Topic
Thermogravimetric analysis
About: Thermogravimetric analysis is a research topic. Over the lifetime, 37248 publications have been published within this topic receiving 862144 citations. The topic is also known as: thermal gravimetric analysis & TGA.
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TL;DR: In this article, the carbon-coated monoclinic Li 3 V 2 (PO 4 ) 3 (LVP) cathode materials were synthesized by a solid-state reaction process under the same conditions using citric acid, glucose, PVDF and starch, respectively, as both reduction agents and carbon coating sources.
184 citations
TL;DR: In this article, Nanophase Ti02 particles, with typical particle sizes in the range of 20-50 nm, have been synthesized using a microemulsion-mediated process.
Abstract: Nanophase Ti02 particles, with typical particle sizes in the range of 20-50 nm, have been synthesized using a microemulsion-mediated process. In this process, the aqueous cores ofwater/TritonX-100/exanol/ cyclohexane microemulsions have been used as constrained microreactors for the precipitation of precursor titanium hydroxide. The hydroxide particles thus formed were separated, dried, and calcined at different temperatures to form nanoparticles of TiO2. In order to see the phase transition temperature, thermogravimetric analysisldifferential thermal analysis studies were performed on the precursor hydroxide particles. The average particle size ofthese particles was determined by transmission electron microscopy, BET surface area and line broadening by X-ray diffraction. Phase transformation of these particles was confirmed by X-ray diffraction. The attenuation of ultraviolet radiation increased as the particle size decreased. As a catalyst for the photodegradation ofphenol, only the anatase form ofTiO2 showed significant degradation of phenol, whereas the rutile form of Ti02 was totally inactive for this reaction.
184 citations
TL;DR: In this paper, a facile oxidative polymerization approach using p-toluene sulfonic acid as a dopant and ammonium persulfate as an oxidant was used to construct conductive polypyrrole/SiC nanocomposites.
Abstract: Conductive polypyrrole/SiC nanocomposites are fabricated via a facile oxidative polymerization approach using p-toluene sulfonic acid as a dopant and ammonium persulfate as an oxidant. The effects of the nanoparticle loading, ratio of oxidant to monomers, and nanoparticle morphology (spheres and rods) on the physicochemical properties are investigated. Various characterization methods are carried out to determine the material properties. Thermal gravimetric analysis demonstrates an improved thermal stability of polypyrrole in the polymer nanocomposites (PNCs) with a higher decomposition temperature. The glass-transition temperature and melting temperature of the polymer and its nanocomposites are determined by differential scanning calorimetry with a decreased melting temperature of polypyrrole in the PNCs. The microstructures of pure polypyrrole and PNCs are observed by scanning electron microscopy. Powder X-ray diffraction analysis demonstrates the crytallinity of polypyrrole, and poor crystallinity is ...
184 citations
TL;DR: Differential thermal analysis (DTA), thermal gravimetric analysis (TG or TGA), and derivative Thermal Gravimetric (DTG) analysis are reported for each of the eight Source Clay minerals using commonly available commercial instruments.
Abstract: Thermal analysis involves a dynamic phenomenological approach to the study of materials by observing the response of these materials to a change in temperature. This approach differs fundamentally from static methods of analysis, such as structural or chemical analyses, which rely on direct observations of a basic property of material ( e.g. crystal structure or chemical composition) at a well-defined set of conditions ( e.g. temperature, pressure, humidity). Clay minerals are highly susceptible to significant compositional changes in response to subtle changes in conditions. For example, changes in the fugacity of water affect the stability of interlayer H2O in a clay mineral (see below). Therefore, care must be taken that all experimental conditions are known with accuracy and precision.
Differential thermal analysis (DTA), thermal gravimetric analysis (TG or TGA), and derivative thermal gravimetric (DTG) analysis are reported for each of the eight Source Clay minerals using commonly available commercial instruments. The DTA curves show the effect of energy changes (endothermic or exothermic reactions) in a sample. For clays, endothermic reactions involve desorption of surface H2O ( e.g. H2O on exterior surfaces) and dehydration ( e.g. interlayer H2O) at low temperatures (<100°C), dehydration and dehydroxylation at more elevated temperatures, and, eventually, melting. Exothermic reactions are related to recrystallization at high temperatures that may be nearly concurrent with or after dehydroxylation and melting. Discriminating between desorption and dehydration or dehydration and dehydroxylation may be problematic. The TG curves ideally show only weight changes during heating. The derivative of the TG curve, the DTG curve, shows changes in the TG slope that may not be obvious from the TG curve. Thus, the DTG curve and the DTA curve may show strong similarities for those reactions that involve weight and enthalpy changes, such as desorption, dehydration and dehydroxylation reactions.
In …
183 citations
TL;DR: In this article, two glass transitions (T g ), ∼70°C and ∼250°C, were observed for the first time using MDSC during the process of heat treatment.
183 citations