原位和异位浸渍法制备氧化铜-细菌纤维素纳米杂化材料的特性研究。
Characterization of CuO-bacterial cellulose nanohybrids fabricated by in-situ and ex-situ impregnation methods.
机构信息
Department of Food Science and Technology, Faculty of Agriculture, Urmia University, Urmia, P.O. Box 57561-51818, Iran.
Department of Food Science and Technology, Faculty of Agriculture, Urmia University, Urmia, P.O. Box 57561-51818, Iran.
出版信息
Carbohydr Polym. 2019 Oct 15;222:114995. doi: 10.1016/j.carbpol.2019.114995. Epub 2019 Jun 12.
The aim of this research was to fabricate CuO-bacterial cellulose (BC) nanohybrids by two in-situ synthesis methods including sonochemical and precipitation methods. The ex-situ synthesized nanohybrid was also prepared by immersing BC pellicles in commercial CuO dispersion. FT-IR analysis confirmed the formation of real nanohybrid by occurring new interactions between CuO-NPs and BC. XRD results approved no disruption effect of nanohybrid formation on the crystallinity index of BC nanofibers. FE-SEM results indicated the formation of small sized NPs attached to the inner space of BC network at in-situ synthesized nanohybrids. But agglomerated NPs precipitated on the surface of BC layer was observed for ex-situ synthesized sample. In spite of higher loading capacity of ex-situ method, the in-situ synthesized nanohybrids exhibited lower release rate of NPs into the water. The antibacterial activity of ex-situ synthesized nanohybrid against S.aureus and E.coli bacteria was more than both of in-situ synthesized samples.
本研究旨在通过两种原位合成方法（包括超声化学法和沉淀法）制备氧化铜-细菌纤维素（BC）纳米杂化材料。还通过将 BC 薄膜浸入商业 CuO 分散体中来制备异位合成的纳米杂化物。FT-IR 分析证实了通过在 CuO-NPs 和 BC 之间发生新的相互作用形成真正的纳米杂化物。XRD 结果表明，纳米杂化形成对 BC 纳米纤维结晶度指数没有破坏作用。FE-SEM 结果表明，在原位合成的纳米杂化物中，形成了附着在 BC 网络内部空间的小尺寸 NPs。但是，对于异位合成的样品，观察到沉淀在 BC 层表面的团聚 NPs。尽管异位法的负载能力更高，但原位合成的纳米杂化物表现出较低的 NPs 向水中释放速率。与 S.aureus 和 E.coli 细菌相比，异位合成纳米杂化物的抗菌活性更高。
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