This involves flowing a fluid over the surface wherein {HEAD ~ the fluid} contains {TAIL ~ positively charged ions} and electrons 
contains
This involves flowing a fluid over the surface wherein { HEAD ~ the fluid } contains { TAIL ~ positively charged ions } and electrons
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH