Abstract
TEMPO nanofibrillated cellulose (TNFC) was used in different concentrations (0, 30, 50, and 70 wt%, all based on the mass of cellulose-copper hybrid material) as template to synthesize copper nanoparticles from copper sulfate; the resulting hybrid material was mixed with polyvinyl alcohol to prepare films. The final composite films were evaluated effectively in terms of their antimicrobial properties against Escherichia coli DH5α and in terms of the copper release from the films on deionized water. Copper concentration was determined by inductively coupled plasma optical emission spectroscopy. The results indicate that increasing the cellulosic material concentration will facilitate the control of copper release from the films. Data regarding to copper release rate was modeled by empirical models; the results indicate that copper release obeys the power law when TNFC is at a low concentration (≤30 %), and presents an exponential behavior when TNFC concentration increase up to 70 % (coefficient R2 is 0.9951).
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Abbreviations
- TEMPO:
-
2,2,6,6-tetramethylpiperidine-1-oxyl radical
- TNFC:
-
TEMPO nanofibrillated cellulose
- PVA:
-
Polyvinyl alcohol
- CuNPs:
-
Copper nanoparticles
- DI:
-
Deionized water
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Acknowledgments
Funding for this work has been provided by the USDA NIFA Grant No. 2013-34638-21481 “Development of novel hybrid cellulose nanocomposite film with potent biocide properties utilizing low quality Appalachian hardwoods” and NIFA McStennis WVA00098 “Efficient utilization of biomass for biopolymers in central Appalachia”. The authors also thank Dr. Ronald Sabo from USDA Forest Product Laboratory (FPL) for supplying TEMPO nanofibrillated cellulose gel.
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Jiang, C., Oporto, G.S., Zhong, T. et al. TEMPO nanofibrillated cellulose as template for controlled release of antimicrobial copper from PVA films. Cellulose 23, 713–722 (2016). https://doi.org/10.1007/s10570-015-0834-5
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DOI: https://doi.org/10.1007/s10570-015-0834-5