Exfoliation process of graphite via intercalation compounds with sulfuric acid |
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Institution: | 1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;2. Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement, Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing 100081, China |
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Abstract: | Exfoliation process of graphite via its residue compound from intercalation compound with sulfuric acid was discussed by measuring exfoliation volume and pore sizes among and inside their worm-like particles. Exfoliation process was found to divide into three steps, below 650, 650–800 °C and above 800 °C. Below 650 °C, exfoliation of graphite flakes to form worm-like particles occurred rapidly and so exfoliation volume increased. Above 650 °C, increase in exfoliation volume, i.e. decrease in bulk density, became more rapid, but the growth of pores inside the particles was not so much pronounced. Above 800 °C, the increasing rate in exfoliation volume seemed to become slow, change in bulk density looking small, but pores inside the particles grew more. Exfoliated graphite prepared at 1000 °C had the exfoliation volume of about 0.15 m3/kg (bulk density of about 7 kg/m3), which is composed of large spaces with the cross-sectional area of more than 8000 μm2 and worm-like particles containing ellipsoidal pores with averaged cross-sectional area of about 320 μm2 and sizes of about 31×11 μm2. |
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