10.1021/acs.jpclett.7b01377.s004
Hyunsoo Lee
Hyunsoo
Lee
Jae-Hyeon Ko
Jae-Hyeon
Ko
Jin Sik Choi
Jin Sik
Choi
Jin Heui Hwang
Jin Heui
Hwang
Yong-Hyun Kim
Yong-Hyun
Kim
Miquel Salmeron
Miquel
Salmeron
Jeong Young Park
Jeong Young
Park
Enhancement of Friction by Water Intercalated between
Graphene and Mica
American Chemical Society
2017
theory calculations show
vibration
intercalated water
graphene
excitation
Mica Common experience
interface
mica
substrate
energy transfer processes
2017-07-11 00:00:00
Media
https://acs.figshare.com/articles/media/Enhancement_of_Friction_by_Water_Intercalated_between_Graphene_and_Mica/5209129
Common
experience shows that friction converts mechanical energy
into heat. The first part of this process is vibrational excitation
of atoms at the interface between rubbing bodies. The second part
is the removal of the vibration energy by transferring it from the
interface to the substrate. However, it is difficult to disentangle
the excitation and energy transfer processes. We solved this by using
a system consisting of a SiO<sub>2</sub>-terminated tip sliding over
graphene deposited on mica with intercalated water between them. The
intercalated water was found to increase friction by a factor of ∼3
relative to dry mica. Density functional theory calculations show
that water broadens the spectral range of graphene vibrationsparticularly
the low-frequency flexural modesthus providing new excitation
channels and also by increasing the overlap with the atomic vibrations
of the mica substrate, which facilitates coupling and energy transfer.