Synergistic effects of nanoparticles and ionic liquids as hybrid lubricant additives

  1. Nasser, Khodor
Dirixida por:
  1. Josefa Fernández Director
  2. Enriqueta R. López Iglesias Director

Universidade de defensa: Universidade de Santiago de Compostela

Fecha de defensa: 29 de abril de 2022

Tribunal:
  1. Antolín Esteban Hernández Battez Presidente/a
  2. María José Pérez Comuñas Secretaria
  3. David Emanuel Pimentel Gonçalves Vogal
Departamento:
  1. Departamento de Física Aplicada

Tipo: Tese

Teseo: 720935 DIALNET lock_openMINERVA editor

Resumo

This 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.