Nano-scale porosity of water-swollen wood cell walls: analysis of solute exclusion data from a new perspective

IF 4.9 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD

Cellulose Pub Date : 2025-04-02 DOI:10.1007/s10570-025-06494-y

Ramūnas Digaitis, Greeley Beck, Sune Tjalfe Thomsen, Maria Fredriksson, Emil Engelund Thybring

{"title":"Nano-scale porosity of water-swollen wood cell walls: analysis of solute exclusion data from a new perspective","authors":"Ramūnas Digaitis, Greeley Beck, Sune Tjalfe Thomsen, Maria Fredriksson, Emil Engelund Thybring","doi":"10.1007/s10570-025-06494-y","DOIUrl":null,"url":null,"abstract":"<div><p>The solute exclusion technique (SET) is often used to characterise the nano-porous structure of water-swollen cell walls. SET is based on the immersion of water-saturated wood samples in solutions of probe molecules of known size. Based on determined concentration differences in the solution before and after immersion, the accessible water within the wood is determined for each probe. However, this assumes that the concentration of probe molecules is the same in the pores of the material as in the surrounding bulk solution, but the concentration in narrow pores is actually lower than in the bulk solution. This study investigated the nano-porous structure of water-swollen wood cell walls by incorporating these known effects of concentration differences in narrow pores into the analysis. Based on solute exclusion measurements on both untreated and hydrothermally treated Norway spruce wood, the study explored the effect of modification on the nano-porous cell wall structure as well as potential sources of uncertainties such as soaking time, osmotic effects and probe molecule adsorption. The results suggested that the water-swollen, nano-porous structure of untreated and hydrothermally treated Norway spruce was dominated by one characteristic pore size which increased by hydrothermal treatment. The exact size depended on the assumed geometry of the pores.</p></div>","PeriodicalId":511,"journal":{"name":"Cellulose","volume":"32 6","pages":"3583 - 3595"},"PeriodicalIF":4.9000,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10570-025-06494-y.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cellulose","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10570-025-06494-y","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, PAPER & WOOD","Score":null,"Total":0}

引用次数: 0

Abstract

The solute exclusion technique (SET) is often used to characterise the nano-porous structure of water-swollen cell walls. SET is based on the immersion of water-saturated wood samples in solutions of probe molecules of known size. Based on determined concentration differences in the solution before and after immersion, the accessible water within the wood is determined for each probe. However, this assumes that the concentration of probe molecules is the same in the pores of the material as in the surrounding bulk solution, but the concentration in narrow pores is actually lower than in the bulk solution. This study investigated the nano-porous structure of water-swollen wood cell walls by incorporating these known effects of concentration differences in narrow pores into the analysis. Based on solute exclusion measurements on both untreated and hydrothermally treated Norway spruce wood, the study explored the effect of modification on the nano-porous cell wall structure as well as potential sources of uncertainties such as soaking time, osmotic effects and probe molecule adsorption. The results suggested that the water-swollen, nano-porous structure of untreated and hydrothermally treated Norway spruce was dominated by one characteristic pore size which increased by hydrothermal treatment. The exact size depended on the assumed geometry of the pores.

查看原文本刊更多论文

水膨胀木材细胞壁的纳米孔隙度：从新角度分析溶质排斥数据

溶质排斥技术（SET）常用于表征水膨胀细胞壁的纳米多孔结构。SET是基于水饱和木材样品在已知大小的探针分子溶液中的浸泡。根据浸入前后溶液中确定的浓度差异，确定每个探针中木材内的可接触水。然而，这是假设探针分子在材料孔隙中的浓度与周围散装溶液中的浓度相同，但在狭窄孔隙中的浓度实际上低于散装溶液中的浓度。本研究通过将这些已知的窄孔中浓度差异的影响纳入分析，研究了水膨胀木材细胞壁的纳米多孔结构。通过对未经处理和水热处理的挪威云杉木材进行溶质排斥测量，研究了改性对纳米多孔细胞壁结构的影响，以及浸泡时间、渗透效应和探针分子吸附等潜在不确定因素的来源。结果表明，未经水热处理和水热处理的挪威云杉的水胀、纳米孔结构以一种特征孔径为主，水热处理后该特征孔径增大。确切的尺寸取决于假设的孔隙几何形状。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Cellulose 工程技术-材料科学：纺织

CiteScore

10.10

自引率

10.50%

发文量

580

审稿时长

3-8 weeks

期刊介绍： Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.