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异常高的图形晶体化纤维素纳米晶体的异常高的图形晶体化

Jung-Eun Lee¹, Woo Cheol Jeon², Yea Eun Kim¹

¹Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.

ACS applied materials & interfaces

|May 11, 2024

概括

纤维素纳米晶体 (CNC) 的喷雾冷干燥 (SFD) 显示出不同的碳化行为. 无形CNC形成硬碳,而晶体CNC产生软碳,影响储能应用.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
聚合物化学聚合物化学

背景情况:

纤维素纳米晶 (CNCs) 是丰富的,可持续的材料,具有储能和纳米复合材料的潜力.
纤维素通常在碳化后产生硬碳,但在CNC中观察到异常的石墨化.
了解CNC碳化过程中的结构发展对于量身定制的材料特性至关重要.

研究的目的:

为了研究纤维素纳米晶体 (CNC) 的无形和晶体相的碳化行为.
用喷雾冷干燥 (SFD) 和随后的碳化来区分CNC的结构演变.
为了将CNC相位结构与得到的碳材料特性 (硬碳与软碳) 相关联.

主要方法:

使用喷雾冷干燥 (SFD) 来处理纤维素纳米晶体 (CNC).
在经过SFD处理的CNC上进行了碳化研究.
使用高分辨率传输电子显微镜 (HR-TEM) 进行形态分析.
进行了反应分子动力学 (RMD) 模拟,以研究结构发展.

主要成果:

形态分析显示,无形CNC相形成硬碳,而晶体CNC相形成软碳.
反应分子动力学 (RMD) 模拟表明无形纤维素中的碳环结构较少,与硬碳形成一致.
晶体纤维素相表现出更高的密度和热稳定性,促进了高度石墨的软碳结构的形成.

结论:

纤维素纳米晶体的相结构 (无形与晶体) 显著决定了碳化后形成的碳的类型.
采用SFD方法,可以区分来自CNC的硬碳和软碳.
这一发现为控制生物质前体的碳结构提供了洞察力,用于储能等先进应用.

关键词:

纤维素纳米晶体 (CNCs) 的使用硬碳是一种硬的碳.一个前体的前体.反应性分子动力学 (RMD)软碳是一种软的碳.喷雾冷干燥的使用方法

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