Boonchom, Banjong
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Boonchom, Banjong
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BOONCHOM, Banjong
Boonchom, B.
Boonchom, And Banjong
Boonchoma, Banjong
Boomchom, Banjong
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banjong.bo@kmitl.ac.th
24 results
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Item type:Publication, Kinetics and thermodynamics of thermal decomposition of synthetic AlPO 4•2H2O(2009-12-01); Danvirutai, ChanaipornThe non-isothermal kinetics of dehydration of AlPO<inf>4</inf>•2H <inf>2</inf>O was studied in dynamic air atmosphere by TG-DTG-DTA at different heating rates. The result implies an important theoretical support for preparing AlPO<inf>4</inf>. The AlPO<inf>4</inf>•2H<inf>2</inf>O decomposes in two step reactions occurring in the range of 80-150 °C. The activation energy of the second dehydration reaction of AlPO<inf>4</inf>•2H<inf>2</inf>O as calculated by Kissinger method was found to be 69.68 kJ mol<sup>-1</sup>, while the Avrami exponent value was 1.49. The results confirmed the elimination of water of crystallization, which related with the crystal growth mechanism. The thermodynamic functions (ΔH*, ΔG*and ΔS*) of the dehydration reaction are calculated by the activated complex theory. These values in the dehydration step showed that it is directly related to the introduction of heat and is non-spontaneous process. © 2009 Akadémiai Kiadó, Budapest, Hungary. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A simple synthesis and room temperature magnetic properties of new binary Mn0.5Fe0.5(H2PO4)2·xH2O obtained from a rapid co-precipitation at ambient temperature(2009-02-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A simple route to synthesize nickel ferrite (NiFe2O4) nanoparticles using egg white(2007-05-01); Seraphin, SupapanNiFe<inf>2</inf>O<inf>4</inf> nanoparticles were synthesized by a simple and cost-effective method using Ni and Fe nitrates and freshly extracted egg white (ovalbumin) in an aqueous medium. The X-ray diffraction and selected-area electron diffraction results indicated that the synthesized nanoparticles have only the inverse spinel structure without the presence of any other phase impurities. Room temperature magnetization results showed a ferromagnetic behavior of the NiFe<inf>2</inf>O<inf>4</inf> nanoparticles, with saturation-specific magnetization values in the range of 26.4-42.5 emu/g at 10 kOe. © 2006 Acta Materialia Inc. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermodynamic and kinetic properties of the formation of Mn 2P2O7 by thermal decomposition of Mn(H 2PO2)2·H2O(2009-03-12) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Parallelogram-like microparticles of calcium dihydrogen phosphate monohydrate (Ca(H2PO4)2·H2O) obtained by a rapid precipitation route in aqueous and acetone media(2009-08-12)Calcium dihydrogenphosphate monohydrate (Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·H<inf>2</inf>O) was prepared by a rapid and simple precipitation method using CaCO<inf>3</inf> and H<inf>3</inf>PO<inf>4</inf> in aqueous and acetone media at ambient temperature. The thermal transformation of the synthesized Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·H<inf>2</inf>O at 500 °C was obtained to be CaP<inf>2</inf>O<inf>6</inf> occurred through the dehydration and the phosphate condensation reactions, as revealed by thermoanalytical techniques (TG/DTG/DTA). The synthesized Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·H<inf>2</inf>O and its decomposition product CaP<inf>2</inf>O<inf>6</inf> were characterized by X-ray powder diffraction (XRD), Fourier transfer infrared (FTIR) spectroscopy and scanning electron microscope (SEM). Thermal behavior and the morphology of the synthesized Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·H<inf>2</inf>O in aqueous and acetone media are compared with those of other works. The SEM micrograph of Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·H<inf>2</inf>O show parallelogram-like microparticles containing small and large grain sizes. The aqueous and acetone media are proposed to play an important role in the synthetic process of calcium phosphates in exhibiting different physical properties, which are important for specific applications. © 2009 Elsevier B.V. All rights reserved. