Initiating Highly Effective Hydrolysis of Regenerated Cellulose by Controlling Transition of Crystal Form with Sulfolane under Microwave Radiation

2016 ◽  
Vol 4 (3) ◽  
pp. 1507-1511 ◽  
Author(s):  
Na Teng ◽  
Jinping Ni ◽  
Haizhen Chen ◽  
Qinghua Ren ◽  
Haining Na ◽  
...  
Keyword(s):  
Microwave Radiation ◽  
Crystal Form ◽  
Regenerated Cellulose ◽  
Highly Effective ◽  
Hydrolysis Of

Structure of Regenerated Celluloses Treated with Ionic Liquids and Comparison of their Enzymatic Digestibility by Purified Cellulase Components

2012 ◽  
Vol 65 (11) ◽  
pp. 1491 ◽  
Author(s):  
Masahiro Mizuno ◽  
Shuji Kachi ◽  
Eiji Togawa ◽  
Noriko Hayashi ◽  
Kouichi Nozaki ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Crystal Form ◽  
Regenerated Cellulose ◽  
Cellulose Ii ◽  
Cellulose I ◽  
Acid Moiety ◽  
Amino Acid Moiety ◽  
Hydrolysis Of Cellulose ◽  
Hydrolysis Of ◽  
Disordered Chain

In this study, regenerated celluloses were prepared from microcrystalline cellulose (MCC) by treatment with three ionic liquids (ILs) having 1-ethyl-3-methylimidazolium (Emim) as the cation, and the IL N-(2-methoxyethyl)-N,N-diethyl-N-methylammonium alanine ([N221ME][Ala]), where the amino acid moiety is the anion. The crystal form of cellulose was transformed from cellulose I to cellulose II by dissolution with an IL and regeneration with anti-solvent. However, the crystallinity of the regenerated cellulose was different; the disordered chain region was increased in the order of [N221ME][Ala] < [Emim][OAc] < [Emim][DEP] < [Emim][Cl]. The monocomponent cellulase, especially endoglucanase, showed high hydrolyzing activity for regenerated cellulose compared with untreated cellulose. Furthermore, the degree of increase of hydrolyzing activity was almost coincident with the order of crystallinity. For the effective hydrolysis of cellulose treated with an IL, it is necessary to prepare the cellulase mixture containing an adequate ratio of each cellulase component according to crystal allomorph and the crystallinity of regenerated cellulose.

scholarly journals Correction: Surfactant-aided synthesis of RhCo nanoclusters as highly effective and recyclable catalysts for the hydrolysis of methylamine borane and dimethylamine borane

2021 ◽  
Vol 11 (8) ◽  
pp. 2965-2966
Author(s):  
Nihat Tunç ◽  
Murat Rakap
Keyword(s):  
Recyclable Catalysts ◽  
Highly Effective ◽  
Dimethylamine Borane ◽  
Hydrolysis Of

Correction for ‘Surfactant-aided synthesis of RhCo nanoclusters as highly effective and recyclable catalysts for the hydrolysis of methylamine borane and dimethylamine borane’ by Nihat Tunç et al., Catal. Sci. Technol., 2020, 10, 7865–7874, DOI: 10.1039/D0CY01472A.

scholarly journals A Facile Way for Preparation of Cellulose Beads With High Homogeneity, Low Crystallinity, and Tunable - Internal Structure

2021 ◽  
Author(s):  
Yuanyuan Xia ◽  
Xinping Li ◽  
Yue Yuan ◽  
Jingshun Zhuang ◽  
Wenliang Wang
Keyword(s):  
Crystal Form ◽  
Energy Storage Materials ◽  
Regenerated Cellulose ◽  
Protein Chromatography ◽  
Green Materials ◽  
Coagulation Mechanism ◽  
Structures And Properties ◽  
Water Holding ◽  
Water Alcohol ◽  
Low Crystallinity

Abstract The preparation of cellulose beads has attracted more and more attention in the application of advanced green materials. To obtain uniform and controllable cellulose beads, the dissolving pulp was dissolved in NMMO, and the cellulose beads were regenerated in various coagulation baths (water, alcohol, acid, NMMO, etc.) by phase conversion method. Results show that the crystal form of regenerated cellulose changes from cellulose I to cellulose II. NMMO swelling cellulose beads present low crystallinity and low water holding capacity. The coagulation mechanism of cellulose beads was clarified by a laser confocal microscopy. It is found that the whole coagulation process was from outside to inside gradually. It is a green and facile method for preparing cellulose beads with different structures and properties, which can be widely used in biomedicine, energy storage materials, and protein chromatography.

