A novel method for producing cellulose nanoparticles and their possible application as thickeners for biodegradable low-temperature greases

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

doi:10.1007/s10570-021-04166-1

Cited by 16 publications

(4 citation statements)

References 91 publications

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“…[14][15][16][17] Nevertheless, some limitations concerning the compatibility with the base oil, the physical stability, the temperature resistance, or the need to chemically modify these biopolymers to improve these drawbacks have not yet been fully addressed. Some authors [17][18][19] pointed out that native cellulose, i.e., non-chemically modified, can be effectively used as thickener in lubricating greases in the form of nanoparticles or microfibrils and emphasized the role of the base oil to provide stability of thickener particles against aggregation and sedimentation. Thus, for non-modified cellulose, polar base oils such as triethyl citrate or di (2-ethylhexyl) sebacate are preferred.…”

Section: Introductionmentioning

confidence: 99%

Oleo‐Dispersions of Electrospun Cellulose Acetate Butyrate Nanostructures: Toward Renewable Semisolid Lubricants

Martín‐Alfonso,

Rubio‐Valle,

Martín‐Alfonso

et al. 2024

Advanced Sustainable Systems

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In this work, the electrospinnability of cellulose acetate butyrate (CAb) solutions, and the ability of the resulting micro‐ and nano‐architectures to structure castor oil are studied aiming to develop eco‐friendly lubricating greases. Particles, beaded‐fibers, defect‐free fibers, and porous nanostructures are successfully prepared by dissolving CAb in N,N‐dimethylacetamide/acetone (DMAc:Ac, 1:2 w/w) and methylene chloride/acetone (DM:Ac, 1:1 w/w) solvent mixtures at different concentrations (2.5–15 wt.%). The formation of bead‐free nanofibers is favored at concentration above 10 wt.%, when solutions achieve relaxation times of ≈50 ms and shear‐thinning in extensional and shear flow tests, respectively. Non‐porous and porous CAb nanostructures are successfully used as castor oil thickeners at concentrations of 3–5 wt.%, leading a wide variety of rheological responses which mimic those of traditional semisolid lubricants. The surface properties of the nanofibers have a significant impact on the wear and friction performance in metal–metal contact, which has been associated with the oil release ability of the generated 3D network. Oleo‐dispersions prepared with smooth fibers show tribological performance comparable to, or even better than, commercial lithium greases. Overall, this study reveals the potential of CAb electrospun nanostructures for the development of next‐generation renewable semisolid lubricant formulations.

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Section: Introductionmentioning

confidence: 99%

Oleo‐Dispersions of Electrospun Cellulose Acetate Butyrate Nanostructures: Toward Renewable Semisolid Lubricants

Martín‐Alfonso,

Rubio‐Valle,

Martín‐Alfonso

et al. 2024

Advanced Sustainable Systems

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“…Irrespective of collagen concentration, the absence of zero-shear viscosity followed by subsequent yielding of the collagen network in response to the applied shear indicated characteristic viscoplastic behavior. Viscosity versus shear stress plots ( Figure 1 b) helped determine the yield stress of the gels, characterized as the region at which viscosity showed a rapid decrease as a function of shear stress [ 41 ]. The increase in collagen concentration resulted in an increase in yield stress ( Figure 1 c).…”

Section: Resultsmentioning

confidence: 99%

3D Printing Type 1 Bovine Collagen Scaffolds for Tissue Engineering Applications—Physicochemical Characterization and In Vitro Evaluation

Nayak

Tovar

Khan

et al. 2023

Gels

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Collagen, an abundant extracellular matrix protein, has shown hemostatic, chemotactic, and cell adhesive characteristics, making it an attractive choice for the fabrication of tissue engineering scaffolds. The aim of this study was to synthesize a fibrillar colloidal gel from Type 1 bovine collagen, as well as three dimensionally (3D) print scaffolds with engineered pore architectures. 3D-printed scaffolds were also subjected to post-processing through chemical crosslinking (in N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide) and lyophilization. The scaffolds were physicochemically characterized through Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis, Differential Scanning Calorimetry, and mechanical (tensile) testing. In vitro experiments using Presto Blue and Alkaline Phosphatase assays were conducted to assess cellular viability and the scaffolds’ ability to promote cellular proliferation and differentiation. Rheological analysis indicated shear thinning capabilities in the collagen gels. Crosslinked and lyophilized 3D-printed scaffolds were thermally stable at 37 °C and did not show signs of denaturation, although crosslinking resulted in poor mechanical strength. PB and ALP assays showed no signs of cytotoxicity as a result of crosslinking. Fibrillar collagen was successfully formulated into a colloidal gel for extrusion through a direct inkjet writing printer. 3D-printed scaffolds promoted cellular attachment and proliferation, making them a promising material for customized, patient-specific tissue regenerative applications.

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“…The main disadvantage of NMMO as a solvent is its crystalline state at room temperature. Therefore, the dissolution must be at high temperatures exceeding 100 • C [18,20,22,26,[28][29][30][31][32] or using a co-solvent [33]. During the formation of membranes, it is necessary to carefully control the temperature regime, as a decrease in temperature can lead to undesirable crystallization of the forming solution, which will not allow obtaining a membrane with the required structure.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Non-Solvent Nature on the Rheological Properties of Cellulose Solution in Diluted Ionic Liquid and Performance of Nanofiltration Membranes

Ilyin

Kostyuk

Anokhina

et al. 2023

IJMS

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The weak point of ionic liquids is their high viscosity, limiting the maximum polymer concentration in the forming solutions. A low-viscous co-solvent can reduce viscosity, but cellulose has none. This study demonstrates that dimethyl sulfoxide (DMSO), being non-solvent for cellulose, can act as a nominal co-solvent to improve its processing into a nanofiltration membrane by phase inversion. A study of the rheology of cellulose solutions in diluted ionic liquids ([EMIM]Ac, [EMIM]Cl, and [BMIM]Ac) containing up to 75% DMSO showed the possibility of decreasing the viscosity by up to 50 times while keeping the same cellulose concentration. Surprisingly, typical cellulose non-solvents (water, methanol, ethanol, and isopropanol) behave similarly, reducing the viscosity at low doses but causing structuring of the cellulose solution and its phase separation at high concentrations. According to laser interferometry, the nature of these non-solvents affects the mass transfer direction relative to the forming membrane and the substance interdiffusion rate, which increases by four-fold when passing from isopropanol to methanol or water. Examination of the nanofiltration characteristics of the obtained membranes showed that the dilution of ionic liquid enhances the rejection without changing the permeability, while the transition to alcohols increases the permeability while maintaining the rejection.

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A novel method for producing cellulose nanoparticles and their possible application as thickeners for biodegradable low-temperature greases

Cited by 16 publications

References 91 publications

Oleo‐Dispersions of Electrospun Cellulose Acetate Butyrate Nanostructures: Toward Renewable Semisolid Lubricants

Oleo‐Dispersions of Electrospun Cellulose Acetate Butyrate Nanostructures: Toward Renewable Semisolid Lubricants

3D Printing Type 1 Bovine Collagen Scaffolds for Tissue Engineering Applications—Physicochemical Characterization and In Vitro Evaluation

The Effect of Non-Solvent Nature on the Rheological Properties of Cellulose Solution in Diluted Ionic Liquid and Performance of Nanofiltration Membranes

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