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 synthesis and characterization of 25−70 amine-capped gold nanocrystals were reported, showing that the stability of the particles appears to be largely kinetic, rather than thermodynamic, in nature.
Abstract: We report on the synthesis and characterization of 25−70 A diameter amine-capped gold nanocrystals. In particular, we show how these particles can be prepared by a simple procedure and confirm the particle composition (including the identity of the amine surface passivant) through several materials characterization techniques that include infrared spectroscopy, nuclear magnetic resonance spectroscopy, ultraviolet−visible spectroscopy, mass spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, X-ray diffraction analysis, differential scanning calorimetry, thermogravimetric analysis, and elemental analysis. All physical characterizations are consistent with a charge−neutral amine/gold surface interaction described by a weak covalent bond. The stability of the particles appears to be largely kinetic, rather than thermodynamic, in nature. Comparison of these nanocrystals to amines adsorbed onto bulk Au surfaces indicates that the stability of the nanocrystal/amine system is a finite-size effect.
923 citations
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TL;DR: The mesoporous molecular sieves MCM-41 were synthesized and characterized by X-ray powder diffraction, nitrogen adsorption/desorption, cyclohexane and water adaption, transmission electron micrographs (TEM), thermogravimetric analysis (TGA), ammonia temperature-programmed desorption (TPD), FTIR, FT-Raman, 29Si, 27Al and 13C magic angle spinning (MAS) NMR spectroscopy.
878 citations
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TL;DR: In this paper, the effects of preparation conditions on the thermal and morphological behavior of the nanocrystals were investigated and a possible correlation between preparation conditions and particle size was not observed.
860 citations
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TL;DR: In this paper, Oleic acid (OA)-coated magnetite nanoparticles of 7 and 19 µm were obtained by the seed-mediated high temperature thermal decomposition of iron(III) acetylacetonate (Fe(acac) 3 ) precursor method.
859 citations
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TL;DR: The most active catalysts were formed when Fe was added to the support before the pyrolysis; however, samples in which Ni or no metal was added still showed increased activity for oxygen reduction compared with untreated carbon as mentioned in this paper.
849 citations