Atomic-scale dents on cellulose nanofibers: the origin of diverse defects in sustainable fibrillar materials

Ito, Tomoki; Daicho, Kazuho; Fujisawa, Shuji; Saito, Tsuguyuki; Kobayashi, Kazunori

doi:10.1039/d2nh00355d

Cited by 9 publications

(1 citation statement)

References 34 publications

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“…Moreover, imperfections, kinks, and dents are also explorable with AFM. In ref , authors reported atomic scale dent defects on CNF as observed with AFM. These deep dents were observed mostly around kinked regions and their extent decreased when CNFs became shorter.…”

Section: Application Of Afm On Cncmentioning

confidence: 98%

Cellulose Nanocrystals Examined by Atomic Force Microscopy: Applications and Fundamentals

Moud

2022

ACS Food Sci. Technol.

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Cellulose nanocrystals (CNCs) are nanoscale particles with huge surface areas, excellent mechanical properties, and the ability to develop tunable surface chemistry, thus allowing them to be mixed into a wide range of matrices. Using atomic force microscopy (AFM), we highlight recent developments in the microstructural characterization of CNC particles in various shapes at both particle and organization scales. Considering new uses for CNC suspensions and gels and given the considerable potential of CNC-based products in medicinal, energy, cosmetics, filtration, and food applications, leveraging existing state-of-the-art characterization technologies such as AFM to improve CNC-produced properties cannot be ruled out. AFM may be used as a probe to disclose more intimate information about CNCs and can show modulus, size, and morphology in comparison to other characterization tools. AFM based on the literature review here was found to be a good assessment tool to verify the state of interaction, the adhesion strength of certain particles or chemicals, and the mechanical properties of CNCs. Thus, in tandem with other technologically advanced characterization tools, knowledge provided here for proper assessment of CNCs is necessary. Based on the AFM application currently widespread on CNCs, it appears that more research efforts are needed to provide additional cues regarding CNC individual states or the organized state (isotropic or liquid crystalline) for future sustainable, ecofriendly product designs based on CNCs.

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Section: Application Of Afm On Cncmentioning

confidence: 98%

Cellulose Nanocrystals Examined by Atomic Force Microscopy: Applications and Fundamentals

Moud

2022

ACS Food Sci. Technol.

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Structural and Material Properties of Chitin Nanofibers Produced Without Deacetylation Treatment

Tomita,

Yagita,

Kaku

et al. 2024

Nano Select

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Deacetylation pretreatment is commonly applied to chitin nanofibers to introduce positive charges on their surface, increasing their fibrillation efficiency in water. However, without this treatment, chitin cannot be easily disintegrated into fibers with widths of several nanometers. Here, we developed chitin nanofibers from crab shells without deacetylation treatment. The chitin nanofibers had an average width of 6.5 nm, a length of several micrometers, and good colloidal stability in water. The nanofibers formed more stable Pickering emulsions than did the deacetylated chitin nanofibers because of better adsorption at the water–oil interface. Even though the strength and toughness of the chitin nanofiber films were inferior to those of the films of the deacetylated chitin nanofibers, the chitin nanofibers possessed unique optical properties, combining high transparency and high haze, which was not observed in the deacetylated chitin nanofiber film. These characteristics indicate that the use of chitin nanofibers without deacetylation treatment could expand the range of material properties available for chitin‐based materials, providing new avenues for controlling material properties. Our research highlights the potential of using chitin nanofibers in the development of green, high‐performance materials for applications in cosmetics and optics, contributing valuable insights into the sustainable utilization of chitin‐based nanofibers.

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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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Atomic-scale dents on cellulose nanofibers: the origin of diverse defects in sustainable fibrillar materials

Abstract: Atomic-scale dent structures on the surfaces of cellulose nanofibers were detected by comparing the experimentally measured and computer-simulated widths of single nanofibers. These dent parts constituted at least 30–40% of...

Cited by 9 publications

References 34 publications

Cellulose Nanocrystals Examined by Atomic Force Microscopy: Applications and Fundamentals

Cellulose Nanocrystals Examined by Atomic Force Microscopy: Applications and Fundamentals

Structural and Material Properties of Chitin Nanofibers Produced Without Deacetylation Treatment

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

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