Using low-field NMR and MRI to characterize water status and distribution in modified wood during water absorption
Using low-field NMR and MRI to characterize water status and distribution in modified wood during water absorption
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使用低场核磁共振和磁共振成像来表征改性木材在吸水过程中的水分状态和分布
DOI：
10.1515/hf-2018-0293
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发表时间：
2019-07
期刊：
影响因子：
2.4
通讯作者：
Jinzhen Cao
中科院分区：
文献类型：
--
作者：
Wang Wang;Jinyu Chen;Jinzhen Cao
摘要本文研究了两种木材改性方法的协同效应，旨在为提高木材疏水性提供参考。火炬松（火炬松）的修改使用两种变体的相同的处理程序：在第一种情况下，石蜡乳液（PWE）浸渍，然后热改性（TM）;在第二种情况下，顺序颠倒，和TM之后PWE浸渍。然后将处理过的样品浸入蒸馏水中1、6、24、48或96 h。低场核磁共振（LF-NMR）和核磁共振成像（MRI）被用来评估不同的水成分的浓度，以及水的分布。结果表明，联合处理比单独处理表现出更好的性能，特别是当PWE浸渍后TM。此外，通过使用MRI，我们表征了两种方法在协同关系中的作用，这表明PWE浸渍通过降低自由水吸收来增加木材疏水性，而TM通过结合水吸收来执行相同的功能。此外，石蜡渗透到TM引起的新形成的裂缝中，这也有助于PWE浸渍和TM之间的协同机制。
Abstract In this study, synergism between two wood modification methods was investigated with the aim of providing insights into improving wood hydrophobicity. Loblolly pine (Pinus taeda) was modified using two variants of the same treatment procedure: in the first case, paraffin wax emulsion (PWE) impregnation was followed by thermal modification (TM); in the second case, the order was reversed, and TM was followed by PWE impregnation. The treated samples were then immersed in distilled water for 1, 6, 24, 48 or 96 h. Low-field nuclear magnetic resonance (LF-NMR) and nuclear magnetic resonance imaging (MRI) were employed to evaluate the concentration of different water components, as well as the water distribution. The results indicated that the combined treatment showed much better performance than either treatment individually, particularly when PWE impregnation was followed by TM. Moreover, through the use of MRI, we characterized the role of both methods in the synergistic relationship, which showed that the PWE impregnation increased the wood hydrophobicity through decreasing free water absorption, while the TM performed the same function through bound water absorption. In addition, paraffin wax penetrated the newly formed cracks caused by TM, which also contributed to the synergistic mechanism between PWE impregnation and TM.
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影响因子：
2.4
作者：
Wang Wang-Wang;Yiheng Huang;Jinzhen Cao;Yuan Zhu
通讯作者：
Wang Wang-Wang;Yiheng Huang;Jinzhen Cao;Yuan Zhu
DOI：
10.1007/s001070050287
发表时间：
1998-05-01
期刊：
HOLZ ALS ROH-UND WERKSTOFF
影响因子：
--
作者：
Tjeerdsma, BF;Boonstra, M;Militz, H
通讯作者：
Militz, H
影响因子：
3.4
作者：
J. V. Houts;Siqun Wang;Huiping Shi;H. Pan;G. Kabalka
通讯作者：
J. V. Houts;Siqun Wang;Huiping Shi;H. Pan;G. Kabalka
影响因子：
2.4
作者：
Wang Wang-Wang;Cong Chen;Jinzhen Cao;Yuan Zhu
通讯作者：
Wang Wang-Wang;Cong Chen;Jinzhen Cao;Yuan Zhu
影响因子：
3.4
作者：
M. Zauer;A. Pfriem;A. Wagenführ
通讯作者：
M. Zauer;A. Pfriem;A. Wagenführ