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

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    Effect of PVP concentration on microstructure and physical properties of electrospun SnO2 nanofibers
    (2016-10-12)
    Santibenchakul, S.
    ;
    Chaiyasith, S.
    ;
    Pecharapa, W.
    The various exceptional crystalline morphologies of tin oxide (SnO<inf>2</inf>) nanofibers were fabricated using conventional electrospinning and calcination process. Polyvinylpyrrolidone (PVP) was used as polymer template and tin (IV) chloride (SnCl<inf>4</inf>·5H<inf>2</inf>O) was chosen as starting material for electrospun SnO<inf>2</inf> nanofibers. The concentration of PVP was varied from 6%w/w to 12%w/w while the concentration of SnCl<inf>4</inf>·5H<inf>2</inf>O was kept constantly. The diameter of the as-spun SnO<inf>2</inf> nanofiber was ranging from 154 to 464 nm. After calcination at 600°C for 3 h, the crystal structure can be identified to the tetragonal structure of SnO<inf>2</inf> with various morphologies. The EDX analysis confirmed the existence of major elements and formation of SnO<inf>2</inf> from starting precursor. SEM results revealed that low PVP concentration led to the formation of porous SnO<inf>2</inf> nanofibers comprising long chain of SnO<inf>2</inf> nanobeads. When the PVP concentration was reached to 12%w/w, the arrangement of crystalline of SnO<inf>2</inf> became the cluster of SnO<inf>2</inf> plates.
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    Elemental composition of Thai rice and beans by instrumental neutron activation analysis
    (2009-01-01)
    Laoharojanaphand, S.
    ;
    Busamongkol, A.
    ;
    Chaiyasith, S.
    ;
    Permnamtip, V.
    ;
    Parengam, M.
    The nutrient value of Thai rice and bean in terms of minor and trace element content has been evaluated using INAA. Six varieties of rice and six of beans bought from three local markets in 2006-2007 were investigated under this study. Elemental compositions were determined using the comparator technique. Precision, accuracy and detection limits of each element found were also calculated. Three minor (Ca, K, Mg) and eight trace elements (Al, As, Br, Cl, Cu, Fe, Mn, Zn) were determined in these Thai foods. © 2009 Akadémiai Kiadó, Budapest, Hungary.