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首页> 外文期刊>Arabian Journal for Science and Engineering >Synthesis of Chitosan-TiO2 Antimicrobial Composites via a 2-Step Process of Electrospinning and Plasma Sputtering
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Synthesis of Chitosan-TiO2 Antimicrobial Composites via a 2-Step Process of Electrospinning and Plasma Sputtering

机译：通过电纺丝和等离子溅射两步法合成壳聚糖-TiO2抗菌复合材料

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摘要

Electrospun chitosan (Cs) fibers were deposited with titanium dioxide particles through plasma- enhanced chemical vapor process using a compact planar magnetron device. Molecular constructs of Cs and Cs-TiO were modeled using the Gaussian software package to investigate their physicochemical properties and establish the mechanism of interaction between biopolymer and metal oxide. XRD crystalline peak at confirmed the integration of into the chitosan fibers. Both experiment and simulation confirmed Cs and combined to become one composite unit Cs-TiO via the glycosidic bond C-O-C of the glucose ring. FTIR and simulated vibrational spectra showed band splittings at 978 and , respectively, which suggests the integration and intermolecular attraction between Cs and at said linkage. SEM shows beads of 100-200 nm sizes scattered over the chitosan fibers. The molecular model of Cs-TiO showed optimized geometry with larger dipole moment, higher negative energy, lower ionization potential and narrower HOMO-LUMO energy gap compared to pure Cs; indicative of a resultant composite with enhanced structure and reactivity. Composites synthesized at longer plasma treatment time showed better dispersion of deposits exhibiting higher antimicrobial power with inhibition zones approximately 11.5 mm in diameter.
机译：使用紧凑的平面磁控管设备通过等离子增强化学气相法将静电纺丝的壳聚糖（Cs）纤维与二氧化钛颗粒沉积在一起。使用高斯软件包对Cs和Cs-TiO的分子结构进行建模，以研究其理化性质并建立生物聚合物与金属氧化物之间相互作用的机理。 XRD的结晶峰在确认已整合到壳聚糖纤维中。实验和模拟均证实了Cs，并通过葡萄糖环的糖苷键C-O-C结合成为一个复合单元Cs-TiO。 FTIR和模拟的振动光谱分别显示在978和110处的能带分裂，这表明Cs与所述键之间的积分和分子间吸引力。 SEM显示分散在壳聚糖纤维上的100-200nm尺寸的珠。与纯Cs相比，Cs-TiO的分子模型显示出优化的几何构型，具有更大的偶极矩，更高的负能量，更低的电离势能和更窄的HOMO-LUMO能隙。指示具有增强的结构和反应性的所得复合材料。在更长的等离子处理时间下合成的复合材料显示出更好的沉积物分散性，表现出更高的抗菌能力，抑制区的直径约为11.5毫米。

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