devas@nano.cnr.it

5. Nanotribology at surfaces:

Contact person:
Guido Paolicelli
Maria Clelia Righi

Purpose of the activity is the study of the complex processes governing tribological phenomena at the nano- and micro-scale. The output of the research is then applied to the control of the sliding conditions and movements in nano- and micro-mechanisms. At the nanoscale the main target is the evaluation of fundamental friction forces (energy dissipation channels) and mechanical response of nanomaterials like graphene and other low dimensional systems. The challenge at the microscale is instead to understand and optimize the tribological behavior of sliding interfaces in which surface structures, defects and environmental conditions play a major role. Graphene is a natural candidate to be the thinnest solid state lubricant and antiwear coating.Few layers graphene (FLG) films grown by CVD on nickel are composed by grains of variable layers thickness, with lateral size of a few microns separated but connected by boundary regions.

 

Topology and friction map correlation for specific Gr/Ni–P region.
M. Tripathi, F. Awaja, G. Paolicelli, R. Bartali, E. Iacob, S. Valeri, S. Ryu, S. Signetti, G. Speranza and N. M. Pugno, Tribological characteristics of few-layer graphene over Ni grain and interface boundaries, Nanoscale, 8, 6646 (2016)

 

 

Metal proximity, spatial confinement and defect distribution largely influence the reducibilityin cerium oxide, property on which most of the applications of the material are based.

 

Friction coefficient results in a dry and in a contact lubricated by different solvents.
D.Marchetto, P.Restucci, A.Ballestrazzi, M.C.Righi, A.Rota and S.Valeri Surface passivation by graphene in the lubrication of iron: a comparison with bronze, Carbon , 116, 375 (2017)


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