Performance of Carbonized Sugi Wood and Bark for Humidity Control

概要

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Sugi (Japanese cedar, Cryptomeria japonica D. Don) wood or bark were heated at 500 - 900 ℃ for 3h to investigate the effect of treatment temperature on the surface properties and the humidity control capacity of carbonized materials. The specific surface area of micropore (pore radius = 0.64 - 1.0 nm) and mesopore (> 1.0 nm) were estimated by the adsorption isotherm of nitrogen gas at 77K. The humidity control tests were carried out in a sealed batch system at a temperature range of 15 - 25 ℃ for 3 - 24h cycles. The initial relative humidity (RH) at 20 ℃ was 65%. The micropore surface area of the carbonized woods varied depending on the treatment temperature. These increased significantly from 0 m^2/g to 441 m^2/g when the temperature increased from 500 ℃ to 900 ℃. In contrast, the mesopore surface area was almost constant regardless of the treatment temperature, being 39 - 79 m^2/g. The maximum performance of humidity control was obtained with the wood or bark carbonized at 600 ℃ in 3h and 6h cycles. The change in RH for 24h cycle at the sample of 3.0 mg/cm^3 was kept within a range of 3%. In addition, the ability for 3 to 24 hour-cycle humidity control was equivalent to that of 1 to 3/5 of a commercial silica gel used in museums. Carbonized wood and bark prepared at any temperature did not differ from un-carbonized wood in the humidity control capacity at 24h cycle.
社団法人日本材料学会の論文
2002-03-15