Holzforschung最新文献_第9页

Emulsions of cellulose oxalate from Norway spruce (Picea abies) bark and dissolving pulp 挪威云杉（Picea abies）树皮草酸纤维素乳液和溶解浆

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-05-31 DOI: 10.1515/hf-2022-0191

Isabella Kwan, B. Rietzler, M. Ek

{"title":"Emulsions of cellulose oxalate from Norway spruce (Picea abies) bark and dissolving pulp","authors":"Isabella Kwan, B. Rietzler, M. Ek","doi":"10.1515/hf-2022-0191","DOIUrl":"https://doi.org/10.1515/hf-2022-0191","url":null,"abstract":"Abstract Tree bark is normally a side-stream product but by an integrated bark biorefinery approach, valuable compounds may be recovered and used to replace fossil-based products. Norway spruce bark was extracted to obtain cellulose, which was chemically treated to produce cellulose oxalate (COX) which was homogenized to yield nanocellulose. The nanocellulose was used to produce Pickering emulsions with almond oil and hexadecane as organic phases. COX from dissolving pulp was used to study the effect of various raw materials on the emulsifying properties. The COX samples of bark and dissolving pulp contained a significant amount of hemicelluloses, which affected the viscosity results. The emulsion properties were affected by the organic phases and the aspect ratio. Emulsions using hexadecane were more stable than the emulsions using almond oil. Since the aspect ratio of bark was lower than that of the dissolving pulp, the emulsifying properties of the COX dissolving pulp was better. It has been shown that nanocellulose from cellulose oxalate of both spruce bark and dissolving pulp is a promising substitute for petroleum-based emulsifiers and surfactants. By utilizing bark, value-added products can be produced which may be economically beneficial for various industries in the future and their aim for climate-neutral products.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"554 - 565"},"PeriodicalIF":2.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46131446","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: 1

Vanillin/silica microencapsulation for wood preservation 香兰素/二氧化硅微胶囊用于木材防腐

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-05-31 DOI: 10.1515/hf-2022-0187

Li Yan, Zeyao Yan, Jiang Chen, Zhang-jing Chen, Yafang Lei

{"title":"Vanillin/silica microencapsulation for wood preservation","authors":"Li Yan, Zeyao Yan, Jiang Chen, Zhang-jing Chen, Yafang Lei","doi":"10.1515/hf-2022-0187","DOIUrl":"https://doi.org/10.1515/hf-2022-0187","url":null,"abstract":"Abstract Vanillin is an antifungal and environmentally friendly compound. In this study, vanillin and silica microcapsules (VSM) were microencapsulated using the sol-gel method and then impregnated into wood. Scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDXA) and transmission electron microscopy (TEM) were used to characterize the morphological structure and distribution of VSM in wood. Fourier transform infrared spectroscopy (FTIR) was used to study the intermolecular interactions between VSM and wood. The antifungal performance of the VSM-treated wood was evaluated. The study revealed that VSM had good sustained-release performance and decay resistance. Mass losses of VSM-treated wood after leaching and exposure to Trametes versicolor (L.) Quel. and Gloephyllum trabeum (Pers.) Murrill decreased from mass losses of 20.8 % and 15.9 % of the control group to 9.2 % and 6.4 %, respectively. VSM treatment disrupted the mycelium of T. versicolor and G. trabeum, inhibited their respiratory metabolism, and the ligninase-laccase enzyme activity of T. versicolor. Meanwhile, MOR and MOE of VSM-treated wood were 96.7 MPa and 12.3 GPa which were 28.8 % and 11.5 % higher than the control group, respectively.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"527 - 540"},"PeriodicalIF":2.4,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42579201","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

Water-vapour sorption of welded bond-line of European beech and Scots pine 欧洲山毛榉和苏格兰松焊接结合线的水蒸气吸附

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-05-26 DOI: 10.1515/hf-2022-0012

