Holzforschung最新文献_第5页

Effect of temperature on the dynamic wettability of Chinese fir wood: integrative consideration of surface spreading, penetration and evaporation 温度对中国杉木动态润湿性的影响：表面铺展、渗透和蒸发的综合考虑

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-12-30 DOI: 10.1515/hf-2023-0096

Xianfu Xiao, Kaiwen Chen, Hui Peng, Jianxiong Lyu, Tianyi Zhan

{"title":"Effect of temperature on the dynamic wettability of Chinese fir wood: integrative consideration of surface spreading, penetration and evaporation","authors":"Xianfu Xiao, Kaiwen Chen, Hui Peng, Jianxiong Lyu, Tianyi Zhan","doi":"10.1515/hf-2023-0096","DOIUrl":"https://doi.org/10.1515/hf-2023-0096","url":null,"abstract":"Wood wettability, the process of liquid interaction with wood surfaces, is influenced by wood surface chemistry, structure, ambient conditions, and temperature. Understanding how temperature impacts wood wettability is crucial for high-temperature manufacturing processes. In this study, the sessile drop method was employed to explore the dynamic wettability of Chinese fir wood using three different liquids (water, glycerol and polyvinyl acetate (PVAc)) across a range of temperatures (25, 40, 60 and 80 °C). By considering spreading, penetration and evaporation, we revealed that the dynamic wettability of Chinese fir was strongly dependent on temperature and the type of liquid. Temperature elevation enhances wettability, leading to reduced contact angles and increased penetration ratios. Water exhibited the highest wettability, followed by glycerol, with PVAc being the least wetting agent. Notably, after 180 s of wetting at 80 °C, the measured contact angles were 0° for water, 45° for glycerol, and 120° for PVAc. When accounting for evaporation, the penetration of water decreased from 57 % to 47 % (25 °C) and 100 % to 62 % (80 °C). The activation energies for the penetration of water and PVAc into Chinese fir exhibited variations, with values of 35.3 and 158.3 kJ/mol, respectively. These comprehensive wetting results, covering spreading, penetration and evaporation, provide valuable insights into wood–water and wood–adhesive interactions, particularly when exposed to high-temperature conditions.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"26 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139066646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of tannin acid impregnated pretreatment on dimensional stability and chemical composition of heat-treated Chinese fir 单宁酸浸渍预处理对热处理杉木尺寸稳定性和化学成分的影响

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-12-30 DOI: 10.1515/hf-2023-0081

Yuxin Zhao, Luxi He, Jiayi Kang, Jingjing Gao, Guochen Huo, Kai Xu, Tinghuan Wang, Zhengbin He, Zhenyu Wang, Songlin Yi

{"title":"Effects of tannin acid impregnated pretreatment on dimensional stability and chemical composition of heat-treated Chinese fir","authors":"Yuxin Zhao, Luxi He, Jiayi Kang, Jingjing Gao, Guochen Huo, Kai Xu, Tinghuan Wang, Zhengbin He, Zhenyu Wang, Songlin Yi","doi":"10.1515/hf-2023-0081","DOIUrl":"https://doi.org/10.1515/hf-2023-0081","url":null,"abstract":"Thermal treatment is an effective method for improving the dimensional stability of wood; however, it typically requires high temperatures. To achieve low-temperature heat treatment, this study employed wood samples impregnated with 10 % tannin acid (TA) and examined their changes in dimensional stability and chemical components after heat treatment at various initial moisture content levels. The results revealed that the TA-10 %-HT group exhibited enhanced dimensional stability. Specifically, both the tangential and radial moisture swelling decreased by 21.7 % and 11.8 %, respectively. FTIR and XRD analysis indicated that the presence of tannin acid catalytically facilitated the degradation of hemicellulose. Moreover, an increase in moisture content resulted in the ionization of TA, amplifying acidity and further affecting cellulose degradation. TGA demonstrated that TA impacted the thermal stability of heat-treated materials by lowering the initial decomposition temperature of wood components and increasing the residual weight of wood. Overall, pretreatment with TA impregnation and moisture content significantly improved the dimensional stability of Chinese fir wood and altered its chemical composition. This approach holds considerable potential for enhancing wood properties through a low-energy consumption method during the heat treatment process, expanding the practical application of wood.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"14 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139072146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analyzing the structure of bamboo culms using computer vision and mechanical simulation 利用计算机视觉和机械模拟分析竹秆结构

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-12-27 DOI: 10.1515/hf-2023-0093

