Diffractometric method for determining the degree of crystallinity of materials

Чухчин, Д. Г.; Малков, А. В.; Tyshkunova, Irina V.; Mayer, Lyudmila; Новожилов, Е. В.

doi:10.1134/s1063774516030081

Cited by 23 publications

(12 citation statements)

References 6 publications

(11 reference statements)

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“…The MCC had a weight-average molecular weight (M w ) of 1 × 10 5 , as determined by gel permeation chromatography (GPC). A cellulose crystallinity of 55.0% was measured by XRD [39] using the program described in [40]. The crab α-chitin (BioLog Heppe GmbH, Landsberg, Germany) used had M w of 5.86 × 10 5 and dispersity (Ð) of 4.3 [41].…”

Section: Methodsmentioning

confidence: 99%

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Biophysical Characterization and Cytocompatibility of Cellulose Cryogels Reinforced with Chitin Nanowhiskers

et al. 2022

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Polysaccharide-based cryogels are promising materials for producing scaffolds in tissue engineering. In this work, we obtained ultralight (0.046–0.162 g/cm3) and highly porous (88.2–96.7%) cryogels with a complex hierarchical morphology by dissolving cellulose in phosphoric acid, with subsequent regeneration and freeze-drying. The effect of the cellulose dissolution temperature on phosphoric acid and the effect of the freezing time of cellulose hydrogels on the structure and properties of the obtained cryogels were studied. It has been shown that prolonged freezing leads to the formation of denser and stronger cryogels with a network structure. The incorporation of chitin nanowhiskers led to a threefold increase in the strength of the cellulose cryogels. The X-ray diffraction method showed that the regenerated cellulose was mostly amorphous, with a crystallinity of 26.8–28.4% in the structure of cellulose II. Cellulose cryogels with chitin nanowhiskers demonstrated better biocompatibility with mesenchymal stem cells compared to the normal cellulose cryogels.

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Section: Methodsmentioning

confidence: 99%

“…The tablet's thickness was 1 mm. The degree of crystallinity was determined from diffractograms according to a previously published method [39], using a program specially designed for calculating crystallinity [40].…”

Section: Methodsmentioning

confidence: 99%

Biophysical Characterization and Cytocompatibility of Cellulose Cryogels Reinforced with Chitin Nanowhiskers

et al. 2022

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“…For crystallinity assessment, we used the approximate evaluation involving a total intensity at 2θ of 20° and an intensity of amorphous scattering at 16°. This crude estimation has recently been shown to be inaccurate [ 39 ]; however, it is easy and does not require any crystalline and amorphous reference samples.…”

Section: Resultsmentioning

confidence: 99%

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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“…The degree of CB crystallinity was calculated based on a diffractogram using the technique proposed by the authors of [16], as the ratio of the crystallinity index of the sample under study to the crystallinity index of the standard (in this study, silicon):…”

Section: Introductionmentioning

confidence: 99%

“…The crystallinity index was calculated as the ratio of the modulus integral of the intensity derivative over angle 2 to the intensity integral over angle 2 [16]:…”

Section: Introductionmentioning

confidence: 99%

Structure and phase composition of electrically conductive carbon black

Kropotin

Nesov

Polonyankin

et al. 2022

J. Phys.: Conf. Ser.

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A comprehensive study of the structure and phase composition of a promising brand of electrically conductive carbon black was carried out. It is shown that the material under study has a complex phase composition, which, along with carbon, includes other elements and compounds, such as sulphur, oxygen, nitrogen, and vanadium oxides. The structural state of carbon black can be defined as amorphous. The presence of functional oxygen-containing groups in the material, presumably attached to the edge carbon atoms of graphene layers, has been proved. The interrelation of some characteristics of the structure and phase composition of the material and the properties of polymer composites is discussed.

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Diffractometric method for determining the degree of crystallinity of materials

Cited by 23 publications

References 6 publications

Biophysical Characterization and Cytocompatibility of Cellulose Cryogels Reinforced with Chitin Nanowhiskers

Biophysical Characterization and Cytocompatibility of Cellulose Cryogels Reinforced with Chitin Nanowhiskers

Chitin Cryogels Prepared by Regeneration from Phosphoric Acid Solutions

Structure and phase composition of electrically conductive carbon black

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