Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
Clay Minerals Signup for GSW Email News
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Clay Minerals; September 2002; v. 37; no. 3; p. 451-456; DOI: 10.1180/0009855023730052
© 2002 Mineralogical Society of Great Britain and Ireland
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via ISI Web of Science (3)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by OHASHI, F.
Right arrow Articles by TOMURA, S.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Research Paper

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

F. OHASHI1,*, S.-I. WADA2, M. SUZUKI3, M. MAEDA1 and S. TOMURA1

1 Ceramics Research Institute, AIST Chubu, Shimo-Shidami, Moriyama, Nagoya 463-8560, 2 Agricultural Department, Kyushu University, 6-10-1 Higashi, Hakozaki, Fukuoka 812-8581, and 3 Research Center for Deep Geological Environments, AIST Tsukuba, 1-1-1, Higashi, Tsukuba 305-8567, Japan

* E-mail: f.ohashi{at}aist.go.jp

(Received 5 September 2001; revised 16 January 2002)

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.

KEYWORDS: nanoengineering, porous solids, allophane synthesis, spherical hollow structure, adsorption isotherms






JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2008 by Mineralogical Society of Great Britain and Ireland