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1. The fibrils untwisting limits the rate of cellulose nitration process

Author:
Nikolsky, Sergey N.; Zlenko, Dmitry V.; Melnikov, Valery P.; Stovbun, Sergey V.
Source:
Carbohydrate polymers 2019 v.204 pp. 232-237
ISSN:
0144-8617
Subject:
cellulose; cellulose microfibrils,   etc   ; molecular weight; nanofibers;     Show all 4 Subjects
Abstract:
... The rate of cellulose nitration is lower compared to the low molecular weight substances. Theoretical estimates assess that the rate of the nitrating agents’ diffusion cannot provide for the characteristic time of cellulose nitration, as the densely packed regions are too small. However, the electrostatic barrier between the nitrating mixture and the microcrystallites makes the latter inaccessible ...
DOI:
10.1016/j.carbpol.2018.10.019

2. Correction to: Isolation of xylans from bleached Eucalyptus kraft pulp by antisolvents precipitation

Author:
Marques, Ana Isabel; Serrano, Maria de Lurdes; Alves, Ana Maria Brites; de Sousa, António P. Mendes
Source:
Cellulose 2019 v.26 no.3 pp. 1993
ISSN:
0969-0239
Subject:
cellulose,   etc   ; Eucalyptus; kraft pulp;     Show all 3 Subjects
Abstract:
... Unfortunately, the word “FTIR” has been mistakenly included in the Acknowledgments, which needs to be removed. ...
DOI:
10.1007/s10570-019-02304-4

3. Pitfalls in the chemistry of cellulosic key chromophores

Author:
Hettegger, Hubert; Amer, Hassan; Zwirchmayr, Nele S.; Bacher, Markus; Hosoya, Takashi; Potthast, Antje; Rosenau, Thomas
Source:
Cellulose 2019 v.26 no.1 pp. 185-204
ISSN:
0969-0239
Subject:
cellulose,   etc   ; color; reaction mechanisms;     Show all 3 Subjects
Abstract:
... The chemistry of cellulosic key chromophores is challenging because of the usually very low concentration of the colored compounds in real-world cellulosic matrices. It offers many surprises and positive outcomes; unfortunately there are also pitfalls and disappointments. This report discusses eight examples or surprising chemistry out of the realm of cellulosic key chromophores. The reactions hav ...
DOI:
10.1007/s10570-018-2131-6

4. Preparation and properties of microfibrillated cellulose with different carboxyethyl content

Author:
Chen, Jing-Huan; Liu, Jin-Gang; Su, Yan-Qun; Xu, Ze-Hong; Li, Mei-Can; Ying, Rui-Feng; Wu, Jian-Quan
Source:
Carbohydrate polymers 2019 v.206 pp. 616-624
ISSN:
0144-8617
Subject:
cellulose; cellulose microfibrils,   etc   ; crystal structure; grinding; homogenization; moieties; polymerization;     Show all 7 Subjects
Abstract:
... Carboxyethyl reaction was used as a pretreatment method before grinding and homogenization to prepare microfibrillated cellulose (MFC). The effect of carboxyethylation on the properties of cellulose materials and prepared MFC samples were investigated. Results showed that cellulose materials with different carboxyethyl content were obtained by controlling the chemical dosage. This reaction increas ...
DOI:
10.1016/j.carbpol.2018.11.024

5. Reactive nanoparticles with activated ester moieties from cellulose acetate phthalate derivatives

Author:
Schulze, Peter; Gericke, Martin; Heinze, Thomas
Source:
Cellulose 2019 v.26 no.1 pp. 475-490
ISSN:
0969-0239
Subject:
cellulose; cellulose acetate,   etc   ; carbonates; drugs; fluorescent dyes; moieties; nanoparticles; phthalates;     Show all 8 Subjects
Abstract:
... Reactive polysaccharide (PS) based nanoparticles (NP) with activated N-hydroxysuccinimide (NHS) ester moieties were prepared by a two-step approach: (i) homogeneous synthesis of activated cellulose ester derivatives followed by (ii) nano-self-assembling of these derivatives into spherical PS-NP. Four different conversions of cellulose acetate phthalate (CAP) into cellulose acetate (N-succinimidyl) ...
DOI:
10.1007/s10570-018-2108-5

6. Rheology of microfibrillated cellulose (MFC) suspensions: influence of the degree of fibrillation and residual fibre content on flow and viscoelastic properties

