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Updated: Jan 24, 2026

Preparation of Carbon Nanosheets at Room Temperature
Published on: March 8, 2016
Improving the Micropore Capacity of Activated Carbon by Preparation under a High Magnetic Field of 10 T
Atom Hamasaki1, Ayumi Furuse2, Yuya Sekinuma2
1Faculty of Science, Shinshu University, Matsumoto, Nagano, 390-8621, Japan. atom@shinshu-u.ac.jp.
Abstract:
The influence of an applied magnetic field on the formation of carbon materials from coal tar pitch is investigated. Under an applied magnetic field, crystallites in a mesophase resembling liquid crystals are magnetically oriented during the carbonization process. Compared with that under a nonmagnetic field, carbonized coal tar pitch under a strong magnetic field of 10 T, generated by a superconducting magnet, has a highly oriented structure of carbon crystallites. The orientation of samples prepared under 2 T, which can easily be supplied by an electromagnet, was insufficient. Activation by potassium hydroxide is effective for affording a precursor for activated carbon. The activated carbon obtained under a strong magnetic field has a unique adsorption ability, which arises from its increase in relative surface area and total pore volume compared with those of an activated carbon sample prepared from a precursor produced under zero magnetic field. The precursor carbonized under a magnetic field of 10 T contains a larger number of crystallites than that carbonized under a 0-T magnetic field, which leads to high-performance activated carbon.
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