Reena,

To mix your KOH pellets with DI water, I suggest measuring out the
amount of required DI water, then add the required quantity of KOH
pellets in small quantities.  This will allow you to control the
magnitude of the exothermic reaction.

If at some point you wish to try super-saturated solutions of KOH in DI
water, I suggest the following.   Once the solution is saturated (the
pellets no longer dissolve in the solution at room temperature), heat
the solution to dissolve more KOH into the solution.  This will produce
a super-saturated solution of KOH.

Best Regards,

Tim Watson
Microfabrication Technician
MicroMD laboratory
1381 Kinnear Road, Suite 100
Columbus, OH 43212
Tel: 614-688-8474
Fax: 614-688-3379
www.micromd.org




-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
Reena Al-Dahle
Sent: Tuesday, December 09, 2003 12:02 PM
To: [email protected]
Subject: [mems-talk] re: hot plate with vacuum capabilities and KOH
mixing


Hello Everyone,



I have two questions to ask and would highly appreciate the help:



(a)     I am currently looking for a hot plate with vacuum capabilities
for
proximity baking under the price of 1,000 US for our new lab. If you
have come across anything

similar, please send it my way.

(b)     I am also running some etching tests for the first time, and
have
come across a road block for lack of chemistry background. I have some
KOH pellets and need to

mix them with DI water (1:2) for etching <100> Si wafers..what's the
best way of doing this, since KOH does react exothermically with water?



Thank you all and have a nice day!

Reena Al-Dahleh

M.Sc. Electrical Engineering

Antennas & Microelectromechanical Systems(MEMS)

CIRFE Labs

University of Waterloo

Office: (519) 885-1211 ext. 7024



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