Penumetcha Sai S, Kona Ravikanth, Hardin Jonathan L, Molder Andrew L, Steinle Erich D
Department of Chemistry, Missouri State University, 901 South National Avenue, Springfield, MO 65897, USA.
Sensors (Basel). 2007 Nov 23;7(11):2942-2952. doi: 10.3390/s7112942.
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.
本文描述了使用几种表征方法来研究用特定硅烷改性的氧化铝纳米管膜。这些硅烷的作用是通过改变氧化铝纳米管内部的局部环境来改变膜的传输特性。这些硅烷上存在长链（C18）或短支链（异丙基）烃链的烷基，会显著降低透过含氧化铝纳米管的膜的渗透分子的传输速率，这是通过吸收光谱监测的。离子表面活性剂的存在可以改变这些改性纳米管的极性，这与离子传输增加相关。荧光光谱也用于提高检测这些渗透分子的灵敏度。通过传统的红外光谱可以确认烷基硅烷与氧化铝膜的附着，红外光谱还可以检测改性膜的寿命。通过扫描电子显微镜研究了这些硅烷改性的多孔氧化铝膜的物理参数。氧化铝纳米管并没有被附着在氧化铝表面的硅烷物理封闭或覆盖。
