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- W1972507972 abstract "Abstract The effects of urotropin (hexamethylenetetramine) on the chemical and microstructural properties of Fe-oxide powders, prepared by FeCl3 hydrolysis in aqueous solutions at 90°C, were investigated using X-ray powder diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy (FTIR) and 57Fe Mossbauer spectroscopy. In the absence of urotropin, akaganeite (β-FeOOOH) particles showed different morphologies, such as spindles, stars, X- and Y-shapes. After 5 h of aging and for an initial 0.025 M urotropin concentration, acicular β-FeOOH particles (monodispersed) of decreased size were obtained. For the same aging time and 0.25 M urotropin the particles were amorphous for X-ray diffraction, while 57Fe Mossbauer spectroscopy indicated that these particles were of very small dimensions (super paramagnetic) and probably of the FeOOH structure. The β-FeOOH formation at pH values significantly higher than pH = 2 was explained by incomplete substitution of CI− ions in Fe (III)-hydroxy polymers with OH− ions. No evidence of organic components on the solid hydrolytical products was detected by FTIR spectroscopy. After 7 days of aging and for an initial urotropin concentration of up to 0.025 M, β-FeOOH wa also obtained as a single phase, while for c≥ 0.1 M urotropin mixtures of goethite (α-FeOOH) and haematite (α-Fe2O3) were formed. Phase transformations β-FeOOH → α-Fe2O3 and β-FeOOH → α-FeOOH → α-Fe2O3 were discussed in the sense of the dissolution/precipitation mechanism." @default.
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- W1972507972 date "1998-03-01" @default.
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- W1972507972 title "Effects of urotropin on the chemical and microstructural properties of Fe-oxide powders prepared by the hydrolysis of aqueous FeCl3 solutions" @default.
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- W1972507972 doi "https://doi.org/10.1016/s0254-0584(97)02032-4" @default.
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