Dear Lady or Gentlmen:
     I want to form some surface pattern of hydrophility in microchannels.Is
there any method to make some domains hydrophobic and the other hydrophilic in
silicon microchannels? The microchannel is constructed by bonding a silicon
substrate with etched channels to a Pyrex glass coverslip. Thank you any way!


With best regards

            Yanying Feng
            fengyy@post.pim.tsinghua.edu.cn
________________________________________________________
MEMS Lab
Department of Precision Instruments and Mechanology
Tsinghua University
Beijing
P. R. China
100084
_________________________________________________________