Hi,

        I think it depends on the depth of the channel. You know it is
easily distorted because of its flexibility. I guess aspect ratio of 2
(height/width) is possibly working, but it is hard to declare. I tried
20x20 micron square like structures with height of around 30 micron, and
it was not bad. The gaps among the structures were around 20 micron. But
the length of your channel is longer than mine... So... you need to
try...  And you need to be careful during handling, if it is very thin
like 100 micron or something, it seems almost impossible to remove
tension all over the layer when you remove it from the mold.

Hope this helps.

Woo-Jin

------------------------------------------
Chang, Woo-Jin
Research Professor

Center for Advanced Bioseparation Technology
Inha University, Incheon 402-751, Korea

Office: +82-32-860-8735
Fax: +82-32-865-2771
e-mail: [email protected]
------------------------------------------

-----Original Message-----
From: Henchir, Kristie [mailto:[email protected]]
Sent: Friday, March 19, 2004 5:41 AM
To: '[email protected]'
Subject: [mems-talk] minimum distance for bonding PDMS

Hi,

I am a graduate student and fairly new to the area of microfabrication.
I am
interested in bonding thin, cured layers of PDMS to create
microchannels. I
am familiar with many of the papers that describe bonding using oxygen
plasma; however, I am curious as to the area required for adequate
bonding.
Will I get adequate bonding if the channels (diameter 15-100 microns,
length
1-2 cm) are separated by only 10 microns or do I need several hundred
microns? Does anyone know the minimum distance needed?  Thanks for your
help.

Sincerely,
Kristie