M. Vaziri, Christopher H. Dreimol, Lars Abrahamsson, P. Niemz, D. Sandberg

{"title":"Water-vapour sorption of welded bond-line of European beech and Scots pine","authors":"M. Vaziri, Christopher H. Dreimol, Lars Abrahamsson, P. Niemz, D. Sandberg","doi":"10.1515/hf-2022-0012","DOIUrl":"https://doi.org/10.1515/hf-2022-0012","url":null,"abstract":"Abstract The wood–water interactions of welded bond-lines of European beech (Fagus sylvatica L.) and Scots pine (Pinus sylvestris L.) were in this paper studied for the first time with dynamic vapour sorption equipment. The aim of this study was to characterize the water sorption in the welded bond-line and to define to which extent it deviates from water sorption of the unwelded wood. The objective was to provide deepened knowledge about water sorption of the welded bond-line, which could be used to improve the moisture resistance of welded wood in the future. The welded wood generally had lower equilibrium moisture contents than the unwelded wood. The welded bond-lines of beech and pine showed greater hysteresis than the unwelded wood from 0 to 55 % relative humidity. All specimens showed faster adsorption than desorption. However, the welded wood showed slower adsorption but faster desorption than unwelded wood. The time to complete half of the fractional change in moisture content (E(t) = 0.5) increased as the moisture content increased. The adsorption diffusion coefficients of beech and welded beech were higher than those of pine and welded pine up to 50 % and 40 % RH, respectively. In desorption, pine had a higher diffusion coefficient than beech in the whole range of 85–0 % RH. Analogously, welded pine had a higher diffusion coefficient than welded beech in the range of 85–5 % RH. In contrast to the desorption, the welded wood always had lower adsorption diffusion coefficients than the corresponding unwelded wood. The diffusion coefficients showed irregular patterns in some ranges of the RH. Therefore, it was hard to make a clear conclusion about the water-sorption behaviour of the specimens based on the defined diffusion coefficients.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"500 - 514"},"PeriodicalIF":2.4,"publicationDate":"2023-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42101203","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: 1

3D wood-based evaporator for highly efficient solar steam generation 用于高效太阳能蒸汽生成的3D木质蒸发器

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-05-25 DOI: 10.1515/hf-2022-0185

Meihua Xie, Ping Zhang, Yangbing Jin, Zhe Wang, C. Jin

{"title":"3D wood-based evaporator for highly efficient solar steam generation","authors":"Meihua Xie, Ping Zhang, Yangbing Jin, Zhe Wang, C. Jin","doi":"10.1515/hf-2022-0185","DOIUrl":"https://doi.org/10.1515/hf-2022-0185","url":null,"abstract":"Abstract Interfacial solar-driven steam generation is one of the most promising techniques used to produce clean water. However, achieving rapid water evaporation using solar steam generation devices is challenging because of their two-dimensional (2D) planar structures and confined evaporation areas. The three-dimensional (3D) structural design of evaporation devices improves water evaporation rates, thereby enhancing solar-driven steam generation. This study developed a 3D wood-based evaporator through 3D structure shaping and the flexible treatment of wood that involved coating photothermal materials with tannic acid. Because of the ampliative evaporation area and outstanding absorption, the water evaporation rate of the prepared 3D wood-based evaporator was as high as 2.5 kg m−2 h−1, and the efficiency of energy transformation was up to 101 % under simulated 1-sun irradiation; the evaporation rate and efficiency of energy transformation were considerably higher than those of 2D planar wood evaporators. Furthermore, the effective seawater desalination performance and good durability of the 3D wood-based evaporator were demonstrated. This study provides different insights into the fabrication of high-efficiency wood-based solar steam generators with high prospects for application in seawater desalination.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"566 - 576"},"PeriodicalIF":2.4,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45513018","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

Wood color modification with iron salts aqueous solutions: effect on wood grain contrast and surface roughness. 铁盐水溶液对木色的改性:对木纹对比度和表面粗糙度的影响。

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-05-25 DOI: 10.1515/hf-2022-0189

