Abstract:

In order to overcome the negative effects, the extractives of the fresh E. camaldulensis shavings, which were obtained by using the sorbitic-, freezing-, laser plasma- and In this paper, micro/nano particles of Eucalyptus camaldulensis （E. camaldulensis） wood were extracted by means of Sorbitic-, freezing-, laser plasma- and ultrasonic-extraction approaches, and the corresponding leaching laws were investigated via slngle-factor tests. The results show that, during the Sorbitic-extraction process, the extraction rate of the micro/nano particles increases with the extraction time, and that some particles in the diameter ranges of 4150 - 5 560, 4150 - 5 560 and 1 110 - 6 440 nm are respectively leached after having been extracted for 1.5, 3.5 and 4. Oh. The volume fractions of these particles, respectively only 0. 3%, 0. 3% and 2. 6%, are enough to give obstructive effects on the permeability and the pulping. Moreover, it is indicated that ultrasonic-, freezing- and laser plasma-extraction approaches can not only reduce the clustering of leached micro/nano par： ticles but also enhance the leaching, especially the laser plasma-extraction approach.

Key words: Eucalyptus camaldulensis, micro/nano particle, leaching, ultrasonic, freezing, laser plasma