Zhang Meiling, Fan Yinan, Wang Ni, Gao Hongguo, Zhang Lei, Zhao Yanjiao, Liu Lifang
College of Textiles, Donghua University, Shanghai 201620, China.
Shandong Technology Innovation Center of Ecological Textile, Shangdong 256623, China.
Carbohydr Polym. 2024 Jan 15;324:121470. doi: 10.1016/j.carbpol.2023.121470. Epub 2023 Oct 7.
Personal thermal management (PTM) textiles for outdoor activities have become increasingly important for addressing energy consumption and thermal comfortable. Cellulose nanofiber (CNF) aerogels have emerged as promising candidates for PTM due to the eco-friendliness, lightweight, and low thermal conductivity. However, the singular insulation capability may not be sufficient to accommodate the diverse and harsh outdoor conditions. Herein, we carbonized CNF-based aerogel to fabricate anisotropic carbon aerogels, and then incorporated silver nanowires (AgNWs) upon onside to fabricate the dual-function AgNWs/carbon aerogel. The resulting material inherits high porosity (99.3 %), high surface area (503.2 m/g), low density (7.08 mg/cm), and low thermal conductivity (18.2 mW·m·k in the axial direction) to act as an ideal thermal insulator. The AgNWs coating side demonstrates low IR-emissivity (17.6 % at 7-14 μm) and the carbon aerogel side has high solar absorptivity (91.97 %). Moreover, the AgNWs/carbon aerogel shows Joule heating performance (∆T = 44.5 °C within 3 min at 5 V). The multi-heating modes enabling self-adaptable thermal comfortable under various harsh environment. Additionally, the material's breathability, permeability, and electromagnetic shielding characteristics also make it suitable candidate for advanced wearable textiles for PTM.
用于户外活动的个人热管理（PTM）纺织品对于解决能源消耗和热舒适性问题变得越来越重要。纤维素纳米纤维（CNF）气凝胶由于其环保、轻质和低导热性，已成为PTM的有前途的候选材料。然而，单一的隔热能力可能不足以适应多样且恶劣的户外条件。在此，我们对基于CNF的气凝胶进行碳化以制备各向异性碳气凝胶，然后在一侧引入银纳米线（AgNWs）以制备具有双功能的AgNWs/碳气凝胶。所得材料具有高孔隙率（99.3%）、高比表面积（503.2 m²/g）、低密度（7.08 mg/cm³）和低导热率（轴向为18.2 mW·m⁻¹·K⁻¹），可作为理想的隔热材料。AgNWs涂层侧具有低红外发射率（7 - 14μm时为17.6%），而碳气凝胶侧具有高太阳能吸收率（91.97%）。此外，AgNWs/碳气凝胶具有焦耳热性能（5V下3分钟内ΔT = 44.5°C）。多种加热模式能够在各种恶劣环境下实现自适应热舒适性。此外，该材料的透气性、渗透性和电磁屏蔽特性也使其成为用于PTM的先进可穿戴纺织品的合适候选材料。
