https://scholars.lib.ntu.edu.tw/handle/123456789/409800
標題: | Single-walled aluminosilicate nanotubes with organic-modified interiors | 作者: | Kang D.-Y. Zang J. Jones C.W. Nair S. |
公開日期: | 2011 | 卷: | 115 | 期: | 15 | 起(迄)頁: | 7676-7685 | 來源出版物: | Journal of Physical Chemistry C | 摘要: | A methodology for modifying the interior of single-walled metal oxide (aluminosilicate) nanotubes by covalently immobilizing organic functional entities on the interior surface of the nanotube structure is reported. Characterization of the modified nanotubes by a range of solid-state characterization techniques-including nitrogen physisorption, thermogravimetric analysis, transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and solid-state NMR-strongly indicates that the organic entities are immobilized on the inner surface of the nanotubes by reaction with the silanol groups on the interior wall. The resulting organic-modified single-walled nanotubes (SWNTs) show higher hydrophobicity than bare nanotubes based upon water adsorption measurements. Furthermore, a mechanistic understanding of water adsorption in the modified SWNTs is developed, by interpretation of the water adsorption data with a multilayer adsorption model. The degree of interior surface silanol substitution is estimated, with up to 35% of the silanols being substituted through the present modification chemistry. This methodology of immobilizing various functional entities at the inner wall of aluminosilicate nanotubes opens up a range of previously inaccessible "molecular recognition"-based applications for nanotube materials in areas such as catalysis, molecular encapsulation, sensing, and separation. ? 2011 American Chemical Society. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/409800 | ISSN: | 19327447 | DOI: | 10.1021/jp2010919 |
顯示於: | 化學工程學系 |
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