Study on Leaching Mechanism of Micro/Nano Particles from Cunninghamia lanceolata Wood in NaOH Liquor

In order to overcome the above-mentioned negative effects, the extractives of the fresh Cunninghamia lanceolata shavings, which were obtained by using both the sorbitic-extracting approaches, were analyzed by ZETA and SIZER to find out the leaching rule of nano particles in Chinese-fir wood. The results are as follows: (1) The extraction mass arrived at the maximum value when NaOH concentration is about 18.5. The micro/nano particles in Cunninghamia lanceolata shavings would be discharged sufficiently in the NaOH solution with the increaing of extracting time.(2) The diameter the micro/nano particles of wood extractives and hemicellulose is chiefly between 24.4-1720 nm according to volume fraction when NaOH concentration is <10%. And the diameter the micro/nano particles of wood extractives and hemicellulose is chiefly between <342 nm according to volume fraction when NaOH concentration is <10%. Micro/nano particles in the diameter of 24.4-91.3 nm, 342-1720 nm, 0-24.4 nm is the most at the extracting time of 3 h, 16 h, 24 h, respectively. (3)The diameter the micro/nano particles of wood extractives and hemicellulose is chiefly between 24.4-1720 nm according to number fraction.Micro/nano particles in the diameter of 91.3-342 nm, 91.3-342 nm, 91.3-1720 nm is the most at the extracting time of 3 h, 16 h, 24 h, respectively.