Cellulose nanofibers from recycled and virgin wood pulp: A comparative study of fiber development

2020 ◽  
Vol 234 ◽  
pp. 115900 ◽  
Author(s):  
Shaun Ang ◽  
Victoria Haritos ◽  
Warren Batchelor
Keyword(s):  
Comparative Study ◽  
Cellulose Nanofibers ◽  
Wood Pulp ◽  
Fiber Development

Comparative study of paper and nanopaper properties prepared from bacterial cellulose nanofibers and fibers/ground cellulose nanofibers of canola straw

2013 ◽  
Vol 43 ◽  
pp. 732-737 ◽  
Author(s):  
Hossein Yousefi ◽  
Mehdi Faezipour ◽  
Sahab Hedjazi ◽  
Mohammad Mazhari Mousavi ◽  
Yoshio Azusa ◽  
...  
Keyword(s):  
Comparative Study ◽  
Bacterial Cellulose ◽  
Cellulose Nanofibers ◽  
Canola Straw

scholarly journals A COMPARATIVE STUDY OF CELLULOSE NANOWHISKERS (CNWs) AND CELLULOSE NANOFIBERS (CNFs)

2021 ◽  
Vol 55 (5-6) ◽  
pp. 501-510
Author(s):  
ZHIJUN HU ◽  
XINYU CAO ◽  
DALIANG GUO ◽  
YINCHAO XU ◽  
PING WU ◽  
...  
Keyword(s):  
Reaction Time ◽  
Comparative Study ◽  
Supercritical Co2 ◽  
Plant Biomass ◽  
Raw Materials ◽  
Cellulose Nanofibers ◽  
Raw Material ◽  
Cellulose Nanowhiskers ◽  
Sem Images ◽  
Economic Output

Cellulose nanowhiskers (CNWs) from plant biomass are of considerable interest, primarily due to their low density, biodegradability, mechanical strength, economic output, and renewability. Here, a new pretreatment method has been developed to produce CNWs based on supercritical CO2 and ethanol. The raw material was micro-fibrillated cellulose (MFC) and experimental factors were controlled to enhance the properties of CNWs produced using a ball-milling technique following supercritical CO2 pretreatment. Cellulose nanofibers (CNFs) were also prepared using a high-pressure Microfluidizer©. A comparative study was conducted of the properties of the raw materials, the CNWs and the CNFs. The solid yields of P-MFC after supercritical CO2 pretreatment gradually decreased, along with the temperature and the reaction time. Scanning electron microscopy (SEM) images of the CNWs and CNFs show that the morphology of the CNWs was basically acicular, while that of the CNFs was mainly soft fibrous. Thermogravimetric analysis results suggest that the thermal stability of the CNWs was substantially higher than those of the CNFs and the raw material. XRD results indicate that the crystallinity showed an initial increasing trend and then declined with increasing temperature and reaction time, and the crystallinity value of CNWs was higher than that of CNFs. The smaller CNWs became rougher and had a larger surface area.

Oxidative treatments for cellulose nanofibers production: a comparative study between TEMPO-mediated and ammonium persulfate oxidation

Cellulose ◽  
2020 ◽  
Vol 27 (18) ◽  
pp. 10671-10688
Author(s):  
Inese Filipova ◽  
Ferran Serra ◽  
Quim Tarrés ◽  
Pere Mutjé ◽  
Marc Delgado-Aguilar
Keyword(s):  
Comparative Study ◽  
Cellulose Nanofibers ◽  
Ammonium Persulfate ◽  
Persulfate Oxidation

Comparative study of stone-ground wood pulp and native wood 2. Comparison of the fluorescence of stone-ground wood pulp and native wood

1994 ◽  
Vol 81 (2) ◽  
pp. 117-122 ◽  
Author(s):  
Alain Castellan ◽  
Hasneen Choudhury ◽  
R. Stephen Davidson ◽  
Stéphane Grelier
Keyword(s):  
Comparative Study ◽  
Wood Pulp

scholarly journals A Comparative Study on the Characterization of Nanofibers with Cellulose I, I/II, and II Polymorphs from Wood

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 153 ◽  
Author(s):  
Haiying Wang ◽  
Suiyi Li ◽  
Tiantian Wu ◽  
Xiaoxuan Wang ◽  
Xudong Cheng ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Comparative Study ◽  
Coefficient Of Thermal Expansion ◽  
Cellulose Nanofibers ◽  
High Yield ◽  
Chemical Extraction ◽  
Cellulose Content ◽  
Cellulose I ◽  
Aspect Ratios

Polymorphic changes in cellulose nanofibers (CNFs) are closely related to their properties and applications, and it is of interest to investigate how polymorphic changes influence their properties. A comparative study on the properties of CNFs with cellulose I, I/II, and II polymorphs from wood was conducted herein. CNFs were obtained by chemical extraction combined with a simple and efficient mechanical treatment (one pass through a grinder). This process resulted in a relatively high yield of 80–85% after a simple grinding treatment. The polymorphic changes in the CNFs and the chemical composition, morphology, tensile performances, and thermal properties were systematically characterized and compared. The X-ray diffraction and FTIR analyses verified the existence of three types of purified pulps and CNFs with cellulose I, cellulose I/II, and cellulose II polymorphs (CNF-I, CNF-I/II, CNF-II). Morphological observations presented that these three types of CNFs all exhibited high aspect ratios and entangled structures. Tensile testing showed that the CNF films all exhibited high tensile strengths, and the fracture strains of the CNF-I/II (11.8%) and CNF-II (13.0%) films were noticeably increased compared to those of the CNF-I film (6.0%). If CNF-II is used as reinforcing material, its larger fracture strain can improve the mechanical performance of the CNF composites, such as fracture toughness and impact strength. In addition, CNF-I, CNF-I/II, and CNF-II films showed very low thermal expansion in the range 20–150 °C, with the coefficient of thermal expansion values of 9.4, 17.1, and 17.3 ppm/K, respectively. Thermogravimetric analysis (TGA) revealed that the degradation temperature of CNF-I and CNF-II was greater than that of CNF-I/II, which was likely due to increased α-cellulose content. This comparative study of the characterization of CNF-I, CNF-I/II, and CNF-II provides a theoretical basis for the application of CNFs with different polymorphs and could broaden the applications of CNFs.

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