Bannov Alexander G, Ukhina Arina V, Maksimovskii Evgenii A, Prosanov Igor Yu, Shestakov Artyom A, Lapekin Nikita I, Lazarenko Nikita S, Kurmashov Pavel B, Popov Maksim V
Department of Chemistry and Chemical Engineering, Faculty of Mechanical Engineering, Novosibirsk State Technical University, 630092 Novosibirsk, Russia.
Institute of Chemistry of Solid State and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, 630092 Novosibirsk, Russia.
Materials (Basel). 2021 Dec 13;14(24):7687. doi: 10.3390/ma14247687.
Highly porous expanded graphite was synthesized by the programmable heating technique using heating with a constant rate (20 °C/min) from room temperature to 400-700 °C. The samples obtained were analyzed by scanning electron microscopy, energy-dispersive spectroscopy, low-temperature nitrogen adsorption, X-ray photoelectron spectroscopy, Raman spectroscopy, thermogravimetry, and differential scanning calorimetry. A comparison between programmable heating and thermal shock as methods of producing expanded graphite showed efficiency of the first one at a temperature 400 °C, and the surface area reached 699 and 184 m/g, respectively. The proposed technique made it possible to obtain a relatively higher yield of expanded graphite (78-90%) from intercalated graphite. The experiments showed the advantages of programmable heating in terms of its flexibility and the possibility to manage the textural properties, yield, disorder degree, and bulk density of expanded graphite.
采用程序升温技术，以恒定速率（20℃/min）从室温加热至400 - 700℃，合成了高孔隙率膨胀石墨。对所得样品进行了扫描电子显微镜、能谱分析、低温氮吸附、X射线光电子能谱、拉曼光谱、热重分析和差示扫描量热法分析。对程序升温法和热冲击法制备膨胀石墨的方法进行比较，结果表明在400℃时前者效率更高，其表面积分别达到699和184 m²/g。所提出的技术能够从插层石墨中获得相对较高产率的膨胀石墨（78 - 90%）。实验表明，程序升温在灵活性以及控制膨胀石墨的结构性质、产率、无序度和堆积密度方面具有优势。
