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Scientia Silvae Sinicae ›› 2008, Vol. 44 ›› Issue (7): 62-67.doi: 10.11707/j.1001-7488.20080711

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Supercritical Fluid CO2 Drying Process of Wood SiO2 Alcogel Composites

Qiu Jian1.2,Li Jian1,Liu Yixing1   

  1. （1. Key Lab. of BioBased Material Science and Technology of Ministry of Education Northeast Forestry University Harbin 150040；2.Faculty of Wood Science and Decoration Engineering，Southwest Forestry University Kunming 650224）
  • Received:2006-10-06 Revised:1900-01-01 Online:2008-07-25 Published:2008-07-25

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Abstract:

The supercritical fluid CO2(SFC) dry process of wood SiO2 alcogel composites was researched in this paper. The results show that for the wood surround the SiO2 alcogel supercritical drying process of the dynamic and static press is 25 MPa， the dynamic press time is 180 min， the dynamic and static dry temperature is 50 ℃. The SiO2 aerogel of net micro structure was observed that coalescence with wood and keep the wood porous structure very well. According to transmission electron microscope observing， the silica aerogels were coherent， nanosized porous solids that mean diameter of particles is about 13～300 nm. Wood\|SiO2 aerogel composites have specially bulking ratio. For different structure of basswood and alder，the bulking ratio have greatly diversity in basswood and alder, alder's bulking ratio is half of basswood.

Key words: supercritical fluid CO2 （SFC）, wood SiO2 aerogel composites, wood supercritical drying, nanostructure