Author:
Schenker, Michel; Schoelkopf, Joachim; Gane, Patrick; Mangin, Patrice
Source:
Cellulose 2019 v.26 no.2 pp. 845-860
ISSN:
0969-0239
Subject:
cellulose; cellulose microfibrils,   etc   ; fiber content; models; pulp; rheology; viscoelasticity; viscosity;     Show all 8 Subjects
Abstract:
... The influence of the degree of fibrillation (DoF), i.e. the fibril width distribution, on the rheological properties of microfibrilated cellulose (MFC) suspensions was investigated. To extend the understanding of the dominating effect of either fibril diameter alone or diameter size distribution, flow curves (viscosity against shear rate) and viscoelastic measurements were performed on single, dou ...
DOI:
10.1007/s10570-018-2117-4

7. Contribution of different state of adsorbed water to the sub-Tg dynamics of cellulose

Author:
Zhao, Hao; Chen, Zhen; Du, Xianfeng; Chen, Lin
Source:
Carbohydrate polymers 2019 v.210 pp. 322-331
ISSN:
0144-8617
Subject:
cellulose,   etc   ; bound water; dielectric spectroscopy;     Show all 3 Subjects
Abstract:
... The contribution of different states of adsorbed water to the sub-Tg dynamics of cellulose was investigated by means of dielectric spectroscopy in couple with LF-NMR. The distribution and hydration state of adsorbed water in cellulose were determined by LF-NMR, based on which the role that different state of adsorbed water plays in typical secondary dielectric relaxations is discussed in detail. T ...
DOI:
10.1016/j.carbpol.2019.01.087

8. Study on the wet-web strength and pressability of paper sheet during the press process with the addition of nano-fibrillated cellulose (NFC)

Author:
Lu, Zonghong; An, Xingye; Zhang, Hao; Guan, Min; Liu, Jing; Sun, Yiwei; Nie, Shuangxi; Cao, Haibing; Lu, Bin; Liu, Hongbin
Source:
Carbohydrate polymers 2019 v.210 pp. 332-338
ISSN:
0144-8617
Subject:
cellulose,   etc   ; absorption; drainage; energy; paper;     Show all 5 Subjects
Abstract:
... The properties of wet-web strength and pressability of base paper affect the frequency of sheet breaks and machine runnability during the paper-making process. In this paper, the effect of nano-fibrillated cellulose (NFC) on the wet-web strength and pressability of paper sheet during the press process of paper-making was explored. It was found that the tensile energy absorption (TEA) of the sample ...
DOI:
10.1016/j.carbpol.2019.01.083

9. Biodegradable PBAT-Based Nanocomposites Reinforced with Functionalized Cellulose Nanocrystals from Pseudobombax munguba: Rheological, Thermal, Mechanical and Biodegradability Properties

Author:
Pinheiro, I. F.; Ferreira, F. V.; Alves, G. F.; Rodolfo, A., Jr.; Morales, A. R.; Mei, L. H. I.
Source:
Journal of polymers and the environment 2019 v.27 no.4 pp. 757-766
ISSN:
1566-2543
Subject:
cellulose,   etc   ; biodegradability; nanocomposites; nanocrystals; polymers;     Show all 5 Subjects
Abstract:
... Cellulose nanocrystals (CNC) were isolated from Munguba (Pseudobombax munguba) fibers and then functionalized with octadecyl isocyanate. Nanocomposites based on poly(butylene adipate-co-terephthalate) (PBAT) were prepared with different concentrations of cellulose nanocrystals (3, 5 and 7 wt%). We show that the addition of functionalized CNC leads to PBAT-based nanocomposites with enhanced thermal ...
DOI:
10.1007/s10924-019-01389-z

10. Local Sensitivity Analysis of Kinetic Models for Cellulose Pyrolysis

Author:
Dong, Zhujun; Xie, Li; Yang, Yang; Bridgwater, Anthony V.; Cai, Junmeng
Source:
Waste and biomass valorization 2019 v.10 no.4 pp. 975-984
ISSN:
1877-2641
Subject:
cellulose,   etc   ; activation energy; kinetics; pyrolysis;     Show all 4 Subjects
Abstract:
... The first and nth order kinetic models are usually used to describe cellulose pyrolysis. In this work, the local sensitivities of the conversion and derivative conversion with respect to the frequency factor, the logarithm of the frequency factor, the activation energy and the reaction order for the first and nth order kinetic models are calculated by using the finite difference method. The result ...
DOI:
10.1007/s12649-017-0097-5

11. The analysis of the influence of the normal restitution coefficient model on calculated particles velocities by means of Eulerian-Lagrangian approach

