关于CL-20由水蒸气诱导的固体-固体相变的机制研究
Ya Guo1, Xuetong Cai1, Fangbao Jiao1
1Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China. guoya@caep.cn.
Physical chemistry chemical physics : PCCP
|January 23, 2025
概括
水蒸气触发了能量材料六二氧化 (CL-20) 中不可逆转的相位过渡,降低了它的稳定性和能量. 这项研究揭示了该机制,对于设计更安全的CL-20爆炸物至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 晶体学 晶体学是指结晶学.
背景情况:
- 像六二氧化 (CL-20) 这样的能量材料存在于各种多态,影响性能.
- CL-20是一种强大的爆炸物,但其应用受到水蒸气诱导的相位过渡的限制,这增加了灵敏度并减少了能量.
研究的目的:
- 研究由水蒸气诱导的CL-20的固体-固体相位过渡行为.
- 阐明这种由水引起的相位过渡背后的机制.
- 为设计稳定的基于CL-20的能量材料提供理论基础.
主要方法:
- 在水蒸气影响下对CL-20相变的实验研究.
- 进行X射线衍射 (XRD) 分析以表征相位变化.
- 使用四参数模型进行相位过渡动力学分析.
- 支持实验发现的理论计算.
主要成果:
- 在水蒸气的存在下,CL-20在104°C时经历不可逆转的e-α相过渡.
- 这种过渡温度明显低于仅仅通过热刺激引起的过渡温度.
- 建立了一个四参数模型来描述水诱导相变的动力学.
- 理论计算证实了水分子对过渡的促进作用.
结论:
- 水蒸气显著降低了过渡温度,并促进了CL-20中不可逆转的ε到α相过渡.
- 在CL-20中提出了一种蒸汽诱导的固体-固体相变的机制.
- 了解这种过渡对于抑制多态过渡和在基于CL-20的材料中获得所需相来说至关重要.
更多相关视频
06:26Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
Published on: May 15, 2017
7.1K
11:38In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
Published on: February 1, 2020
15.8K
相关概念视频
Phase Diagrams
39.5K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
39.5K
Phase Transitions: Vaporization and Condensation
17.2K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
17.2K
Phase Transitions
18.7K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
18.7K
Phase Diagram
5.7K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
5.7K
Phase Transitions: Sublimation and Deposition
16.7K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
16.7K
States of Water
50.5K
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
50.5K
