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[请教]用液氮和丙酮配混合溶液用来至冷的比例！
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amorphous
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5楼2008-11-21 08:24:29
2楼2008-10-24 08:54:04
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3楼2008-10-25 17:48:22
IPA/LN2
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An isopropyl alcohol (IPA)/liquid nitrogen (LN2) slurry is used to maintain cold trap temperatures of approximately -80 °C. Use the following instructions to mix such a slurry if this is the temperature you wish to maintain. 1.Chill a 600-mL dewar by rinsing it with LN2. Allow a small amount of LN2 to remain in the bottom of the dewar (approximately 1 cm deep). 2.Stirring constantly, slowly add approximately 500 mL of IPA. For greatest safety, use a laboratory squirt bottle. Squirt the stream of IPA along the inside edge of the dewar, very near the top, allowing the IPA to flow down the dewar’s inside wall. Do not stop stirring the mixture in the bottom of the dewar, even if stirring becomes difficult. As you continue stirring and adding IPA, the mixture will loosen and become easier to stir. 3.When all the IPA has been placed in the dewar, slowly begin pouring LN2 into the dewar. Approximately 1 liter is needed. You must continuously stir the mixture as you add the LN2. As ice chunks form, break them up and stir them down into the mixture. Avoid splashing. Gently knock ice chunks away from the sides of the dewar and continue stirring. Add liquid nitrogen until the slurry is within 25 mm (1 in.) of the top of the dewar. 4.Lift the stirrer out of the slurry and observe as the slurry drips into the dewar; the stirrer should be thickly coated with slurry. Your goal is to achieve a slurry that has a thick, syrupy consistency without large chunks. When the slurry is cold enough, small pieces of ice may be present (10 - 20% of the mixture). A little ice accumulation along the sides of the dewar is acceptable. |
4楼2008-11-20 17:08:11