The growth and surface properties of boehmite nanofibres and nanotubes at low temperatures using a hydrothermal synthesis route
(2007) The growth and surface properties of boehmite nanofibres and nanotubes at low temperatures using a hydrothermal synthesis route. Langmuir 23(19):pp. 9850-9859.
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Abstract
The growth of boehmite nanostructures at low temperature using a soft chemistry route with and without (PEO) surfactant is presented. Remarkably long boehmite one dimensional nanotubes/nanofibres were formed within a significantly short time by changing the reaction mechanism of aluminium hydroxide. By using the surfactant PEO as a templating agent, boehmite nanotubes up to 170 nm in length with internal and external diameter of 2~5 nm and 3~7 nm, were formed at 100 degrees Celsius. A slightly higher temperature (120 degrees Celsius) resulted in the formation of lath-like nanofibres with average length of 250 nm. Using the cationic surfactant CTAB, nanotubes rather than nanofibres were formed at 120 degrees Celsius. Without surfactant, nanotubes counted for around 20 % of the entire sample. A regular interval supply of fresh boehmite precipitate resulted in a larger crystallite size distribution of nanotubes. The morphology of nanotubes was more uniform in samples without the regular addition of aluminium hydroxide. Moreover, with the same hydrothermal time, the final nanotubes for nanomaterials without a regular interval supply of fresh aluminium hydroxide precipitate was longer than with regular aluminium hydroxide precipitate supply which is in contrast to previously published results. Higher Al/PEO concentrations resulted in the formation of shorter nanotubes. Detailed characterisation and mechanism are presented.
| Item Type: | Journal Article |
|---|---|
| Status: | Published |
| Keywords: | boehmite; nanofibres; nanotubes; hydrothermal treatment |
| Subjects: | 250000 Chemical Sciences > 250100 Physical Chemistry (incl. Structural) > 250105 Structural Chemistry 250000 Chemical Sciences > 250100 Physical Chemistry (incl. Structural) > 250104 Chemical Spectroscopy 250000 Chemical Sciences > 250100 Physical Chemistry (incl. Structural) > 250103 Colloid and Surface Chemistry |
| ID Code: | 9180 |
| Deposited By: | Frost, Ray |
| Deposited On: | 27 August 2007 |
| Alternative Locations: | http://pubs.acs.org/journals/langd5/index.html |
| Copyright Owner: | Copyright 2007 American Chemical Society |
| Copyright Statement: | The contents of this journal can be freely accessed online via the ACS web page 12 months after publication. See hypertext link. |
| Additional Information: | Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: r.frost@qut.edu.au |