True density of nanoporous carbon fabricated from rice husk

The accurate estimation of true density is a fundamental problem for nanoporous carbon (NPC) materials because of helium adsorption. In this study, we developed a method for measuring the true density of NPC fabricated from rice husks based on a gas constant-volume expansion method. The proposed method considers helium adsorption on NPCs. The obtained results indicated that NPC fabricated from rice husk with a 2986 m(2)/g specific surface area has a true density of 2.095 g/cm(3) as determined by the proposed method. In contrast, using the commercial helium-substituted method, the true density was measured as 2.437 g/cm(3). The average standard deviation values using the proposed method were 0.015-0.027, whereas those using the commercial helium-substituted method were 0.024-0.138. These results indicated that accurate determination of the true density of NPCs was accomplished by the proposed method.

Automated summary

A method for measuring the true density of nanoporous carbon (NPC) fabricated from rice husks based on a gas constant-volume expansion method was developed in this study. Results showed that this method provided accurate determination of true density with higher stability, particularly in NPC materials with higher specific surface area.