Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences, Umeå, SE-901 83, Sweden.
Cellulose Technology, Department of Sustainable Materials and Packaging, MoRe Research AB, RISE Research Institutes of Sweden, Hörneborgsvägen 10, Domsjö, Örnsköldsvik, 892 50, Sweden.
Sci Rep. 2024 Oct 26;14(1):25548. doi: 10.1038/s41598-024-75716-3.
The transition to a bioeconomy is attracting the use of wood powders for developing bio-based chemicals, fuels, and products to replace fossil-based products. Wood powder-based products depend on the properties and quality of wood powders. Despite many studies on their morphological and physical properties, studies on micromorphology and extractive micro-distribution are scarce. Here we investigated the effect of milling type and wood quality in terms of moisture content on microstructural changes and native extractive distribution in wood powders. The findings showed that non-dried and dried multi-blade shaft mill (MBSM) powders had smooth surfaces and less undamaged cellulosic fibre walls, and extractives were located in the cell lumen. Non-dried and dried hammer mill powders had a rough surface and fibres with structural deformations in their cell walls (e.g. dislocations). Extractives were redistributed on the particle surface as well as dispersed in the cell lumen for both types of hammer mill powders. In a word, the powders obtained from MBSM technology are more native in structure. The findings of the study can have implications for downstream processes.
向生物经济的转变吸引了人们使用木粉来开发生物基化学品、燃料和产品，以替代基于化石的产品。基于木粉的产品取决于木粉的特性和质量。尽管已经有许多关于其形态和物理性质的研究，但对微观形态和萃取物微观分布的研究却很少。在这里，我们研究了磨浆类型和木材质量（水分含量）对木粉微结构变化和天然抽出物分布的影响。研究结果表明，未经干燥和干燥的多刀片轴磨（MBSM）木粉具有光滑的表面和较少未损坏的纤维素纤维壁，并且抽出物位于细胞腔中。未经干燥和干燥的锤磨木粉具有粗糙的表面，纤维细胞壁发生结构变形（例如位错）。两种类型的锤磨木粉的表面都重新分布了抽出物，而且抽出物也分散在细胞腔中。总之，MBSM 技术获得的木粉在结构上更具天然性。该研究结果可能对下游工艺有影响。