Fukuan Dai, Yuxuan Chen, Wenfu Zhang, Tuhua Zhong, Genlin Tian, Hankun Wang

{"title":"Analyzing the structure of bamboo culms using computer vision and mechanical simulation","authors":"Fukuan Dai, Yuxuan Chen, Wenfu Zhang, Tuhua Zhong, Genlin Tian, Hankun Wang","doi":"10.1515/hf-2023-0093","DOIUrl":"https://doi.org/10.1515/hf-2023-0093","url":null,"abstract":"Bamboo culm is a natural material characterized by a graded structure of vascular bundles in the radial direction and a regular distribution of bamboo nodes in the axial direction. To investigate the adaptation of bamboo culm structure to its natural environment, the bamboo culm structure was analyzed using a vascular bundle identification model, complemented by mechanical simulations. The results showed a certain pattern in the macroscopic dimensional characteristics of bamboo from the base to the top: the outer diameter decreased linearly; the internode length initially increased before decreasing; the length-to-diameter ratio gradually increased; and the wall-to-cavity ratio initially decreased before increasing. In response to external forces, bamboo exhibited strong stability, which was attributed to the thin and hollow wall as well as parabolic distribution of bamboo nodes. Along the axial direction, vascular bundle numbers linearly decreased, while the ratio of fiber sheath tissue and the distribution frequency of vascular bundles increased from the base to the top. In the radial direction, the length and area of vascular bundles tended to increase before decreasing, while the width tended to increase, leading to a decreasing length-to-width ratio. Overall, the radial variation pattern of vascular bundles showed nonsignificant variations at different heights.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"18 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of the bark of Protium tenuifolium Engl. from the Amazonian biome as a source of natural antioxidants 作为天然抗氧化剂来源的亚马逊生物群落中的葳蕤（Protium tenuifolium Engl.）树皮的特性研究

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-12-26 DOI: 10.1515/hf-2023-0039

Laise de Jesus dos Santos, Elesandra da Silva Araujo, Mário Sérgio Lorenço, Bianca Bueno Rosário, Sabrina Benmuyal Vieira, Agust Sales, Marco Antonio Siviero, Luiz Eduardo de Lima Melo, Graciene da Silva Mota, Gabriela Aguiar Campolina, Fabio Akira Mori

{"title":"Characterization of the bark of Protium tenuifolium Engl. from the Amazonian biome as a source of natural antioxidants","authors":"Laise de Jesus dos Santos, Elesandra da Silva Araujo, Mário Sérgio Lorenço, Bianca Bueno Rosário, Sabrina Benmuyal Vieira, Agust Sales, Marco Antonio Siviero, Luiz Eduardo de Lima Melo, Graciene da Silva Mota, Gabriela Aguiar Campolina, Fabio Akira Mori","doi":"10.1515/hf-2023-0039","DOIUrl":"https://doi.org/10.1515/hf-2023-0039","url":null,"abstract":"The bark anatomy was analysed, as was the overall chemical composition (extractives, lignin, suberin, ash and polysaccharides), and a quantitative elemental analysis was performed of the bark and two tannin extracts (extracted with water only and with a mixture of water and Na2SO3). The phenolic composition and antioxidant activity of the bark extracts were quantified. The results indicated that the bark is composed of conductive phloem, nonconductive phloem, rhytidome, crystals and secretory cells. The average chemical composition was 15.9 % extractives, 35.3 % total lignin, 1.9 % suberin, 15.4 % ash and 31.5 % polysaccharides. The condensed tannin yield in the extract obtained with water alone was 5.1 %, and that in the treatment with water and Na2SO3 was 8.1 %. The ethanol-water extract had a high phenolic content (112.6 mg GAE g−1 extract). The bark extract showed strong antioxidant activity, reaching 83.5 % inhibition of DPPH free radicals, which was higher than the value of 75.0 % for the commercial antioxidant BHT at the same concentration. These results demonstrate that Protium tenuifolium is a potential natural Amazonian source of phenolic compounds and antioxidants and can be used for medicinal purposes and the production of various sustainable products, such as cosmetics.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"8 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139051083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The impact of site on tree form, wood properties, and lumber quality of plantation-grown Pinus patula 地点对人工种植松树的树形、木材特性和木材质量的影响

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-12-26 DOI: 10.1515/hf-2023-0075

Jaco-Pierre van der Merwe, Martin Bacher, Sechaba Madiope, Thandekile Ncongwane, Robert Ngomane, Olwethu Spogter, Hilton Kuisis, Jaco Potgieter, Oscar Tait, Charlie Clarke, Julie Cool, Stavros Avramidis, Simon Ellis, Shawn D. Mansfield

