Cellulose nanocrystals with different length-to-diameter ratios extracted from various plants using novel system acetic acid/phosphotungstic acid/octanol-1

Торлопов, М. А.; Mikhaylov, Vasily I.; Udoratina, E. V.; Алешина, Л. А.; Prusskii, A. I.; Цветков, Н. В.; Krivoshapkin, Pavel V.

doi:10.1007/s10570-017-1624-z

Cited by 44 publications

(13 citation statements)

References 35 publications

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“…Formation of low-substituted cellulose acetates was noted by us earlier in the process of preparation of CNC in an acetic acid medium . For additional verification, CNC was treated with 0.1 M Na 2 CO 3 .…”

Section: Resultsmentioning

confidence: 80%

“…25 Formation of low-substituted cellulose acetates was noted by us earlier in the process of preparation of CNC in an acetic acid medium. 26 For additional verification, CNC was treated with 0.1 M Na 2 CO 3 . The intensity of the band at 1734 cm −1 characteristic of the acetate group decreased (Figure 3, CNCr), indicating a partial saponification of ester groups.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

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A Fenton-like System (Cu(II)/H₂O₂) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface

Торлопов

Martakov

Mikhaylov

et al. 2019

Ind. Eng. Chem. Res.

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A preparation process of cellulose nanocrystals using a Fenton-like system was presented. Rod-shaped cellulose nanocrystals were isolated after treatment in the H2O2/acetic acid/2–6 mol % copper acetate system. The morphology and sizes of rod-shaped particles were determined by AFM (atomic force microscopy) and cryo-EM (cryo-electron microscopy). X-ray diffraction proves that the prepared particles have a natural polymorphic modification of cellulose I with a high crystallinity index. Thermogravimetry data indicates a slight decrease in thermal stability of the particles when compared to starting cellulose, correlating with an increase in the number of carbonyl groups determined by chemical analysis. Using pK spectroscopy, active acid–base surface sites (pK i 5.5 and 7.9) were quantitatively determined. The cellulose nanoparticles formed stable hydrosols. Using photometry and dynamic light scattering, it has been established that the critical concentration of coagulation of sols is 76 mM KCl.

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Section: Resultsmentioning

confidence: 80%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

A Fenton-like System (Cu(II)/H₂O₂) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface

Торлопов

Martakov

Mikhaylov

et al. 2019

Ind. Eng. Chem. Res.

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“…Formation of sulfo-groups or esterified alcohol groups is expected for the first and the second above-mentioned synthesis schemes, correspondingly. Surface groups may affect the stability and viscosity of the CNC suspension, as well as the critical concentration required for the formation of the liquid crystalline phase …”

Section: Resultsmentioning

confidence: 96%

“…Amorphous regions of microcrystalline cellulose react kinetically faster than crystalline ones, thus forming sulfo-groups or a carboxylic acid group at the end of the particles for s-and c-CNC, correspondingly Figure 1. 14 Formation of sulfo-groups or esterified alcohol groups is expected for the first 38 and the second 39 above-mentioned synthesis schemes, correspondingly. Surface groups may affect the stability and viscosity of the CNC suspension, as well as the critical concentration required for the formation of the liquid crystalline phase.…”

Section: Resultsmentioning

confidence: 99%

Printing of Colorful Cellulose Nanocrystalline Patterns Visible in Linearly Polarized Light

Eremeeva

Сергеева

Neterebskaia

et al. 2020

ACS Appl. Mater. Interfaces

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This study addresses the inkjet printing approach for fabrication of cellulose nanocrystalline (CNC) patterns with tunable optical properties varied by the thickness of deposited layers. In particular, forming functional patterns visible only in linearly polarized light is of the primary interest. The possibility of controlling the bright iridescent color response associated with the birefringence in the chiral anisotropic structure of inkjet-printed layers of CNC with sulfo-groups (s-CNC) has been thoroughly investigated. In this connection, we have elaborated an appropriate synthesis sequence for deriving printable inks in the form of sedimentation-stable s-CNC colloids with various concentrations of solid phase and experimentally determined the optimal regimes of their inkjet printing. For this purpose, the rheological parameters and s-CNC particle concentration have also been optimized. The study is accomplished with a comprehensive optical characterization of the deposited s-CNC layers with variable thickness, drying conditions, and the polarization state. The experimental results demonstrate the feasibility of inkjet printing technology to perform the precise fabrication of optically active s-CNC patterns with variable optical properties. These results are particularly relevant for applications requiring special conditions of color demonstration in security printing for such as anticounterfeiting applications, polygraphy decoration printing, and color photo filters.

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“…- [12][13][14][15], [16,17]. [18,19], -( , ) [20,21], - [22,23], [24][25][26], [27][28][29][30] [31] , , , .…”

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Dispersibility of Nanocrystalline Cellulose in Organic Solvents

Воронова¹,

Суров²,

Рублева³

et al. 2019

JCPRM

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Aqueous suspensions of nanocrystalline cellulose (NCC) were obtained by sulfuric acid hydrolysis using the standard procedure. Suspensions, films and airgel of NCC were characterized by various methods: the degree of polymerization was determined, elemental analysis was carried out, the degree of crystallinity and crystallite size were calculated on the basis of X-ray data, the morphology of NCC aerogels was studied using scanning electron microscopy. The particle size of the NCC was determined using a transmission electron microscope, a scanning atomic-force microscope and the method of dynamic light scattering. NFC hydrosols with different pH were used to prepare lyophilized NCC samples. From NCC hydrosols with pH 2.2, by gradual replacement of water with an organic solvent, NCC organogels with acetone, acetonitrile and ethanol were obtained. The process of dispersion of lyophilized NCC and NCC organogels (acetone, acetonitrile and ethanol) in water and in 11 organic solvents was investigated. The effect of the pH of the initial aqueous suspension of the NCC and the solvent forming the NCC organogel on the repeated dispersibility of the NCC is shown. The optimum pH value of the initial aqueous suspension of NCC was determined, which determines the maximum dispersibility of the lyophilized samples in each specific solvent. It was shown that dispersion of acetone, acetonitrile and ethanol organogels in most of the solvents studied occurs with the formation of particles less than 100 nm.

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Cellulose nanocrystals with different length-to-diameter ratios extracted from various plants using novel system acetic acid/phosphotungstic acid/octanol-1

Cited by 44 publications

References 35 publications

A Fenton-like System (Cu(II)/H₂O₂) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface

A Fenton-like System (Cu(II)/H₂O₂) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface

Printing of Colorful Cellulose Nanocrystalline Patterns Visible in Linearly Polarized Light

Dispersibility of Nanocrystalline Cellulose in Organic Solvents

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Cellulose nanocrystals with different length-to-diameter ratios extracted from various plants using novel system acetic acid/phosphotungstic acid/octanol-1

Cited by 44 publications

References 35 publications

A Fenton-like System (Cu(II)/H2O2) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface

A Fenton-like System (Cu(II)/H2O2) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface

Printing of Colorful Cellulose Nanocrystalline Patterns Visible in Linearly Polarized Light

Dispersibility of Nanocrystalline Cellulose in Organic Solvents

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A Fenton-like System (Cu(II)/H₂O₂) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface

A Fenton-like System (Cu(II)/H₂O₂) for the Preparation of Cellulose Nanocrystals with a Slightly Modified Surface