超声波预处理对杉木和尾叶巨桉理化性质及干燥性能的影响

IF 9.7 1区 化学 Q1 ACOUSTICS
Jing Qian , Taoyu Han , Taorong Cheng , Pengfei Xia , Zekai Sun , Chunping Dai , Jiejie Sun
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引用次数: 0

摘要

超声处理在提高木材干燥效率和透气性方面具有很大的潜力,但其对不同树种的协调结构和干燥响应的影响尚不清楚。研究了超声波(320 W, 40 kHz)处理1 ~ 5 h对杉木和尾叶大桉理化性质、孔隙结构、透气性和干燥行为的影响。结果表明,超声预处理没有改变纤维素的结晶度类型,但降低了纤维素的结晶度和游离羟基含量,增加了纤维素的质量损失、微纤维角和吸湿尺寸稳定性。随着处理时间的延长,细胞双壁厚度先减小后趋于稳定,邵氏硬度在三段均呈下降趋势。SEM和MIP分析表明,超声逐渐破坏坑膜,增加宏孔和介孔的比例,增加总孔隙体积和孔隙度,从而提高气体渗透性。处理1 ~ 4 h的效果最显著,而过度处理(5 h)会导致结构崩溃或孔隙关闭。在径向和切向上,杉木的渗透率分别提高了63%和60%,大叶松的渗透率分别提高了42%和33%。干燥时间缩短,干燥速率和扩散系数增大,体积收缩率降低。处理2 h和4 h后,干燥率分别提高了10%和13%左右。然而,与自由水相比,束缚水对超声波刺激的反应更弱。这些研究结果为优化超声参数以改善速生人工林木材的干燥性能和透气性改性提供了理论和实践依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of ultrasonic pretreatment on physicochemical properties and drying behavior of Cunninghamia lanceolata and Eucalyptus grandis × urophylla
Ultrasonic treatment offers promising potential for improving wood drying efficiency and permeability, yet its effects on the coordinated structural and drying responses of different species remain underexplored. This study assessed the impact of 1–5 h ultrasonic treatments (320 W, 40 kHz) on the physicochemical properties, pore structure, permeability, and drying behavior of Cunninghamia lanceolata and Eucalyptus grandis × urophylla. Results showed that ultrasonic pretreatment did not alter cellulose crystallinity type but reduced crystallinity and free hydroxyl content, while increasing mass loss, microfibril angle, and hygroscopic dimensional stability. With increasing treatment time, cell double wall thickness initially decreased and then stabilized, and Shore hardness declined across all three sections. SEM and MIP analyses revealed that ultrasound gradually disrupted pit membranes, increased the proportion of macro- and mesopores, total pore volume, and porosity, thereby enhancing gas permeability. Treatments of 1–4 h showed the most significant improvements, while excessive treatment (5 h) led to structural collapse or pore closure. Permeability was enhanced by up to about 63 % and 60 % in radial and tangential directions of C. lanceolata, and by about 42 % and 33 % in E. grandis, respectively. Drying time was shortened, and drying rate and diffusion coefficient were increased, while volumetric shrinkage was reduced. Drying rates were raised by about 10 % and 13 % after 2 h (C. lanceolata) and 4 h (E. grandis) treatments, respectively. However, bound water was found to be less responsive to ultrasonic stimulation than free water. These findings provide a theoretical and practical basis for optimizing ultrasonic parameters to improve the drying performance and permeability modification of fast-growing plantation wood.
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来源期刊
Ultrasonics Sonochemistry
Ultrasonics Sonochemistry 化学-化学综合
CiteScore
15.80
自引率
11.90%
发文量
361
审稿时长
59 days
期刊介绍: Ultrasonics Sonochemistry stands as a premier international journal dedicated to the publication of high-quality research articles primarily focusing on chemical reactions and reactors induced by ultrasonic waves, known as sonochemistry. Beyond chemical reactions, the journal also welcomes contributions related to cavitation-induced events and processing, including sonoluminescence, and the transformation of materials on chemical, physical, and biological levels. Since its inception in 1994, Ultrasonics Sonochemistry has consistently maintained a top ranking in the "Acoustics" category, reflecting its esteemed reputation in the field. The journal publishes exceptional papers covering various areas of ultrasonics and sonochemistry. Its contributions are highly regarded by both academia and industry stakeholders, demonstrating its relevance and impact in advancing research and innovation.
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