• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Wood and Fiber Science >Moisture in untreated, acetylated, and furfurylated Norway spruce monitored during drying below fiber saturation using time domain NMR.
【24h】

Moisture in untreated, acetylated, and furfurylated Norway spruce monitored during drying below fiber saturation using time domain NMR.

机译：使用时域NMR在纤维饱和度以下干燥期间，对未经处理，乙酰化和糠基化的挪威云杉中的水分进行监测。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Using time domain NMR, the moisture in Norway spruce (Picea abies (L.) Karst.) sapwood subjected to four different treatments (never-dried, dried and remoistened, acetylated, and furfurylated) was studied during drying at 40pC, at sample average moisture contents above fiber saturation. Spin-spin relaxation time distributions were derived from CPMG relaxation curves using multiexponential fitting (CONTIN), and the resulting water populations were assigned according to the literature and their behavior during drying. It was found that both acetylation and furfurylation increased the average spin-spin relaxation time of the lumen water in earlywood tracheids from about 80-100 ms to 200 and 300 ms, respectively. The average spin-spin relaxation time of the cell wall water was reduced from about 1.4 to 0.65 ms by furfurylation, while acetylation had less effect on this water. The relaxation times of both the earlywood lumen water and of the cell wall water were slightly longer for the never-dried samples than for the dried and remoistened samples.
机译：使用时域NMR，在40pC干燥条件下，对挪威云杉（Picea abies（L.）Karst。）边材进行了四种不同处理（从未干燥，干燥和再润湿，乙酰化和糠基化）的水分进行了研究，得出样品的平均值水分含量高于纤维饱和度。使用多指数拟合（CONTIN）从CPMG弛豫曲线得出自旋-自旋弛豫时间分布，并根据文献及其在干燥过程中的行为分配所得的水种群。已经发现，乙酰化和糠基化均使早材气管中管腔水的平均自旋-自旋-自旋弛豫时间分别从约80-100ms增加至200和300ms。通过糠醛化作用，细胞壁水的平均自旋-自旋弛豫时间从约1.4毫秒减少到0.65毫秒，而乙酰化对该水的影响较小。从未干燥样品的早材木腔水和细胞壁水的松弛时间都比干燥和润湿的样品稍长。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号