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南师大js

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[求助] sol-gel method

Here, after condensation of the pure alumina gel, appropriate amounts of calcium acetylacetonate/water and copper(II) acetylacetonate/ethanol      suspensions were added to the aluminium gel. Subsequently, the temperature was reduced to 80 oC and the slurry was heated at reflux for 12 h.
这是采用溶胶凝胶法制备吸收剂文献中制备流程中的一小段,请问句中提及的“the slurry was heated at reflux for 12 h”是什么意思?在实际操作中该如何实现?@崇明先生
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