Rheology and tribology of nanocellulose-based biodegradable greases: Wear and friction protection mechanisms of cellulose microfibrils

Ilyin, Sergey O.; Gorbacheva, Svetlana N.; Yadykova, Anastasiya Y.

doi:10.1016/j.triboint.2022.108080

Cited by 33 publications

(19 citation statements)

References 81 publications

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“…This noteworthy increase in viscosity at the low shear rate in C3 was because the fibers were well dispersed in the matrix and had formed networks. Only C3 generated these networks because the increase of the CNF concentration led to binding and the creation of a structural percolation network [ 32 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

Preventing the Collapse Behavior of Polyurethane Foams with the Addition of Cellulose Nanofiber

Lee

Shin

et al. 2023

Polymers

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Polyurethane foam manufacturing depends on its materials and processes. A polyol that contains primary alcohol is very reactive with isocyanate. Sometimes, this may cause unexpected problems. In this study, a semi-rigid polyurethane foam was fabricated; however, its collapse occurred. The cellulose nanofiber was fabricated to solve this problem, and a weight ratio of 0.25, 0.5, 1, and 3% (based on total parts per weight of polyols) of the nanofiber was added to the polyurethane foams. The effect of the cellulose nanofiber on the polyurethane foams’ rheological, chemical, morphological, thermal, and anti-collapse performances was analyzed. The rheological analysis showed that 3 wt% of the cellulose nanofiber was unsuitable because of the aggregation of the filler. It was observed that the addition of the cellulose nanofiber showed the improved hydrogen bonding of the urethane linkage, even if it was not chemically reacted with the isocyanate groups. Moreover, due to the nucleating effect of the cellulose nanofiber, the average cell area of the produced foams decreased according to the amount of the cellulose nanofiber present, and the average cell area especially was reduced about five times when it contained 1 wt% more of the cellulose nanofiber than the neat foam. Although the thermal stability declined slightly, the glass transition temperature shifted from 25.8 °C to 37.6, 38.2, and 40.1 °C by when the cellulose nanofiber increased. Furthermore, the shrinkage ratio after 14 days from the foaming (%shrinkage) of the polyurethane foams decreased 15.4 times for the 1 wt% cellulose nanofiber polyurethane composite.

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Section: Resultsmentioning

confidence: 99%

Preventing the Collapse Behavior of Polyurethane Foams with the Addition of Cellulose Nanofiber

Lee

Shin

et al. 2023

Polymers

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“…The viscosity of the freshly prepared emulsions increased significantly ( p ≤ 0.05) with increasing the NFC concentration from 0.3 to 0.7 wt% ( Table 1 ), indicating that the network-like 3D structure of NFC in the aqueous phase formed a large amount of enmeshment of cellulose [ 39 ] with the increasing NFC concentration, which prevented the coalescence of droplets. In addition, the increase in NFC concentration could play an important role in improving the stability of the emulsions due to an increase in the yield stress ( Figure 1 ) of an aqueous phase in the emulsions leading to a stronger 3D network in the aqueous phase [ 32 ] and other benefits resulting from the increase in NFC concentration for the encapsulation of the lipid droplets [ 40 , 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

Astaxanthin-Loaded Pickering Emulsions Stabilized by Nanofibrillated Cellulose: Impact on Emulsion Characteristics, Digestion Behavior, and Bioaccessibility

et al. 2023

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Astaxanthin (AX) is one of the major bioactives that has been found to have strong antioxidant properties. However, AX tends to degrade due to its highly unsaturated structure. To overcome this problem, a Pickering O/W emulsion using nanofibrillated cellulose (NFC) as an emulsifier was investigated. NFC was used because it is renewable, biodegradable, and nontoxic. The 10 wt% O/W emulsions with 0.05 wt% AX were prepared with different concentrations of NFC (0.3–0.7 wt%). After 30 days of storage, droplet size, ζ-potential values, viscosity, encapsulation efficiency (EE), and color were determined. The results show that more stable emulsions are formed with increasing NFC concentrations, which can be attributed to the formulation of the NFC network in the aqueous phase. Notably, the stability of the 0.7 wt% NFC-stabilized emulsion was high, indicating that NFC can improve the emulsion’s stability. Moreover, it was found that fat digestibility and AX bioaccessibility decreased with increasing NFC concentrations, which was due to the limitation of lipase accessibility. In contrast, the stability of AX increased with increasing NFC concentrations, which was due to the formation of an NFC layer that acted as a barrier and prevented the degradation of AX during in vitro digestion. Therefore, high concentrations of NFC are useful for functional foods delivering satiety instead of oil-soluble bioactives.

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“…Nanocellulose-based materials are very attractive for 3D bioprinting due to the unique characteristics of cellulose, namely printability, mechanical strength, biocompatibility, biodegradability, and high cell viability [ 195 , 196 , 197 , 198 ]. At high shear rates, nanocellulose chains in suspension align and form shear-thinning or shear-thickening thixotropic systems with rapid recovery [ 199 , 200 , 201 ].…”

Section: Rheology As a Prerequisite For Bioink Formulation And Optimi...mentioning

confidence: 99%

Rheology as a Tool for Fine-Tuning the Properties of Printable Bioinspired Gels

Bercea¹

2023

Molecules

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Over the last decade, efforts have been oriented toward the development of suitable gels for 3D printing, with controlled morphology and shear-thinning behavior in well-defined conditions. As a multidisciplinary approach to the fabrication of complex biomaterials, 3D bioprinting combines cells and biocompatible materials, which are subsequently printed in specific shapes to generate 3D structures for regenerative medicine or tissue engineering. A major interest is devoted to the printing of biomimetic materials with structural fidelity after their fabrication. Among some requirements imposed for bioinks, such as biocompatibility, nontoxicity, and the possibility to be sterilized, the nondamaging processability represents a critical issue for the stability and functioning of the 3D constructs. The major challenges in the field of printable gels are to mimic at different length scales the structures existing in nature and to reproduce the functions of the biological systems. Thus, a careful investigation of the rheological characteristics allows a fine-tuning of the material properties that are manufactured for targeted applications. The fluid-like or solid-like behavior of materials in conditions similar to those encountered in additive manufacturing can be monitored through the viscoelastic parameters determined in different shear conditions. The network strength, shear-thinning, yield point, and thixotropy govern bioprintability. An assessment of these rheological features provides significant insights for the design and characterization of printable gels. This review focuses on the rheological properties of printable bioinspired gels as a survey of cutting-edge research toward developing printed materials for additive manufacturing.

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Rheology and tribology of nanocellulose-based biodegradable greases: Wear and friction protection mechanisms of cellulose microfibrils

Cited by 33 publications

References 81 publications

Preventing the Collapse Behavior of Polyurethane Foams with the Addition of Cellulose Nanofiber

Preventing the Collapse Behavior of Polyurethane Foams with the Addition of Cellulose Nanofiber

Astaxanthin-Loaded Pickering Emulsions Stabilized by Nanofibrillated Cellulose: Impact on Emulsion Characteristics, Digestion Behavior, and Bioaccessibility

Rheology as a Tool for Fine-Tuning the Properties of Printable Bioinspired Gels

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