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Study of the dehydration of Co(H2PO4) 2-2H2O(2009-04-09); Danvirutai, ChanaipornThe thermal transformation of Co(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf> 2H<inf>2</inf>O was studied under a dry air atmosphere using TG-DTG-DTA. The TG-DTG-DTA curves show that the transformation occurs in three steps, which are dehydration processes. Co(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf> · 2H<inf>2</inf>O and its thermal transformation product were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR), and UV-vis near-IR techniques. The nonisothermal kinetics of Co(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf> · 2H<inf>2</inf>O was studied by means of the Kissinger method. The specificity of the thermal transformation was characterized by identification of the bonds to be selectively activated because of energy absorption at the vibrational level, which are confirmed by the comparison of calculated wavenumbers and observed wavenumbers of the FTIR spectra. The activated complex theory has been applied to each step of the reactions, and the thermodynamic functions δH <sup>≠</sup>, δG<sup>≠</sup>, and δS<sup>≠</sup> are calculated. These values for three stages showed that they are connected with the introduction of heat and are nonspontaneous processes. © 2009 American Chemical Society. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Non-isothermal decomposition kinetics of NiFe2O4 nanoparticles synthesized using egg white solution route(2009-01-01); Maensiri, SantiThe thermal decomposition kinetics of nickel ferrite (NiFe <inf>2</inf>O<inf>4</inf>) precursor prepared using egg white solution route in dynamical air atmosphere was studied by means of TG with different heating rates. The activation energy (E <inf>α</inf>) values of one reaction process were estimated using the methods of Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS), which were found to be consistent. The dependent activation energies on extent of conversions of the decomposition reaction indicate "multi-step" processes. XRD, SEM and FTIR showed that the synthesized NiFe<inf>2</inf>O<inf>4</inf> precursor after calcination at 773 K has a pure spinel phase, having particle sizes of ~54 ± 29 nm. © 2009 Akadémiai Kiadó, Budapest, Hungary. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple synthesis, magnetic properties, and nonisothermal decomposition kinetics of Fe(H2PO4)2 · 2H2O(2008-10-15); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Thermal decomposition kinetics of FePO4·3H2O precursor to synthetize spherical nanoparticles FePO4(2007-12-19); Danvirutai, ChanaipornThe thermal decomposition of iron phosphate trihydrate FePO <inf>4</inf>·3H<inf>2</inf>O was investigated in air using TG-DTG/DTA. The FePO<inf>4</inf>·3H<inf>2</inf>O decomposes in two steps, and the final decomposition product (FePO<inf>4</inf>) was studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) spectroscopy. The activation energies of the second dehydration reaction of FePO<inf>4</inf>·3H<inf>2</inf>O were calculated through the isoconversional methods of Ozawa and Kissinger-Akahira-Sunose (KAS), and the possible conversion functions have been estimated through the Coats-Redfern method. The specificity of thermal decomposition was characterized by identification of the bonds to be selectively activated due to energy absorption at the vibrational level, which was assigned by comparing the calculated wavenumbers with the observed wavenumbers in FTIR spectra. The kinetic model that better describes the second reaction of dehydration for FePO <inf>4</inf>·3H<inf>2</inf>O is the F<inf>n</inf> model as a simple n-order reaction, and the corresponding function is xc4(α) = (1-α)<sup>2.50</sup> and g(α) = -[1-(1-α)<sup>-1.50</sup>/(1. 50)]. © 2007 American Chemical Society. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Rapid coprecipitation and non-isothermal decomposition kinetics of new binary Mn0.5CU0.5(H2PO4) 2·1.5H2O(2008-05-07); Danvirutai, ChanaipornNew binary metal dihydrogen phosphate dihydrate Mn<inf>0.5</inf>Cu <inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·1.5H <inf>2</inf>O was synthesized by a rapid and simple coprecipitation method using phosphoric acid, manganese metal, and copper oxide at ambient temperature. The thermal stability of Mn<inf>0.5</inf>Cu<inf>0.5</inf>(H<inf>2</inf>PO <inf>4</inf>)<inf>2</inf>·1.5H<inf>2</inf>O was studied by means of the non-isothermal kinetics (Kissinger method). The synthesized Mn <inf>0.5</inf>Cu<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>· 1.5H<inf>2</inf>O shows complex thermal transformations, and its final decomposition product was a binary metal cyclotetraphosphate, MnCuP <inf>4</inf>O<inf>12</inf>. The X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis-near-IR, and Fourier transform IR (FTIR) results of the synthesized Mn<inf>0.5</inf>Cu<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>) <inf>2</inf>·1.5H<inf>2</inf>O and the decomposed MnCuP<inf>4</inf>O <inf>12</inf> appear to be very similar to those of M(H<inf>2</inf>PO <inf>4</inf>)<inf>2</inf>·2H<inf>2</inf>O and M<inf>2</inf>P <inf>4</inf>O<inf>12</inf> (M = Mn and Cu), which indicate the monoclinic phase with space group P2<inf>1</inf>/n and C2/c, respectively. The dominant features of the synthesized Mn<inf>0.5</inf>Cu<inf>0.5</inf>(H<inf>2</inf>PO <inf>4</inf>)<inf>2</inf>·1.5H<inf>2</inf>O and the decomposition product MnCuP<inf>4</inf>O<inf>12</inf> are compared with those of M(H <inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·2H<inf>2</inf>O and M <inf>2</inf>P<inf>4</inf>O<inf>12</inf> (M = Cu and Mn), respectively. © 2008 American Chemical Society.