Organic phase change materials are sensitive to temperature calling thermo-responsive materials having ability of thermal energy storage/release in a warm/cold medium through latent heat, indicating proper potential for better thermal energy management. Nonetheless, leakage during melting and undesirable thermal conductivity are considered as two major disadvantages. Herein, for the first time, a simple one-step route is suggested for preparing novel shape-stable nano Fe₃O₄/fatty acids/PET composite can be utilized in thermal energy saving and management applications. This is based on simultaneous embedment of fatty acids as phase change materials into polyester (PET) fibers as supporting material and formation of iron oxide nanoparticles. The present approach not only obviates two stated drawbacks but also it is free from separately forming or providing nanoparticles and utilizing micro/nano encapsulation or electrospinning which may contain toxic chemicals. It is further conducted in one-single step preferring in the view of both economic and environmental aspects. The composites indicated promising phase temperature intervals of 36.3–54.1 and 26.9–35.5 °C for melting and freezing with latent heats of 40.3–59.7 and 40.1–58.2 J/g, respectively. The embedment of iron oxide nanoparticles resulted in thermal conductivity elevation around 44.5–85.8%. The prepared samples displayed good thermal endurance and reliability after 100 thermal treatments. They also had no leakage even after 120 min at 75 °C revealed their appropriate leakage-proof property in real usages. Overall, the paper introduces an affordable one-step mode for fabricating shape-stable nano-enhanced composite with proper thermal features for practical thermal energy management and saving applications.

有机相变材料对温度敏感，热响应材料具有通过潜热在热/冷介质中存储/释放热能的能力，这表明有更好的热能管理潜力。然而，熔融期间的泄漏和不希望的导热率被认为是两个主要缺点。在此，首次提出了一种简单的一步法制备新型形状稳定的纳米Fe ₃ O _{4的方法。}/脂肪酸/ PET复合材料可用于热能节省和管理应用中。这是基于将脂肪酸作为相变材料同时嵌入作为支撑材料的聚酯（PET）纤维中，并形成氧化铁纳米颗粒。本方法不仅消除了两个所述的缺点，而且没有单独形成或提供纳米颗粒并利用可能包含有毒化学物质的微/纳米封装或电纺丝的优点。考虑到经济和环境方面，优选一步进行。复合材料显示出有希望的相温度区间为36.3-54.1和26.9-35.5°C，用于熔化和冷冻，潜热分别为40.3-59.7和40.1-58.2 J / g。氧化铁纳米粒子的包埋导致热导率升高约44.5-88.5％。制备的样品经过100次热处理后显示出良好的耐热性和可靠性。即使在75°C下120分钟后，它们也没有泄漏，表明它们在实际使用中具有适当的防漏性能。总体而言，本文介绍了一种经济实惠的单步模式，用于制造形状稳定的纳米增强复合材料，该复合材料具有适当的热特性，可用于实际的热能管理和节能应用。