Salts-based size-selective precipitation: toward mass precipitation of aqueous nanoparticles.
Salts-based size-selective precipitation: toward mass precipitation of aqueous nanoparticles.
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DOI：
10.1021/la903986v
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Chunlei Wang;Min Fang;Shu Xu;Yi-Ping Cui
中科院分区：
文献类型：
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作者：
Chunlei Wang;Min Fang;Shu Xu;Yi-Ping Cui
纯化是纳米晶体应用前的必要步骤，因为纳米颗粒溶液中的过量物质通常会对其随后与其他材料的耦合或组装造成不利影响。在这项工作中，最初开发了一种新的盐基沉淀技术，用于水性nc的沉淀和粒径选择性沉淀。只需加入盐，就能将nc从溶液中析出。将上清液滗出后，沉淀物可再次分散在水中。通过调节盐的加入量，可以实现纳米碳化物的粒径选择性沉淀。也就是说，大尺寸的nc优先析出，在溶液中留下小的nc。与传统的非溶剂型沉淀技术相比，该技术由于避免了传统沉淀过程中的冷凝和加热操作，因此更简单、更快速。此外，无论是半导体纳米颗粒还是金属纳米颗粒，均可采用盐基沉淀技术进行水相纳米颗粒的沉淀。同时，该方法的成本也比传统的非溶剂沉淀技术低得多，适用于水相碳纳米管的大量净化。
Purification is a necessary step before the application of nanocrystals (NCs), since the excess matter in nanoparticles solution usually causes a disadvantage to their subsequent coupling or assembling with other materials. In this work, a novel salts-based precipitation technique is originally developed for the precipitation and size-selective precipitation of aqueous NCs. Simply by addition of salts, NCs can be precipitated from the solution. After decantation of the supernatant solution, the precipitates can be dispersed in water again. By means of adjusting the addition amount of salt, size-selective precipitation of aqueous NCs can be achieved. Namely, the NCs with large size are precipitated preferentially, leaving small NCs in solution. Compared with the traditional nonsolvents-based precipitation technique, the current one is simpler and more rapid due to the avoidance of condensation and heating manipulations used in the traditional precipitation process. Moreover, the salts-based precipitation technique was generally available for the precipitation of aqueous nanoparticles, no matter if there were semiconductor NCs or metal nanoparticles. Simultaneously, the cost of the current method is also much lower than that of the traditional nonsolvents-based precipitation technique, making it applicable for mass purification of aqueous NCs.