Roberta Dagher, Tatjana Stevanovic, Véronic Landry

{"title":"Wood color modification with iron salts aqueous solutions: effect on wood grain contrast and surface roughness.","authors":"Roberta Dagher, Tatjana Stevanovic, Véronic Landry","doi":"10.1515/hf-2022-0189","DOIUrl":"https://doi.org/10.1515/hf-2022-0189","url":null,"abstract":"<p><p>Wood is a biosourced material with unique aesthetic features due to its anatomy and chemical composition. White oak wood surface color can be modified with the use of iron salts, which react with wood phenolic extractives, present as free molecules in wood porous structure. The impact of modifying wood surface color with iron salts on the final appearance of wood, including its color, grain contrast and surface roughness, was evaluated in this study. Results showed that following the application of iron (III) sulphate aqueous solutions on white oak wood surface, its roughness increased, which is due to grain raising after wetting of wood surface. The color modification of wood surface with iron (III) sulphate aqueous solutions was compared with a non-reactive water based blue stain. The contrast associated to wood grain that was expressed by the standard deviation of luminance values in wood images, also increased after application of the iron (III) sulphate aqueous solution on white oak wood surface. The comparison of contrast changes showed that wood samples stained with iron (III) sulphate on their curved surface had the highest increase in grain contrast compared to iron-stained wood showing the straight grain and to wood surfaces colored by a non-reactive water-based stain for both curved and straight grains.</p>","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 5","pages":"356-367"},"PeriodicalIF":2.4,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10214018/pdf/hfsg-77-5-hf-2022-0189.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9545788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radial distribution of vascular bundle morphology in Chinese bamboos: machine learning methodology for rapid sampling and classification 中国竹子维管束形态的径向分布:快速采样和分类的机器学习方法

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-05-15 DOI: 10.1515/hf-2022-0165

Jing Li, Haocheng Xu, Ying Zhang, Tuhua Zhong, Katherine Semple, V. Nasir, Hankun Wang, C. Dai

{"title":"Radial distribution of vascular bundle morphology in Chinese bamboos: machine learning methodology for rapid sampling and classification","authors":"Jing Li, Haocheng Xu, Ying Zhang, Tuhua Zhong, Katherine Semple, V. Nasir, Hankun Wang, C. Dai","doi":"10.1515/hf-2022-0165","DOIUrl":"https://doi.org/10.1515/hf-2022-0165","url":null,"abstract":"Abstract Variation in anatomical features of the culm wall namely the shape and size distributions of vascular bundles between different genera and species of bamboo is not well understood due to the cumbersome task of manual measurements. Using machine learning methodology, this work presents a universal vascular bundle detection model for rapid, reliable, and automatic characterization of vascular bundles in culm cross sections of 213 species across 23 genera of Chinese bamboos. The number of vascular bundles and the fiber sheath area have positive linear correlations with the outer circumference and the wall thickness, respectively. The distribution density of vascular bundles has a decay exponential correlation with the outer circumference and the wall thickness. The average fiber volume fraction was 35.2 % ± 7 % with relatively small variation between species. Bamboo species could be grouped into three categories based the endodermis to epidermis distribution pattern of radial and tangential length of vascular bundles, two categories of radial-to-tangential ratio and four categories of fiber sheath area distribution pattern. Implications on bamboo classification, structural and pulp/paper applications were discussed. The findings from this study provide groundwork for the establishment of a unified, authoritative and objective bamboo classification system based on the vascular tissue morphology.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"468 - 483"},"PeriodicalIF":2.4,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45012137","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: 1

Role of monolignol glucosides in supramolecular assembly of cell wall components in ginkgo xylem formation 单素糖苷在银杏木质部形成过程中细胞壁组分超分子组装中的作用

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-05-11 DOI: 10.1515/hf-2022-0163

N. Terashima, Y. Matsushita, Sachie Yagami, H. Nishimura, Masato Yoshida, K. Fukushima

{"title":"Role of monolignol glucosides in supramolecular assembly of cell wall components in ginkgo xylem formation","authors":"N. Terashima, Y. Matsushita, Sachie Yagami, H. Nishimura, Masato Yoshida, K. Fukushima","doi":"10.1515/hf-2022-0163","DOIUrl":"https://doi.org/10.1515/hf-2022-0163","url":null,"abstract":"Abstract The physical, chemical and biological properties of wood depend on the supramolecular assembly of cellulose microfibrils (CMFs), hemicelluloses (HCs) and lignin in the growing cell walls. Based on the 13C-tracer studies of ginkgo xylem formation, a hypothetical scenario for the role of monolignol glucosides (MLGs) in the assembly is proposed as follows: (1) Both moieties, aglycone monolignols and glycone d-glucose (d-Glc), play essential roles in a cooperative manner in delivery of hydrophobic and highly reactive p-hydroxycinnamyl- (H), coniferyl- (G) alcohols to the hydrophilic site of lignin deposition. (2) The d-Glc liberated at lignification site is converted into essential HCs mainly via Golgi apparatus under the influence of diurnally changing turgor pressure, and partly converted in the apoplast. (3) At cell corner middle lamella, a pressure-resistant layer of HG-lignin-HCs-CMFs is formed, and allows expansion of new cells in cambium region by elevation of turgor pressure. The deformable G-lignin-HCs-CMFs layer at secondary wall shrinks by dehydration of the swollen gel of HCs-CMFs during differentiation, and contributes posture control of standing tree. On-demand quick supply of a large amount of monolignols and HCs can be achieved by the large storage and delivery of MLGs in the growing ginkgo xylem.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"485 - 499"},"PeriodicalIF":2.4,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45963787","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

