Critical impact of nanocellulose on the synthesis of porous cellulose monolith with oriented microchannels: Structure control, mechanics, and mass transport
Critical impact of nanocellulose on the synthesis of porous cellulose monolith with oriented microchannels: Structure control, mechanics, and mass transport
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纳米纤维素对定向微通道多孔纤维素整体合成的关键影响：结构控制、力学和传质
DOI：
10.1007/s12274-023-5414-7
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发表时间：
2022
期刊：
影响因子：
9.9
通讯作者：
Hirotomo Nishihara
中科院分区：
文献类型：
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作者：
1.Rui Tang;Zheng-Ze Pan;Minghao Liu;Mao Ohwada;Hirotomo Nishihara
从生物质中收获的纳米纤维素具有吸引人的性质，促进了其实际应用的研究。在这里，我们研究了纳米纤维素基多孔整料与定向微通道，可以通过单向冷冻方法制造。在该方法中，将水分散的纤维素纳米纤维（CNF）以受控的速度浸入冷源中，随后进行冷冻干燥。多孔纤维素块体的结构主要取决于两个因素：冷冻条件和分散的CNF的性质。前一种情况以前已经调查过。然而，后者的影响仍不清楚。在这项研究中，使用了由2，2，6，6-四甲基哌啶-1-氧介导的氧化纤维素纳米纤维（TOCN）制备的具有不同长径比和浓度的CNF悬浮液。这些变量对所得结构的影响，包括孔的形状，尺寸和壁厚，进行了检查。在此基础上，研究了TOCN对多孔纤维素整体结构的影响。我们的研究结果表明，取决于它们的结构，多孔纤维素整料表现出不同的机械强度和传质性能。特别地，使用由5.1重量%的纤维素合成的多孔纤维素整料。较短的TOCN密度较低（55.9 mg·cm−3），机械强度较高（8，687 kPa），质量迁移速度较快。
Nanocellulose harvested from biomass has attractive properties that have promoted research on its practical applications. Herein, we investigated nanocellulose-based porous monoliths with oriented microchannels that can be fabricated via a unidirectional freezing method. In this method, water-dispersed cellulose nanofibers (CNFs) were immersed into a cold source at a controlled speed, followed by subsequent freeze-drying. The structure of porous cellulose monoliths mainly depends on two factors: the freezing conditions and properties of the dispersed CNFs. The former has been investigated previously. However, the effects of the latter remain unclear. In this study, CNF suspensions prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl-mediated oxidation cellulose nanofibers (TOCNs) with different aspect ratios and concentrations were used. The effects of these variables on the resulting structure, including the pore shape, size, and wall thickness, were examined. Based on the results, the impact of TOCNs on the structure of porous cellulose monoliths was investigated. Our findings suggested that depending on their structure, the porous cellulose monoliths exhibit different mechanical strengths and mass transport properties. In particular, porous cellulose monoliths synthesized from 5.1 wt.% short TOCNs exhibited a low density (55.9 mg·cm−3), high mechanical strength (8687 kPa), and fast mass transport.
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具有受控微观形态的氧化石墨烯/纤维素纳米纤维冷冻凝胶
DOI：
--
发表时间：
2021
期刊：
影响因子：
--
作者：
Zheng-Ze Pan;Aleksandra Govedarica;Milana Trifkovic;Rui Tang;Quan-Hong Yang;Hirotomo Nishihara
通讯作者：
Hirotomo Nishihara
影响因子：
17.1
作者：
Wang, Chunhui;Chen, Xiong;Ruoff, Rodney S.
通讯作者：
Ruoff, Rodney S.
影响因子：
4.9
作者：
Mukai, SR;Nishihara, H;Tamon, H
通讯作者：
Tamon, H
影响因子：
8.6
作者：
Nishihara, H;Mukai, SR;Tamon, H
通讯作者：
Tamon, H
影响因子：
6.2
作者：
Saito, Tsuguyuki;Kimura, Satoshi;Isogai, Akira
通讯作者：
Isogai, Akira