{"title":"The impact of site on tree form, wood properties, and lumber quality of plantation-grown Pinus patula","authors":"Jaco-Pierre van der Merwe, Martin Bacher, Sechaba Madiope, Thandekile Ncongwane, Robert Ngomane, Olwethu Spogter, Hilton Kuisis, Jaco Potgieter, Oscar Tait, Charlie Clarke, Julie Cool, Stavros Avramidis, Simon Ellis, Shawn D. Mansfield","doi":"10.1515/hf-2023-0075","DOIUrl":"https://doi.org/10.1515/hf-2023-0075","url":null,"abstract":"South Africa is a water scarce country with minimal natural forests. Plantation forest species such as the Mexican tropical hard pine, Pinus patula Schiede & Deppe ex Schltdl. & Cham., was introduced into the country to satisfy local fibre demand. Today, the majority of pine plantations in South Africa are found in the Mpumalanga province. The province has diverse growing conditions in relation to climate and soil properties. Sample plots were established in even-aged P. patula plantations and stratified according to soil parent material and altitude. Growing conditions of each sample plot were characterised according to climate and soil properties. A total of 540 sample trees were measured for height, diameter, density, and latewood content. The sample trees were harvested to produce 2690 logs. The logs were milled, and the resultant lumber was graded according to density, dynamic modulus of elasticity, and modulus of rupture. Annual maximum temperature had the most significant impact on tree growth, while rainfall correlated with wood density and latewood content of standing trees. However, annual maximum temperature and tree height had a negative relationship with the recovered lumber properties and dimensional stability. Spring rainfall appeared to be the most important factor influencing lumber twist and this was possibly due to the associated larger juvenile core present in the trees.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"13 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reviewer acknowledgement Holzforschung volume 77 (2023) 审稿人致谢 Holzforschung 第 77 卷（2023 年）

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-12-22 DOI: 10.1515/hf-2023-0122

引用次数: 0

Wood modification with trimethoxyphenylsilane via supercritical carbon dioxide for enhanced weathering resistance 通过超临界二氧化碳对木材进行三甲氧基苯基硅烷改性以增强耐候性

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-12-13 DOI: 10.1515/hf-2023-0089

Juliette Triquet, Olivier Renard, Pierre Piluso

引用次数: 0

The feasibility and properties of wood used as filler in artificial turf to reduce environment pollution 研究了木材作为人造草坪填料减少环境污染的可行性和性能

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-11-27 DOI: 10.1515/hf-2023-0047

Luyang Wang, Ke Shi, Chunxia He

引用次数: 0

Impact of a conditioning step during the treatment of wood with melamine-formaldehyde resin on dimensional stabilisation 三聚氰胺甲醛树脂处理木材过程中一个调节步骤对尺寸稳定性的影响

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-11-24 DOI: 10.1515/hf-2023-0084

Md. Tipu Sultan, Daniela Altgen, Muhammad Awais, Lauri Rautkari, Michael Altgen

{"title":"Impact of a conditioning step during the treatment of wood with melamine-formaldehyde resin on dimensional stabilisation","authors":"Md. Tipu Sultan, Daniela Altgen, Muhammad Awais, Lauri Rautkari, Michael Altgen","doi":"10.1515/hf-2023-0084","DOIUrl":"https://doi.org/10.1515/hf-2023-0084","url":null,"abstract":"The dimensional stabilisation of wood using thermosetting resins relies on the resin uptake into the cell walls. This study tested if a conditioning step after the impregnation and before the final heat-curing enhances the cell wall uptake to improve dimensional stabilisation without increasing the chemical consumption. Small blocks of Scots pine sapwood were vacuum-impregnated with an aqueous melamine formaldehyde solution and conditioned at 33, 70, or 95 % RH for up to 1 week before drying and curing the blocks at 103 °C. However, the conditioning step decreased the cell wall bulking and the moisture exclusion effect compared to the immediate heat curing of the impregnated samples. Analyses of the resin-treated samples by scanning electron microscopy, IR spectroscopy and confocal Raman microspectroscopy provided evidence of wood hydrolysis and polycondensation of the resin within the cell lumen during the conditioning step. Hydrolysis and removal of wood constituents may have counterbalanced the cell wall bulking of the resin. Polycondensation of the resin in the lumen increased its molecule size, which could have hindered the cell wall diffusion of the resin.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"33 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138530952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of molecule weight on the emulsifying properties of dodecenyl succinic anhydride modified glucuronoxylans 分子量对十二烷基丁二酸酐改性葡萄糖醛酸聚糖乳化性能的影响

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-11-24 DOI: 10.1515/hf-2023-0077

Zhenhua Hu, Xiaotong Fan, Zhouyang Xiang, Luliang Wang, Shengdan Wang, Yushen Liu

引用次数: 0