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

2019 ◽  
Vol 7 (2) ◽  
pp. 755-763 ◽  
Author(s):  
Juho Antti Sirviö
Keyword(s):  
Room Temperature ◽  
Deep Eutectic Solvent ◽  
Regenerated Cellulose ◽  
Mechanical Disintegration ◽  
Cellulose Nanoparticles

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

scholarly journals Synthesis of Quaternary Ammonium Room-Temperature Ionic Liquids and their Application in the Dissolution of Cellulose

2019 ◽  
Vol 9 (9) ◽  
pp. 1750 ◽  
Author(s):  
Yao-Hsuan Tseng ◽  
Yu-Yin Lee ◽  
Shih-Hsun Chen
Keyword(s):  
Ionic Liquids ◽  
Quaternary Ammonium ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Regenerated Cellulose ◽  
Exchange Reactions ◽  
Cellulose Films ◽  
Structural Regularity ◽  
Rapid Dissolution ◽  
Regenerated Cellulose Films

In this work, several kinds of quaternary ammonium-based room-temperature ionic liquids (QA RTILs) are synthesized by alkylation and ion-exchange reactions for the rapid dissolution of cellulose. The applications of cellulose materials have been limited due to their poor solubility in conventional organic solvents, because of a high degree of structural regularity and a large number of hydrogen bonds. The prepared ionic liquids were identified by nuclear magnetic resonance, elemental analysis, and liquid chromatography-mass spectrometry. The results indicated that N,N,N-triethylhexan-1-aminium acetate (N6222OAc), tetrahexylammonium acetate (N6666OAc), and N,N,N,N′,N′,N′-hexaethyldecane-1,10-diaminium acetate (C10(N222OAc)2) exhibited good cellulose-dissolution without any pretreatment. The regenerated cellulose films with a low degree of crystallization of the cellulose II phase were also prepared easily in this process using N6222OAc due to its polar and small cation. These QA RTILs can be used as non-derivatizing solvents for cellulose and can also be easily recycled because of their thermostable and nonvolatile properties.

Deep eutectic solvent-catalyzed Meyer–Schuster rearrangement of propargylic alcohols under mild and bench reaction conditions

2020 ◽  
Vol 56 (96) ◽  
pp. 15165-15168
Author(s):  
Nicolás Ríos-Lombardía ◽  
Luciana Cicco ◽  
Kota Yamamoto ◽  
José A. Hernández-Fernández ◽  
Francisco Morís ◽  
...  
Keyword(s):  
Room Temperature ◽  
Deep Eutectic Solvent ◽  
Reaction Times ◽  
Reaction Conditions ◽  
Propargylic Alcohols ◽  
First Time

Faster, milder, greener…better! The Meyer–Schuster rearrangement is disclosed for the first time in a deep eutectic solvent, namely FeCl3·6H2O/glycerol (3 : 1), enabling the reaction at room temperature, under air and with short reaction times.

Regenerated cellulose aerogel: Morphology control and the application as the template for functional cellulose nanoparticles

2020 ◽  
Vol 137 (38) ◽  
pp. 49127
Author(s):  
Yue Tang ◽  
Han‐Qing Wang ◽  
De‐Fa Hou ◽  
Huang Tan ◽  
Ming‐Bo Yang
Keyword(s):  
Morphology Control ◽  
Regenerated Cellulose ◽  
Cellulose Nanoparticles ◽  
Cellulose Aerogel

A Facile Approach to Prepare Regenerated Cellulose/Graphene Nanoplatelets Nanocomposite Using Room-Temperature Ionic Liquid

2012 ◽  
Vol 12 (7) ◽  
pp. 5233-5239 ◽  
Author(s):  
Shaya Mahmoudian ◽  
Mat Uzir Wahit ◽  
Muhammad Imran ◽  
A. F. Ismail ◽  
Harintharavimal Balakrishnan
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Graphene Nanoplatelets ◽  
Regenerated Cellulose

Ionic Liquid-Regenerated Cellulose Beads as Solid Support Matrices for Papain Immobilization

2012 ◽  
Vol 535-537 ◽  
pp. 2349-2352
Author(s):  
Song Kun Yao ◽  
Qiu Jin Li ◽  
Wei Zhang ◽  
Ji Xian Gong ◽  
Jian Fei Zhang
Keyword(s):  
Ionic Liquid ◽  
Enzyme Activity ◽  
Room Temperature ◽  
Immobilized Enzyme ◽  
Solid Support ◽  
Cross Linking ◽  
Regenerated Cellulose ◽  
Ester Hydrochloride ◽  
Imidazolium Chloride ◽  
Scanning Electron

A beads based on cellulose and the room temperature ionic liquid 1-butyl-3-methyl imidazolium chloride ([Bmim]Cl) was prepared. Regenerated cellulose beads were modified with silane, and characterized by scanning electron microscopy. Papain was immobilized on the beads used two different methods including glutaraldehyde and covalent cross-linking method. The immobilized enzyme activity of bead was determinated by BAEE (N-benzoyl- DL-arginine ethyl ester hydrochloride) determination. According to the enzyme activity and immobilization rate compared with covalent cross-linking method, glutaraldehyde cross-linking method is more suitable for amino-modified.

scholarly journals Study of Cellulose Interaction with Concentrated Solutions of Sulfuric Acid

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Michael Ioelovich
Keyword(s):  
Sulfuric Acid ◽  
High Power ◽  
Room Temperature ◽  
Regenerated Cellulose ◽  
Structure And Properties ◽  
Optimal Conditions ◽  
Initial Sample ◽  
Concentrated Solutions ◽  
Crystallinity Degree ◽  
20 Nm

The effect of the concentration of sulfuric acid (SA) and temperature on structure and properties of cellulose (MCC) had been studied. Investigations showed that solubility of the initial sample at the room temperature increased gradually in the range of the acid concentration from 50 to 60 wt.% SA. When SA concentration reached 65 wt.%, then MCC sample dissolved completely. Cellulose regenerated from 65 wt.% SA had an amorphized structure and was characterized by high enzymatic digestibility. At increased temperature, 45°C, solubility of MCC in SA was raised, while yield and DP decreased. After treatment of MCC with hot 50–60 wt.% SA, the crystallinity degree of the obtained cellulose samples changed slightly, and these samples retained mainly the CI crystalline polymorph. However, when SA concentration reached 65 wt.%, then regenerated cellulose had CII crystalline polymorph, reduced crystallinity degree, and low DP. Using optimal conditions of the acidic treatment (57–60 wt.% SA, T = 45°C; t=1 h) in combination with the high-power disintegration permitted obtaining the CI nanocrystalline cellulose particles (NCP) having sizes 150–200 × 10–20 nm with the heightened yield (65–70%). These NCP can be used, for example, as reinforcing nanofillers for various composites.

An extremely efficient and green method for the acylation of secondary alcohols, phenols and naphthols with a deep eutectic solvent as the catalyst

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98365-98368 ◽  
Author(s):  
Hai Truong Nguyen ◽  
Phuong Hoang Tran
Keyword(s):  
Room Temperature ◽  
Deep Eutectic Solvent ◽  
Solvent Free ◽  
Secondary Alcohols ◽  
Green Method ◽  
Solvent Free Conditions

An efficient and green method was developed for the acylation of secondary alcohols, phenols and naphthols using deep eutectic solvent [CholineCl][ZnCl2]3 as a catalyst at room temperature under solvent-free conditions.

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