Investigation of Tribo-chemistry by means of Stable Isotopic Tracers: TOF-SIMS Analysis of Langmuir–Blodgett Films and Examination of their Tribological Properties

Abstract

Deuterium-substituted and 13 C-substituted octadecanoic acids were applied to study tribo-chemistry of binary-component Langmuir-Blodgett film deposited on Si(100) surfaces. Time-of-flight secondary ion mass spectroscopy was employed to study structure of the film. The isotopic tracers give typical fragment ions composed of the isotopes. Among these typical fragment ions, we paid attention to quasi-molecular ions and deuterium ion as ''fingerprint region'' of the film structure. The tribological properties of the binary-component film were evaluated by ball-on-plate type tribo-testers. The combination of octadecanol with octadecanoic acid affords good tribological properties, whereas the combination of octadecylamine with the acid gave poor results. The surface analysis of the plate after the tribo-test revealed that the alcohol and the acid were retained on the track even after the rubbing. On the other hand simultaneous removal of the acid and the amine from the surfaces were observed. Interactions between the acid and the amine were considered by the results of the tribo-tests and the surface analysis of the binary-component film.

Tracing propionic acid infused to rat brain via deuterium tagging—further development of a novel rodent model of autism spectrum disorders

“…1d are associated with sodium (because the chemical we used is a sodium salt of propionic acid). Many of the ion fragments shown here are also observed for deuterated fatty acids and lipids 19, 20…”

The Tribological Properties of Ionic Liquids Composed of Trifluorotris(pentafluoroethyl) Phosphate as a Hydrophobic Anion

“…We previously reported the utility of stable isotopic tracers for the investigation of tribo-chemistry [26,27]. TOF-SIMS spectrum of the rubbed surface with d-C12A in EMIM-FAP clearly shows negative ion at m/z 222, which is identified as the quasi-molecular ion, C 11 D 23 CO 2 - (Fig.…”

“…4, 5), even though it has short alkyl to develop the boundary film proposed by Bowden [24,25]. The deuterium-labeled dodecanoic acid was also examined for mechanistic investigation by means of stable isotopic tracers [26,27]. It improved the tribological properties similar to dodecanoic acid.…”

Effects of fine‐dispersed PTFE on load carrying capacity of PEEK

“…TOF-SIMS provides information on the chemical structure on the surfaces after tribotests. 11,12 Therefore, the chemical images and the relative intensity of the PTFE and iron components on the rubbed surfaces of PEEK-based materials after tribotests were measured by TOF-SIMS. The TOF-SIMS measurements were carried out on a Physical Electronics TFS-2100 (Physical Electronics, Chanhassen, Minnesota, U.S.) (TRIFT-II) instrument.…”