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对于低温热能储存的n-nonane + n-decane的相平衡:对奇偶偶效应的洞察
Maria C M Sequeira1, Timur Nikitin2, Fernando J P Caetano3,4
1Departamento de Engenharia Química, Centro de Química Estrutural, Institute of Molecular Sciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.
International journal of thermophysics
|March 10, 2025
概括
本研究详细介绍了n-nonane和n-decane混合物的固体-液体相图,这些混合物对于低温热能存储至关重要. 在n-C9+n-C10系统中,呈现出一张围学相图,证实了基混合物中奇偶效应.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
背景情况:
- 在低温热能储存 (TES) 应用中,n-烯是必不可少的.
- 了解二进制n-系统中的相位平衡对于开发有效的相变材料 (PCM) 至关重要.
- 之前的研究表明,相位图的依赖性取决于n-alkane链中的奇数或偶数的碳原子.
研究的目的:
- 确定二进制n-nonane (n-C9) 和n-decane (n-C10) 系统的固体-液体相图.
- 调查这个n-C9+n-C10二进制系统作为低温TES的PCM的潜力.
- 为了解二进制n-基混合物的相平衡行为中的奇偶效应做出贡献.
主要方法:
- 差分扫描热量计 (DSC) 用于相位过渡温度和热量.
- 热阶段显微镜 (HSM) 用于视觉确认相位过渡.
- 低温拉曼光谱用于补充相位分析.
主要成果:
- 在n-C9+n-C10二进制系统中,呈现出一个周周的固体-液体相图.
- 周周学温度被确定为222.41 K.
- 发现周围构成大约为x_nonane = 0.60.
- 观察到的固体-固体相位过渡也被描述.
结论:
- 这种n-C9+n-C10二进制系统适用于低温TES应用的PCM.
- 这些发现证实了围观系统的假设,受奇偶碳素数效应的影响.
- 这项研究提供了关于n-C9+n-C10系统的固体-液体相平衡的新数据,以前没有在文献中报道过.
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