Choline chloride-based deep eutectic solvent systems as a pretreatment for nanofibrillation of ramie fibers

Wang, Yu; Wang, Chaoyun; Yi, Yanliang; Zhou, Wanlai; Wang, Hongying; Yang, Yang; Tan, Zhijian

doi:10.1007/s10570-019-02290-7

Cited by 73 publications

(40 citation statements)

References 55 publications

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“…The ramie fibers were disintegrated by ball milling, the fibers being pretreated using choline chloride-based DESs with urea (1:1) and oxalic acid dihydrate (1:2) [123]. They found that the system contained oxalic acid is more suitable for obtaining CNFs.…”

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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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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“…The main chemical composition of the nanocelluloses from the spruce and beech were verified by ATR‐FTIR spectroscopy ( Figure a,b). The typical characteristic signals of cellulose [ 20 ] were found in the FTIR spectra of the PO–nanocelluloses. For instance, the absorbance peaks at around 3340 cm −1 (OH stretching vibration), 2900 cm −1 (CH symmetrical stretching), 1420 cm −1 (CH bending vibration), 1161 cm −1 (COC stretching vibration) and 1057 cm −1 (COC ring stretching vibration) were the main characteristic peaks of nanocelluloses in FTIR spectra.…”

Section: Resultsmentioning

confidence: 99%

Direct Preparation of Nanocelluloses of Tunable Lengths from Native Wood Via Alkaline Periodate Oxidation

Yang

Liu

et al. 2021

Advanced Sustainable Systems

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nontoxicity, [4] large availability due to the inexhaustible origin of raw materials, excellent mechanical properties with very high elastic modulus, [5] high aspect ratio showing specific anisotropic properties, abundant surface groups, the feasibility of forming specific chiral structures in aqueous suspensions, [6] tunable surface chemistry, [1,7] and amphiphilicity. [8] Therefore, they are emerging as sustainable and important candidates in many application scenarios. [9] Previous works on the method for preparation of nanocelluloses have made extraordinary progresses, [9] including mechanical refining, [10] chemical acid hydrolysis, [11] oxidation method, [12] and so on. [13] In these methods, mechanical refining generally consumes more energy to separate the cellulose-contained resource into nanocelluloses. On the other hand, the isolation via chemical acid hydrolysis, [11] or oxidation which include the 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO)-mediated oxidation and ammonium persulfate (APS) oxidation can reduce the energy consumption by 20 to 30 times for the preparation of the same amount of nanocelluloses. [14] Generally, CNFs with dimensions of 3-7 nm in diameter and 500-2000 nm in length can be prepared via TEMPO-mediated oxidation (TEMPO/NaClO/NaClO 2 with pH 4-7 and TEMPO/NaBr/NaClO with pH 10). [15] CNCs with the dimensions of 3-5 nm in diameter and 50-300 nm in length can be obtained via the methods of acid hydrolysis, [16] APS oxidation, [17] and TEMPO-mediated oxidation (TEMPO/ NaClO/NaClO 2 with pH 4.8). [18] Among these, CNFs and CNCs can be prepared by TEMPO-mediated oxidation method, however, it has to be assisted a homogenizer with high energy consumption (such as 300 W for 5 min). [15,18] It is also worth noting that the intense mechanical treatment is generally required after aforementioned acid hydrolysis and oxidation. As well, the starting materials for the isolation of nanocelluloses must be pretreated to separate the cellulose from the native matrix, e.g., softwood spruce and hardwood beech. Currently, it is highly desired to develop a facile method to prepare CNCs and CNFs via a one single method with low energy consumption and without big change of the method, when dealing with the possible complex market needs of CNFs and CNCs in the future.Here, we report a facile method to produce nanocelluloses by oxidizing native softwood spruce (SW) and hardwood beech (HW) via alkaline periodate oxidation (PO-nanocelluloses refers to both PO-CNFs and PO-CNCs from the alkaline periodate oxidation). The modification on the chemical structure of the Herein, cellulose nanofibers (PO-CNFs) and cellulose nanocrystals (PO-CNCs) are prepared directly from native softwood spruce and hardwood beech via the same alkaline periodate oxidation under equal conditions. PO-CNFs and PO-CNCs are obtained by simply regulating the reaction time between 2 and 7 d. Of particular note, the preparation of CNFs is achieved using the alkaline periodate oxidation. PO-CNFs obtained from spruce and beech ha...

