Biomimetic Foams of High Mechanical Performance Based on Nanostructured Cell Walls Reinforced by Native Cellulose Nanofibrils

2008 ◽  
Vol 20 (7) ◽  
pp. 1263-1269 ◽  
Author(s):  
Anna J. Svagan ◽  
My A. S. Azizi Samir ◽  
Lars A. Berglund
Keyword(s):  
Cell Walls ◽  
Mechanical Performance ◽  
Cellulose Nanofibrils ◽  
Native Cellulose

Self-aligned integration of native cellulose nanofibrils towards producing diverse bulk materials

Soft Matter ◽  
2011 ◽  
Vol 7 (19) ◽  
pp. 8804 ◽  
Author(s):  
Tsuguyuki Saito ◽  
Takehiko Uematsu ◽  
Satoshi Kimura ◽  
Toshiharu Enomae ◽  
Akira Isogai
Keyword(s):  
Cellulose Nanofibrils ◽  
Bulk Materials ◽  
Native Cellulose

scholarly journals Cellulose Nanofibrils Filled Poly(Lactic Acid) Biocomposite Filament for FDM 3D Printing

Molecules ◽  
2020 ◽  
Vol 25 (10) ◽  
pp. 2319 ◽  
Author(s):  
Qianqian Wang ◽  
Chencheng Ji ◽  
Lushan Sun ◽  
Jianzhong Sun ◽  
Jun Liu
Keyword(s):  
Thermal Stability ◽  
3D Printing ◽  
Fused Deposition Modeling ◽  
Mechanical Performance ◽  
Cellulose Nanofibrils ◽  
Poly Lactic Acid ◽  
Fused Deposition ◽  
Wide Range ◽  
The Matrix ◽  
Direct Digital Manufacturing

As direct digital manufacturing, 3D printing (3DP) technology provides new development directions and opportunities for the high-value utilization of a wide range of biological materials. Cellulose nanofibrils (CNF) and polylactic acid (PLA) biocomposite filaments for fused deposition modeling (FDM) 3DP were developed in this study. Firstly, CNF was isolated by enzymatic hydrolysis combined with high-pressure homogenization. CNF/PLA filaments were then prepared by melt-extrusion of PLA as the matrix and CNF as the filler. Thermal stability, mechanical performance, and water absorption property of biocomposite filaments and 3D-printed objects were analyzed. Findings showed that CNF increased the thermal stability of the PLA/PEG600/CNF composite. Compared to unfilled PLA FDM filaments, the CNF filled PLA biocomposite filament showed an increase of 33% in tensile strength and 19% in elongation at break, suggesting better compatibility for desktop FDM 3DP. This study provided a new potential for the high-value utilization of CNF in 3DP in consumer product applications.

Reinforcement of all-cellulose nanocomposite films using native cellulose nanofibrils

2014 ◽  
Vol 104 ◽  
pp. 143-150 ◽  
Author(s):  
Jiangqi Zhao ◽  
Xu He ◽  
Yaru Wang ◽  
Wei Zhang ◽  
Xinxing Zhang ◽  
...  
Keyword(s):  
Cellulose Nanofibrils ◽  
Nanocomposite Films ◽  
Native Cellulose

Enzymatic Hydrolysis of Native Cellulose Nanofibrils and Other Cellulose Model Films: Effect of Surface Structure

Langmuir ◽  
2008 ◽  
Vol 24 (20) ◽  
pp. 11592-11599 ◽  
Author(s):  
S. Ahola ◽  
X. Turon ◽  
M. Österberg ◽  
J. Laine ◽  
O. J. Rojas
Keyword(s):  
Enzymatic Hydrolysis ◽  
Surface Structure ◽  
Cellulose Nanofibrils ◽  
Native Cellulose ◽  
Hydrolysis Of ◽  
Effect Of Surface

Experimental study on in-plane compressive response of irregular honeycombs

2017 ◽  
Vol 52 (8) ◽  
pp. 1121-1135
Author(s):  
Youming Chen ◽  
Raj Das ◽  
Mark Battley
Keyword(s):  
Cell Wall ◽  
Cell Walls ◽  
Mechanical Performance ◽  
Three Dimensional ◽  
Compressive Load ◽  
Neighbouring Cell ◽  
Deformation And Failure ◽  
Compressive Response ◽  
A Cell ◽  
Foam Mechanics

Compared with regular honeycombs, irregular honeycombs are more representative of real foams, and thus more suitable for the study of foam mechanics. In this paper, the deformation and failure progression in the irregular honeycombs are investigated by analysing the images captured in order to gain an improved understanding on foam failure. Irregular honeycombs with varying cell wall thickness, cell size and cell shape were manufactured using a three-dimensional printer and tested under compression. The behaviour of irregular honeycombs is found to be different from that of regular honeycombs. In irregular honeycombs, cell walls start to fracture at some point, initially at a low speed from multiple locations. The global stress reaches its maximum value shortly after the first fracture of cell walls. Only a few cell walls buckle in the specimens with cells of irregular shape. Fracture is more likely to occur to thin and long cell walls aligned within a medium angle (around 30 to 60°) to the compressive load. However, the susceptibility of a cell wall is to fracture is also affected by its neighbouring cell walls. Strong and stiff neighbouring cell walls could shield load away and protect it from breaking. Because of this, it is better to think of a weak spot as a region, rather than an individual cell or cell wall. Overall, the more uniform cell wall size and thickness are, the better the mechanical performance of cellular solids is.

