Influence of guest and host particle sizes on dry coating effectiveness: When not to use high mixing intensity
Influence of guest and host particle sizes on dry coating effectiveness: When not to use high mixing intensity
复制标题
客体和主体粒径对干涂层效果的影响：何时不使用高混合强度
DOI：
10.1016/j.powtec.2020.02.059
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发表时间：
2020
影响因子：
5.2
通讯作者：
Davé, Rajesh N.
中科院分区：
文献类型：
--
作者：
Zheng, Kai;Kunnath, Kuriakose;Ling, Zhipeng;Chen, Liang;Davé, Rajesh N.
使用高强度振动混合器，使用 KCl、玉米淀粉、硅酸铝和纳米二氧化硅，研究了材料硬度、主体和客体颗粒尺寸以及混合强度对干涂层质量的影响。在高加工强度和高材料刚度下，涂层质量随着客体粒径的增大而恶化。超过一定的混合强度，粗的客体颗粒会与主体颗粒分离，表明不建议使用更高的强度；例如，玉米淀粉的最佳涂层质量适用于强度低于 30 Gs 的中型宿主。然而，对于纳米二氧化硅客体，较高的加工强度并没有导致它们的分离，而是减少了它们的团聚。使用基于能量的粘/弹跳模型和两个指数来解释这种行为。涂层质量指数（Kc），即总脱离能与相对动能的比值，评估了客体颗粒的附着倾向。解团聚指数（Kd），即解团聚能量与相对动能的比值，评估了客体颗粒的团聚趋势。
The effects of material stiffness, host and guest particle sizes, and mixing intensity on dry coating quality were investigated using a high-intensity vibrational mixer, using KCl, cornstarch, aluminum silicate and nano-sized silica. The coating quality deteriorated with larger guest particle size at high process intensity, and high material stiffness. Coarse guest particles detached from host particles above certain mixing intensity, indicating higher intensity is not recommended; e.g., the best coating quality for cornstarch was for medium-sized hosts below 30 Gs intensity. However, for nano-silica guests, higher processing intensity did not lead to their detachment, but decreased their agglomeration. Such behavior was explained using the energy-based stick/bounce model and two indices. The coating quality index (Kc), the ratio of total detachment energy to relative kinetic energy, assessed the guest particle attachment tendency. The deagglomeration index (Kd), the ratio of deagglomeration energy to relative kinetic energy, assessed the guest particle agglomeration tendency.