Single-Walled Aluminosilicate Nanotubes with Organic-Modified Interiors

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• 作者：Dun-Yen Kang ; Ji Zang ; Christopher W. Jones ; Sankar Nair
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：April 21, 2011
• 年：2011
• 卷：115
• 期：15
• 页码：7676-7685
• 全文大小：1221K
• 年卷期：v.115,no.15(April 21, 2011)
• ISSN：1932-7455

文摘

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鈥攊ncluding nitrogen physisorption, thermogravimetric analysis, transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and solid-state NMR鈥攕trongly 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 鈥渕olecular recognition鈥?based applications for nanotube materials in areas such as catalysis, molecular encapsulation, sensing, and separation.