Leite Liliana, Pais Vânia, Silva Cristina, Boticas Inês, Bessa João, Cunha Fernando, Relvas Cátia, Ferreira Noel, Fangueiro Raul
Fibrenamics-Institute of Innovation on Fiber-Based Materials and Composites, University of Minho, 4800-058 Guimarães, Portugal.
Centre for Textile Science and Technology (2C2T), University of Minho, 4800-058 Guimarães, Portugal.
Materials (Basel). 2023 Apr 7;16(8):2938. doi: 10.3390/ma16082938.
Chemical protective clothing (CPC) has become mandatory when performing various tasks to ensure user protection and prevent chemicals from contacting the skin and causing severe injuries. In addition to protection, there is a need to develop a simple mechanism that can be attached to CPC and be capable of detecting and alerting the user to the presence of harmful chemical agents. In this study, a double-sensor strategy was investigated, using six different pH indicators stamped on cotton and polyester knits to detect acidic and alkaline substances, both liquid and gaseous. Functionalized knits underwent microscopic characterization, air permeability and contact angle evaluation. All samples exhibited hydrophobic behavior (contact angle > 90°) and air permeability values above 2400 L/min/cm/bar, with the best condition demonstrating a contact angle of 123° and an air permeability of 2412.5 L/min/cm/bar when the sensor methyl orange and bromocresol purple (MO:BP) was stamped on polyester. The performed tests proved the functionality of the sensors and showed a visible response of all knits when contacting with different chemicals (acids and bases). Polyester functionalized with MO:BP showed the greatest potential, due to its preeminent color change. Herein, the fiber coating process was optimized, enabling the industrial application of the sensors via a stamping method, an alternative to other time- and resource-consuming techniques.
在执行各种任务时，化学防护服（CPC）已成为确保用户安全、防止化学品接触皮肤并造成严重伤害的必备装备。除防护功能外，还需要开发一种简单的机制，该机制可附着于化学防护服上，能够检测有害化学制剂的存在并向用户发出警报。在本研究中，研究了一种双传感器策略，使用六种不同的pH指示剂印在棉和聚酯针织物上来检测液态和气态的酸性和碱性物质。对功能化针织物进行了微观表征、透气性和接触角评估。所有样品均表现出疏水行为（接触角>90°），透气率值高于2400 L/min/cm/bar，最佳条件下，当传感器甲基橙和溴甲酚紫（MO:BP）印在聚酯上时，接触角为123°，透气率为2412.5 L/min/cm/bar。所进行的测试证明了传感器的功能，并显示所有针织物在与不同化学品（酸和碱）接触时都有明显的响应。用MO:BP功能化的聚酯因其出色的颜色变化而显示出最大的潜力。在此，对纤维涂层工艺进行了优化，通过压印法实现了传感器的工业应用，这是一种替代其他耗时且耗费资源的技术的方法。
