相关实验视频
Updated: Jun 26, 2025

Visualization of High Speed Liquid Jet Impaction on a Moving Surface
Published on: April 17, 2015
在非平衡超音速流量条件下,高速水在石墨上的初始粘合
Kevin D Gibson1, Yuheng Luo2, Christopher Kang2
1The James Franck Institute and Department of Chemistry, The University of Chicago, 929 East 57th Street, Chicago, Illinois 60637, USA.
这项研究通过实验和模拟研究了水分子粘在冷表面上的情况. 它揭示了高速冲击期间的能量交换如何影响凝结.
科学领域:
- 表面科学是一门学科.
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
背景情况:
- 了解气体表面相互作用对于薄膜沉积和大气现象等过程至关重要.
- 分子在寒冷表面的初始粘合是控制凝结和材料生长的基本过程.
研究的目的:
- 为了研究重水 (D2O) 在低温冷却的石墨表面上的初始粘合.
- 阐明转换能量,流量和发生角度在D2O粘合中的作用.
- 探索气体与表面碰撞过程中的能量交换机制及其对冷凝的影响.
主要方法:
- 使用超音速分子束进行超高真空 (UHV) 气体表面散射实验.
- 低温冷却的高度定向的烧解石墨 (HOPG) 晶体作为目标表面.
- 飞行时间 (TOF) 测量以分析分散的D2O和原子 (Ne) 进行能量交换.
- 分子动力学 (MD) 模拟来补充关于能量转移的实验发现.
主要成果:
- 通过测量分散的D2O作为表面温度的函数,在非平衡条件下确定D2O粘附的开始.
- 使用 (He) 射线散射评估表面结构和覆盖信息.
- 在不同温度下,D2O与石墨表面之间的量化能量交换.
- 将D2O结果与原子Ne进行比较,以了解分子自由度的影响.
结论:
- 气体表面能量转移和分子自由度显著影响D2O在寒冷表面的粘结和凝结.
- 这项研究提供了与凝结过程相关的高速度气体表面相互作用的基本见解.
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