Author:
Ludwig, Wojciech; Płuszka, Paweƚ
Source:
Powder technology 2019 v.344 pp. 140-151
ISSN:
0032-5910
Subject:
cellulose,   etc   ; computer simulation; models; powders;     Show all 4 Subjects
Abstract:
... The main aim of the research presented in the paper was to determine the sensitivity of the model describing the flow of the dispersed phase in the spout-fluid bed apparatus operating in a fast circulating dilute spout-fluid bed regime to the way of calculating the normal restitution coefficient during collisions of particles with the wall. On the basis of relevant literature, four models were sel ...
DOI:
10.1016/j.powtec.2018.12.004

12. Kinetic changes in cellulose properties during defibrillation into microfibrillated cellulose and cellulose nanofibrils by ultra-refining

Author:
Berto, Gabriela L.; Arantes, Valdeir
Source:
International journal of biological macromolecules 2019 v.127 pp. 637-648
ISSN:
0141-8130
Subject:
cellulose; cellulose microfibrils; cellulose nanofibers,   etc   ; Eucalyptus; crystal structure; energy; kraft pulp; surface area; thermal stability; viscosity;     Show all 10 Subjects
Abstract:
... Defibrillation of cellulose fibers can lead to the isolation of microfibrillated cellulose (MFC) or cellulose nanofibrils (CNF) with intrinsic properties suitable for various applications. However, to what extent these properties are preserved, enhanced, gained or lowered during defibrillation and how they are related remains unclear. In this study, a kinetic study of the ultra-refining of bleache ...
DOI:
10.1016/j.ijbiomac.2019.01.169

13. High-yield preparation of cellulose nanofiber by small quantity acid assisted milling in glycerol

Author:
Lu, Yingzhao; Yu, Juan; Ma, Jinxia; Wang, Zhiguo; Fan, Yimin; Zhou, Xiaofan
Source:
Cellulose 2019 v.26 no.6 pp. 3735-3745
ISSN:
0969-0239
Subject:
cellulose; cellulose fibrils; cellulose nanofibers,   etc   ; acid treatment; crystal structure; glycerol; hydrogen bonding; mechanical methods; milling; raw materials; sulfuric acid; temperature;     Show all 12 Subjects
Abstract:
... A method was developed for the high-yield preparation of cellulose nanofibers (CNFs) using glycerol and a small quantity of sulfuric acid with a colloid milling mechanical dispersion. The glycerol together with a small quantity of sulfuric acid was employed to break hydrogen bonds between cellulose fibrils, after which the excessively swelled cellulose bundles could be easily disassembled to nanos ...
DOI:
10.1007/s10570-019-02335-x

14. Secondary cell wall biosynthesis

Author:
Zhong, Ruiqin; Cui, Dongtao; Ye, Zheng‐Hua
Source:
Thenew phytologist 2019 v.221 no.4 pp. 1703-1723
ISSN:
0028-646X
Subject:
cellulose; cellulose microfibrils; cellulose synthase,   etc   ; acetylation; biosynthesis; cell walls; genes; glucomannans; lignin; plasma membrane; tracheary elements; xylan;     Show all 12 Subjects
Abstract:
... Contents Summary 1703 I. Introduction 1703 II. Cellulose biosynthesis 1705 III. Xylan biosynthesis 1709 IV. Glucomannan biosynthesis 1713 V. Lignin biosynthesis 1714 VI. Concluding remarks 1717 Acknowledgements 1717 References 1717 SUMMARY: Secondary walls are synthesized in specialized cells, such as tracheary elements and fibers, and their remarkable strength and rigidity provide strong mechanic ...
DOI:
10.1111/nph.15537

15. Self-assembly of bio-cellulose nanofibrils through intermediate phase in a cell-free enzyme system

Author:
Kim, Yeji; Ullah, Muhammad Wajid; Ul-Islam, Mazhar; Khan, Shaukat; Jang, Jae Hyun; Park, Joong Kon
Source:
Biochemical engineering journal 2019 v.142 pp. 135-144
ISSN:
1369-703X
Subject:
cellulose; cellulose nanofibers; cellulose synthase,   etc   ; culture media; liquid chromatography; monitoring; nanocomposites; polymers; scanning electron microscopy; tandem mass spectrometry;     Show all 10 Subjects
Abstract:
... The current study was aimed to investigate the synthesis and self-assembly of cellulose nanofibrils in in vitro environment through intermediate phase analysis and compare with the microbial cell system. The presence and stability of cellulose synthase and other essential enzymes were qualitatively validated through liquid chromatography–mass spectrometry/mass spectrometry linear trap quadrupole ( ...
DOI:
10.1016/j.bej.2018.11.017

