Fabrication of regenerated cellulose nanoparticles by mechanical disintegration of cellulose after dissolution and regeneration from a deep eutectic solvent

Sirviö, Juho Antti

doi:10.1039/c8ta09959f

Cited by 74 publications

(41 citation statements)

References 67 publications

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“…DESs are generally considered solvents with a high dissolution capacity regarding many organic and inorganic components, 43 and as stated above, CCIMI has previously been used to dissolve starch. In addition, some DESs are known to dissolve cellulose, 44 especially low molecular weight microcrystalline cellulose. 45,46 From the XRD crystallography results, it can be seen that the crystalline structure of cellulose remained similar to the original cellulose pulp-that is, cellulose I (Fig.…”

Section: Characterization Of Des-treated Cellulose Fibermentioning

confidence: 99%

High-strength cellulose nanofibers producedviaswelling pretreatment based on a choline chloride–imidazole deep eutectic solvent

et al. 2020

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A deep eutectic solvent (DES) based on choline chloride and imidazole (CCIMI) was investigated for swelling of cellulose fibers prior to mechanical disintegration into cellulose nanofibers (CNFs). The dimensions of the DES treated and washed fibers were investigated after various treatment conditions (time, temperature, and cellulose consistency) using DES based on choline chloride-urea (CCUrea) and pure imidazole as references. Even mild treatment conditions (15 minutes at 60°C) with CCIMI increased the diameter of the fibers from 18.1 to 18.9 μm, and a maximum diameter of 19.9 μm was obtained after three hours at 100°C. Overall, CCIMI resulted in a higher degree of swelling compared to both references. In addition, pure imidazole caused a decrease in the degree of polymerization of cellulose, whereas cellulose degradation in CCIMI was negligible. The mechanical disintegration of CCIMI-treated fibers resulted in the production of CNF films with very good mechanical properties-specific tensile strength and work capacity being over 200 kNm kg −1 and 10 kJ kg −1 , respectively-whereas CNFs films produced using choline chloride-urea had notably lower values (182 kNM kg −1 and 7 kJ kg −1 , respectively). In addition, CNF films exhibited good oxygen barrier properties, even at an elevated relative humidity level (80%). CCIMI could be recycled without any effect on the mechanical properties of CNF films. The results presented here indicate CCIMI is a highly efficient pretreatment media for swelling and further nanofibrillation of cellulose, even at mild treatment conditions. † Electronic supplementary information (ESI) available: Fiber width and CWT at various concentrations, DRIFT spectra, photograph of CNF aerogels, and TGA curves. See

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Section: Characterization Of Des-treated Cellulose Fibermentioning

confidence: 99%

High-strength cellulose nanofibers producedviaswelling pretreatment based on a choline chloride–imidazole deep eutectic solvent

et al. 2020

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“…To dissolve the pulp or microcrystalline cellulose, in [119] a system consisting of (anhydrous) phosphoric acid and guanidine hydrochloride (2:1) was applied. After the dissolution (time 24 h, hydro modulus (1:20)) desintegrated cellulose was regenerated by a microfluidizer (1 min), and the dispersion passed through chambers (400, 200, 87 µm) several times at different pressures.…”

Section: Deep Eutectic Solvents For Isolation Of Nanocellulosementioning

confidence: 99%

“…It was attempted to reach the direct change in cellulose properties using sulfamic acid and urea in different molar ratios (1:2, 1:3, and 1:4). Simultaneously, the sulfamic acid to cellulose ratio was changed from 10: 1, through 6:1, to 3:1 [119]. As a result, DES caused a decrease of DP by up to 17–46% (initial DP of pulp 1822).…”

Section: Deep Eutectic Solvents For Isolation Of Nanocellulosementioning

confidence: 99%

Use of Deep Eutectic Solvents in Polymer Chemistry–A Review

2019

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This review deals with two overlapping issues, namely polymer chemistry and deep eutectic solvents (DESs). With regard to polymers, specific aspects of synthetic polymers, polymerization processes producing such polymers, and natural cellulose-based nanopolymers are evaluated. As for DESs, their compliance with green chemistry requirements, their basic properties and involvement in polymer chemistry are discussed. In addition to reviewing the state-of-the-art for selected kinds of polymers, the paper reveals further possibilities in the employment of DESs in polymer chemistry. As an example, the significance of DES polarity and polymer polarity to control polymerization processes, modify polymer properties, and synthesize polymers with a specific structure and behavior, is emphasized.

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“…There is possibility that mixing of carbamides with TEAOH would result in the formation of a deep eutectic solvent (DES) type of a solvent. Although there is only limited information on DESs that could dissolve cellulose (Kostag et al 2018;Sirviö 2019), DESs are proposed as an alternative solvent for ionic liquids, as they both have good dissolution ability toward many chemicals. It is well known that carbamides such as urea (Abbott et al 2003 Fig.…”

Section: Dissolution Mechanism Of Cellulosementioning

confidence: 99%

Room-temperature dissolution and chemical modification of cellulose in aqueous tetraethylammonium hydroxide–carbamide solutions

Sirviö

Heiskanen

2019

Cellulose

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The room-temperature dissolution of cellulose in aqueous tetraethylammonium hydroxide (TEAOH) in the presence of carbamides (ureas) was investigated. Without carbamide, 35 wt% TEAOH was able to dissolve cellulose (microcrystalline cellulose) up to 3 wt%, whereas carbamides-such as urea, N-methylurea, N-ethylurea, 1,3-dimethylurea, and imidazolidone-were able to improve the dissolution of cellulose. At 5 wt% cellulose concentration, the highest carbamide contents in the solvent still able to dissolve cellulose within 1 h were 56 and 55 wt% of 1,3-dimethylurea and N-methylurea, respectively. When using urea, up to 15% of cellulose could be dissolved in a solution containing 22 wt% of urea. To demonstrate the possibility of the use of a carbamidebased solvent in cellulose modification, cationic cellulose was produced using glycidyltrimethylammonium chloride (GTAC). At a molar ratio of 1:3 of cellulose and GTAC, all the studied TEAOH-carbamide solvents produce cationic cellulose with higher charge density compared to the reference NaOH-urea solvent.

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Fabrication of regenerated cellulose nanoparticles by mechanical disintegration of cellulose after dissolution and regeneration from a deep eutectic solvent

Abstract: Regenerated cellulose nanoparticles were produced by mechanical disintegration of regenerated cellulose obtained from room temperature dissolution in a deep eutectic solvent.

Cited by 74 publications

References 67 publications

High-strength cellulose nanofibers producedviaswelling pretreatment based on a choline chloride–imidazole deep eutectic solvent

High-strength cellulose nanofibers producedviaswelling pretreatment based on a choline chloride–imidazole deep eutectic solvent

Use of Deep Eutectic Solvents in Polymer Chemistry–A Review

Room-temperature dissolution and chemical modification of cellulose in aqueous tetraethylammonium hydroxide–carbamide solutions

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