Tribological and Thermal Properties of Ionic Liquids

Master's Thesis


Increasing the efficiency of existing refrigeration systems is possible if a new alternative refrigerant can be selected. An ideal refrigerant would be CO2 because it is a natural refrigerant with an extremely high efficiency. In an effort to use CO2 as a refrigerant, ionic liquid lubricants were considered to carry the CO2 and act as the working fluid. The thermal conductivity, viscosity, and pressure-viscosity coefficient were measured for several ionic liquids using a Unitherm Thermal Conductivity Measurement System, a viscometer, and an Elastohydrodynamic Lubrication (EHL) rig, respectively. The ionic liquids tested are 1-butyl-3-methylimidazolium-trifluoromethanesulfonate, tributyl(dodecyl)phosphonium 1,2,3-triazolide and trihexyl(tetradecyl)phosphonium 1,2,3-triazolide. Tests were also performed on paraffin, hexadecane, and dodecane for comparison. Results show that ionic liquids have the potential to be suitable lubricants.


Attribute NameValues
  • etd-11042012-195804

Author Amy Libardi
Advisor Steven Schmid
Contributor Tim Ovaert, Committee Member
Contributor Steven Schmid, Committee Chair
Contributor Mihir Sen, Committee Member
Degree Level Master's Thesis
Degree Discipline Aerospace and Mechanical Engineering
Degree Name Master of Science in Mechanical Engineering
Defense Date
  • 2012-09-24

Submission Date 2012-11-04
  • United States of America

  • ionic liquids

  • pressure coefficient of viscosity

  • lubrication

  • pressure-viscosity coefficient

  • University of Notre Dame

  • English

Record Visibility Public
Content License
  • All rights reserved

Departments and Units

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