Supercritical Antisolvent Precipitation of Nanoparticles of Superconductor Precursors
Supercritical Antisolvent Precipitation of Nanoparticles of Superconductor Precursors
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DOI：
10.1021/ie970510a
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发表时间：
1998-01
影响因子：
4.2
通讯作者：
E. Reverchon;G. Porta;A. Trolio;S. Pace
中科院分区：
文献类型：
--
作者：
E. Reverchon;G. Porta;A. Trolio;S. Pace
超临界抗溶剂沉淀（SAS）是基于液体溶液在超临界流体中的快速溶解。这项技术已经被测试用于生产纳米钇，钐和钕醋酸盐，用作高温超导体的前体。在液体溶液的不同膨胀水平下产生了各种形态的颗粒。在非常大的膨胀水平下获得了低至约100 nm的纳米颗粒，而在中间膨胀水平下产生了直径为几微米的非常大的聚集体（气球）。研究了几种工艺参数对颗粒粒径和粒径分布的影响。在SAS工艺参数中，测试了压力、温度、液体溶液浓度和不同液体溶剂。
Supercritical antisolvent precipitation (SAS) is based on the fast dissolution of a liquid solution in a supercritical fluid. This technique has been tested to produce nanoparticles of yttrium, samarium, and neodymium acetates to be used as precursors of high-temperature superconductors. Particles of various morphologies were produced at different expansion levels of the liquid solution. Nanoparticles down to about 100 nm were obtained at very large expansion levels, whereas very large aggregates (balloons) with the diameter of several microns were produced at intermediate expansion levels. The influence of several process parameters on particle diameter and particle size distribution was studied. Among SAS process parameters, pressure, temperature, concentration of the liquid solution, and different liquid solvents were tested.