Semi-quantitative analysis of the structural evolution of mesophase pitch-based carbon foams by Raman and FTIR spectroscopy

IF 5.7 3区 材料科学 Q2 Materials Science New Carbon Materials Pub Date : 2024-08-01 DOI:10.1016/S1872-5805(24)60867-X
Yue Liu, Sheng-kai Chang, Zhan-peng Su, Zu-jian Huang, Ji Qin, Jian-xiao Yang
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Abstract

Graphitized carbon foams (GFms) were prepared using mesophase pitch (MP) as a raw material by foaming (450 °C), pre-oxidation (320 °C), carbonization (1 000 °C) and graphitization (2 800 °C). The differences in structure and properties of GFms prepared from different MP precursors pretreated by ball milling or liquid phase extraction were investigated and compared, and semi-quantitative calculations were conducted on the Raman and FTIR spectra of samples at each preparation stage. Semi-quantitative spectroscopic analysis provided detailed information on the structure and chemical composition changes of the MP and GFm derived from it. Combined with microscopic observations, the change from precursor to GFm was analyzed. The results showed that ball milling concentrated the distribution of aromatic molecules in the pitch, which contributed to uniform foaming to give a GFm with a uniform pore distribution and good properties. Liquid phase extraction helped remove light components while retaining large aromatics to form graphitic planes with the largest average size during post-treatment to produce a GFm with the highest degree of graphitization and the fewest open pores, giving the best compression resistance (2.47 MPa), the highest thermal conductivity (64.47 W/(m·K)) and the lowest electrical resistance (13.02 μΩ·m). Characterization combining semi-quantitative spectroscopic analysis with microscopic observations allowed us to control the preparation of the MP-derived GFms.

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利用拉曼光谱和傅立叶变换红外光谱对介相沥青基碳泡沫的结构演变进行半定量分析
以介相沥青(MP)为原料,通过发泡(450 °C)、预氧化(320 °C)、碳化(1 000 °C)和石墨化(2 800 °C)制备了石墨化碳泡沫(GFms)。通过球磨或液相萃取预处理不同 MP 前体制备的 GFms 的结构和性质差异进行了研究和比较,并对各制备阶段样品的拉曼光谱和傅立叶变换红外光谱进行了半定量计算。半定量光谱分析提供了有关 MP 及其衍生 GFm 结构和化学成分变化的详细信息。结合显微镜观察,分析了从前驱体到 GFm 的变化。结果表明,球磨集中了沥青中芳香分子的分布,有助于均匀发泡,从而得到孔隙分布均匀、性能良好的 GFm。液相萃取有助于去除轻组分,同时保留大芳烃,从而在后处理过程中形成平均尺寸最大的石墨化平面,生产出石墨化程度最高、开放孔隙最少的 GFm,使其具有最佳的抗压性(2.47 兆帕)、最高的热导率(64.47 W/(m-K))和最低的电阻(13.02 μΩ-m)。半定量光谱分析与显微观察相结合的表征方法使我们能够控制 MP 衍生 GFms 的制备。
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来源期刊
New Carbon Materials
New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.10
自引率
8.80%
发文量
3245
审稿时长
5.5 months
期刊介绍: New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.
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