Dear Yanying Feng,

I work for a company named Moxtek and we used to make a film that was
treated such that specific locations were hydrophobic and other locations
that were hydrophilic.  Our purpose was to deposit drops of solution onto a
specific location and let them dry so all of the solute deposited into
hydrophilic regions for x-ray chemical analysis.  The dried spots served to
preconcentrating a volume of solution to achieve better sensitivity during
analysis.  We developed a patented process for this work.  The patent
numbers that are relevant are US patent # 5,958,345 and patent #5,544,218.
If you need further assistance, contact me at 801 225-0930

Andrew J. Nielson
MEMS products manager
MOXTEK, INC
Orem, Utah

-----Original Message-----
From: shay kaplan [mailto:[email protected]]
Sent: Sunday, January 13, 2002 11:49 PM
To: [email protected]
Subject: Re: [mems-talk] If there is any method to make some domains
hydrophobic and theothers hydrophilic in microchannels?


you can try coating hydrofilic areas with teflon, parylene etc to make the
hydrofobic

Shay Kaplan

Yanying Feng wrote:

> 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
>             [email protected]
> ________________________________________________________
> MEMS Lab
> Department of Precision Instruments and Mechanology
> Tsinghua University
> Beijing
> P. R. China
> 100084
> _________________________________________________________
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