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<p>Long:</p>
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<p>Mike Rooks will probably also chime in with better information than I have, but LN2 freezing has worked really well for me and is reasonably convenient for me as I already have LN2 dewars in my lab for other reasons. I bought a big dewar that holds racks
of cryo tubes (Chart MVE CryoSystem4000Cryogenic about $3,800 with wheels) that makes it easy to store. The hold time when about 1/3 filled so that the HSQ is not actually immersed in liquid is >6weeks, probably much more.</p>
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<p>One way of reducing cost is to order the 6% HSQ and dilute it with Dow MIBK which is very expensive but has worked well for me ( $420/500ml -
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<p>DC MIBK RINSE SOLVENT 500 ML) which should be available from your HSQ distributor.</p>
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<p>Regards,</p>
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<p>Mark K Mondol<br>
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<font color="3366FF">Mark K Mondol<br>
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<div><font color="3366FF">Assistant Director NanoStructures Laboratory <br>
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<div><font color="3366FF">And <br>
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<div><font color="3366FF"> mondol@mit.edu <br>
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<div><font color="3366FF">office - 617-253-9617 <br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> on behalf of Chang, Long <lvchang@Central.UH.EDU><br>
<b>Sent:</b> Thursday, May 6, 2021 12:26 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] HSQ Alternatives</font>
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<div>Hi All,
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<div class="">I’m looking for HSQ alternatives since it’s expensive, has a 14 week lead time and comes in 250mL bottle. We waste most of the bottle due to it’s 6 months shelf life. Although we had some bottles still good after 2 years at 5C, it’s just a huge
gamble after a year. We tried LN2 freezing, but it takes too much effort.</div>
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<div class="">I’ve attached a table of the cost per mL for the alternatives I found assuming you want 100nm thick. The AQM and EMResist are in powder form and advertise 1 year powder shelf life and 3 months mixture shelf life. They can distribute the powder
into many small bottles. </div>
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<div class="">Particularly interesting is the Medusa 82 which has the lowest cost and advertises better shelf life. Does anyone have experience with these HSQ alternatives?</div>
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<div class=""><img id="B22AB60B-4D51-4545-A7EB-6C2B9D076D07" class="" src="cid:EA246686-78D1-44AC-9192-C364E1E8651D@serc.dhcp.e.uh.edu"></div>
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<div class="">Thanks,<br class="">
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Long</div>
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