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    Electrospun lignin-PVP nanofibers and their ability for structuring oil

    Year: 2021

    Journal: Int. J. Biol. Macromol., Volume 180, JUN 1, page 212–221

    Authors: Borrego, Maria; Martin-Alfonso, Jose E.; Sanchez, M. Carmen; Valencia, Concepcion; Franco, Jose M.

    Organizations: MICINN-FEDER I+D+i Spanish Programme [RTI2018-096080-B-C21]

    Keywords: Electrospinning; Lignin; Nanofiber; Oil structuring; Oleogel; Rheology

    This work explores the electrospinnability of low-sulfonate Kraft lignin (LSL)/polyvinylpyrrolidone (PVP) solutions in N,N-dimethylformamide (DMF) and the ability of the different micro-and nano-architectures generated to structure castor oil. LSL/PVP solutions were prepared at different concentrations (8-15 wt%) and LSL:PVP ratios (90:10-0:100) and physico-chemically and rheologically characterized. The morphology of electrospun nano structures mainly depends on the rheological properties of the solution. Electrosprayed nanoparticles or micro-sized particles connected by thin filaments were obtained from solutions with low LSL/PVP concentrations and/or high LSL:PVP ratios, whereas beaded or bead-free nanofibers were produced by increasing concentration and/or decreasing LSL:PVP ratio, due to enhanced extensional viscoelastic properties and non-Newtonian characteristics. Electrospun LSL/PVP nanofibers are able to form oleogels by simply dispersing them into castor oil at concentrations between 10 and 30 wt%. The rheological properties of the oleogels may be tailored by modifying the LSL:PVP ratio and nanofibers content. The potential application of these oleogels as bio-based lubricants was also explored in a tribological cell. Satisfactory friction and wear results are achieved when using oleogels structured by nanofibers mats with enhanced gel-like properties as lubricants. Overall, electrospinning of lignin/PVP solutions can be proposed as a simple and effective method to produce nanofibers for oil structuring. (c) 2021 Elsevier B.V. All rights reserved.
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