精确定义和测量粒子性质的必要性

Standards Pub Date : 2021-08-12 DOI:10.3390/standards1010004
Yimin Deng, R. Dewil, L. Appels, Huili Zhang, Shuo Li, J. Baeyens
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引用次数: 10

摘要

在处理粉末时,对其物理参数的基本知识是必不可少的,在文献中提出了不同的方法和途径。得到的结果差异很大,重要的是确定适用的标准,无论是对调查方法还是对实验结果的解释。本研究旨在提出这些标准,同时确定应遵守的一般规则。首先,对粒径的确定问题进行了研究。人们发现,描述一个粒子的大小并不像人们想象的那么简单。非球性和尺寸分布的因素使得不可能将“尺寸”放在一个数字中。虽然筛分可用于尺寸超过约50微米的较粗颗粒,但仪器技术的尺寸范围很广。对于细颗粒,需要克服粘结力的发生,需要使用溶剂、分散剂和样品混合。其次,检查颗粒的形状。通过定义球形度,可以描述不规则形状的粒子。最后,探讨了粒子密度、粒子组合密度和它们的空隙率(空隙的体积分数)以及研究它们的不同方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Need to Accurately Define and Measure the Properties of Particles
When dealing with powders, a fundamental knowledge of their physical parameters is indispensable, with different methods and approaches proposed in literature. Results obtained differ widely and it is important to define standards to be applied, both toward the methods of investigation and the interpretation of experimental results. The present research intends to propose such standards, while defining general rules to be respected. Firstly, the problem of defining the particle size is inspected. It was found that describing the size of a particle is not as straightforward as one might suspect. Factors of non-sphericity and size distributions make it impossible to put ‘size’ in just one number. Whereas sieving can be used for coarser particles of a size in excess of about 50 µm, instrumental techniques span a wide size range. For fine particles, the occurrence of cohesive forces needs to be overcome and solvents, dispersants and sample mixing need to be applied. Secondly, the shape of the particles is examined. By defining sphericity, irregularly shaped particles are described. Finally, the density of particles, of particle assemblies and their voidage (volume fraction of voids) and the different ways to investigate them are explored.
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