After the drop had been in contact with the grid for a time, excess solution was blotted away using a strip of filter paper. The sample was dried in air for a few hours, then was vacuum dried. 最后真空干燥怎么操作，是放在真空干燥箱里吗，真空干燥的目的是什么，是干的更快还是有利于保持形貌，希望各位高手给以解答。
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