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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4218

Title: Ionic self-assembly of porphyrin nanostructures on the surface of charge-altered track-etched membranes
Authors: Mongwaketsi, N
Ndungu, PG
Nechaev, A
Maaza, M
Sparrow, R
Keywords: Porphyrin nanotubes
Poly-(ethylene-terephthalate)
Consolidated nanomaterial
UV-vis spectroscopy
Atomic force microscopy
Issue Date: Jan-2010
Publisher: Wiley-Blackwell
Citation: Mongwaketsi, N, Ndungu, PG et al. 2010. Ionic self-assembly of porphyrin nanostructures on the surface of charge-altered track-etched membranes. Journal of Porphyrins and Phthalocyanines, Vol. 14(5), pp 446-451
Abstract: Track-etched polymer membranes are typically used as templates in the synthesis of various nanowires or nanotubes arrays. The unique advantages of track-etched membranes, such as uniform pore structure, excellent porosity, easily tailored pore sizes, and a well characterized surface chemistry, may find use in self-assembly strategies where colloidal nanostructures can be tethered to a suitable substrate to produce devices of interest. Meso-tetrakis(4-phenylsulfonicacid)porphyrin dihydrochloride and Sn(IV) tetrakis(4-pyridyl)porphyrin were used to synthesize ionic self-assembled porphyrin nanorods. The track-etched membranes surface charge was changed from negative to positive using polyethyleneimine. The porphyrin nanorods were either filtered through or self-assembled onto the surface of track-etched membranes. Comparisons were made with track-etched membranes modified with, and without, poly ethyleneimine. Assembly of the porphyrin nanotubes only occurred on the surface of positively charged track-etched membranes, and filtration of the porphyrin nanorods produced a mesh-like structure on the surface of the membrane irrespective of the track-etched membrane pore diameter. In each case the characteristic absorbance profiles of the porphyrin nanorods was maintained. Transmission electron microscopy, scanning electron microscopy, atomic force microscopy, and UV-vis spectroscopy were used to characterize the various systems.
Description: Copyright: 2010 Wiley-Blackwell. This is the post print version. The definitive version is published in the Journal of Porphyrins and Phthalocyanines, Vol. 14(5), pp 446-451
URI: http://www.worldscinet.com/jpp/14/1405/S1088424610002276.html
http://hdl.handle.net/10204/4218
ISSN: 1088-4246
Appears in Collections:Polymers and composites
National Centre for nano-structured materials
Nanotechnology
Polymers and bioceramics
General science, engineering & technology

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