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<p class="MsoNormal"><span style="color:#1F497D">Tony,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">A couple of years ago we installed a dedicated KOH bath inside a fume hood for some of our research folks. The bath is made by Modutek and is electrically heated. The tank itself is quartz and has a Teflon liner.
There is also a coil of tubing around the top that flows cold water in order to condense vapors and return them to the tank. The tank uses a magnetic stirrer (air or N2 powered) for stirring. We had some issues initially with the tank as supplied but those
issues have been resolved.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Please feel free to contact me privately if you’d like more details.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:#1F497D">Jeff Kuhn<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Facility Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Birck Nanotechnology Center<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Purdue University<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">1205 W. State St.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">West Lafayette, IN 47907<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Ph: (765) 496-8329<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Fax: (765) 496-2018<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Tony L Olsen<br>
<b>Sent:</b> Monday, July 22, 2013 6:03 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] KOH Tank Design<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Dear Labnetwork<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">We are building a new wet bench and would like to include a dedicated KOH etch bath to replace the current methodology of glassware with stir bars on a hotplate. We generally use a bath of 80°C.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Our wetbench vendor initially quoted a recirculated bath in a stainless steel tank. We are concerned about the stainless, nor do we believe the Teflon or PVDF wetted surfaces in the proposed diaphragm pump will
hold up to the hot KOH. Another option we are aware of is a quartz tank heated externally by recirculated water. I’m certain there are other options, too.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Can you share your experience with dedicated KOH baths? What is the configuration? What are the materials? How do you mix/stir the bath? What problems have you experienced? What would you do next time?<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Thank You,<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">tonyO<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Tony Olsen<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Nanofab Cleanroom Supervisor/Process Engineer<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">36 S Wasatch Dr, Suite 2500 SMBB<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Salt Lake City, UT 84112<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">801-587-0651 office<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">801-587-3077 fax<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><a href="http://www.nanofab.utah.edu/"><span style="color:#6666CC">www.nanofab.utah.edu</span></a><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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