16. Novel fabrication of high-modulus cellulose-based films by nanofibrillation under alkaline conditions

Author:
Abe, Kentaro
Source:
Carbohydrate polymers 2019 v.205 pp. 488-491
ISSN:
0144-8617
Subject:
cellulose; cellulose microfibrils; cellulose nanofibers,   etc   ; crystal structure; films (materials); hydrogels; hydrogen bonding; milling; modulus of elasticity; neutralization; sodium hydroxide;     Show all 11 Subjects
Abstract:
... We herein propose a novel continuous process for fabricating high-modulus films based on cellulose nanofibers. In place of a dissolution process, the pulps were mechanically disintegrated into nanofibers by ball-milling in an 8% NaOH solution. NaOH treatment loosened the hydrogen bonding between the cellulose microfibrils in the pulps, and a highly concentrated suspension (8%) of cellulose nanofib ...
DOI:
10.1016/j.carbpol.2018.10.069

17. Structure/function relationships in the rosette cellulose synthesis complex illuminated by an evolutionary perspective

Author:
Haigler, Candace H.; Roberts, Alison W.
Source:
Cellulose 2019 v.26 no.1 pp. 227-247
ISSN:
0969-0239
Subject:
cellulose; cellulose microfibrils; cellulose synthase,   etc   ; bacteria; biocompatible materials; cell walls; cytoplasm; embryophytes; manufacturing; plasma membrane; polymerization; proteins; sugars;     Show all 13 Subjects
Abstract:
... Cellulose microfibrils are a key component of plant cell walls, which in turn compose most of our renewable biomaterials. Consequently, there is considerable interest in understanding how cellulose microfibrils are made in living cells by the plant cellulose synthesis complex (CSC). This remarkable multi-subunit complex contains cellulose synthase (CESA) proteins, and it is often called a rosette ...
DOI:
10.1007/s10570-018-2157-9

18. TRM4 is essential for cellulose deposition in Arabidopsis seed mucilage by maintaining cortical microtubule organization and interacting with CESA3

Author:
Yang, Bo; Voiniciuc, Cătălin; Fu, Lanbao; Dieluweit, Sabine; Klose, Holger; Usadel, Björn
Source:
Thenew phytologist 2019 v.221 no.2 pp. 881-895
ISSN:
0028-646X
Subject:
cellulose; cellulose microfibrils; cellulose synthase,   etc   ; Arabidopsis thaliana; alleles; biosynthesis; cell walls; microtubules; mucilages; reverse genetics; seed coat; transgenes; tubulin;     Show all 13 Subjects
Abstract:
... The differentiation of the seed coat epidermal (SCE) cells in Arabidopsis thaliana leads to the production of a large amount of pectin‐rich mucilage and a thick cellulosic secondary cell wall. The mechanisms by which cortical microtubules are involved in the formation of these pectinaceous and cellulosic cell walls are still largely unknown. Using a reverse genetic approach, we found that TONNEAU1 ...
DOI:
10.1111/nph.15442

19. A carbon aerogel with super mechanical and sensing performances for wearable piezoresistive sensors

Author:
Zhuo, Hao; Hu, Yijie; Chen, Zehong; Peng, Xinwen; Liu, Linxiang; Luo, Qingsong; Yi, Jiwang; Liu, Chuanfu; Zhong, Linxin
Source:
Journal of materials chemistry A 2019 v.7 no.14 pp. 8092-8100
ISSN:
2050-7496
Subject:
cellulose,   etc   ; aerogels; carbon; compressibility; nanocrystals; nanosheets;     Show all 6 Subjects
Abstract:
... 3D carbon aerogels with high compressibility and elasticity hold great promise for applications in piezoresistive sensors and various wearable devices. MXenes are new 2D conductive alternatives to fabricate piezoresistive carbon aerogels. However, it's difficult to obtain MXene-based continuous macrostructures with individually lying MXene nanosheets due to their low aspect ratio. To solve this is ...
DOI:
10.1039/c9ta00596j

20. Evaluation of bulk compression using a discrete element procedure calibrated with data from triaxial compression experiments on single particles

Author:
Jonsson, Henrik; Alderborn, Göran; Frenning, Göran
Source:
Powder technology 2019 v.345 pp. 74-81
ISSN:
0032-5910
Subject:
cellulose acetate,   etc   ; equations; mathematical models; powders; prediction;     Show all 5 Subjects
Abstract:
... Confined compression of bimodal mixtures of nearly monodisperse spherical cellulose acetate (CA) particles (diameters 1.5 and 2.0 mm) was studied numerically with the discrete element method (DEM) and experimentally using a materials tester equipped with suitable tablet tooling. An extended truncated sphere contact model was used in the simulations, enabling them to be carried out to high relative ...
DOI:
10.1016/j.powtec.2018.12.090