Dear Nathan,

thank you for your suggestion. i will try to use the cyanoacrylate to bond
PDMS and Polycarbonate,.

Allwyn.

On Tue, Dec 15, 2009 at 3:09 AM, Nathan McCorkle  wrote:

> 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.