Mechanism of the Formation of Nano-Pore Structure in Wood Charcoal

The physical properties and functions of carbon materials are assumed to be原始的ultra-structure and. surface chemical structure. Nano-pore structure formed as the aggregation ofcarbon-stacking planes in the wood cell walls，are strongly expected to the functions of carbon materials such as adsorption ordesorption. The visualia.tion of The nano-pore结构和evaluation on its formation processare highly required to develop the new functions of wood charcoal.The.observatory studies bytransmission electron microscope demonstrated that the ultrastructure of wood charcoal in theinitial stage of carbonization was consisted of the mixture of amorphous，porous shell-like and well-aligned carbon-stacking planes. The port -structure of wood charcoalcarbonized at 600 C was shown to represent the micro pores below mm mainly consisting of theamorphous carbon planes On the other hand, the amorphousporous shell-like and well-aligned carbon-stacking planes have developed in wood charcoal carbonizedat 700 to 800℃.These results showed that the effects of the cell wall structure and chemicalcomposition on the carbonization process of wood charcoal.应该evaluated for the development直接监测的效果。the effectiveness of the direct observation of these carbon materialstransmission electron microscope was demonstrated for the design of the new functional materials。In the process of the. study，the new research fields have been developed such as carbonization of wood charcoal at hightemperature by Al-triisopropoxide，Si/C composite materials from wood charcoal by a pulse sintering method and graphitization ofbiomass carbon。

The physical properties and functions of carbon materials are assumed to be originated from the ultra-structure and. surface chemical structure. Nano-pore structure formed as the aggregation of carbon-stacking planes in the wood cell walls, are strongly expected to contribute to the functions of carbon materials such as adsorption or desorption. The visualia.tion of the nano-pore structure and the evaluation on its formation process are highly required to develop the new functions of wood charcoal.The.observatory studies by transmission electron microscope demonstrated that the ultra-structure of wood charcoal in the initial stage of carbonization was consisted of the mixture of amorphous, porous shell-like and well-aligned carbon-stacking planes. The pore-structure of wood charcoal carbonized at 600ーC was shown to represent the micro pores below mm mainly consisting of the amorphous carbon planes. On the other hand, the amorphous, porous shell-like and well-aligned carbon-stacking planes have developed in wood charcoal carbonized at 700 to 800℃.These results showed that the effects of the cell wall structure and chemical composition on the carbonization process of wood charcoal. should be evaluated for the development of the efficient utilization of these carbon materials. The effectiveness of the direct observation by transmission electron microscope was demonstrated for the design of the new functional materials. In the process of the. study, the new research fields have been developed such as carbonization of wood charcoal at high temperature by Al-triisopropoxide, Si/C composite materials from wood charcoal by a pulse sintering method and graphitization of biomass carbon.