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“…The TOCNF looked like a continuous irregular mesh of cellulose fibers, occasionally united in the thicker fibers with the average length of the thin fibers being about several hundred nanometers. The large interconnected pores of the cellulose network present in the TOCNF were a result of ice growth during freeze-drying (Yu et al 2019). Figure 8-9 shows the fiber length distribution and a TEM micrograph of the unoxidized cellulose fibers with a short, rod-like structure and many aggregates while that of TEMPO-oxidized fibers are depicted in Figure 9.…”

Section: Sem and Tem Micrographsmentioning

confidence: 99%

“…(Szczęsna-Antczak, Kazimierczak, and Antczak 2012). Moreover, recent research progress has led to the use of eutectic solvent and organic solid acids to isolate cellulose nanofibrils but utilization of these solvents is hampered by cost (Yu et al 2019;Bian, et al 2019b). The utilization of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) as a catalyst during oxidation with hypochlorite allows the introduction of a carboxylic group in the C 6 position on the surface of the fibers.…”

Section: Introductionmentioning

confidence: 99%

Isolation of Cellulose Nanofibers from Oryza sativa Residues via TEMPO Mediated Oxidation

Madivoli

Kareru

Gachanja

et al. 2020

Journal of Natural Fibers

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Cellulose nanocrystals (CNCs) or cellulose nanofibers (CNFs) with different morphologies, chemical, mechanical and physical properties can be obtained when microcrystalline cellulose is subjected to enzymatic, chemical or mechanical treatment. With the aim of utilizing cellulose nanofibrils (CNFs) from Oryza sativa, we isolated microcrystalline cellulose using the Kraft process, followed by successive fiber fibrillation using mechanical grinding, then (2,2,6,6-Tetrame thylpiperidin-1-yl)oxyl (TEMPO) mediated oxidation. Analysis of pulp fibers obtained after each treatment step revealed that fiber properties such as length, crystallinity and crystal size changed when the pulp was subjected to mechanical grinding, ultrasonication and TEMPO mediated oxidation. The degree of crystallinity of the fibers increased while crystal size and fiber length decreased after each treatment. TEMPO mediated oxidation led to a decrease in fiber length and an increase in degree of crystallinity of the fibers as compared to mechanical treatment and ultrasonication. It further introduced carboxyl functional groups (COOH) on the surface of the fibrils, which implies that the nanofibers obtained in this study could be further functionalized. Hence, TEMPO mediated oxidation offers the possibility of further chemical functionalization of cellulose nanofibers isolated from agricultural residues. 摘要微晶纤维素经酶、化学或机械处理后，可以获得具有不同形貌、化学性质、机械性质和物理性质的纤维素纳米晶体(CNCs)或纤维素纳米纤维 (CNFs). 为了利用来自水稻的纤维素纳米纤维(CNFs)，我们用牛皮纸法分离微晶纤维素，然后用机械研磨法连续纤维纤颤，然后(2,2,6,6-四甲基哌啶-1-基)氧化(TEMPO)介导氧化. 对每个处理步骤后得到的纸浆纤维进行分析，发现当纸浆经过机械研磨、超声波处理和TEMPO介导氧化处理后，纤维的长度、结晶度和晶体大小等特性发生了变化. 各处理后纤维结晶度均有所提高，晶粒尺寸和纤维长度均有所减小. 与机械处理和超声处理相比，TEMPO介导的氧化导致纤维长度缩短，纤维结晶度增加. 进一步在纤维表面引入羧基官能团(COOH)，说明本研究得到的纳米纤维可以进一步功能化. 因此，TEMPO介导氧化为进一步实现从农业残留物中分离的纤维素纳米纤维的化学功能化提供了可能.

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Choline chloride-based deep eutectic solvent systems as a pretreatment for nanofibrillation of ramie fibers

Cited by 73 publications

References 55 publications

Use of Deep Eutectic Solvents in Polymer Chemistry–A Review

Use of Deep Eutectic Solvents in Polymer Chemistry–A Review

Direct Preparation of Nanocelluloses of Tunable Lengths from Native Wood Via Alkaline Periodate Oxidation

Isolation of Cellulose Nanofibers from Oryza sativa Residues via TEMPO Mediated Oxidation

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