Tribological properties of fluorinated nanocarbons with different shape factors

Exfoliated fluorinated carbons with a low and stable friction coefficient

“…Thermal exfoliation of nanodiscs was then not successful and the resulting sample appear close to the precursors for which the tribological properties were studied. [8][9][10][11] Tribological tests were then performed only for exfoliated nanobers and graphite. Both the exfoliated structure and presence of residual uorine may act on the friction energy.…”

“…For such compounds, we showed in previous works that the friction reduction mechanisms are associated to a lowering of interparticles interactions due to the uorination of external graphene layers. [8][9][10] It has then to be noticed that the observed deuorination of the compounds during exfoliation does not deteriorate the lubricating performances of the tested materials. If considering the stability of m for raw and exfoliated materials and the weak uorination rate of Exf-FG and Exf-FCNF, the good friction properties seem to be related to the weakening of the interparticles interactions due to the exfoliation process rather than to the uorine content.…”

“…7 For uorinated 0D, 1D and 2D nanocarbons, namely graphitized carbon blacks, nanobers and nanodiscs, which exhibit similar covalent CF bonding and a closed structure, good tribological properties were achieved whatever the uorine content and those nanomaterials appear as excellent precursors for the tribo-active phase in lubrication. [8][9][10][11] Indeed the friction coefficients of the uorinated nanocarbons ranged between 0.065 and 0.085, and are weaker than those of most solid lubricants (graphite). Accommodation of uorine atoms into the carbon lattice with a F/C atomic ratio higher than 0.15 results in easy cleavage for the cases of uorinated carbon blacks and nanobers.…”

“…Accommodation of uorine atoms into the carbon lattice with a F/C atomic ratio higher than 0.15 results in easy cleavage for the cases of uorinated carbon blacks and nanobers. [7][8][9][10][11] The aim of the present paper is to investigate the tribological properties of graphene materials, which are prepared by an easy operating, highly scalable, and low-cost method by applying a fast thermal treatment on highly uorinated carbons under argon atmosphere. This route differs from the three conventional synthesis methods to obtain uorinated graphene; all require mild conditions as follows: (i) reaction between raw graphene and uorinating agent such as XeF 2 or F 2 , (ii) exfoliation of (highly) uorinated graphite, (iii) uorination of graphene oxide (GO).…”

Fluorinated carbonaceous nanoparticles as active material in primary lithium battery

“…Thus, a positive effect can be obtained with carbon-fluorine nanoparticles since it should combine the properties of CFx and nanoscale. The first electrochemical studies on fluorinated nanocarbons in lithium battery have 3 been achieved by Hamwi et al [10] and Touhara et al [11], and several papers have been published during the last decade on these topics [12][13][14].…”