Surface characteristics of ionically crosslinked chitosan membranes |
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Authors: | Ayşe Gönen Karakeçili Cristina Satriano Menemşe Gümüşderelioğlu Giovanni Marletta |
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Affiliation: | 1. Chemical Engineering Department, Hacettepe University, 06800 Beytepe, Ankara, Turkey;2. Laboratory for Molecular Surfaces and Nanotechnology (LAMSUN), Dipartimento di Scienze Chimiche, University of Catania, and Consorzio Interuniversitario per i Sistemi a Grande Interfaccia (CSGI) ‐ V. le A. Doria 695125, Catania, Italy |
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Abstract: | In this study, homogenous dense chitosan membranes were prepared by solution‐casting procedure. Then the membranes were ionically crosslinked by sulfuric acid. The surfaces of chitosan membranes before and after crosslinking were characterized by using FTIR‐ATR, X‐ray photoelectron spectroscopy (XPS), and atomic‐force microscopy (AFM) techniques. The XPS data suggest that the surface composition of crosslinked membrane does not change significantly with respect to uncrosslinked membrane and the most important evidence is a certain amount of sulfur, coming from the crosslinker. The result from FTIR‐ATR data shows the effectiveness of the crosslinking procedure by the shift in amide I and amide II bands. The investigation of membrane surfaces by AFM indicates that the crosslinking procedure modifies the surface morphology of chitosan. After crosslinking, the surface topography becomes more homogenous and relatively flat. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 |
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Keywords: | chitosan membrane ionic crosslinking FTIR‐ATR XPS AFM |
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