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Author: search.filters.author.Boonchom, BanjongSubject: search.filters.subject.FTIR

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    A rapid synthesis of blue-pigment copper cyclotetraphosphate (cu2P4O12) ricelike grain nanoparticles at low temperature
    (2012-12-01)
    Chatjuthamanee, Warunthip
    ;
    Muanghlua, Rangson
    ;
    Boonchom, Banjong
    ;
    Vittayakorn, Naratip
    A blue-pigment copper cyclotetraphosphate Cu<inf>2</inf>P<inf>4</inf>O<inf>12</inf> was synthesized by a simple wet preparation method using copper oxide and phosphoric acid at 350 °C. The crystallite size obtained from X-ray line broadening is 53 ± 11 nm for the Cu<inf>2</inf>P<inf>4</inf>O<inf>12</inf>. The FTIR spectrum of Cu<inf>2</inf>P<inf>4</inf>O<inf>12</inf> is assigned a base on the P<inf>4</inf>O<inf>12</inf><sup>4-</sup> ion in the structure, which indicates the most striking feature of cyclotetraphospate. XRD and FTIR results of the synthesized CuCu<inf>2</inf>P<inf>4</inf>O<inf>12</inf> indicate the pure monoclinic phase with space group C<inf>2h</inf><sup>6</sup> (C2/c). SEM micrographs of the synthesized Cu<inf>2</inf>P<inf>4</inf>O<inf>12</inf> show rice-like grains, a porous structure and agglomerations, which are important for a specific application. The UV-Vis-NIR spectrum confirms the octahedral coordination of the Cu (II) ion and blue pigment.
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    Grass blade-like microparticle MnPO4·H2O prepared by a simple precipitation at room temperature
    (2010-11-01)
    Boonchom, Banjong
    ;
    Baitahe, Rattanai
    ;
    Joungmunkong, Zongporn
    ;
    Vittayakorn, Naratip
    Grass blade-like microparticle MnPO<inf>4</inf>·H<inf>2</inf>O was synthesized by a simple precipitation at room temperature using a mixture of manganese sulphate monohydrate, phosphoric acid and water at pH=7. The thermogravimetric study indicates that the synthesized compound is stable below 500°C and its final decomposed product is Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf>. The pure monoclinic phases of the synthesized MnPO<inf>4</inf>·H<inf>2</inf>O and its final decomposed product Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf> are verified by XRD data. FTIR spectra indicate the presences of the PO<inf>4</inf><sup>3-</sup> ion and water molecules in the MnPO<inf>4</inf>·H<inf>2</inf>O structure and the P<inf>2</inf>O<inf>7</inf><sup>4-</sup> ion in the Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf> structure. The thermal stability, crystallite size, and grass blade-like microparticle of MnPO<inf>4</inf>·H<inf>2</inf>O in this work are different from previous reports, which may be caused by the starting reagents and reaction condition for the precipitation. © 2010 Elsevier B.V.