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Author: search.filters.author.Maensiri, SantiSubject: search.filters.subject.Nanoparticles

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    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)
    Boonchom, Banjong
    ;
    Maensiri, Santi
    ;
    Youngme, Sujittra
    ;
    Danvirutai, Chanaiporn
    A new binary Mn<inf>0.5</inf>Fe<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·xH<inf>2</inf>O powder was synthesized by simple and cost-effective method using phosphoric acid, manganese and iron metals as starting chemicals. The synthesized solid shows the complex thermal transformations and the final decomposition product is a new binary manganese iron cyclo-tetraphosphate, MnFeP<inf>4</inf>O<inf>12</inf>. The X-ray diffraction and FTIR results indicate that the synthesized new binary Mn<inf>0.5</inf>Fe<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·xH<inf>2</inf>O and the decomposition MnFeP<inf>4</inf>O<inf>12</inf> powders are a pure monoclinic phase with space group P2<inf>1</inf>/n (Z = 2) and C2/c (Z = 4), respectively. The particle morphologies of Mn<inf>0.5</inf>Fe<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·xH<inf>2</inf>O and MnFeP<inf>4</inf>O<inf>12</inf> powders appear as the rod-like tetragonal shape and show a high agglomeration of small particles, which are similar to the case of Mn(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·2H<inf>2</inf>O and Fe<inf>2</inf>P<inf>4</inf>O<inf>12</inf>, respectively. Room temperature magnetization results show a ferromagnetic behavior of the Mn<inf>0.5</inf>Fe<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·xH<inf>2</inf>O and MnFeP<inf>4</inf>O<inf>12</inf> powders, having the hysteresis loops in the range of -10,000 Oe < H < +10,000 Oe with the specific magnetization values of 25.63 and 13.14 emu/g at 10 kOe, respectively. The lower magnetizations of Mn<inf>0.5</inf>Fe<inf>0.5</inf>(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·xH<inf>2</inf>O and MnFeP<inf>4</inf>O<inf>12</inf> than those of Fe(H<inf>2</inf>PO<inf>4</inf>)<inf>2</inf>·2H<inf>2</inf>O and Fe<inf>2</inf>P<inf>4</inf>O<inf>12</inf> powders indicate the presence of Mn ions in substitution position of Fe ions. © 2008 Elsevier Masson SAS. All rights reserved.
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    A simple route to synthesize nickel ferrite (NiFe2O4) nanoparticles using egg white
    (2007-05-01)
    Maensiri, Santi
    ;
    Masingboon, Chivalrat
    ;
    Boonchom, Banjong
    ;
    Seraphin, Supapan
    NiFe<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.