Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-27T14:27:33.240Z Has data issue: false hasContentIssue false
  • English
  • Français

Imogolite Synthesis at 25°C

Published online by Cambridge University Press:  02 April 2024

Shin-ichiro Wada
Shin-ichiro Wada*
Affiliation:
Department of Agricultural Chemistry, Kyushu University 46, Fukuoka 812, Japan
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Imogolite was synthesized at 25°C by aging partially neutralized solutions containing monomeric silicic acid and polymeric hydroxy-aluminum ions for 7 years. Solutions having an initial Si/Al molar ratio of about 0.5 and pHs of 4.0–4.5 produced the largest yields of imogolite, followed by those having an initial Si/Al ratio of about 1, although imogolite was not the principal product. Electron microscopic examination showed a small amount of imogolite fibers embedded in a noncrystalline gel-like substance. Traces of imogolite were detected in solutions having an initial Si/Al ratio of about 2, but no imogolite was found by electron microscopy in products from solutions having an initial Si/Al ratio of about 4. Only gibbsite formed from solutions having initial Si/Al ratios of <0.27. The diameter of the tubular structural unit of the imogolite produced in these experiments was 23 ± 2Å, close to that of natural imogolite.

Keywords

FiberImogoliteInfrared spectroscopySynthesisTransmission electron microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 5 , October 1987 , pp. 379 - 384
Copyright
Copyright © 1987, The Clay Minerals Society

References

Chesworth, W., 1972 The stability of gibbsite and boemite at the surface of the earth Clays & Clay Minerals 20 369 – 374.CrossRefGoogle Scholar
Cradwick, P. D. G. Farmer, V. C., Russell, J. D., Masson, C. R., Wada, K. and Yoshinaga, N., 1972 Imogolite, a hydrated aluminium silicate of tubular structure Nature Phys. Sci. 240 187 – 189.CrossRefGoogle Scholar
Farmer, V. C., Fraser, A. R. and Tait, J. M., 1977 Synthesis of imogolite: A tubular aluminium silicate polymer J. Chem. Soc. Chem. Comm. 13 462 – 463.CrossRefGoogle Scholar
Farmer, V. C., Fraser, A. R., Mortland, M. M. and Farmer, V. C., 1978 Synthetic imogolite, a tubular hydroxyaluminium silicate Proc. Int. Clay Conf., Oxford, 1978 Amsterdam Elsevier 547 – 553.Google Scholar
Farmer, V. C. and Fraser, A. R., 1982 Chemical and colloidal stability of sols in the Al2O3-Fe2O3-SiO2-H2O system: Their role in podzolization J. Soil Sci. 33 733 – 742.CrossRefGoogle Scholar
Farmer, V. C., Smith, B. F. L. and Tait, J. M., 1979 The stability, free energy and heat of formation of imogolite Clay Miner. 14 103 – 107.CrossRefGoogle Scholar
Henmi, T. and Wada, K., 1976 Morphology and composition of allophane Amer. Mineral. 61 379 – 390.Google Scholar
Inoue, K. and Huang, P. M., 1985 Influence of citric acid on the formation of short-range ordered aluminosilicates Clays & Clay Minerals 33 312 – 322.CrossRefGoogle Scholar
Kitagawa, Y., 1971 The “unit particle” of allophane A mer. Mineral. 56 465 – 475.Google Scholar
Parfitt, R. L., Furkert, R. J. and Henmi, T., 1980 Identification and structure of two types of allophane from volcanic ash soils and tephra Clays & Clay Minerals 28 328 – 334.CrossRefGoogle Scholar
Singh, S. S., 1974 The solubility product of gibbsite at 15, 25, and 35°C Soil Sci. Soc. Amer. Proc. 38 415 – 417.CrossRefGoogle Scholar
Tait, J. M., Yoshinaga, N. and Mitchell, B. D., 1978 The occurrence of imogolite in some Scottish soils Soil Sci. Plant Nutr. 24 145 – 151.CrossRefGoogle Scholar
Wada, K., Henmi, T., Yoshinaga, N. and Patterson, S. H., 1972 Imogolite and allophane formed in saprolite of basalt on Maui, Hawaii Clays & Clay Minerals 20 375 – 380.CrossRefGoogle Scholar
Wada, S.-I., 1986 Modification of 8-quinolinolate extraction method for determination of monomelic aluminum ions Jap. J. Soil Sci. Plant Nutr. 57 506 – 508.Google Scholar
Wada, S.-I. Eto, A. and Wada, K., 1979 Synthetic allophane and imogolite J. Soil Sci. 30 347 – 355.CrossRefGoogle Scholar
Wada, S.-I. and Wada, K., 1980 Composition and structure of hydroxy-aluminosilicate ions J. Soil Sci. 31 457 – 467.CrossRefGoogle Scholar
Wada, S.-I. and Wada, K., 1982 Effect of substitution of germanium for silicon in imogolite Clays & Clay Minerals 30 123 – 128.CrossRefGoogle Scholar
Yoshinaga, N., Nakai, M., Minagawa, T. and Henmi, T., 1984 Formation of imogolite and allophane in shattered sandstone underlying brown forest soil Soil Sci. Plant Nutr. 30 555 – 567.CrossRefGoogle Scholar