Multimodal structural humidity-response of cellulose nanofibril foams derived from wood and upcycled cotton textiles

IF 12.5 1区化学 Q1 CHEMISTRY, APPLIED Carbohydrate Polymers Pub Date : 2025-06-01 Epub Date: 2025-03-11 DOI:10.1016/j.carbpol.2025.123485

Agnes Åhl , Maria-Ximena Ruiz-Caldas , Elisabetta Nocerino , André L.C. Conceição , Kim Nygård , Samuel McDonald , Mira Viljanen , Aji P. Mathew , Lennart Bergström

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Abstract

We have produced foams from cellulose nanofibrils from upcycled cotton (upCNF) and wood (wCNF) through unidirectional (UIT) and multidirectional ice-templating (MIT) and investigated the structural humidity response through in-situ WAXS, SAXS, and micro tomography (μCT) between 10 and 95 % relative humidity (RH). The upCNF and wCNF WAXS patterns displayed a shape- and position shift as the RH was increased, with a compression in the (200) direction and an elongation in the (004) direction. The average separation distance extracted from the 1D SAXS patterns revealed no significant change for the upCNF foams regardless of RH and processing route, while a significant increase was observed for the wCNF foams. The μCT measurements of the upCNF foams showed a slight shift in macropore distribution towards larger pores between 50 and 80 % RH which can be attributed to the weakening and partial disintegration of the pore wall as more moisture is introduced. The humidity-induced structural alterations of the upCNF foam were significantly lower compared to the wCNF foams, confirming our claim of upCNF being more moisture resistant than wCNF foams.

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从木材和回收棉纺织品中提取的纤维素纳米纤维泡沫的多模式结构湿度响应

我们通过单向（UIT）和多向冰模板（MIT）制备了再生棉（upCNF）和木材（wCNF）的纤维素纳米纤维泡沫，并通过原位WAXS， SAXS和微断层扫描（μCT）研究了相对湿度（RH）在10%至95%之间的结构湿度响应。随着相对湿度的增加，upCNF和wCNF的WAXS模式表现出形状和位置的变化，在（200）方向上压缩，在（004）方向上延伸。从一维SAXS图中提取的平均分离距离显示，无论RH和加工路线如何，upCNF泡沫的平均分离距离没有显著变化，而wCNF泡沫的平均分离距离显著增加。在50 ~ 80%相对湿度范围内，upCNF泡沫的大孔分布有轻微的向大孔方向转变，这可能是由于孔隙壁随着水分的增加而减弱和部分分解所致。与wCNF泡沫相比，upCNF泡沫的湿度引起的结构变化显着降低，证实了我们声称upCNF比wCNF泡沫更具防潮性。

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来源期刊

Carbohydrate Polymers 化学-高分子科学

CiteScore

22.40

自引率

8.00%

发文量

1286

审稿时长

47 days

期刊介绍： Carbohydrate Polymers stands as a prominent journal in the glycoscience field, dedicated to exploring and harnessing the potential of polysaccharides with applications spanning bioenergy, bioplastics, biomaterials, biorefining, chemistry, drug delivery, food, health, nanotechnology, packaging, paper, pharmaceuticals, medicine, oil recovery, textiles, tissue engineering, wood, and various aspects of glycoscience. The journal emphasizes the central role of well-characterized carbohydrate polymers, highlighting their significance as the primary focus rather than a peripheral topic. Each paper must prominently feature at least one named carbohydrate polymer, evident in both citation and title, with a commitment to innovative research that advances scientific knowledge.