Abstract
The effects of dimethylformamide (DMF) on morphology and texture of hematite particles produced from a forced hydrolysis reaction of FeCl3 –HCl solution were investigated by transmission electron microscopy (TEM), x-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), thermogravimetry and differential thermal analysis (TG-DTA), N2 and H2O adsorption, and zeta potential measurements. The morphology of synthetic hematite particles was concentration dependent; they changed from large sphere with a diameter of ca. 600 nm to diamond-like shape with increasing DMF concentration in the aging solution accompanying a reduction of their size to 80 nm without incorporation of DMF in the particles. This fact was explained by an acceleration of phase transformation from β–FeOOH to hematite with an elevation of the solution pH owing to dimethylamine produced from a hydrolysis of DMF at an elevated temperature. TEM and XRD suggested that the diamond-like hematite particles formed above 6–10 vol% DMF possess a single-crystal nature. Gas adsorption technique revealed that the particles produced above 10 vol% DMF possess a high thermal stability. TG and FTIR indicated that the hematite particles produced with DMF contained small amounts of OH_ ions in the lattice though they provided a single-crystal nature.
Similar content being viewed by others
References
K. Kandori, Y. Kawashima, and T. Ishikawa, J. Chem. Soc. Faraday Trans. 87, 2241 (1991).
K. Kandori, S. Tamura, and T. Ishikawa, Colloid and Polym. Sci. 272, 812 (1994).
K. Kandori, A. Yasukawa, and T. Ishikawa, J. Colloid Interface Sci. 180, 446 (1996).
W. Mullin, Chem. Ind. (London) 9, 372 (1980).
S. Hamada and E. Matijević, J. Colloid Interface Sci. 84, 274 (1981).
S. Hamada and E. Matijević, J. Chem. Soc. Faraday Trans. 1 78, 2147 (1982).
M. P. Morales, T. G. Carreno, and C. J. Serna, J. Mater. Res. 7, 2538 (1992).
T. Sugimoto, A. Muramatsu, K. Sakata, and D. Shindo, J. Colloid Interface Sci. 158, 420 (1993).
T. Sugimoto, K. Sakata, and A. Muramatsu, J. Colloid Interface Sci. 159, 372 (1993).
J. E. Blendell, H. K. Bowen, and R. L. Coble, Ceram. Bull. 63, 797 (1984).
A. Yasukawa, H. Takase, K. Kandori, and T. Ishikawa, Polyhedron 13, 3071 (1994).
K. Kandori, Y. Kawashima, and T. Ishikawa, J. Colloid Interface Sci. 152, 284 (1992).
Iron Oxides in the Laboratory, edited by U. Schwertmann and R. M. Cornell (VCH, Weinheim, 1991), p. 10.
E. Wolska and U. Schwertmann, Z. fur Kristallogra. 189, 223 (1989).
G. Blyholder and E. A. Richardson, J. Phys. Chem. 66, 2599 (1962).
K. S. W. Sing, D. M. Everett, R. A. W. Haul, L. Moscou, R. A. Pierotti, J. Rouquerol, and T. Siemieniewska, Pure & Appl. Chem. 57, 603 (1985).
Adsorption, Surface Area and Porosity, 2nd ed., edited by S. J. Gregg and K. S. Sing (Academic Press, London, 1982).
T. Morimoto, M. Nagao, and F. Tokuda, J. Phys. Chem. 73, 243 (1969).
A. Tsugita, T. Takei, M. Chikazawa, and T. Kanazawa, Langmuir 6, 1461 (1990).
K. Kandori, Y. Kawashima, and T. Ishikawa, J. Mater. Sci. Lett. 12, 288 (1993).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kandori, K., Ohkoshi, N., Yasukawa, A. et al. Morphology control and texture of hematite particles by dimethylformamide in forced hydrolysis reaction. Journal of Materials Research 13, 1698–1706 (1998). https://doi.org/10.1557/JMR.1998.0235
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/JMR.1998.0235