Cellulose cryogels prepared by regeneration from phosphoric acid solutions

Tyshkunova, Irina V.; Чухчин, Д. Г.; Gofman, I. V.; Poshina, Daria N.; Skorik, Yury А.

doi:10.1007/s10570-021-03851-5

Cited by 18 publications

(38 citation statements)

References 49 publications

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“…During this time, solutions with a chitin concentration from 5 to 15% in phosphoric acid can be obtained. This confirms the better solubility of chitin in comparison with the previously studied cellulose [ 29 ].…”

Section: Resultssupporting

confidence: 86%

“…In this case, a powder was obtained, and some fragments of cryogel were visible. Therefore, we decided to use chitin concentrations from 3 to 15% ( Table 1 ), similarly to the previously obtained cellulose cryogels [ 29 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

“…Small fragments of chitin were still visible in the solution after 6 h of dissolution (Sample 5). We obtained 10 and 15% solutions of chitin in 24–25 h at 20 ± 3 °C; this was a shorter time than the 48 h required for 8.4% cellulose solution at 20 ± 2 °C [ 29 ]. The solution with a 15% chitin concentration of was difficult to stir at the initial stages of dissolution.…”

Section: Resultsmentioning

confidence: 99%

“…Increasing the chitin concentration resulted in a lower porosity (96–97%) and a higher density (ρ 0.04–0.06 g/cm 3 ) (Samples 2–4). Chitin cryogels were less dense than the previously obtained cellulose cryogels (ρ 0.091–0.161 g/cm 3 ) using phosphoric acid as a solvent [ 29 ]. Only cryogels based on nanochitin had a lower density (ρ 0.89 ± 0.22 and 1.28 ± 0.24 mg/cm 3 ) [ 21 ].…”

Section: Resultsmentioning

confidence: 99%

“…The cryogel yield, geometrical dimensions, volume shrinkage, volume variation (∆V), density (ρ), specific mass, porosity (the density of bulk chitin is taken as 1.425 g/cm 3 [ 28 ], and swelling were measured and calculated as described previously [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

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Chitin Cryogels Prepared by Regeneration from Phosphoric Acid Solutions

et al. 2021

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Cryogelation is a developing technique for the production of polysaccharide materials for biomedical applications. The formation of a macroporous structure during the freeze-drying of polysaccharide solutions creates biomaterials suitable for tissue engineering. Due to its availability, biocompatibility, biodegradability, and non-toxicity, chitin is a promising natural polysaccharide for the production of porous materials for tissue engineering; however, its use is limited due to the difficulty of dissolving it. This work describes the preparation of cryogels using phosphoric acid as the solvent. Compared to typical chitin solvents phosphoric acid can be easily removed from the product and recovered. The effects of chitin dissolution conditions on the structure and properties of cryogels were studied. Lightweight (ρ 0.025–0.059 g/cm3), highly porous (96–98%) chitin cryogels with various heterogeneous morphology were produced at a dissolution temperature of 20 ± 3 °C, a chitin concentration of 3–15%, and a dissolution time of 6–25 h. The crystallinity of the chitin and chitin cryogels was evaluated by 13C CP-MAS NMR spectroscopy and X-ray diffractometry. Using FTIR spectroscopy, no phosphoric acid esters were found in the chitin cryogels. The cryogels had compressive modulus E values from 118–345 kPa and specific surface areas of 0.3–0.7 m2/g. The results indicate that chitin cryogels can be promising biomaterials for tissue engineering.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Chitin Cryogels Prepared by Regeneration from Phosphoric Acid Solutions

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Advanced Functionalized Materials Based on Layer‐by‐Layer Assembled Natural Cellulose Nanofiber for Electrodes: A Review

Du,

Zhang,

Zhang

et al. 2023

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The depletion of fossil fuel resources and its impact on the environment provide a compelling motivation for the development of sustainable energy sources to meet the increasing demand for energy. Accordingly, research and development of energy storage devices have emerged as a critical area of focus. The electrode materials are critical in the electrochemical performance of energy storage devices, such as energy storage capacity and cycle life. Cellulose nanofiber (CNF) represents an important substrate with potentials in the applications of green electrode materials due to their environmental sustainability and excellent compatibility. By utilizing the layer‐by layer (LbL) process, well‐defined nanoscale multilayer structure is prepared on a variety of substrates. In recent years, increasing attention has focused on electrode materials produced from LbL process on CNFs to yield electrodes with exceptional properties, such as high specific surface area, outstanding electrical conductivity, superior electrochemical activity, and exceptional mechanical stability. This review provides a comprehensive overview on the development of functional CNF via the LbL approach as electrode materials.

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