You should be able to bond with cyanoacrylate or applying oxygen plasma to
each layer, then pressing the two together to bond.

On Thu, Dec 10, 2009 at 10:44 AM, Nano World wrote:

> Dear all,
>
> I have a thin layer of PDMS (30µm thick)  sandwiched between foils of
> polycarbonate.  The lower polycarbonate layer has channels of ~25µm depth
> and 150µm width. There are interconnects that supplies the fluid to the
> channel (water)
>
> I have to prevent the leakage of water. Hence I am clamping the whole
> system
> between two thick  blocks (by means of screws). When I apply a hydrostatic
> pressure I could see the water flow in the micro channels and also in the
> interconnects.
>
> The main problems are:
>
> (i) If I apply less pressure on the clamping, the water leaks between the
> interfaces.
>
> (ii) If I apply more pressure then there is no flow of water in the
> microchannels. I suspect this is due to the fact that the PDMS membrane
> stretches and also some form of bending occurs (PDMS might bends and block
> the channel) that block the flow of water.
>
> (iii) The clamping pressure is not uniform and since it is applied manually
> this could also have some implications.
>
> My questions are:
>
> 1. Is there is any way that I can make the clamping leak proof and in the
> same time have a nice flow (less than 1痞/min).
>
> 2. Lot of bonding methods have been presented in the literature. Has anyone
> successfully verified bonding of PDMS/ polycarbonate in their own
> laboratory
> settings.
>
> 3. Should a thicker PDMS membrane or a fluid such as isoproponal which has
> smaller contact angle with water will solve the problem.
>
> Thank you in advance
> Allwyn.

--
Nathan McCorkle
Rochester Institute of Technology
College of Science, Biotechnology/Bioinformatics