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用酸洗（如盐酸HCl）氧化铁纳米粒子（Fe3O4）的酸浓度问题
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| 做磁性纳米粒子如Fe3O4的过程中，文献上常常说用dilute HCl来洗纳米粒子，其中一个作用是让纳米粒子沉淀下来离心分离。这个dilute的HCl的浓度大概是多少？1mol/L, 0.1 mol/L 还是更高或者更低？我想用pH=5、4、3、2的HCl来洗，都不能把铁纳米粒子沉淀下来，但不怕更高的酸浓度会溶解氧化铁纳米颗粒，大家都什么经验？请问dilute HCl的浓度多少比较合适？ |
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- 四氧化铁磁性纳米粒子后处理问题
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5楼2017-11-08 20:45:45
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这个是我在google上搜索到的一段话： HCl (or any other other acid) only reacts with oxides at an appreciable rate if they are not calcined or crystalline. HCl indeed reacts (slowly) with fresh rust (hydrous Fe2O3) or freshly precipitated Fe(OH)3. The solutions formed this way are not green, but bright yellow, due to formation of the complex ion FeCl4(-). Reaction with Fe3O4 probably is nill, because that also is a very compact, waterfree oxide. This effect is quite common. Many freshly precipitated metal hydroxides or oxides easily dissolve in HCl or dilute H2SO4, but aged and dried oxides, or calcined oxides, usually do not dissolve anymore and are remarkably inert. Examples of these are Cr2O3, Al2O3, TiO2, Fe2O3, Nb2O5, Co3O4. |
2楼2013-07-17 16:22:37
3楼2013-07-17 22:27:12
4楼2016-03-14 17:17:10