Fernández Pérez, JosefaLópez Iglesias, EnriquetaNasser, Khodor2022-05-302023-04-292022http://hdl.handle.net/10347/28749This Doctoral Thesis presents new designed nanolubricants as potential substitutes of conventional lubricants. Hexagonal boron nitride nanoparticles, graphene nanoplatelets, iron oxide nanoparticles (synthetized from iron mine sludge), three phosphonium ionic liquids and two polyalphaolefin base oils (PAO32 and PAO10) were the materials selected. The techniques used in the characterization of nanoparticles, base oil, ionic liquids, and the worn surfaces from the tribological tests were Raman, SEM, FTIR, HRTEM, XRD or 3D profilometry. Viscosity, density, viscosity index, stability and tribological behavior (friction and wear) of designed nanolubricants were studied. Most of them improved the overall properties of PAO32 40 % reduction in friction and 99 % in wear being stable up to 240 days.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/TribologyLubricantsNanoadditivesThermophysical PropertiesIonic LiquidsHexagonal Boron NitrideGrapheneMaterias::Investigación::22 Física::2205 Mecánica::220505 FricciónMaterias::Investigación::22 Física::2211 Física del estado sólido::221130 TribologíaMaterias::Investigación::33 Ciencias tecnológicas::3321 Tecnología del carbón y del petróleo::332106 Aceite y grasa lubricantesdoctoral thesisopen access