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绿色合成纳米材料增强有机相变材料的热运动行为:模型拟合方法

B Kalidasan¹, A K Pandey², Belqasem Aljafari³

¹Research Centre for Nano-Materials and Energy Technology (RCNMET), School of Engineering and Technology, Sunway University, No. 5, Jalan Universiti, Bandar Sunway, Petaling Jaya, 47500 Selangor Darul Ehsan, Malaysia.

Journal of environmental management

|October 27, 2023

概括

来自Prosopis Juliflora (PJ) 废物的绿色合成纳米粒子增强有机相变材料 (PCM). 这种环保的方法提高了导热率,并提供了对PCM处置动力学的见解.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
可再生能源可再生能源是可再生能源.

背景情况:

有机相变材料 (PCM) 中常规纳米颗粒是昂贵的,并带来毒性风险.
废弃的有机PCM的处置带来了环境挑战.
需要可持续和具有成本效益的方法来增强PCM特性.

研究的目的:

开发环保的纳米复合材料PCM,使用来自Prosopis Juliflora (PJ) 农业废物的绿色合成纳米颗粒.
评估这些纳米粒子对有机PCM的热性能的影响.
分析开发的纳米复合材料PCM的降解动力学和热力学特征,以确保安全处置.

主要方法:

来自Prosopis Juliflora (PJ) 杂草的纳米粒子的绿色合成.
通过将PJ纳米颗粒纳入有机PCM (Tm = 35-40°C,Hm = 145 J/g) 来制造纳米复合PCM.
使用短暂热线方法测量导热率.
在各种加热速率 (5-20°C/分钟) 下进行热重量测量分析 (TGA).
科茨和雷德费恩方法用于降解的动力学和热力学分析.

主要成果:

用0.8重%的PJ纳米粒子实现了63.8%的导热率 (0.282到0.462W/m·K) 的增加.
PJ纳米颗粒的均分布弥合了热网络,增强了热传输.
分解的活化能量 (Ea) 减少了7.7% (从370.82到342.54 kJ/mol-1),表明了催化分解.
确定了热力学参数 (ΔH, ΔG, ΔS),提供了有关降解机制的见解.

结论:

绿色合成的PJ纳米粒子提供了一种可持续和有效的方法来增强有机PCM的热性能.
开发的纳米复合材料PCM显示了更好的导热性和稳定性.
热运动分析为优化PCM及其纳米复合材料的处置和潜在热解提供了关键数据.

关键词:

毛衣和红的方法.处置处理处理阶段变化材料的变相材料.可持续的纳米材料热分解动力学热分解动力学热能储存是热能储存的方法之一.

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