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Mechanism Study (mechanism + study)
Selected AbstractsFabrication of High-Strength Continuous Zirconia Fibers and Their Formation Mechanism StudyJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 12 2004He-Yi Liu Continuous zirconia fibers with a nanometer ceramic structure and a tensile strength up to 2.8 GPa were fabricated by pyrolyzing polyacetylacetonatozirconium precursor fibers through a special atmosphere heat treatment. DSC-TGA, GC-MS, IR, SEM, and TEM were used to study the fiber transformation mechanism during heating. Results showed that special atmosphere heat treatment could make the organics in the fibers come out directly without carbonization and remove them almost entirely under 400°C, and the obtained zirconia fibers had few defects, good continuity, and high strength. [source] Mechanism study on formation of initial condensate dropletsAICHE JOURNAL, Issue 4 2007Liu Tianqing First page of article [source] Mechanism study on carbon reducing reaction in the preparation process of strontium carbonate (SrCO3)ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 5 2009Jun Meng Abstract The mechanism for preparation of strontium carbonate (SrCO3) by the method of carbon reducing reaction is studied in this paper. Based on the mass ratio of SrSO4/C = 1.5 for this reaction, thermodynamics and kinetics calculation are conducted and also verified by TG-DSC experimental methods. For each side reaction, the changes of standard molar Gibbs function at proposed temperature are calculated through Gibbs-Helmholtz, Van't Hoff and Kirchhoff equations. TG-DSC data are used to explore the mechanism of the reaction, and to calculate the apparent activation energy and reaction orders. It has been demonstrated by TG and DSC thermal analysis for the whole reducing reaction that the apparent activation energy E is 350.6 and 307.3 kJ·mol,1, and the reaction orders n are 0.91 and 0.88, respectively. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd. [source] Facile synthesis of polyaniline hemispheres in diethyl ether/ice mixture solvent and growth mechanism studyJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 16 2010Hui-yan Ma Abstract By using the new methodology of synthesis of container structure, we demonstrate the ability to control an improved ice-templating method to synthesis of polyaniline (PANI) in the form of hemisphere. The influence of the synthetic parameters, such as the concentration of doping-acid, oxidant, and aniline on the morphologies of PANI structures, has been investigated. It is determined that the doping acid and the second solvent added (such as diethyl ether absolute) have great positive influence on the formation of product's micro-morphology. The structure and morphology of PANI hemispheres are characterized by Fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD) patterns, energy-dispersive X-ray analysis (EDX), optical microscope images, and scanning electron microscope images (SEM). The formation mechanism of hemispheres in this article is well suggested. PANI hemispheres have super performance in sensitivity, time response to NH3 compared with traditional polymerization at room temperature. This work extends the field of functional materials with complex container structure and offers a new green route to synthesis of hemispherical container structure. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 3596,3603, 2010 [source] | |||||||||||||