Anionic wood nanofibers produced from unbleached mechanical pulp by highly efficient chemical modification

Sirviö, Juho Antti; Visanko, Miikka

doi:10.1039/c7ta05668k

Cited by 85 publications

(52 citation statements)

References 45 publications

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“…The interaction between DES components allows them to be produced at temperature below melting point of either of components 31 The use of mechanical stirring can lower the temperature needed for DES production 32 and in some cases DES can be obtained even at room temperature by mild mixing. 33 Exclusion of the complicated synthetic routes and any additional chemicals (i.e. solvents and side-products) during their preparation makes DESs promising sustainable alternatives for ionic liquids and other more well-known solvents.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Nonetheless, cellulose is insoluble in most common solvents which restricts its processing. Therefore, cellulose is usually disintegrated into nanostructured cellulose for further application . As one kind of several nanocellulose, cellulose nanocrystals (CNCs) exhibit distinct properties, including high mechanical strength, aqueous dispersion stability, low thermal expansion coefficient, degradability and biocompatibility ,.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, cellulose is usually disintegrated into nanostructured cellulose for further application. [24][25][26][27][28] As one kind of several nanocellulose, cellulose nanocrystals (CNCs) exhibit distinct properties, including high mechanical strength, aqueous dispersion stability, low thermal expansion coefficient, degradability and biocompatibility. [29,30] More importantly, CNCs have outstanding film-formation character and optical transparency.…”

Section: Introductionmentioning

confidence: 99%

Flexible and Tailorable Alkylviologen/Cellulose Nanocrystals Composite Films for Sustainable Applications in Electrochromic Devices

Yang

Zhou

et al. 2018

ChemElectroChem

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The new, sustainable, and pro‐environmental electrochromic devices (ECDs) have attracted tremendous attention due to the current issues regarding energy sources consumption and environmental pollution. A free‐standing composite film, consisting of cellulose nanocrystals (CNCs) as biological matrix, viologen, and KCl, was prepared by a casting method. Such a composite film is flexible and can be tailored into various shapes for patterned applications. The viologen/KCl/CNCs film was sandwiched between two indium‐tin oxide (ITO) glasses to construct viologen‐based ECDs. The performance of the viologen‐based ECDs did not depend on the organic solvent. ECDs based on four kinds of viologens with different substituent groups exhibited distinct coloration response. Besides the nature of the substituent groups attached to the bipyridine rings, the presence of CNCs is a crucial factor that affects the electrochromic performance of ECDs. The dimethyl‐substituted viologen ECD has a fast response time (10 s for bleaching and 7.3 s for coloring). And for the dibenzyl‐substituted viologen, a low voltage of −2.2 V can drive the coloration of its ECDs. The diethyl‐substituted viologen ECD exhibits 30 % transmittance variation and good coloring/bleaching stability. The ability to be tailored and degradability of the composite film provides a feasible strategy for the sustainability of electrochromic displays.

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“…Then CNFs with the width of 13.0-19.3 nm were smoothly obtained through further mechanical nanofibrillation without clogging. A method for the preparation of anionic CNFs using DES as reaction medium was proposed by Sirvio and Visanko [90]. As is shown in Figure 16, the DES consisted of triethylmethylammonium chloride (TEMACl) and imidazole was liquid at room temperature.…”

Section: Deep Eutectic Solvent Pretreatmentsmentioning

confidence: 99%

Recent Strategies in Preparation of Cellulose Nanocrystals and Cellulose Nanofibrils Derived from Raw Cellulose Materials

Xie

Yang

2018

International Journal of Polymer Science

207

128

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The recent strategies in preparation of cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) were described. CNCs and CNFs are two types of nanocelluloses (NCs), and they possess various superior properties, such as large specific surface area, high tensile strength and stiffness, low density, and low thermal expansion coefficient. Due to various applications in biomedical engineering, food, sensor, packaging, and so on, there are many studies conducted on CNCs and CNFs. In this review, various methods of preparation of CNCs and CNFs are summarized, including mechanical, chemical, and biological methods. The methods of pretreatment of cellulose are described in view of the benefits to fibrillation.

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Anionic wood nanofibers produced from unbleached mechanical pulp by highly efficient chemical modification

Abstract: An easily produced deep eutectic solvent was used as an efficient reaction medium for the chemical modification of lignin-rich groundwood pulp to obtain highly charged anionic wood nanofibers.

Cited by 85 publications

References 45 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

Flexible and Tailorable Alkylviologen/Cellulose Nanocrystals Composite Films for Sustainable Applications in Electrochromic Devices

Recent Strategies in Preparation of Cellulose Nanocrystals and Cellulose Nanofibrils Derived from Raw Cellulose Materials

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