Details

Autor(en) / Beteiligte

• Martín-Alfonso, J.E.
• Martín-Alfonso, M.J.
• Franco, J.M.

Titel

Tunable rheological-tribological performance of “green” gel-like dispersions based on sepiolite and castor oil for lubricant applications

Ist Teil von

• Applied clay science, 2020-07, Vol.192, p.105632, Article 105632

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• This work has been focused on the preparation and characterization of gel-like dispersions based on sepiolite and castor oil potentially suitable as eco-friendly lubricating greases. Particularity, the effect of sepiolite content exerted on rheological, chemical, thermal and tribological properties was studied. The system exhibited a gel-like behaviour for all the concentrations considered (20–40 wt%) related to the development of a sepiolite three-dimensional colloidal network due to its characteristic nanoscale structure formed by fibers, laths and bundles. The values of both apparent viscosity and viscoelastic functions in the linear viscoelastic region increased with sepiolite content, as a consequence of a strengthening of the gel network. An empirical correlation between viscoelastic modulus and sepiolite concentration was proposed. From tribological point of view, the friction coefficient values and wear marks obtained after the frictional tests became lower when sepiolite concentrations decrease. Gel-like dispersion formulated with 30 wt% sepiolite showed appropriate rheological and tribological behaviour to be used as biolubricating greases. •Development of gel-like dispersions based on sepiolite and castor oil.•Role of network structure on the rheological and tribological properties.•Chemical properties are in agreement with rheological results.•Optimum concentration of sepiolite compared with model grease.