Selective Modification of Halloysite Lumen with Octadecylphosphonic Acid: New Inorganic Tubular Micelle
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- 12 January 2012
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 134 (3), 1853-1859
- https://doi.org/10.1021/ja210258y
Abstract
Selective fatty acid hydrophobization of the inner surface of tubule halloysite clay is demonstrated. Aqueous phosphonic acid was found to bind to alumina sites at the tube lumen and did not bind the tube's outer siloxane surface. The bonding was characterized with solid-state nuclear magnetic resonance (29Si, 13C, 31P NMR), Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy. NMR and FTIR spectroscopy of selectively modified tubes proved binding of octadecylphosphonic acid within the halloysite lumen through bidentate and tridentate P–O–Al linkage. Selective modification of the halloysite clay lumen creates an inorganic micelle-like architecture with a hydrophobic aliphatic chain core and a hydrophilic silicate shell. An enhanced capacity for adsorption of the modified halloysite toward hydrophobic derivatives of ferrocene was shown. This demonstrates that the different inner and outer surface chemistry of clay nanotubes can be used for selective modification, enabling different applications from water purification to drug immobilization and controlled release.Keywords
This publication has 66 references indexed in Scilit:
- Films of Halloysite Nanotubes Sandwiched between Two Layers of Biopolymer: From the Morphology to the Dielectric, Thermal, Transparency, and Wettability PropertiesThe Journal of Physical Chemistry C, 2011
- Use of Naturally Occurring Halloysite Nanotubes for Enhanced Capture of Flowing CellsLangmuir, 2010
- Halloysite Tubes as Nanocontainers for Anticorrosion Coating with BenzotriazoleACS Applied Materials & Interfaces, 2009
- Ferrocene Derivatives Included in a Water-Soluble Cavitand: Are They Electroinactive?Organic Letters, 2008
- The first biopolymer-wrapped non-carbon nanotubesNanotechnology, 2008
- Surface Modification of Aluminosilicate Nanofiber “Imogolite”Chemistry Letters, 2001
- Hydrolysis of (.gamma.-aminopropyl)triethoxysilane-silylated imogolite and formation of a silylated tubular silicate-layered silicate nanocompositeLangmuir, 1991
- Silylation of a tubular aluminosilicate polymer (imogolite) by reaction with hydrolyzed (.gamma.-aminopropyl)triethoxysilaneLangmuir, 1990
- Carbon-13 NMR chemical shifts and the microstructure of polymersAccounts of Chemical Research, 1981
- The vibrational spectra and structure of ferrocene and ruthenoceneSpectrochimica Acta, 1958