If it's truly stuck (have you tried just flowing backwards?) find a
box furnace and stick it in overnight at 400 C (**ramp at ~8 C per
hour max**). You'll either melt of decompose your dye at that point.
It's not going to go away or look pretty when you're done, but there's
a good chance it'll reflow to the point where you can get at least
some liquid past it. If you need to push the temp further, don't take
the chips above about 500 C. Thermal bonding of glass chips is
typically done around 600 C, so you'll risk deformation at some point,
and it won't make a difference to the dye.
Next time, use a filter :-)
- Kevin
On Fri, Mar 15, 2013 at 8:35 AM, Avinash sahu wrote:
> Hi Michael,
>
> I am using glass microchannel with 150 x 150 micrometer cross section.
>
> On Fri, Mar 15, 2013 at 12:11 AM, Michael Martin <
> michael.martin@themicrowerks.com> wrote:
>
>> Hi Avinash,
>>
>> What material are your channels made from? If it is PDMS then you might
>> have had them change back to a hydrophobic state. I hear that if a plasma
>> activated channel is left in air for even a short time (~hours) at room
>> temperature, hydrophobic sections of the polymer will migrate to the
>> surface thus creating a larger back pressure and causing hydrophobic
>> material in the flow stream to precipitate out. So evidently you should
>> keep PDMS chips in water at all times.
>>
>> Hope this helps,
>> Michael
>>
>>
>> On Mar 13, 2013, at 4:41 PM, Avinash sahu wrote:
>>
>> > hi all,
>> > I have some issue related to microchannel hope you can resolve it. Please
>> > suggest me the way to remove the blockage and cleaning procedure in
>> > microchannel. One of the my microchannel was blocked by bromothymolblue
>> dye
>> > and Phenolphthalein dye solution and in other channel I had good flows
>> like
>> > slug, stratified etc at starting but now not even slug flow is not
>> comming.
>> > The slug flow comes at lower flow like 0.01 - 0.1 ml/min. I am using Y
>> > junction mirochip 150x150 micrometer. I tried using Isopropyl alcohol,
>> > acetone, 35% HCL,35%H2O2, H2SO4, sonication at 35 Hz and 135 Hz for both
>> > cleaning and blockage purpose, nothing is working. Please help me with
>> this
>> > I will be thankful for you.
>> >
>> > --
>> > Avinash Sahu
>> > MS Research Scholar
>> > Chemical Engineering
>> > IIT Madras (T.N.) 600036
>> > 9003387409(M)
>> > Profile Page
>> > http://www.che.iitm.ac.in/~spush/avinash.html
>> > For details on the International Conference Mathematics in Chemical
>> > Kinetics and Engineering- please visit
>> > http://www.mackie2013.iitm.ac.in/
>> > _______________________________________________
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>
>
>
> --
> Avinash Sahu
> MS Research Scholar
> Chemical Engineering
> IIT Madras (T.N.) 600036
> 9003387409(M)
> Profile Page
> http://www.che.iitm.ac.in/~spush/avinash.html
> For details on the International Conference Mathematics in Chemical
> Kinetics and Engineering- please visit
> http://www.mackie2013.iitm.ac.in/
> _______________________________________________
> Hosted by the MEMS and Nanotechnology Exchange, the country's leading
> provider of MEMS and Nanotechnology design and fabrication services.
> Visit us at http://www.mems-exchange.org
>
> Want to advertise to this community? See http://www.memsnet.org
>
> To unsubscribe:
> http://mail.mems-exchange.org/mailman/listinfo/mems-talk
_______________________________________________
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provider of MEMS and Nanotechnology design and fabrication services.
Visit us at http://www.mems-exchange.org
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