de Almeida Daniela S, Scacchetti Fabio A P, Santos Roberta, Aguiar Monica Lopes, Beal Alexandra, Rudke Anderson P, Santana Marcos Henrique de Souza, Lisboa Ana Maria Valério, Bezerra Fabricio M, Martins Leila D
Federal University of São Carlos, São Carlos, SP, Brazil.
Federal University of Technology - Paraná, Londrina, PR, Brazil.
Environ Technol. 2023 Feb;44(5):686-694. doi: 10.1080/09593330.2021.1982020. Epub 2021 Sep 26.
Due to the recent coronavirus-2019 pandemic, several studies have emerged looking for new materials, especially with biocidal characteristics. Thus, the present research investigates the antibacterial properties of biodegradable cellulose acetate (CA) / cetylpyridinium bromide (CPB) electrospun nanofibers, their aerosol filtration, and the possible use as a filter media of surgical face masks. Then, samples of these nanofibers were produced over a nonwoven substrate, using different volumes of polymeric solution during the electrospinning process. The evaluation of the antibacterial properties of the nanofibers was performed for and using quantitative methods. The aerosol filtration performance was evaluated in these samples for NaCl nanoparticles (from 7-300 nm) and with 8 mL min of air flow rate. The results show that the single use of the surfactant has antibacterial properties from a concentration of 39 µg mL of solution. The nanofibers presented a reduction of 100% for both bacteria. Air filtration tests showed 126.03 and 207.73 Pa cm² of pressure drops and 63 and 77% of aerosol filtration efficiency (FE) for samples with 0.13 and 0.15 mL, respectively. Regarding the nanofiber produced with 0.35 mL, the value obtained was 115.13 ± 33.64 Pa cm and 3.15% of particle penetration. These breathability values are higher than those required for the surgical face mask standard, indicating that improvements in the porosity and thickness are necessary to meet the Brazilian requirements. However, the nanofibers could be applied as filter media for indoor air conditioning systems due to their FE and biocidal properties.
由于最近的2019冠状病毒病大流行，出现了几项寻找新材料的研究，特别是具有杀菌特性的材料。因此，本研究调查了可生物降解的醋酸纤维素（CA）/十六烷基溴化吡啶（CPB）电纺纳米纤维的抗菌性能、它们的气溶胶过滤性能以及作为外科口罩过滤介质的可能用途。然后，在静电纺丝过程中使用不同体积的聚合物溶液，在非织造基材上制备了这些纳米纤维的样品。使用定量方法对纳米纤维的抗菌性能进行了评估。在这些样品中，以8 mL/min的空气流速对7-300 nm的氯化钠纳米颗粒的气溶胶过滤性能进行了评估。结果表明，仅使用表面活性剂时，溶液浓度为39 μg/mL就具有抗菌性能。纳米纤维对两种细菌的抑菌率均为100%。空气过滤测试表明，对于分别含有0.13 mL和0.15 mL样品的压降分别为126.03和207.73 Pa·cm²，气溶胶过滤效率（FE）分别为63%和77%。对于含有0.35 mL制备的纳米纤维，得到的值为115.13±33.64 Pa·cm和颗粒穿透率为3.15%。这些透气率值高于外科口罩标准要求的值，表明需要改善孔隙率和厚度以满足巴西的要求。然而，由于其过滤效率和杀菌性能，纳米纤维可作为室内空调系统的过滤介质。
