Superelastic and flexible 3D printed waterborne polyurethane/cellulose nanofibrils structures

2021 ◽  
pp. 102107
Author(s):  
Yuan Chen ◽  
Zhengyang Yu ◽  
Hale Oguzlu ◽  
Jungang Jiang ◽  
MiJung Cho ◽  
...  
Keyword(s):  
Cellulose Nanofibrils ◽  
Waterborne Polyurethane ◽  
3D Printed

scholarly journals 3D printing of a bio-based ink made of cross-linked cellulose nanofibrils with various metal cations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
J. Benedikt Mietner ◽  
Xuehe Jiang ◽  
Ulrica Edlund ◽  
Bodo Saake ◽  
Julien R. G. Navarro
Keyword(s):  
3D Printing ◽  
Divalent Cations ◽  
Cellulose Nanofibrils ◽  
Three Dimensional ◽  
Metal Cations ◽  
Cross Link ◽  
Cellulose Pulp ◽  
Freeze Dried ◽  
3D Printed ◽  
Metallic Cations

AbstractIn this work, we present an approach to cross-link cellulose nanofibrils (CNFs) with various metallic cations (Fe3+, Al3+, Ca2+, and Mg2+) to produce inks suitable for three-dimensional (3D) printing application. The printability of each hydrogel ink was evaluated, and several parameters such as the optimal ratio of Mn+:TOCNF:H2O were discussed. CNF suspensions were produced by mechanical disintegration of cellulose pulp with a microfluidizer and then oxidized with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). Finally, metal cations were introduced to the deprotonated TEMPO-oxidized CNF (TOCNF) suspension to cross-link the nanofibrils and form the corresponding hydrogels. The performances of each gel-ink were evaluated by rheological measurements and 3D printing. Only the gels incorporated with divalent cations Ca2+ and Mg2+ were suitable for 3D printing. The 3D printed structures were freeze-dried and characterized with Fourier transform infrared spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM). The better interaction of the TOCNFs with the divalent metallic cations in terms of printability, the viscoelastic properties of the inks, and the variation trends owing to various metal cations and ratios are discussed.

scholarly journals Nanocellulose-Based Inks—Effect of Alginate Content on the Water Absorption of 3D Printed Constructs

2019 ◽  
Vol 6 (3) ◽  
pp. 65 ◽  
Author(s):  
Eduardo Espinosa ◽  
Daniel Filgueira ◽  
Alejandro Rodríguez ◽  
Gary Chinga-Carrasco
Keyword(s):  
Water Absorption ◽  
Moisture Absorption ◽  
Cellulose Nanofibrils ◽  
Three Dimensional ◽  
Wound Dressings ◽  
Cross Linking ◽  
Porous Structures ◽  
Freeze Dried ◽  
3D Printed ◽  
The Cross

2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) oxidized cellulose nanofibrils (CNF) were used as ink for three-dimensional (3D) printing of porous structures with potential as wound dressings. Alginate (10, 20, 30 and 40 wt%) was incorporated into the formulation to facilitate the ionic cross-linking with calcium chloride (CaCl2). The effect of two different concentrations of CaCl2 (50 and 100 mM) was studied. The 3D printed hydrogels were freeze-dried to produce aerogels which were tested for water absorption. Scanning Electronic Microscopy (SEM) pictures demonstrated that the higher the concentration of the cross-linker the higher the definition of the printed tracks. CNF-based aerogels showed a remarkable water absorption capability. Although the incorporation of alginate and the cross-linking with CaCl2 led to shrinkage of the 3D printed constructs, the approach yielded suitable porous structures for water and moisture absorption. It is concluded that the 3D printed biocomposite structures developed in this study have characteristics that are promising for wound dressings devices.

scholarly journals Effect of Cellulose Nanofibrils on the Properties of Jatropha Oil-Based Waterborne Polyurethane Nanocomposite Film

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1460
Author(s):  
Mohamad Ridzuan Amri ◽  
Chuah Teong Guan ◽  
Syeed Saifulazry Osman Al-Edrus ◽  
Faizah Md Yasin ◽  
Siti Fatahiyah Mohamad
Keyword(s):  
Thermal Properties ◽  
Nanocomposite Film ◽  
Cellulose Nanofibrils ◽  
Waterborne Polyurethane ◽  
Nanocomposite Films ◽  
Test Machine ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis ◽  
Jatropha Oil ◽  
Opening Method

The objective of this work was to study the influence of cellulose nanofibrils (CNF) on the physical, mechanical, and thermal properties of Jatropha oil-based waterborne polyurethane (WBPU) nanocomposite films. The polyol to produce polyurethane was synthesized from crude Jatropha oil through epoxidation and ring-opening method. The chain extender, 1,6-hexanediol, was used to improve film elasticity by 0.1, 0.25, and 0.5 wt.% of CNF loading was incorporated to enhance film performance. Mechanical performance was studied using a universal test machine as specified in ASTM D638-03 Type V and was achieved by 0.18 MPa at 0.5 wt.% of CNF. Thermal gravimetric analysis (TGA) was performed to measure the temperature of degradation and the chemical crosslinking and film morphology were studied using Fourier-transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). The results showed that when the CNF was incorporated, it was found to enhance the nanocomposite film, in particular its mechanical and thermal properties supported by morphology. Nanocomposite film with 0.5 wt.% of CNF showed the highest improvement in terms of tensile strength, Young’s modulus, and thermal degradation. Although the contact angle decreases as the CNF content increases, the effect on the water absorption of the film was found to be relatively small (<3.5%). The difference between the neat WPBU and the highest CNF loading film was not more than 1%, even after 5 days of being immersed in water.

