Monitoring Transport Across Modified Nanoporous Alumina Membranes

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 nanotub...

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Main Authors:	Penumetcha, Sai S., Kona, Ravikanth, Hardin, Jonathan L., Molder, Andrew L., Steinle, Erich D.
Format:	Online
Language:	English
Published:	Molecular Diversity Preservation International (MDPI) 2007
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3965222/

id	pubmed-3965222
recordtype	oai_dc
spelling	pubmed-39652222014-03-25 Monitoring Transport Across Modified Nanoporous Alumina Membranes Penumetcha, Sai S. Kona, Ravikanth Hardin, Jonathan L. Molder, Andrew L. Steinle, Erich D. Full Research Paper 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. Molecular Diversity Preservation International (MDPI) 2007-11-23 /pmc/articles/PMC3965222/ /pubmed/28903271 Text en © 2007 by MDPI (http://www.mdpi.org). Reproduction is permitted for noncommercial purposes.
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Penumetcha, Sai S. Kona, Ravikanth Hardin, Jonathan L. Molder, Andrew L. Steinle, Erich D.
spellingShingle	Penumetcha, Sai S. Kona, Ravikanth Hardin, Jonathan L. Molder, Andrew L. Steinle, Erich D. Monitoring Transport Across Modified Nanoporous Alumina Membranes
author_facet	Penumetcha, Sai S. Kona, Ravikanth Hardin, Jonathan L. Molder, Andrew L. Steinle, Erich D.
author_sort	Penumetcha, Sai S.
title	Monitoring Transport Across Modified Nanoporous Alumina Membranes
title_short	Monitoring Transport Across Modified Nanoporous Alumina Membranes
title_full	Monitoring Transport Across Modified Nanoporous Alumina Membranes
title_fullStr	Monitoring Transport Across Modified Nanoporous Alumina Membranes
title_full_unstemmed	Monitoring Transport Across Modified Nanoporous Alumina Membranes
title_sort	monitoring transport across modified nanoporous alumina membranes
description	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.
publisher	Molecular Diversity Preservation International (MDPI)
publishDate	2007
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3965222/
_version_	1612071096930009088

Monitoring Transport Across Modified Nanoporous Alumina Membranes

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