Frontmatter 头版头条

3区农林科学

Holzforschung Pub Date : 2023-05-01 DOI: 10.1515/hf-2023-frontmatter5

引用次数: 0

Role of α-Fe2O3 nano-particles in protecting wood from ultraviolet light degradation α-Fe2O3纳米颗粒对木材抗紫外线降解的保护作用

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-04-27 DOI: 10.1515/hf-2023-0001

Tengfei Yi, J. Morrell

{"title":"Role of α-Fe2O3 nano-particles in protecting wood from ultraviolet light degradation","authors":"Tengfei Yi, J. Morrell","doi":"10.1515/hf-2023-0001","DOIUrl":"https://doi.org/10.1515/hf-2023-0001","url":null,"abstract":"Abstract The incorporation of nano-particles into coatings to protect wood against UV light has tremendous potential for improving coating performance. However, the understanding of the mechanisms by which these particles function on wood surfaces remains limited. The distribution and potential chemical interactions between alpha Fe2O3 and wood were studied. The ability of different sizes of Fe2O3 particles to intercept various wavelengths of light was assessed using ultraviolet/visible (UV–vis) spectroscopy using TiO2 and ZnO particles for comparison. All particles intercepted UV light, but α-Fe2O3 also intercepted a portion of the visible spectrum which might help explain its better performance. Scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM-EDS) analysis of α-Fe2O3 nano-particle distribution on different wood orientations of radiata pine (Pinus radiata D. Don) and shining gum (Eucalyptus nitens) showed that iron particles were uniformly distributed on both pine and shining gum, but provided better UV protection to the more permeable radiata pine surfaces. Characterization of chemical interactions between α-Fe2O3 and isolated lignin and cellulose by Fourier Transform Infrared Spectroscopy (FTIR) suggested substantial interactions between these particles and lignin components, but little interaction with cellulose. The results suggest that the role of nano-particles in the UV protection of wood surface is to intercept and disperse the light energy while interacting with the wood.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"453 - 467"},"PeriodicalIF":2.4,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49133651","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

Synergistic improvement to dimensional stability of Populus cathay ana via hemicellulose removal/alkali lignin impregnation 半纤维素去除/碱木质素浸渍协同提高杨的尺寸稳定性

IF 2.4 3区农林科学

Holzforschung Pub Date : 2023-04-24 DOI: 10.1515/hf-2022-0147

Meng Yang, Runhua Zhang, E. Ma

{"title":"Synergistic improvement to dimensional stability of Populus cathay ana via hemicellulose removal/alkali lignin impregnation","authors":"Meng Yang, Runhua Zhang, E. Ma","doi":"10.1515/hf-2022-0147","DOIUrl":"https://doi.org/10.1515/hf-2022-0147","url":null,"abstract":"Abstract Poor dimensional stability restricts the commercial utilization of fast-growing wood. In this study, fast-growing poplar (Populus cathayana) was treated by removing hemicellulose with hydrothermal treatment and impregnating alkali lignin via full-cell process, synergistically, for enhanced dimensional stability. After modification, hydroxyl groups were reduced in hemicellulose removed wood (DHC), alkali lignin was observed to fill in the cell lumens of vessels and wood fibers in the impregnated wood (AL) and in the wood modified by hemicellulose removal with alkali lignin impregnation (DHCAL). Compared with untreated wood, the volumetric swelling ratio of DHC and AL decreased by 11 % and 21 % under relative humidity (RH) of 89 %, respectively. The volumetric swelling ratio of DHCAL decreased by over 50 %, indicating a positive synergistic effect. The combination of hemicellulose removal and alkali lignin impregnation treatment improved the dimensional stability of wood significantly by reconstructing wood chemical components with various levels of hygroscopicity. This work could meaningfully contribute to the efficient utilization of fast-growing wood and promote the added value of industrial alkali lignin.","PeriodicalId":13083,"journal":{"name":"Holzforschung","volume":"77 1","pages":"407 - 415"},"PeriodicalIF":2.4,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44626476","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