scholarly journals 3D Printed Conductive Nanocellulose Scaffolds for the Differentiation of Human Neuroblastoma Cells

Cells ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 682 ◽  
Author(s):  
Matteo Bordoni ◽  
Erdem Karabulut ◽  
Volodymyr Kuzmenko ◽  
Valentina Fantini ◽  
Orietta Pansarasa ◽  
...  
Keyword(s):  
Cell Differentiation ◽  
Cellulose Nanofibrils ◽  
Neuroblastoma Cells ◽  
Neural Model ◽  
Human Neuroblastoma Cells ◽  
Human Neuroblastoma ◽  
3D Printed ◽  
Microscopy Techniques ◽  
Walled Carbon Nanotubes

We prepared cellulose nanofibrils-based (CNF), alginate-based and single-walled carbon nanotubes (SWCNT)-based inks for freeform reversible embedding hydrogel (FRESH) 3D bioprinting of conductive scaffolds. The 3D printability of conductive inks was evaluated in terms of their rheological properties. The differentiation of human neuroblastoma cells (SH-SY5Y cell line) was visualized by the confocal microscopy and the scanning electron microscopy techniques. The expression of TUBB3 and Nestin genes was monitored by the RT-qPCR technique. We have demonstrated that the conductive guidelines promote the cell differentiation, regardless of using differentiation factors. It was also shown that the electrical conductivity of the 3D printed scaffolds could be tuned by calcium–induced crosslinking of alginate, and this plays a significant role on neural cell differentiation. Our work provides a protocol for the generation of a realistic in vitro 3D neural model and allows for a better understanding of the pathological mechanisms of neurodegenerative diseases.

scholarly journals 3D Printing of a Bio-Based Ink Made of Cross-Linked Cellulose Nanofibrils With Various Metal Cations

2020 ◽  
Author(s):  
Jakob Mietner ◽  
Xuehe Jiang ◽  
Ulrica Edlund ◽  
Bodo Saake ◽  
Julien Navarro
Keyword(s):  
3D Printing ◽  
Divalent Cations ◽  
Cellulose Nanofibrils ◽  
Three Dimensional ◽  
Metal Cations ◽  
Cross Link ◽  
Cellulose Pulp ◽  
Freeze Dried ◽  
3D Printed ◽  
Metallic Cations

Abstract In this work, we present an approach to cross-link cellulose nanofibrils (CNFs) with various metallic cations (Fe3+, Al3+, Ca2+, and Mg2+) to produce inks suitable for three-dimensional (3D) printing application. The printability of each hydrogel ink was evaluated, and several parameters such as the optimal ratio of Mn+:TOCNF:H2O were discussed. CNF suspensions were produced by mechanical disintegration of cellulose pulp with a microfluidizer and then oxidized with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). Finally, metal cations were introduced to the deprotonated TEMPO-oxidized CNF (TOCNF) suspension to cross-link the nanofibrils and form the corresponding hydrogels. The performances of each gel-ink were evaluated by rheological measurements and 3D printing. Only the gels incorporated with divalent cations Ca2+ and Mg2+ were suitable for 3D printing. The 3D printed structures were freeze-dried and characterized with Fourier transform infrared spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM). The better interaction of the TOCNFs with the divalent metallic cations in terms of printability, the viscoelastic properties of the inks, and the variation trends owing to various metal cations and ratios are discussed.

3D Printed Models for Surgical Planning and Reconstructive Implant Design in Sphenoorbital Tumor Surgery

2016 ◽  
Vol 77 (S 02) ◽  
Author(s):  
Hassan Othman ◽  
Sam Evans ◽  
Daniel Morris ◽  
Saty Bhatia ◽  
Caroline Hayhurst
Keyword(s):  
Surgical Planning ◽  
Implant Design ◽  
Tumor Surgery ◽  
3D Printed

That which Is Unseen: A 3D-Printed Case-Based Didactic Approach to Teaching Pediatric Cerebrovascular Neurosurgery

2019 ◽  
Author(s):  
Avital Perry ◽  
Soliman Oushy ◽  
Lucas Carlstrom ◽  
Christopher Graffeo ◽  
David Daniels ◽  
...  
Keyword(s):  
3D Printed ◽  
Approach To Teaching ◽  
Case Based

Facile preparation of nanofiller-paper using mixed office paper without deinking

TAPPI Journal ◽  
2015 ◽  
Vol 14 (3) ◽  
pp. 167-174 ◽  
Author(s):  
QIANQIAN WANG ◽  
J.Y. ZHU
Keyword(s):  
Cellulose Nanofibrils ◽  
Ash Content ◽  
Raw Material ◽  
Mechanical Grinding ◽  
Microscope Imaging ◽  
Facile Preparation ◽  
Electron Microscope Imaging ◽  
Thermal Stability Of ◽  
Scanning Electron ◽  
Office Paper

Mixed office paper (MOP) pulp without deinking with an ash content of 18.1 ± 1.5% was used as raw material to produce nanofiller-paper. The MOP pulp with filler was mechanically fibrillated using a laboratory stone grinder. Scanning electron microscope imaging revealed that the ground filler particles were wrapped by cellulose nanofibrils (CNFs), which substantially improved the incorporation of filler into the CNF matrix. Sheets made of this CNF matrix were densified due to improved bonding. Specific tensile strength and modulus of the nanofiller-paper with 60-min grinding reached 48.4 kN·m/kg and 8.1 MN·m/kg, respectively, approximately 250% and 200% of the respective values of the paper made of unground MOP pulp. Mechanical grinding duration did not affect the thermal stability of the nanofiller-paper.

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