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Sutapun M.,King Mongkuts University of Technology Thonburi | Sutapun M.,Thep Center | Boonchom B.,King Mongkuts University of Technology Thonburi | Vittayakorn N.,King Mongkuts University of Technology Thonburi | And 2 more authors.
Advanced Materials Research | Year: 2012

Zn 3(PO 4) 2.4H 2O, which is an important component of biomedical zinc phosphate cement, was synthesized from an aqueous solution of zinc oxide and orthophosphoric acid by the sonochemical method. This synthesis method yielded best results with respect to high purity and crystallinity. Structural characteristics of the compound were investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and scanning electron microscopy (SEM). FT-IR spectra indicated the presences of different crystallographic PO 4 3- ion and H 2O molecules for the Zn 3(PO 4) 2.4H 2O and Zn 3(PO 4) 2 structures. The resulting XRD patterns showed the purity phases of orthorhombic Zn 3(PO 4) 2.4H 2O and the monoclinic for its final decomposed Zn 3(PO 4) 2 product. The thermal stability, crystallite size, and plate-like microparticles of Zn 3(PO 4) 2.4H 2O and Zn 3(PO 4) 2 are different in this work from those in previous reports, which may be caused by the starting reagents and reaction condition for the sonochemical method. © (2012) Trans Tech Publications. Source


Boonchom B.,King Mongkuts University of Technology Thonburi | Boonchom B.,Advanced Materials Science Research Unit | Vittayakorn N.,Advanced Materials Science Research Unit | Vittayakorn N.,King Mongkuts University of Technology Thonburi
Powder Technology | Year: 2010

Floral-like microparticle of a binary cobalt iron cyclotetraphosphate CoFeP4O12 was synthesized through solid phase reaction using cobalt carbonate, iron metal and phosphoric acid with further calcinations at the temperature of 500 °C. The XRD and FTIR results indicate that the prepared CoFeP4O12 has a pure monoclinic phase without the presence of any phase impurities. The floral-like microparticle and superparamagnetic behavior of the synthesized CoFeP4O12 are important properties for specific applications, which were revealed by SEM and VSM techniques, respectively. The dominant features of the synthesized CoFeP4O12 in this work are compared with M2P4O12 (M = Co and Fe) and CoFeP4O12 reported in our previous works. © 2009 Elsevier B.V. All rights reserved. Source


Boonchom B.,King Mongkuts University of Technology Thonburi | Boonchom B.,Advanced Materials Science Research Unit | Vittayakorn N.,Advanced Materials Science Research Unit | Vittayakorn N.,King Mongkuts University of Technology Thonburi
Materials Letters | Year: 2010

The pyrophosphate of CuFeP2O7 was synthesized through one step-thermal synthesis at 500 °C using the mixing of copper carbonate, iron metals and phosphoric acid. FTIR and XRD results indicate the dominant feature of pyrophosphate (P2O7 4-) anion and a pure monoclinic phase with space group C2h 6 (Z = 4), respectively. The crystallite size of 25 ± 9 nm for the CuFeP2O7 was estimated by X-ray line broadening. Room temperature magnetization result shows ferromagnetic behavior of the CuFeP2O7 powder, having hysteresis loop in the range of ± 10,000 Oe with the specific magnetization value of 1.57 emu g- 1. This property is important for specific application and is presented for the first time. © 2009 Elsevier B.V. All rights reserved. Source


Baitahe R.,King Mongkuts University of Technology Thonburi | Baitahe R.,center | Vittayakorn N.,King Mongkuts University of Technology Thonburi | Vittayakorn N.,center | And 2 more authors.
Journal of Thermal Analysis and Calorimetry | Year: 2012

Copper hydrogenphosphate monohydrate, Cu- HPO4.H2O, was synthesized for the first time through simple and rapid method using the mixing of copper carbonate and phosphoric acid in acetone medium at ambient temperature. The obtained CuHPO4.H2O decomposed in three stages via dehydration and deprotonated hydrogenphosphate reactions, revealed by TG/DTG and DSC techniques. The kinetic triplet parameters (Ea, A, and n) and thermodynamic functions (δHz.ast;, δGz.ast;, and δS*) for the first two decomposed steps were calculated from DSC data. All the obtained functions indicate that the deprotonated HPO4 2- reaction for the second step occurs at a higher energy pathway than the dehydration reaction for the first step. The calculated wavenumbers based on DSC peaks were comparable with FTIR results, which support the breaking bonds of OH (H2O) and P-OH (HPO4 2-) according to decomposed mechanisms. All the calculated results are consistent and in good agreement with Cu- HPO4.H2O's thermal transformation mechanisms. © Akademiai Kiado, Budapest, Hungary 2012. Source


Wongpisutpaisan N.,King Mongkuts University of Technology Thonburi | Charoonsuk P.,King Mongkuts University of Technology Thonburi | Vittayakorn N.,King Mongkuts University of Technology Thonburi | Vittayakorn N.,Advanced Materials Science Research Unit | Pecharapa W.,King Mongkuts University of Technology Thonburi
Energy Procedia | Year: 2011

Copper oxide (CuO) nanoparticles were synthesized by a sonochemical process using copper nitrate and sodium hydroxide in the presence of polyvinyl alcohol (PVA) as a starting precursor. The precipitated product was calcined at various temperature ranging from 400-700°C. The physical microstructure and morphology of as-calcined nanoparticles were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). From XRD observation, it is evident that the high purity CuO nanoparticles were obtained by this synthesis process. It was additionally revealed that its crystallization and particle size was strongly dependent on the reaction time and calcination temperature. © 2011 Published by Elsevier Ltd. Source

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