Electrospun lignin-PVP nanofibers and their ability for structuring oil.
Int J Biol Macromol
; 180: 212-221, 2021 Jun 01.
Article
de En
| MEDLINE
| ID: mdl-33737178
ABSTRACT
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 LSLPVP ratios (9010-0100) and physico-chemically and rheologically characterized. The morphology of electrospun nanostructures 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 LSLPVP ratios, whereas beaded or bead-free nanofibers were produced by increasing concentration and/or decreasing LSLPVP 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 LSLPVP 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.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Huile de ricin
/
Povidone
/
Nanofibres
/
Lignine
Langue:
En
Journal:
Int J Biol Macromol
Année:
2021
Type de document:
Article
Pays d'affiliation:
Espagne