Moelcules that brush will impart friction. they cannot keep moving at the same speed, basic physics. Double mass, velocity halves even if they were going at the same speed with constant energy.
Friction is not and can
not be "imparted" by any scientific definition. It's more than obvious you're (apparently?) unaware of exactly what friction even is.
So... other than as a guess, can you tell us what the frictional coefficient is between a sodium chloride molecule and a carbon molecule? And is this friction force static or kinetic? Or can it be either, and if so why?
The frictional force can be expressed as:
Ff =
μ N
where
Ff = frictional force (N, lb)
μ = static (μs) or kinetic (μk) frictional coefficient
N = normal force (N, lb)
—I await your considered opinion, along with your calculations.