Papers by Keyword: FTIR Spectroscopy

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Authors: Khaidzir Hamzah, M. Abdullah Izat Yassin, M. Rahim Sahar, Sib Krishna Ghoshal, Ramli Arifin, Md Supar Rohani
Abstract: Series of glass based on (80-x)TeO2-10PbO-10PbCl2-xYb2O3 where 0.0 ≤ x ≤ 3.0 has been successfully prepared by melt quenching technique. The amorphous nature of glass has been determined by X-ray diffraction method. Their corrosion behavior was investigated using the FTIR spectroscopy technique on the sample that has been immersed in distilled water and in aqueous solution of pH 4 and pH 9 for 10 days. There were three major absorption peaks around 3600 cm-1, 889 cm-1 and 470 cm-1 has been observed. The intensity of each peak was found to vary with the Yb3+ content.
Authors: Oksana V. Livitska, Nataliya Yu. Strutynska, Igor V. Zatovsky, Nikolay S. Slobodyanik
Abstract: The interaction in the systems MII2P4O12-MICl (MINO3) (MI – Li, Na, K; MII – Mg, Co, Ni, Zn) was investigated in temperature range 1073-673 K. The conditions of formation phosphates: Li3PO4, MIMIIPO4 (MI – Na, K), Na4MII3(PO4)2P2O7, Na9Co3(PO4)5 have been established. Obtained crystalline phases have been investigated using X-ray powder diffraction, Diffuse reflectance, Raman and FTIR spectroscopy and scanning electron microscopy methods.
Authors: Martina Záleská, Milena Pavlíková, Zbyšek Pavlík
Abstract: The powder materials containing active SiO2, which are used as pozzolanic active materials in cement mixtures, can be classified in consideration of their pozzolana activity, particle size or reactivity. In this paper, several types of metakaoline are studied using Frattini and modified Chapelle test for pozzolanic activity determination. The particle size analysis is measured using the laser diffraction analyser and the differences in the chemical composition are characterized by FTIR spectroscopy. The obtained data show influence of particle size and chemical composition of tested powders on their pozzolanic activity, which corresponds with the results of Frattini and modified Chapelle test.
Authors: A. Gerhardt, J. Donecker, B. Selle, Jürgen Wollweber
Authors: Rui A. Silva, P.A. Silva, M.E. Carvalho
Abstract: Degradation studies of PP and PVDF monofilaments were carried out using a special chamber for several periods of time. One set of the samples was exposed to a 0.9 % NaCl solution and to ultraviolet radiation at 830 C and the other set involved the exposition in air under the same conditions of irradiation and temperature. Scanning Electron Microscopy (SEM) analysis showed direct evidence of PP degradation. Meanwhile, the PVDF monofilaments showed no apparent evidence of degradation under the same conditions. Differential Thermal Analysis (DTA) curves, FTIR spectra and Oxidation Induction Time experiments confirmed the results of SEM Analysis.
Authors: Ameni Gharzouni, Emmanuel Joussein, Samir Baklouti, Sylvie Rossignol
Abstract: The choice of precursors is a key parameter in the geopolymerization mechanism since it governs the kinetic of the reaction as well as the working properties of the final materials. This study focuses on the effect of the alkaline solution reactivity and metakaolin properties on the geopolymer formation. For this purpose, several geopolymer samples were synthesized from two alkaline solutions and three metakaolins. The structural evolution of formed geopolymers was investigated using FTIR spectroscopy and the following of the pH value during the formation. The measurement of mechanical strength was tested by compression. The results allow to evidence that for a less reactive alkaline solution, the reactivity of metakaolin governs the geopolymerization reaction. However, the alkaline solution is the steering reaction when it is highly reactive. Therefore, the extent of depolymerization of the alkaline solution and the reactivity of the metakaolin seem to control the rate of polycondensation and the mechanical properties of the geopolymer materials.
Authors: P. Sathiyanathan, Dhevagoti Manjula Dhevi, Arun Anand Prabu, Kap Jin Kim
Abstract: Thin films of polyvinylidene (PVDF) and its copolymers containing 50 to 30 mole % of trifluoroethylene (TrFE) demonstrate rapid reversal of polarization under applied electric field, and can be used as ferroelectric materials in non-volatile memory devices. In this study, Fourier-transform infrared transmission (FTIR-TS) and grazing incident reflection absorption (FTIR-GIRAS) spectroscopy techniques were used to examine the changes in Curie transition temperature (Tc), chain and dipole orientation in selected VDF copolymer spun-cast films as a subjected to a reversible thermal-cycling treatment. A reversible solid-to-solid β-crystalline phase transition with thermal hysteresis and a favorable C-F dipole orientation along the electric field direction were observed for the sample subjected to thermal-cycling below its melting point (Tm). An irreversible β-crystalline phase transition with unfavorable C-F dipole orientation was observed for the sample treated to heating-cooling cycle above Tm. The results are reported in detail here.
Authors: Masturi, Sunarno
Abstract: Van der Waals (vdW) interaction is one of the important properties in the composite. The usual measurement used to investigate the vdW interaction between filler and polymeric binder is FTIR spectroscopy where the result obtained is the band shift appearance, however, it has not been used yet to estimate the vdW magnitude. Using the Lennard-Jones potential, we developed a new analysis method to obtain approximately its magnitude and further the distance between filler atoms and polymeric group. We used our model proposed to several data reported by some authors, and interestingly we also found an appearance of anharmonic vibration of the atoms.
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