Monitoring Transport Across Modified Nanoporous Alumina Membranes
| Autor: | Jonathan L. Hardin, Erich D. Steinle, Andrew L. Molder, Sai S. Penumetcha, Ravikanth Kona |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
spectroscopy
Nanotube Analytical chemistry silanization Infrared spectroscopy lcsh:Chemical technology sensors Biochemistry Full Research Paper nanotubes Analytical Chemistry chemistry.chemical_compound Molecule lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation Alkyl chemistry.chemical_classification Silanes Nanoporous technology industry and agriculture membrane modification Porous alumina membranes equipment and supplies Atomic and Molecular Physics and Optics Membrane chemistry Chemical engineering Silanization |
| Zdroj: | Sensors (Basel, Switzerland) Sensors Volume 7 Issue 11 Pages: 2942-2952 Sensors, Vol 7, Iss 11, Pp 2942-2952 (2007) |
| ISSN: | 1424-8220 |
| DOI: | 10.3390/s7112942 |
| Popis: | This paper describes the use of several characterization methods to examine alumina nanotubule membranes that have been modified with specific silanes. The function of these silanes is to alter the transport properties through the membrane by changing the local environment inside the alumina nanotube. The presence of alkyl groups, either long (C18) or short and branched (isopropyl) hydrocarbon chains, on these silanes significantly decreases the rate of transport of permeant molecules through membranes containing alumina nanotubes as monitored via absorbance spectroscopy. The presence of an ionic surfactant can alter the polarity of these modified nanotubes, which correlates to an increased transport of ions. Fluorescent spectroscopy is also utilized to enhance the sensitivity of detecting these permeant molecules. Confirmation of the alkylsilane attachment to the alumina membrane is achieved with traditional infrared spectroscopy, which can also examine the lifetime of the modified membrane. The physical parameters of these silane-modified porous alumina membranes are studied via scanning electron microscopy. The alumina nanotubes are not physically closed off or capped by the silanes that are attached to the alumina surfaces. |
| Databáze: | OpenAIRE |
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