Nanostructurally Controlled Hydrogel Based on Small‐Diameter Native Chitin Nanofibers: Preparation, Structure, and Properties

Mushi, Ngesa Ezekiel; Kochumalayil, Joby J.; Cervin, Nicholas Tchang; Zhou, Qi; Berglund, Lars A.

doi:10.1002/cssc.201501697

Cited by 67 publications

(48 citation statements)

References 42 publications

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“…In dynamic viscoelasticity measurements, the amount of stress is detected for a given strain applied to a sample, the complex elastic modulus (which is a proportionality constant for strain vs. stress) can be determined, and the contribution ratio of the viscosity and elasticity for that constant can be calculated from the phase delay, . Here, G′ is the stiffness of the viscoelastic fluid resulting from the entanglement or crosslinking of the network structure, while the loss modulus, G″, is the compliance of the viscoelastic fluid resulting from the energy dissipated owing to the permanent deformation of the polymer [13].…”

Section: Introductionmentioning

confidence: 99%

Systematic dynamic viscoelasticity measurements for chitin nanofibers prepared with various concentrations, disintegration times, acidities, and crystalline structures

Suenaga

Osada

2018

International Journal of Biological Macromolecules

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Dynamic viscoelasticities were measured for chitin nanofiber (ChNF) dispersions prepared with various concentrations, disintegration times, acidities, and crystalline structures. The 0.05w/v% dispersions of pH neutral ChNFs continuously exhibited elastic behavior. The 0.05w/v% dispersions of acidified ChNFs, on the other hand, transitioned from a colloidal dispersion to a critical gel and then exhibited elastic behavior with increasing ChNF concentration. A double-logarithmic chart of the concentration vs. the storage modulus was prepared and indicated the fractal dimension and the nanostructure in the dispersion. The results determined that the neutral α- and β-ChNFs were dispersed but showed some remaining aggregations and that the acidified β-ChNFs were completely individualized. In addition, the α-chitin steadily disintegrated with increasing disintegration time, and the aspect ratio of the β-chitin decreased as a result of the exscessive disintegration. The storage moduli of the ChNFs were greater than those of chitin solutions, nanorods, and nanowhiskers with the same solids concentrations.

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Section: Introductionmentioning

confidence: 99%

Systematic dynamic viscoelasticity measurements for chitin nanofibers prepared with various concentrations, disintegration times, acidities, and crystalline structures

Suenaga

Osada

2018

International Journal of Biological Macromolecules

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“…For example, the G ’ value for 3% chitin nanofiber gel that was covalently bonded to a polysaccharide was reported to be 13 kPa, and the G ’ for ATBA G had a comparable value. [ 38 ] Thus, the mechanical properties of ATBA G were likely influenced by the formation of the diversified aggregation of ATBA molecules.…”

Section: Resultsmentioning

confidence: 99%

Irreversible aggregation of alternating tetra-block-like amphiphile in water

Shota¹,

Banno²,

Takagi³

et al. 2018

PLoS ONE

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As a frontier topic of soft condensed matter physics, irreversible aggregation has drawn attention for a better understanding of the complex behavior of biomaterials. In this study, we have described the synthesis of an artificial amphiphilic molecule, an alternating tetra-block-like amphiphile, which was able to diversify its aggregate structure in water. The aggregated state of its aqueous dispersion was obtained by slow evaporation of the organic solvent at room temperature, and it collapsed irreversibly at ~ 50°C. By using a cryo-transmission electron microscope and a differential scanning calorimeter, it was revealed that two types of molecular nanostructures were formed and developed into submicro- and micrometer-sized fibrils in the aggregated material.

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“…The SSA calculated from nitrogen adsorption/desorption isotherms is as high as 260 m 2 g −1 , proving a good dispersion of ChNF in the solution. Tsutsumi et al and Mushi et al obtained ChNF hydrogels under alkaline condition, followed by freeze‐drying or supercritical drying. The SSAs of ChNF aerogels reach up to 24, 212, and 289 m 2 g −1 through freeze‐drying from water, freeze‐drying from tert ‐butanol, and scCO 2 drying, respectively.…”

Section: Fabrication Of Pnas and Their Propertiesmentioning

confidence: 99%

Aerogels Derived from Polymer Nanofibers and Their Applications

Qian

Wang

Zhao

2018

Macromol. Rapid Commun.

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Aerogels are gels in which the solvent is supplanted by air while the pores and networks are largely maintained. Owing to their low bulk density, high porosity, and large specific surface area (SSA), aerogels are promising for many applications. Various inorganic aerogels, e.g., silica aerogels, are intensively studied. However, the mechanical brittleness of common inorganic aerogels has seriously restricted their applications. In the past decade, nanofibers have been developed as building blocks for the construction of aerogels to improve their mechanical property. Unlike traditional frameworks constructed by interconnected particles, nanofibers can form chemically cross-linked and/or physically entangled 3D skeletons, thus showing flexibility instead of brittleness. Therefore, excellent elasticity and toughness, ultralow density, high SSA, and tunable chemical composition can be expected for the polymer nanofiber-derived aerogels (PNAs). In this review, recent research progress in the fabrication, properties, and applications of PNAs is summarized. Various nanofibers, including nanocelluloses, nanochitins, and electrospun nanofibers are included, as well as carbon nanofibers from the corresponding organic precursors. Typical applications in supercapacitors, electrocatalysts for oxygen reduction reaction, flexible electrodes, oil absorbents, adsorbents, tissue engineering, stimuli-responsive materials, and catalyst carriers, are presented. Finally, the challenges and future development of PNAs are discussed.

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Nanostructurally Controlled Hydrogel Based on Small‐Diameter Native Chitin Nanofibers: Preparation, Structure, and Properties

Cited by 67 publications

References 42 publications

Systematic dynamic viscoelasticity measurements for chitin nanofibers prepared with various concentrations, disintegration times, acidities, and crystalline structures

Systematic dynamic viscoelasticity measurements for chitin nanofibers prepared with various concentrations, disintegration times, acidities, and crystalline structures

Irreversible aggregation of alternating tetra-block-like amphiphile in water

Aerogels Derived from Polymer Nanofibers and Their Applications

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