Fully Wood-Based Transparent Plates with High Strength, Flame Self-Extinction, and Anisotropic Thermal Conduction

Ishioka, Shun; Isobe, Noriyuki; Hirano, Takayuki; Matoba, Nobuhiro; Fujisawa, Shuji; Saito, Tsuguyuki

doi:10.1021/acssuschemeng.2c06344

Cited by 9 publications

(1 citation statement)

References 43 publications

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“…To adjust the concentration, the dispersion was diluted with distilled water to 0.35% w/w. [ 55 ] Three types of films with different water contents (≈30%, 10%, 1%) was prepared by using dispersions. The 0.35% w/w CNF dispersion was poured into a polystyrene dish and allowed to condense at rest in a thermo‐hygrostat maintained at 40 °C and 80% relative humidity (RH).…”

Section: Methodsmentioning

confidence: 99%

Molecular Dynamics of Drying‐Induced Structural Transformations in a Single Nanocellulose

Fujisawa

Daicho

Yurtsever

et al. 2023

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Nanocellulose is attracting attention in the field of materials science as a sustainable building block. Nanocellulose‐based materials, such as films, membranes, and foams, are fabricated by drying colloidal dispersions. However, little is known about how the structure of a single nanocellulose changes during the complex drying process. Here, all‐atom molecular dynamics simulations and atomic force microscopy is used to investigate the structural dynamics of single nanocellulose during drying. It is found that the twist morphology of the nanocellulose became localized along the fibril axis during the final stage of the drying process. Moreover, it is shown that conformational changes at C6 hydroxymethyl groups and glycoside bond is accompanied by the twist localization, indicating that the increase in the crystallinity occurred in the process. It is expected that the results will provide molecular insights into nanocellulose structures in material processing, which is helpful for the design of materials with advanced functionalities.

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Section: Methodsmentioning

confidence: 99%

Molecular Dynamics of Drying‐Induced Structural Transformations in a Single Nanocellulose

Fujisawa

Daicho

Yurtsever

et al. 2023

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Emerging Sustainable Structural Materials by Assembling Cellulose Nanofibers

Yang,

Yue,

Liu

et al. 2024

Advanced Materials

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Under the guidance of the carbon peaking and carbon neutrality goals, the urgency for green ecological construction and the depletion of nonrenewable resources highlight the importance of the research and development of sustainable new materials. Cellulose nanofiber (CNF) is the most abundant natural nanoscale building block widely existing on Earth. CNF has unique intrinsic physical properties, such as low density, low coefficient of thermal expansion, high strength, and high modulus, which is an ideal candidate with outstanding potential for constructing sustainable materials. In recent years, CNF‐based structural material has emerged as a sustainable lightweight material with properties very different from traditional structural materials. Here, to comprehensively introduce the assembly of structural materials based on CNF, it starts with an overview of different forms of CNF‐based materials, including fibers, films, hydrogels, aerogels, and structural materials. Next, the challenges that need to be overcome in preparing CNF‐based structural materials are discussed, their assembly methods are introduced, and an in‐depth analysis of the advantages of the CNF‐based hydrogel assembly strategy to fabricate structural materials is conducted. Finally, the unique properties of emerging CNF‐based structural materials are summarized and concluded with an outlook on their design and functionalization, potentially paving the way toward new opportunities.

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Monitoring crystallite fusion of nanocellulose during colloid condensation

et al. 2023

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The crystallinity of cellulose decreases when bundled microfibrils are dispersed in water as cellulose nanofibers (CNFs) or physically separated into finer nanoscale fibrils or single microfibrils. The crystallinity of these CNFs is recovered when they become densely assembled through the dehydration of the dispersion. In this process, multiple CNFs are assumed to partially fuse, leading to the enlargement of crystallite widths. The mechanism of this CNF fusion is, however, not well understood. In this study, the recovery process of the crystallinity of CNFs was monitored by sampling wet CNF gels during condensation from a dilute dispersion to a dense aggregate, followed by wide-angle X-ray diffractometry (WAXD) and solid-state 13C nuclear magnetic resonance (NMR) spectroscopy analyses after supercritical drying. In the WAXD analysis, a two-step enlargement in the (2 0 0) crystal size was observed: the first step was a rapid increase in the range of solid content up to 1%, followed by a gradual increase in the range of 1–85%. The crystallinity index estimated by NMR hardly changed in the range of 0.5–30% but gradually increased in the range of 30–85%. A portion of the CNF samples, without drying, were also subjected to small-angle X-ray scattering and viscoelasticity analyses, indicating that the inter-CNF contact points in water significantly increased until reaching a solid content of 1%, and then at solid contents higher than 1%, the contact areas of each point gradually expanded. Finally, a mechanism of CNF fusion was proposed based on these results.

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Fully Wood-Based Transparent Plates with High Strength, Flame Self-Extinction, and Anisotropic Thermal Conduction

Cited by 9 publications

References 43 publications

Molecular Dynamics of Drying‐Induced Structural Transformations in a Single Nanocellulose

Molecular Dynamics of Drying‐Induced Structural Transformations in a Single Nanocellulose

Emerging Sustainable Structural Materials by Assembling Cellulose Nanofibers

Monitoring crystallite fusion of nanocellulose during colloid condensation

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