一个原子学研究的粘附,反弹,和聚合物的破坏在碰撞的谷物与小聚合物的谷物
Maureen L Nietiadi1, Herbert M Urbassek2, Yudi Rosandi1
1Department of Geophysics, Universitas Padjadjaran, Jatinangor, Sumedang, 45363, Indonesia.
Scientific reports
|March 29, 2024
概括
分子动力学模拟显示,颗粒碰撞粘在反弹速度以下,反弹速度高于它. 这种反弹速度类似于谷物聚合物碰撞,并且高于分离速度,影响颗粒力学.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 计算科学 计算科学
背景情况:
- 颗粒状材料表现出复杂的碰撞行为.
- 了解谷物-谷物和谷物-聚合物的相互作用对于颗粒力学至关重要.
- 现有的理论可能无法完全捕捉小型聚合物中的碰撞动态.
研究的目的:
- 用分子动力学模拟来研究球形粒和小粒聚合物之间的中心碰撞.
- 为了确定粒粒和粒粒聚合物碰撞的反弹和分离速度.
- 分析聚合物破坏的能源需求,并与理论预测进行比较.
主要方法:
- 使用分子动力学模拟与莱纳德-斯潜力模型.
- 模拟单颗粒和小聚合物 (最多5颗粒) 之间的中心碰撞.
- 根据相对速度分析碰撞结果 (粘住,反弹,分离,破坏).
主要成果:
- 确定了一个不同的反弹速度,在此下,碰撞会坚持下去,在此以上,它们会反弹.
- 谷物聚合物碰撞显示出与谷物聚合物碰撞相似的反弹行为,对聚合物大小的依赖性微不足道.
- 发现反弹速度大约比分离速度高35%,归因于能量消耗.
- 聚合物破坏发生在更高的速度,最初是通过单体损失,然后是完全破坏,但没有与键断裂的直接比例.
结论:
- 这项研究提供了对颗粒碰撞的基本机制的见解,包括粘和弹跳行为.
- 能量消散在反弹和分离速度之间的差异中起着重要作用.
- 这些发现挑战了基于债券数量的总体破坏所需的能源的理论假设.
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