This paper reports the synthesis of technologically important ferrites such as ZnFe 2 O 4 , NiFe 2 O 4 , MnFe 2 O 4 , and CoFe 2 O 4 by using novel microwave-hydrothermal processing. Nanophase ferrites with high surface areas, in the range of 72-247m 2 /g, have been synthesized in a matter of a few minutes at temperatures as low as 164°C. The rapid synthesis of nanophase ferrites via an acceleration of reaction rates under microwave-hydrothermal conditions is expected to lead to energy savings.
This paper reports results that show the effect of microwave absorption on the bulk crystallization of two glasses in the CaO-ZrO 2 -SiO 2 system. The glass samples were devitrified using either microwave or conventional heating, to compare the results obtained from the two different techniques. Remarkably different crystallization paths were observed, depending mostly on the composition of the glass. This observation was especially true when microwave heating was used, where the dielectric losses observed in silicate glasses are related to the ZrO 2 content. X-ray diffraction analysis was performed on the powdered samples, to determine the crystalline phases present. The microstructure and microanalysis results of these glass-ceramic compositions are presented and are related to the different ZrO 2 contents.
In the present work thermal and chemical properties of a glass-ceramic frit containing zirconium oxide are evaluated after milling in various polar and nonpolar solvents. Particlesize distribution is one of the main variables investigated to evaluate the efficiency of several solvents. Milling in various solvents does not affect the thermal properties of the glass while the presence of polar groups in the solvent molecule increases the cation release from the glass. Fig. 2. Particle-size distribution expressed as D 10 , D 50 , D 90 for the frit powders ground in the various solvents.
Thermosetting is an important part of the finishing of thermoplastic poly(ethylene terephthalate) (PET) fabrics and garments that confers stability in dimensions and shape as well as appropriate hand to the final product. Conventional thermosetting methods for PET include hot air and steaming treatments.
In the present work we used solid state NMR as well as DSC methods in order to investigate any differences in the behaviour of PET chips when annealed with either a conventional or a microwave technique.
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