基于的无火焰配料加热器激活后结构变化和内部激活器运输行为的研究:实验和分子动力学模拟
Kai Si1, Chongxin Liu1, Dequan Zhang1
1Institute of Food Science and Technology, Chinese Academy of Agriculture Sciences, Key Laboratory of Agro-Products Quality and Safety Control in Storage and Transport Process, Ministry of Agriculture and Rural Affairs, Beijing 100193, China.
ACS omega
|September 4, 2023
概括
基于的无火焰配料加热器 (AFRH) 由于激活器在孔隙通道中的吸附,反应效率较低. 分子动力学模拟显示,表面相互作用阻碍了扩散,影响了性能.
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.
- 物理化学 物理化学
背景情况:
- 基于的无火焰配料加热器 (AFRHs) 使用与水的外热反应来加热食物.
- 之前的研究表明AFRHs的反应效率低于最佳,需要进一步调查.
研究的目的:
- 研究不同AFRH层的材料特性和反应效率.
- 使用分子动力学阐明低反应效率背后的微观机制.
主要方法:
- 用X射线衍射和扫描电子显微镜进行材料表征.
- 用于性能分析的气和热量生成测量.
- 在三酸孔通道中模拟激活器行为的分子动力学模拟.
主要成果:
- 在AFRH层 (外部,内部,中间) 中观察到分层和热产能.
- 发现外层和内层的反应效率很低 (分别为64%和80%).
- 分子动力学显示,由于表面相互作用,孔隙通道内的激活剂吸附强,扩散系数低.
结论:
- 微观的表面吸附现象显著降低了AFRHs中的激活器流动性和反应效率.
- 了解这些相互作用为优化AFRH设计和性能提供了基础.
相关概念视频
01:14Mechanisms of Heat Transfer
360
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
360
01:20Mechanisms of Heat Transfer II
3.3K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
3.3K
01:19Mechanism of heat transfer
1.2K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.2K
01:14Mechanisms of Heat Transfer I
4.3K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
4.3K
02:14Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes
6.4K
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
6.4K
01:16Flame Photometry: Lab
274
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
274