wood nature, all the consolidants were present in treated samples in large amo…

Thermogravimetric analysisEthyleneMaterials scienceAbsorption of waterbiologyRosinCondensed Matter Physicsbiology.organism_classificationArchaeologywood TGA polymerThermogravimetrychemistry.chemical_compoundFagus sylvaticachemistryPEG ratiomedicinePhysical and Theoretical ChemistryThermal analysismedicine.drug
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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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Structural Characterisation of Complex Layered Double Hydroxides and TGA-GC-MS Study on Thermal Response and Carbonate Contamination in Nitrate- and …

2015

Layered double hydroxides (LDHs) are versatile materials used for intercalating bioactive molecules in the fields of pharmaceuticals, nutraceuticals and cosmetics, with the purpose of protecting them from degradation, enhancing their water solubility to increase bioavailability and improving their pharmacokinetic properties and formulation stability. Moreover, LDHs are used in various technological applications to improve stability and processability. The crystal chemistry of hydrotalcite-like compounds was investigated by X-ray powder diffraction (XRPD), automated electron diffraction tomography (ADT) and thermogravimetric analysis (TGA)-GC-MS to shed light on the mechanisms involved in io…

Thermogravimetric analysishydrotalcytethermal responseInorganic chemistryIntercalation (chemistry)intercationsion exchangeengineering.materialCatalysischemistry.chemical_compoundCrystallinityAdsorptionlayered compoundsOrganic chemistryTGAHydrotalciteIon exchangeChemistryOrganic Chemistryelectron diffraction; intercations; ion exchange; layered compounds; structure elucidationstructure elucidationLayered double hydroxidesstructural characterization hydrotalcyte TGA GC-MS thermal response X-ray powderGeneral ChemistryX-ray powderstructural characterizationengineeringCarbonateelectron diffractionGC-MS
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Kriptovalūtu volatilitātes modelēšana un prognozēšana

2018

Maģistra darbā ir veikta GARCH volatilitātes modelēšana četrām, pēc tirgus kapitalizācijas, lielākajām kriptovalūtām: Bitcoin, Ethereum, Litecoin un Ripple. Darba empīriskajā daļā, tiek veikta kriptovalūtu GARCH, TGARCH, EGARCH un PGARCH modelēšana un prognozēšana izmantojot normālo un stjūdenta t sadalījumus, aplūkojot laika periodu no 07.08.2015 līdz 27.03.2018. Labākais modelis tiek noteikts salīdzinot trīs modeļu informācijas kritērijus un modeļu prognozes novērtējumus. Kaut arī stjūdenta t sadalījuma izmantošana uzlaboja modeļu novērtējumu visām četrām kriptovalūtām, tomēr tas ne vienmēr uzlaboja modeļa prognozi. Pēc iegūtajiem rezultātiem var secināt Ripple un Bitcoin EGARCH modeļi pā…

Volatilitātes modelēšana un prognozēšanaKriptovalūtaBitcoin Litecoin Ethereum RippleGARCH TGARCH EGARCH PGARCHEkonomika
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Effects of pyrolysis conditions on the thermal transformation of chicken manure into char

2012

Biochar is a fine-grained and highly porous carbonaceous substance, arising from the pyrolitic decomposition of natural or synthetic organic materials. It is lately applied to soils to favorably affect soil physico-chemical properties, such as water and nutrient retention and cation exchange capacity (CEC). The extent of the effect of biochar on crop productivity is very variable due to the different biophysical interactions and processes that occur when it is applied to soils. Char properties are greatly influenced by both natures of feedstock and process conditions. An accurate characterization of biochar is crucial to evaluate the possibility to amend soil with such material by avoiding …

biochar Relaxometry NMR T2 DSC TGA
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