赤桉木材微/纳米粒子的溶出规律

Leaching Laws of Micro/Nano Particles from Eucalyptus camaldulensis Wood

采用单因素试验法，分析赤桉木材缈纳米粒子在索氏抽提、超声抽提、冷冻抽提、激光等离子抽提中的溶出规律．结果表明：在索氏抽提过程中，溶出量随赤桉木片抽提时间的延长而增大；在抽提1．5，3．5和4．0h时溶出粒子中有数量极少的粒径分别为4150～5560nm、4150～5560nm、1110～6440nm的粒子，其体积分数分别为0．3％，0．3％和2．6％，但足以对木材渗透产生屏障、对制浆产生树脂障碍；超声、冷冻预处理、激光等离子在抽提中均能降低赤桉木材彬纳米粒子的集聚程度，而且还能提高缈纳米粒子的溶出量，其中激光等离子抽提效果最好．

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.