@article{10272/20028,
year = {2021},
url = {http://hdl.handle.net/10272/20028},
abstract = {The present work focuses on the development of lignin micro- and nano-structures obtained
by means of electrohydrodynamic techniques aimed to be potentially applicable as thickening or
structuring agents in vegetable oils. The micro- and nano-structures used were mainly composed of
eucalyptus kraft lignin (EKL), which were doped to some extent with polyvinylpyrrolidone (PVP).
EKL/PVP solutions were prepared at different concentrations (10–40 wt.%) and EKL:PVP ratios
(95:5–100:0) in N, N-dimethylformamide (DMF) and further physico-chemically and rheologically
characterized. Electrosprayed micro-sized particles were obtained from solutions with low EKL/PVP
concentrations (10 and 20 wt.%) and/or high EKL:PVP ratios, whereas beaded nanofiber mats
were produced by increasing the solution concentration and/or decreasing EKL:PVP ratio, as a
consequence of improved extensional viscoelastic properties. EKL/PVP electrospun nanofibers were
able to form oleogels by simply dispersing them into castor oil at nanofiber concentrations higher
than 15 wt.%. The rheological properties of these oleogels were assessed by means of small-amplitude
oscillatory shear (SAOS) and viscous flow tests. The values of SAOS functions and viscosity depended
on both the nanofiber concentration and the morphology of nanofiber templates and resemble those
exhibited by commercial lubricating greases made from traditional metallic soaps and mineral oils},
organization = {This work is part of a research project (Ref. RTI2018-096080-B-C21) sponsored by the
MICINN-FEDER I+D+i Spanish Programme. The authors gratefully acknowledge their financial support. J.F.R.-V. acknowledges receiving the Ph.D. Research Grant PRE2019-090632 from
MICINN (Spain)},
publisher = {MDPI},
title = {Electrohydrodynamic Processing of PVP-Doped Kraft Lignin Micro- and Nano-Structures and Application of Electrospun Nanofiber Templates to Produce Oleogels},
doi = {10.3390/polym13132206},
author = {Rubio Valle, José Fernando and Sánchez Carrillo, María Carmen and Valencia Barragán, Concepción and Martín Alfonso, José Enrique and Franco Gómez, José María},
}