Design and fabrication of bimodal structures are essential for successful development of advanced air filters with ultralow airflow resistance. To realize this goal, simplified processing procedures are necessary for meeting the practical needs. Here, a bimodal protein fabric with high-performance air filtration, and effectively lowered airflow resistance is reported. The various functional groups of proteins provide versatile interactions with pollutants. By utilizing a novel and cost-effective “cross-axial” configuration with an optimized condition (75° of contacting angle between solution nozzle and cospinning solvent nozzle), the diffusion in Taylor cone is in situ controlled, which results in the successful production of bimodal protein fabric. The bimodal protein fabric (16.7 g/m² areal density) is demonstrated to show excellent filtration performance for removing particulate matter (PM) pollutants and only causes 17.1 Pa air pressure drop. The study of multilayered protein fabric air filters shows a further improvement in filtration performance of removing 97% of PM_0.3 and 99% of PM_2.5 with a low airflow resistance (34.9 Pa). More importantly, the four-layered bimodal protein fabric shows an exceptional long-term performance and maintains a high removal efficiency in the humid environment. This study presents an effective and viable strategy for fabricating bimodal fibrous materials for advanced air filtration.

中文翻译：

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一种双峰蛋白织物，可通过原位扩散实现高性能空气过滤。

双峰结构的设计和制造对于成功开发具有超低气流阻力的高级空气过滤器至关重要。为了实现这个目标，简化的处理程序对于满足实际需求是必要的。在此，报道了一种具有高效空气过滤性能并有效降低气流阻力的双峰蛋白织物。蛋白质的各种功能基团提供了与污染物的多种相互作用。通过在最佳条件下（溶液喷嘴和共纺溶剂喷嘴之间的接触角为75°）利用新颖且具有成本效益的“横轴”配置，泰勒锥中的扩散得到原位控制，从而成功生产了双峰蛋白织物。双峰蛋白织物（16.7 g / m ²单位面积密度）显示出优异的过滤性能，可去除颗粒物（PM）污染物，并且仅造成17.1 Pa气压下降。对多层蛋白织物空气过滤器的研究表明，在过滤性能方面有了进一步的改进，去除了97％的PM _0.3和99％的PM _2.5，并且气流阻力低（34.9 Pa）。更重要的是，四层双峰蛋白织物显示出优异的长期性能，并在潮湿环境中保持高去除效率。这项研究提出了一种用于高级空气过滤的双峰纤维材料的有效可行的策略。