Group 1 included pawing, pawing nose, biting/pawing leash, opening mouth, rubbing face, and shaking head.
Based on the above experiment results, the mechanism of WS2 nanosheets reducing friction and wear can be attributed to the formation of tribofilm on the rubbing face.
Then, the adsorbed WS2 will form a continuous tribofilm on the rubbing face and the tribofilm can improve the tribological properties of the base oil by decreasing the shearing stress and yielding low wears.
Moreover, the experiment results indicated that WS2 nanosheets penetrate into the friction interface and form a continuous tribofilm on the rubbing face, which could improve the anti-friction anti-wear properties.
It is believed that the reduction of friction and wear must come from the addition of ultrathin WS2 nanosheets which can penetrate and enter the friction interface and form a continuous tribofilm on the rubbing face.
When WS2 is used as a lubrication additive, WS2 nanosheets will be easy to penetrate and enter the interface of the rubbing face and be adsorbed on the surface of the tribopairs.
Always whine, cry quietly, lay down when possible, rub face and complain of symptoms.
He rubbed his face in his hands.
He just rubbed his face with his large, soft hands.
He rubbed his face; his eyeballs felt like rotten plums.
