Tuesday, June 20, 2006

Thank you Matt

Dear Matt,
Thanks for your informative posting..
have a nice trip

Monday, June 12, 2006

PDMS Tutorial

Here is the summary for making pdms chips where everyone can find it.

1) Mix PDMS ratio 10:1
2) Vacuum Bubbles
3) Pour PDMS onto wafer
4) Remove remaining bubbles (pop)
5) Bake 3+ Hours
6) Cut out & Plasma Clean, 20-sec
7) Seal + Cover Scotch Tape
8) Bake 2+ Hours
9) Insert tubing
10) Coat junctions w\ silicon sealant
11) Bake again, 2+ hours
12) Cover with epoxy, ratio 30:1
13) Cure and Bake (1-hour+)

Silgard 184 is the PDMS Kit commonly used for microfluidics. Use 10 parts A to 1 part B.

You can mix parts A and B in a bowl with chop stick.

Remove bubbles with vacuum chamber for 5-min.

Pour PDMS onto a silicon wafer. Let stand 10-minutes and then pop remaining bubbles with needle.

Bake the PDMS after pouring for 3+ hours.

Let PDMS Cool and then Cut out one patterned piece and one blank piece.

Place in plasma cleaner, pattern side up. Plasma clean 15-20 seconds.

Place plasma-cleaned sides together and let seal. Cover region of interest with scotch tape (so it will be clean when you look under microscope). Place in oven 2+ Hours.

Insert tubing inputs. These consist of 30-gauge steal tubing (needle tubing) and tygone tubing (0.25-mm inner diameter). Next, seal joints with silicon sealant. Bake 2+ hours to cure sealant.

I found this epoxy somewhere in seomyeon. There is better epoxy available, I am sure, but I don't know where to find it. Anyhow, use 30-parts to 1-part (approximate).

Once again, chopstick and plastic dishware are quite useful.

Apply, let cure and bake. Yey. You're done.

Sunday, June 04, 2006

Introducing Blog

Dear friends,
Lets start blog. Sharing the research experiences is the best way to build up a healthy research group which will make challenging outputs. Lets use this blog for sharing our reseach achievements, problems, difficulties faced during work, methods to overcome these etc. I hope al you guys will contibute your ideas regularly.
Have a nice time