相关实验视频
Updated: Jun 4, 2025

05:58
Deposition of Porous Sorbents on Fabric Supports
Published on: June 12, 2018
6.5K
与相变材料相结合的多层防护服的易燃性和温度调节性能
Muhammad Shoaib1, Hafsa Jamshaid1, Rajesh Kumar Mishra2
1School of Engineering and Technology, National Textile University, Sheikhupura Road, Faisalabad 37610, Pakistan.
Materials (Basel, Switzerland)
|December 17, 2024
概括
采用相变材料 (PCM) 的新消防服显著提高了热保护和耐火性,同时提高了舒适度. 样本S1 (Nomex + PTFE + Nomex with PCM) 提供了卓越的性能,在各种条件下平衡了弹性和可穿戴性.
科学领域:
- 材料科学 材料科学 材料科学
- 织工程 织工程 织工程
- 防护服 技术 保护服 技术
背景情况:
- 当前的消防员西装虽然耐热,但损害了佩戴者的舒适性.
- 开发先进的防护面料对于消防员的安全和运营效率至关重要.
研究的目的:
- 设计和评估具有相变材料 (PCM) 的多层阻燃 (FR) 织物,以改进消防员防护服.
- 评估PCM对消防员面料的物理,热生理舒适性和耐火性能的影响.
主要方法:
- 制造四个多层FR织物样本,包括PCM集成和控制样本.
- 使用红外 (IR) 温度计,差分扫描热量计 (DSC),热保护测试 (TPP) 和稳定状态耐热测试进行评估.
- 测量物理性质 (面积密度,厚度) 和热生理特性 (空气透性,水分管理,导热性).
主要成果:
- 包括PCM在内显著提高了热保护和耐火性.
- 样本S1 (Nomex + PTFE + Nomex与PCM) 显示出优越的耐火性,空气透性 (比对照增加37.3%) 和热保护.
- PCM集成有效调节热传递,增强热调节和舒适.
结论:
- 有PCM插入的多层FR织物为消防员装备提供了卓越的热保护,耐火性和舒适性的平衡.
- 这些发现为设计适合各种气候条件的先进消防员防护服提供了有价值的指导方针.
- 优化的消防员防护面料可以在火灾事件中提高安全性和性能.
相关概念视频
Phase Changes
4.1K
Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
4.1K
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
States of Matter and Phase Changes
912
The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and...
912
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
Heating and Cooling Curves
22.5K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
22.5K
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