Surfactant-aided synthesis of RhCo nanoclusters as highly effective and recyclable catalysts for the hydrolysis of methylamine borane and dimethylamine borane

2020 ◽  
Vol 10 (23) ◽  
pp. 7865-7874
Author(s):  
Nihat Tunç ◽  
Murat Rakap
Keyword(s):  
Cost Saving ◽  
Highly Efficient ◽  
Recyclable Catalysts ◽  
Highly Effective ◽  
Dimethylamine Borane ◽  
Hydrolysis Of

In this study, the first ever and easy surfactant-aided synthesis of CTAB-stabilized Rh0.63Co0.37 and their employment as highly efficient, cost-saving, and recyclable catalysts to generate hydrogen from the hydrolysis of MeAB and DMAB are reported.

scholarly journals THE application of polymer radioabsorbing materials TO SOLVE THE problem of electromagnetic safety

2016 ◽  
pp. 9-13
Author(s):  
V. A. Bannyi ◽  
V. A. Ignatenko
Keyword(s):  
Composite Materials ◽  
Microwave Radiation ◽  
Polymer Composite ◽  
Phase State ◽  
Effective Means ◽  
Polymer Composite Materials ◽  
Biological Objects ◽  
Chiral Structures ◽  
Highly Effective ◽  
Electronic Microscope

Objective: to develop and create new absorbers of microwave radiation on polymer basis; to assess the perspectives of application of polymer composite radioabsorbing materials (RAM) and electromagnetic screens (EMS) for solving of the problem of electromagnetic ecology and electromagnetic protection of biological objects. Material and methods. Monolithic, fibrous and combined RAM based on filled thermoplastics were chosen as subjects of the study. Dielectric, magnetic and electroconducting substances different in nature, shape, size and a phase state were used as a filler. The RAM structure was study with means of a scanning electronic microscope. Results and discussion. The application of polymer composite materials for protection of biological objects from the effect of microwaves has been shown as efficient. The prospects for creation of polymer RAM, containing biodegradable components, nanoparticles, chiral structures, encapsulated liquids and also as non-woven RAM and polymers with own electroconductive have been analysed. Conclusion. RAM based on polymer composite thermoplastics and EMS are highly effective means for solving the problems of electromagnetic ecology.

scholarly journals Impact of the Incorporation of Nano-Sized Cellulose Formate on the End Quality of Polylactic Acid Composite Film

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Yidong Zhang ◽  
Chao Liu ◽  
Meiyan Wu ◽  
Zhenqiu Li ◽  
Bin Li
Keyword(s):  
Composite Film ◽  
Polylactic Acid ◽  
Composite Films ◽  
Crystallinity Index ◽  
Regenerated Cellulose ◽  
Fundamental Study ◽  
One Step ◽  
Hydrolysis Of ◽  
Better Than

Polylactic acid (PLA) films with good sustainable and biodegradable properties have been increasingly explored recently, while the poor mechanical property of PLA limits its further application. Herein, three kinds of nano-sized cellulose formate (NCF: cellulose nanofibril (CNF), cellulose nanocrystal (CNC), and regenerated cellulose formate (CF)) with different properties were fabricated via a one-step formic acid (FA) hydrolysis of tobacco stalk, and the influence of the properties of NCF with different morphologies, crystallinity index (CrI), and degree of substitution (DS) on the end quality of PLA composite film was systematically compared. Results showed that the PLA/CNC film showed the highest increase (106%) of tensile strength compared to the CNF- and CF-based films, which was induced by the rod-like CNC with higher CrI. PLA/CF film showed the largest increase (50%) of elongation at the break and more even surface, which was due to the stronger interfacial interaction between PLA and the CF with higher DS. Moreover, the degradation property of PLA/CNF film was better than that of other composite films. This fundamental study was very beneficial for the development of high-quality, sustainable packaging as an alternative to petroleum-based products.

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