Physics Department, Faculty of Science, Fayoum University, El Fayoum, 63514, Egypt.
Department of Botany, Faculty of Agriculture, Fayoum University, El Fayoum, 63514, Egypt.
Sci Rep. 2023 Jul 31;13(1):12358. doi: 10.1038/s41598-023-39056-y.
The present work aims to improve the uses of the carboxymethyl cellulose-polyacrylamide (Na-CMC-PAAm) blend for energy storage, optoelectronic applications, biological control, and plant disease management. Nano-sized materials (α-FeO nanoplates (NP), CuO NP, and GO nanosheets (NS), were synthesized and incorporated into the blend. The phase purity and morphologies of the used fillers were studied by XRD and HR-TEM. The interactions and complexation between the nano-fillers and the blend chains were investigated using XRD and FTIR spectra. The chemical composition and surface morphology of the nanocomposites were studied using EDS and FE-SEM analysis. UV-vis-NIR spectra revealed that the blend shows about 95% transmittance, reduced by 10-30% after doping. The absorption and refractive indices, as well as the optical gaps of the blend, were greatly affected by the doping. The dielectric constant and loss depend on the type of filler and the applied frequency. The maximum ac conductivity of the blend at 303 K and 4.0 MHz is 21.5 × 10 S/m and increased to 23.5 × 10 S/m after doping with CuO NP. The thermal stability, activation energy, stress-strain curves, and tensile strength are dependent on the filler type. All nanocomposite solutions except the blend exhibited a wide range of antifungal properties against pre- and post-harvest phytopathogenic fungi. Aspergillus niger among the examined fungi showed high sensitivity to the tested nanocomposite solutions. Furthermore, the CuO/blend nanocomposite had the highest antifungal activity against all tested fungi. Based on that, we suggest the use of CuO/blend and GO/blend nanocomposites to control and combat pre- and post-harvest fungal plant diseases.
本工作旨在提高羧甲基纤维素-聚丙烯酰胺（Na-CMC-PAAm）共混物在储能、光电应用、生物控制和植物病害管理方面的用途。合成了纳米尺寸的材料（α-FeO 纳米板（NP）、CuO NP 和 GO 纳米片（NS），并将其掺入共混物中。使用 XRD 和高分辨率 TEM 研究了所用填料的物相纯度和形貌。使用 XRD 和 FTIR 光谱研究了纳米填料与共混物链之间的相互作用和络合。使用 EDS 和 FE-SEM 分析研究了纳米复合材料的化学组成和表面形貌。UV-vis-NIR 光谱表明，共混物的透光率约为 95%，掺杂后降低了 10-30%。掺杂后，共混物的吸收和折射率以及光学带隙都受到了很大的影响。介电常数和损耗取决于填料的类型和施加的频率。在 303 K 和 4.0 MHz 下，共混物的最大交流电导率为 21.5×10-5 S/m，掺杂 CuO NP 后增加到 23.5×10-5 S/m。热稳定性、活化能、应力-应变曲线和拉伸强度取决于填料的类型。除共混物外，所有纳米复合材料溶液均对采前和产后植物病原真菌表现出广泛的抗真菌性能。在所检查的真菌中，黑曲霉对测试的纳米复合材料溶液表现出高敏感性。此外，CuO/共混物纳米复合材料对所有测试真菌表现出最高的抗真菌活性。基于此，我们建议使用 CuO/共混物和 GO/共混物纳米复合材料来控制和防治采前和产后真菌植物病害。
