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Synthesis of Ag/CNT hybrid nanoparticles and fabrication of their Nylon-6 polymer nanocomposite fibers for antimicrobial applications

机译：Ag / CNT杂化纳米粒子的合成及其抗菌用Nylon-6聚合物纳米复合纤维的制备

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Ag-coated CNTs hybrid nanoparticles (Ag/CNTs) were prepared by ultrasonic irradiation of dimethylformamide (DMF) and silver (I) acetate precursors in the presence of CNTs. The morphology of Ag/CNTs was characterized using x-ray diffraction and transmission electron microscopy (TEM) techniques. The Nylon-6 powder and 1 wt% Ag/CNTs mixture was dispersed uniformly using a noncontact spinning technique. The dried mixture was melted in a single screw extrusion machine and then extruded through an orifice. Extruded filaments were later stretched and stabilized by sequentially passing them through a set of tension adjusters and a secondary heater. The Nylon-6/Ag/CNT hybrid polymer nanocomposite (HPNC) fibers, which were of similar to 80 mu m size, were tested for their tensile properties. The failure stress and modulus of the extruded HPNC fibers (doped with 1% Ag/CNTs) was about 72.19% and 342.62% higher than the neat extruded Nylon-6 fiber, respectively. DSC results indicated an increase in the thermal stability and crystallization for HPNC fibers. The antibacterial activity of the Ag-coated CNTs, commercial Ag, neat Nylon-6 and plain CNTs were evaluated. Ag-coated CNTs at 25 mu g demonstrated good antimicrobial activity against four common bacterial pathogens as tested by the Kirby-Bauer assay. The mean diameters of the zones of inhibition were 27.9 +/- 6.72 mm, 19.4 +/- 3.64 mm, 21.9 +/- 4.33 mm, and 24.1 +/- 4.14 mm, respectively, for Staphylococcus aureus, Streptococcus pyogenes, Escherichia coli and Salmonella enterica serovar Typhimurium. By comparison, those obtained using the broad spectrum antibiotic amoxicillin-clavulanic acid were 37.7 +/- 2.13 mm, 28.6 +/- 4.27 mm, 22.6 +/- 1.27 mm, and 27.0 +/- 1.41 mm, respectively, for the same strains. The zones of inhibition obtained for Nylon-6 Ag-coated CNT powder at 25 mu g were also high, ranging from 15.2 to 25.3 mm in contrast to commercial silver or neat Nylon-6, which did not inhibit the bacterial strains tested. Further, the Nylon-6 nanocomposite fibers infused with Ag/CNTs inhibited bacterial growth by 11-20%. Our results suggest that nylon nanocomposite fibers infused with Ag-coated CNTs have significant antimicrobial activity.
机译：通过在CNT的存在下对二甲基甲酰胺（DMF）和醋酸银（I）前驱体进行超声辐照来制备涂有Ag的CNTs杂化纳米颗粒（Ag / CNT）。 Ag / CNT的形貌使用X射线衍射和透射电子显微镜（TEM）技术进行了表征。使用非接触纺丝技术将Nylon-6粉末和1 wt％Ag / CNTs混合物均匀分散。将干燥的混合物在单螺杆挤出机中熔融，然后通过孔挤出。挤出的长丝随后通过依次通过一组张力调节器和辅助加热器进行拉伸和稳定。测试了类似于80微米尺寸的Nylon-6 / Ag / CNT杂化聚合物纳米复合材料（HPNC）纤维的拉伸性能。挤出的HPNC纤维（掺有1％Ag / CNT）的破坏应力和模量分别比纯挤出的Nylon-6纤维高约72.19％和342.62％。 DSC结果表明HPNC纤维的热稳定性和结晶度增加。评估了涂有银的碳纳米管，商用银，纯尼龙6和普通碳纳米管的抗菌活性。如Kirby-Bauer分析所示，25μg的Ag包被的CNTs对四种常见细菌病原体表现出良好的抗菌活性。对于金黄色葡萄球菌，化脓性链球菌，大肠埃希氏菌和沙门氏菌血清型鼠伤寒沙门氏菌。相比之下，对于相同的菌株，使用广谱抗生素阿莫西林-克拉维酸获得的那些分别为37.7 +/- 2.13 mm，28.6 +/- 4.27 mm，22.6 +/- 1.27 mm和27.0 +/- 1.41 mm 。尼龙6 Ag涂覆的CNT粉在25μg时获得的抑制区域也很高，与商用银或纯尼龙6相比，抑制范围为15.2至25.3 mm，后者不抑制所测试的细菌菌株。此外，注入Ag / CNT的Nylon-6纳米复合纤维可将细菌生长抑制11-20％。我们的结果表明，掺有Ag涂层的CNT的尼龙纳米复合纤维具有显着的抗菌活性。

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