Temperature and Pressure Dependence of the Viscosity of the Ionic Liquids 1-Methyl-3-octylimidazolium Hexafluorophosphate and 1-Methyl-3-octylimidazolium Tetrafluoroborate

2006 ◽  
Vol 51 (3) ◽  
pp. 1161-1167 ◽  
Author(s):  
Kenneth R. Harris ◽  
Mitsuhiro Kanakubo ◽  
Lawrence A. Woolf
Keyword(s):  
Ionic Liquids ◽  
Pressure Dependence ◽  
Temperature And Pressure

On the temperature and pressure dependence of dielectric relaxation processes in ionic liquids

2021 ◽  
Author(s):  
Florian Pabst ◽  
Zaneta Wojnarowska ◽  
Marian Paluch ◽  
Thomas Blochowicz
Keyword(s):  
Ionic Liquids ◽  
Dielectric Relaxation ◽  
Pressure Dependence ◽  
Dynamic Processes ◽  
Relaxation Processes ◽  
Dielectric Spectra ◽  
Temperature And Pressure ◽  
Microscopic Origin

The temperature and pressure dependence of two dynamic processes in the dielectric spectra of five supercooled ionic liquids equipped with octyl-chains are reported. The microscopic origin of these processes is discussed.

Measurements of real non-Newtonian response for liquid lubricants under moderate pressures

2001 ◽  
Vol 215 (3) ◽  
pp. 223-233 ◽  
Author(s):  
S Bair
Keyword(s):  
Numerical Simulation ◽  
Kinetic Theory ◽  
Simple Shear ◽  
Pressure Dependence ◽  
Shear Stresses ◽  
Current Interest ◽  
Flow Properties ◽  
Power Law Fluid ◽  
Temperature And Pressure

A thorough characterization of all viscous flow properties relevant to steady simple shear was carried out for five liquid lubricants of current interest to tribology. Shear stresses were generated to values significant to concentrated contact lubrication. Two types of non-Newtonian response were observed: shear-thinning as a power-law fluid and near rate-independence. Functions and parameters were obtained for the temperature and pressure dependence of the viscosity and of the time constant for the Carreau-Yasuda equation. Results are consistent with free volume and kinetic theory, but directly contradict many assumptions currently utilized for numerical simulation and for extracting rheological properties from contact measurements.

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