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Access type: UnknownAuthor: search.filters.author.Chaiyasith, Pachernchaipat

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    Facile, alternative synthesis of spherical-like ca(H2PO4)2•H2O nanoparticle by aqueous-methanol media
    (2013-08-30)
    Kongteweelert, Samart
    ;
    Ruttanapun, Chesta
    ;
    Thongkam, Montree
    ;
    Chaiyasith, Pachernchaipat
    ;
    Woramongkonchai, Somsak
    Spherical-like calcium dihydrogenphosphate monohydrate (Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>•H<inf>2</inf>O) nanostructure was successfully prepared by the mixing of calcium carbonate and phosphoric in aqueous-methanol media at ambient temperature for 30 min. Three thermal decomposition step and higher stability at over 800°C of the prepared sample are different from the earlier works. Spherical-like Ca(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>•H<inf>2</inf>O nanostructure with diameter < 100 nm confirmed by SEM may be important for potential applications. This method of synthesis by aqueous-methanol media is a fast and simple method and it is expected to be applicable for the synthesis of other nanocrystalline calcium phosphates. © (2013) Trans Tech Publications, Switzerland.
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    A simple route to synthesize ferromagnetic binary calcium iron pyrophosphate CaFeP2O2 using aqueous-acetone media
    (2013-08-30)
    Chaiyasith, Pachernchaipat
    ;
    Ruttanapun, Chesta
    ;
    Thongkam, Montree
    ;
    Kongteweelert, Samart
    ;
    Woramongkonchai, Somsak
    A binary calcium iron pyrophosphate CaFeP<inf>2</inf>O<inf>7</inf> was synthesized by solid state route using the mixing of calcium carbonate, iron metal and phosphoric acid in aqueous-acetone media at 600°C. The XRD datum indicates the formation of CaFeP<inf>2</inf>O<inf>7</inf> phase without the presence of any phase impurities. FTIR result indicates the presence of the P<inf>2</inf>O<inf>7</inf> <sup>4-</sup> anion in the structure. Sheet-like microparticle of CaFeP<inf>2</inf>O<inf>7</inf> was revealed by SEM. Room temperature magnetization result showed ferromagnetic behavior of the synthesized CaFeP<inf>2</inf>O<inf>7</inf>, with saturation-specific magnetization value of 11.067 emu g<sup>-1</sup> at 10kOe. The magnetic feature of the synthesized CaFeP<inf>2</inf>O<inf>7</inf> in this work compared with M<inf>2</inf>P<inf>2</inf>O<inf>7</inf> (M = Ca and Fe), its isotypic (CaMP2O7 (M= Mn and Co) and CFeP<inf>2</inf>O<inf>7</inf> (C= Co and Cu) reported in our previous works is important properties for specific applications. © (2013) Trans Tech Publications, Switzerland.
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    A new synthesis of BaHPO4 precipitated by BaCO3-H4PO4-NaOH system at room temperature
    (2013-08-30)
    Boonchom, Banjong
    ;
    Ruttanapun, Chesta
    ;
    Thongkam, Montree
    ;
    Chaiyasith, Pachernchaipat
    ;
    Woramongkonchai, Somsak
    Barium hydrogenphosphate, BaHPO<inf>4</inf> was synthesized for the first time through simple and rapid method using BaCO<inf>3</inf>-H<inf>3</inf>PO<inf>4</inf>-NaOH, pH =9.0 at room temperature for 30 min. The studied BaHPO<inf>4</inf> decomposed in a single well-defined stage via deprotonated hydrogenphosphate reactions, revealed by TG/DTG and DSC techniques. The calculated wavenumbers based on DSC peak were comparable with FTIR results, which support the breaking bonds of P-OH (HPO<inf>4</inf><sup>2-</sup>) in the deprotonated hydrogenphosphate reactions. The thermodynamic functions (ΔH*, ΔG*, and ΔS*) for the deprotonated hydrogenphosphate reactions calculated from DSC data indicate that the deprotonated HPO<inf>4</inf><sup>2-</sup> reaction occur a lower-energy pathway and spontaneous process. The FTIR, XRD and SEM data of the studied BaHPO<inf>4</inf> and its decomposed product Ba<inf>4</inf>P<inf>2</inf>O<inf>7</inf> are also reported. © (2013) Trans Tech Publications, Switzerland.