Abstract
Proton transfer in water attracts great interest, because of main role of this process in many biological technologies (e.g. cell-cell communication), or possible applications in fuel cell technologies. We elucidated proton transfer mechanism in fused-silica extended-nano space with experiment using isotopic species, deuteron (D ) and proton (H ). The results of deuteron and proton diffusion measurements suggest that thermal hopping (not quantum tunneling) is dominant mechanism for proton transfer in extended-nano space.