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首页> 外文期刊>Journal of Materials Science >An improved method for the matrix dissolution extraction of nanoparticles from microalloyed steel
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An improved method for the matrix dissolution extraction of nanoparticles from microalloyed steel

机译：微合金钢纳米粒子基质溶解萃取的改进方法

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摘要

The chemical extraction of niobium and titanium carbonitride precipitates from microalloyed steels was studied. Steel samples and chemically synthesized reference nanoparticles were subjected to commonly used extraction protocols, and conditions were systematically varied. High acid concentrations led to particle etching with losses above 10%; long extraction times and small etchant volumes led to the formation of dense SiOx networks that engulfed the extracted particles. The addition of surfactants was found to reduce agglomeration and limit etching. We developed an optimized extraction protocol that can extract and retain particles with diameters below 10nm with reduced etching and negligible network formation. The resulting particle dispersions are suitable both for efficient electron microscopy of large particle numbers in a single run and colloidal analysis of large numbers of particles in dispersion.
机译：研究了微合金化钢的铌和碳氮化钛沉淀物的化学提取。 对钢样品和化学合成的参考纳米颗粒进行常用的提取方案，系统地改变条件。 高酸浓度导致颗粒蚀刻，损耗高于10％; 长萃取时间和小型蚀刻剂量导致形成浓密的SiOx网络，吞噬萃取的粒子。 发现添加表面活性剂以减少聚集并限制蚀刻。 我们开发了一种优化的提取方案，可以通过降低的蚀刻和可忽略的网络形成，在10nm以下的直径下方提取和保留颗粒。 所得颗粒分散体适合于在单次运行中的大量颗粒数的高效电子显微镜，以及大量分散体的胶体分析。

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