Synthetic allophane from high-concentration solutions: Nanoengineering of the porous solid

F. Ohashi, S. I. Wada, M. Suzuki, M. Maeda, S. Tomura

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56 Citations (Scopus)


The amorphous aluminosilicate allophane was synthesized by rapid mixing of inorganic solutions with high initial concentrations (10-100 mmol/l) followed by hydrothermal treatment. X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed homogeneous products having a hollow spherical amorphous structure with a particle diameter of 3-5 nm. The amorphous products had a high BET specific surface area (490-552 m2/g) in comparison with natural allophane and had a narrow pore-size distribution (2-5 nm in diameter). The results of water vapour adsorption isotherm studies showed a gradual increase over the range of relative water vapour pressure of 0.6-0.9 and reached a maximum of ~85 wt.%. The synthetic allophane shows promise as an adsorbent material because of its high adsorption-desorption capacity and its unique structure.

Original languageEnglish
Pages (from-to)451-456
Number of pages6
JournalClay Minerals
Issue number3
Publication statusPublished - Sept 2002

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology


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