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Sensors 2007, 7(11), 2942-2952; doi:10.3390/s7112942

Monitoring Transport Across Modified Nanoporous Alumina Membranes

Department of Chemistry, Missouri State University, 901 South National Avenue, Springfield, MO 65897, USA
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Author to whom correspondence should be addressed.
Received: 12 September 2007 / Accepted: 22 November 2007 / Published: 23 November 2007
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Abstract

This paper describes the use of several characterization methods to examinealumina nanotubule membranes that have been modified with specific silanes. The functionof these silanes is to alter the transport properties through the membrane by changing thelocal environment inside the alumina nanotube. The presence of alkyl groups, either long(C18) or short and branched (isopropyl) hydrocarbon chains, on these silanes significantlydecreases the rate of transport of permeant molecules through membranes containingalumina nanotubes as monitored via absorbance spectroscopy. The presence of an ionicsurfactant can alter the polarity of these modified nanotubes, which correlates to anincreased transport of ions. Fluorescent spectroscopy is also utilized to enhance thesensitivity of detecting these permeant molecules. Confirmation of the alkylsilaneattachment to the alumina membrane is achieved with traditional infrared spectroscopy,which can also examine the lifetime of the modified membrane. The physical parameters ofthese silane-modified porous alumina membranes are studied via scanning electronmicroscopy. The alumina nanotubes are not physically closed off or capped by the silanesthat are attached to the alumina surfaces. View Full-Text
Keywords: Porous alumina membranes; sensors; nanotubes; silanization; membrane modification; spectroscopy. Porous alumina membranes; sensors; nanotubes; silanization; membrane modification; spectroscopy.
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Penumetcha, S.S.; Kona, R.; Hardin, J.L.; Molder, A.L.; Steinle, E.D. Monitoring Transport Across Modified Nanoporous Alumina Membranes. Sensors 2007, 7, 2942-2952.

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