Abstract
Room temperature ionic liquids (RTILs) have some unique characteristics which meet the requirement of industry as high performance lubricants. In this work, molecularly thin and well ordered films of 1, 3-dihydroxyethyl-imidazolium hexafluorophosphate were prepared on silicon substrates. Thermal stability of the RTILs was evaluated using Mettler thermal gravity analysis in a nitrogen atmosphere. Chemical compositions of the films were characterized with a multi-functional X-ray Photoelectron Spectrometer. The morphology, nano-friction and nano-adhesion behaviors of RTILs films with different heat treatment were experimentally investigated at the nanoscale using Atomic force microscopy /friction force microscopy (AFM/FFM). Results show that 1, 3-dihydroxyethyl-imidazolium hexafluorophosphate films exhibited different nano-tribological properties under different heat treatment. The corresponding friction-reduction and anti-adhesion mechanism of the tested ultra-thin RTILs films under the test condition were proposed based on the experimental observation. The investigation revealed that heat treatment significantly affected their nano-friction and adhesion properties of the RTILs films. For the friction at nanoscale, the ordered arrangement, chemical bonding ratio and surface energy of the lubricant played significant role.
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