AI Article Synopsis
- This study examines the use of Kraft lignins from different poplar types to create nanostructures via electrospinning, which can enhance vegetable oils for eco-friendly lubricants.
- Lignin-based nanofiber mats effectively blended with various vegetable oils demonstrated stable gel-like properties and varying flow behavior based on fiber morphology and lignin processing conditions.
- The resulting formulations showed tribological performance similar to traditional lubricants, with added oxidative stability influenced by the type of vegetable oil.
Article Abstract
This work explores the use of Kraft lignins sourced from different poplar genotypes ( L. "PO-10-10-20" and × "Ballotino") isolated by selective acid precipitation (at pHs 5 and 2.5) to produce electrospun nanostructures that can be further employed for structuring vegetable oils. This approach offers a new avenue for converting these waste materials into high-value-added ingredients of eco-friendly structured lubricants. Electrospinning of poplar Kraft lignin (PKL)/cellulose acetate (CA) solutions yielded homogeneous beaded nanofiber mats that were able to generate stable dispersions when they were blended with different vegetable oils (castor, soybean, and high-oleic sunflower oils). Electrospun PKL/CA nanofiber mats with larger average fiber diameters were achieved using the lignins isolated at pH 5. Dispersions of PKL/CA nanofibers in vegetable oils presented gel-like viscoelastic characteristics and shear-thinning flow behavior, which slightly differ depending on the nanofiber morphological properties and can be tuned by selecting the poplar lignin genotype and precipitation pH. The rheological properties and tribological performance of PKL/CA nanofibers suitably dispersed in vegetable oils were found to be comparable to those obtained for conventional lubricating greases. Additionally, lignin nanofibers confer suitable oxidative stability to the ultimate formulations to different extents depending on the vegetable oil used.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11323950 | PMC |
| http://dx.doi.org/10.1021/acssuschemeng.4c05013 | DOI Listing |
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