scholarly journals Inherently Distinctive Potentialities and Uses of Nanocellulose Based on its Nanoarchitecture

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 4438-4473
Author(s):  
Kojiro Uetani ◽  
Naliharifetra Jessica Ranaivoarimanana ◽  
Mayumi Hatakeyama ◽  
Takuya Kitaoka
Keyword(s):  
Thermal Expansion ◽  
Physicochemical Properties ◽  
Cell Walls ◽  
High Strength ◽  
Present Review ◽  
Light Weight ◽  
Functional Design ◽  
Native Cellulose ◽  
Low Thermal Expansion ◽  
Material Utilization

Native cellulose is mainly found in phytomass, such as trees and other plants. It has a regular hierarchical nanoarchitecture, in which the extended macromolecular chains are aligned and closely packed in parallel to form the crystalline nanofibrils of cell walls. In the context of material utilization, nanocellulose is a collective term for nano-ordered assemblies of cellulose chains. In recent times, it has been produced in large quantities from woody bioresources. In addition, nanocellulose has some fascinating physicochemical properties, such as high strength, light weight, transparency, birefringence, and low thermal expansion. These properties have enabled broad functional design of nanocellulose-based materials; but most of them are facing serious competition from various products that already exist. However, nanocellulose is not just a green alternative to existing materials. Rather, it is expected to make a profound difference in terms of pioneering novel functions. The present review focuses on the unexpected features of nanocellulose materials, triggered by details of the inherent nanoarchitecture of native cellulose.

scholarly journals Thermal Insulating and Mechanical Properties of Cellulose Nanofibrils Modified Polyurethane Foam Composite as Structural Insulated Material

Forests ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 200 ◽  
Author(s):  
Weiqi Leng ◽  
Biao Pan
Keyword(s):  
Thermal Conductivity ◽  
Polyurethane Foam ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Cellulose Nanofibrils ◽  
Thermal Insulating ◽  
Foaming Process ◽  
Wood Construction ◽  
Closed Cell ◽  
Foam Composite

Cellulose nanofibrils (CNF) modified polyurethane foam (PUF) has great potential as a structural insulated material in wood construction industry. In this study, PUF modified with spray-dried CNF was fabricated and the physical and mechanical performance were studied. Results showed that CNF had an impact on the foam microstructure by increasing the precursor viscosity and imposing resistant strength upon foaming. In addition, the intrinsic high mechanical strength of CNF imparted an extra resistant force against cells expansion during the foaming process and formed smaller cells which reduced the chance of creating defective cells. The mechanical performance of the foam composite was significantly improved by introducing CNF into the PUF matrix. Compared with the PUF control, the specific bending strength, specific tensile strength, and specific compression strength increased up to three-fold for the CNF modified PUF. The thermal conductivity of PUF composite was mainly influenced by the closed cell size. The introduction of CNF improved thermal insulating performance, with a decreased thermal conductivity from 0.0439 W/mK to 0.02724 W/mK.

Colloidal Ionic Assembly between Anionic Native Cellulose Nanofibrils and Cationic Block Copolymer Micelles into Biomimetic Nanocomposites

2011 ◽  
Vol 12 (6) ◽  
pp. 2074-2081 ◽  
Author(s):  
Miao Wang ◽  
Anna Olszewska ◽  
Andreas Walther ◽  
Jani-Markus Malho ◽  
Felix H. Schacher ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Cellulose Nanofibrils ◽  
Native Cellulose ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Multifunctional High-Performance Biofibers Based on Wet-Extrusion of Renewable Native Cellulose Nanofibrils

2011 ◽  
Vol 23 (26) ◽  
pp. 2924-2928 ◽  
Author(s):  
Andreas Walther ◽  
Jaakko V. I. Timonen ◽  
Isabel Díez ◽  
Antti Laukkanen ◽  
Olli Ikkala
Keyword(s):  
High Performance ◽  
Cellulose Nanofibrils ◽  
Native Cellulose ◽  
Wet Extrusion

scholarly journals Preparation and Characterization of Nanocomposite Films Containing Nano-Aluminum Nitride and Cellulose Nanofibrils

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1121 ◽  
Author(s):  
Shuangxi Nie ◽  
Yuehua Zhang ◽  
Linmao Wang ◽  
Qin Wu ◽  
Shuangfei Wang
Keyword(s):  
Thermal Stability ◽  
Aluminum Nitride ◽  
High Performance ◽  
Mechanical Performance ◽  
Cellulose Nanofibrils ◽  
Crystal Form ◽  
Mechanical Tests ◽  
Substrate Material ◽  
Nanocomposite Films ◽  
Sodium Chlorite

Nanocomposites consisting of cellulose nanofibrils (CNFs) and nano-aluminum nitride (AlN) were prepared using a simple vacuum-assisted filtration process. Bleached sugarcane bagasse pulp was treated with potassium hydroxide and sodium chlorite, and was subsequently ultra-finely ground and homogenized to obtain CNFs. Film nanocomposites were prepared by mixing CNFs with various AlN amounts (0–20 wt.%). X-ray diffraction revealed that the crystal form of CNF-AlN nanocomposites was different to those of pure CNFs and AlN. The mechanical performance and thermal stability of the CNF-AlN nanocomposites were evaluated through mechanical tests and thermogravimetric analysis, respectively. The results showed that the CNF-AlN nanocomposites exhibited excellent mechanical and thermal stability, and represented a green renewable substrate material. This type of nanocomposite could present great potential for replacing traditional polymer substrates, and could provide creative opportunities for designing and fabricating high-performance portable electronics in the near future.

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