Electrospun Polymer Nanofibers Reinforced by Tannic Acid/Fe+++ Complexes
AbstractWe report the successful preparation of reinforced electrospun nanofibers and fibrous mats of polyvinyl alcohol (PVA) via a simple and inexpensive method using stable tannic acid (TA) and ferric ion (Fe+++) assemblies formed by solution mixing and pH adjustment. Changes in solution pH change the number of TA galloyl groups attached to the Fe+++ from one (pH < 2) to two (3 < pH < 6) to three (pH < 7.4) and affect the interactions between PVA and TA. At pH ~ 5.5, the morphology and fiber diameter size (FDS) examined by SEM are determinant for the mechanical properties of the fibrous mats and depend on the PVA content. At an optimal 8 wt % concentration, PVA becomes fully entangled and forms uniform nanofibers with smaller FDS (p < 0.05) and improved mechanical properties when compared to mats of PVA alone and of PVA with TA (p < 0.05). Changes in solution pH lead to beads formation, more irregular FDS and poorer mechanical properties (p < 0.05). The Fe+++ inclusion does not alter the oxidation activity of TA (p > 0.05) suggesting the potential of TA-Fe+++ assemblies to reinforce polymer nanofibers with high functionality for use in diverse applications including food, biomedical and pharmaceutical. View Full-Text
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Yang, W.; Sousa, A.M.M.; Thomas-Gahring, A.; Fan, X.; Jin, T.; Li, X.; Tomasula, P.M.; Liu, L. Electrospun Polymer Nanofibers Reinforced by Tannic Acid/Fe+++ Complexes
. Materials 2016, 9, 757.
Yang W, Sousa AMM, Thomas-Gahring A, Fan X, Jin T, Li X, Tomasula PM, Liu L. Electrospun Polymer Nanofibers Reinforced by Tannic Acid/Fe+++ Complexes
. Materials. 2016; 9(9):757.
Yang, Weiqiao; Sousa, Ana M.M.; Thomas-Gahring, Audrey; Fan, Xuetong; Jin, Tony; Li, Xihong; Tomasula, Peggy M.; Liu, LinShu. 2016. "Electrospun Polymer Nanofibers Reinforced by Tannic Acid/Fe+++ Complexes
." Materials 9, no. 9: 757.
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