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[求助] 花生/豆荚形状的三氧化二铁颗粒合成

本人最近在学习用水热合成做花生豆荚形状的三氧化二铁的颗粒,刚开始做,请教各位有谁做过的, 有几个问题:
1. 合成的时候怎么可以很好地控制形状;
2. 放入反应釜之前是氯化铁和硼酸还有氢氧化钠反应,加入硼酸是什么原因呢;
3. 怎么能让颗粒变成多孔的
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