摘要
由于纳米粒子的表面效应,用传统的干燥方法干燥纳米粉体时极可能产生团聚结构。超临界流体干燥技术是制备具有高比表面积、孔体积、较低密度和低热导率的块状气凝胶和纳米粉体的重要途径之一。介绍了超临界流体的性质、超临界流体干燥技术的研究进展、超临界流体干燥的工艺与设备及过程的影响因素,阐述了超临界流体干燥技术在纳米材料制备中的应用,并指出了超临界流体干燥过程的控制技术及注意点,为进一步加强超临界流体干燥技术的理论研究和拓展超临界流体干燥技术的应用领域奠定了基础。
Due to surface effect, the aggregation of nanometer powder could be formed when using the conventional drying techniques. The supercritical fluid drying （ SCFD） technique is one of the most important ways to prepare aerogel and nanometer particle, which have high surface areas and pore volumes, low densities as well as low thermal conductivities. This paper introduced the properties of supercritical fluid, the study progress of supercritical fluid drying technique and the effect factors on the supercfitical fluid drying process, described the application of supercritical fluid drying technique on the preparation of nanometer materials, and pointed out the control technology and matters of needing attention. All these established a solid base to deepen the theoretical study and widen application for the supercritical fluid drying technique.
出处
《无机盐工业》
CAS
北大核心
2006年第10期1-4,共4页
Inorganic Chemicals Industry
关键词
超临界流体干燥
纳米粉体
表面效应
团聚
supercritical fluids drying
nanometer powder
surface effect
aggregation
