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: Nanocomposites from polyvinyl alcohol [PVA] in linear and crosslinked state were synthesized using varying proportions of bagasse extracted nanocellulose These were characterized by tensile, thermal, X-ray diffraction (XRD), moisture vapor transmission rate (MVTR), and morphological studies as discussed by the authors.
181 citations
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TL;DR: In this paper, a cellulose-based activated carbon cloth has been oxidized by air, nitric acid, hydrogen peroxide and iron nitrate cristallohydrate melt treatments.
181 citations
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TL;DR: In this paper, a mesoporous carbon nanotube catalyst was used to synthesize metal supported on multiwalled CNTs for continuous catalytic wet air oxidation of aniline, and the structure of the CNT supported metal catalyst was characterized by means of Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and NER.
Abstract: Multiwalled carbon nanotubes (CNTs) were functionalized with HNO3, HNO3/H2SO4, and HNO3/Na2CO3. The preparation of metal supported on mesoporous carbon nanotube catalyst is described. The catalysts were synthesized by impregnation of carbon nanotubes with different metallic precursors (H2PtCl6·6H2O, RuCl3·H2O, and CuCl2·2H2O) followed by reduction. The structures of the CNT modified with HNO3, HNO3/H2SO4, and HNO3/Na2CO3 and CNT-supported metal catalysts have been characterized by means of Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and nitrogen adsorption/desorption isotherms (BET), and their activity was tested in continuous catalytic wet air oxidation of aniline. For the catalysts prepared with metal precursors, activities were found in the order of Pt/N-CNT > Cu/N-CNT > Ru/N-CNT. The structure of carbon nanotubes supported metal catalyst is responsible for the activity, and the absence of micropores ...
181 citations
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TL;DR: Single walled carbon nanotubes are exfoliated and functionalized predominantly as individuals by grinding them for minutes at room temperature with aryldiazonium salts in the presence of ionic liquids (ILs) and K(2)CO(3).
Abstract: Single walled carbon nanotubes (SWNTs) are exfoliated and functionalized predominantly as individuals by grinding them for minutes at room temperature with aryldiazonium salts in the presence of ionic liquids (ILs) and K2CO3. This constitutes an extremely rapid and mild green chemical functionalization process for obtaining the individualized nanotube structures. A number of ILs and various reaction conditions were surveyed. Raman, XPS, UV/vis/NIR spectroscopies, thermogravimetric analysis, and atomic force and transmission electron microscopies were used to characterize the products.
180 citations
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TL;DR: In this article, a broad frequency (10−1−106 Hz) and temperature range (178−423 K) was used to probe the polymer/silica interface and two relaxation processes were identified for the composites: one corresponding to the bulklike polymer and a second one related to polymer chains close to the silica surface.
Abstract: Samples with different amounts of poly(vinyl acetate) adsorbed on silica particles were prepared in order to study their interfacial interactions and dynamics. The interface of adsorbed polymers to a substrate plays an important role in many applications such as polymer nanocomposites, thin films, and coatings. Characterization of such interfaces is thus of high importance since they were found to differ from bulk properties. Thermogravimetric analysis (TGA) is applied to analyze the amounts of polymer adsorbed on silica particles. Broadband dielectric spectroscopy (BDS) is employed in a broad frequency (10–1–106 Hz) and temperature range (178–423 K) in order to probe the polymer/silica interface. Two relaxation processes can be identified for the composites: one corresponding to the bulklike polymer and a second one related to polymer chains close to the silica surface. For the latter the dynamic glass transition is shifted to higher temperature due to reduced mobility. This effect is investigated in dep...
180 citations