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相关概念视频

Heat Capacities of an Ideal Gas I01:14

Heat Capacities of an Ideal Gas I

4.3K
Heat capacity is the ratio of heat absorbed by the substance corresponding to its temperature change. It is also called thermal capacity and the SI unit of heat capacity is J/K. Whereas, specific heat capacity is defined as the amount of heat necessary to change the temperature of 1 kg of a substance by 1 K and is also called massic heat capacity. Its SI unit is J/kg⋅K.
Molar heat capacity quantifies the ratio of the amount of heat added (or removed) to increase (or decrease) the...
4.3K
Heat Capacities of an Ideal Gas II01:23

Heat Capacities of an Ideal Gas II

3.8K
For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system's internal energy and not for doing any kind of work. While for a system undergoing a thermodynamic process under a constant pressure condition, the amount of heat absorbed is used not only for increasing the internal energy (as a function of temperature) but also for doing some work. The molar heat capacity is the amount of heat required to increase the...
3.8K
Heat Capacities of an Ideal Gas III01:25

Heat Capacities of an Ideal Gas III

3.4K
The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is
3.4K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.2K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.2K
Network Covalent Solids02:18

Network Covalent Solids

16.2K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.2K
Heating and Cooling Curves02:44

Heating and Cooling Curves

28.0K
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...
28.0K

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Updated: Feb 7, 2026

Characterization of Thermal Transport in One-dimensional Solid Materials
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气体-固体相互作用影响纳米粒子材料中的导热.

Mingyang Yang1,2, Bo Yang1, Yu Xu3

  • 1School of Resources Engineering, Xi'an University of Architecture and Technology, No.13 Yanta Road, Xi'an 710055, China.

Langmuir : the ACS journal of surfaces and colloids
|February 6, 2026
PubMed
概括
此摘要是机器生成的。

纳米孔状材料在吸附天然气 (ANG) 储存方面表现有前途. 这项研究使用多尺度模拟量化了气体-固体合效应,揭示了影响热传递和甲吸附的不同压力模式.

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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.
  • 热力学是一种热力学.

背景情况:

  • 纳米孔状材料具有较高的表面积和较低的导热率,使它们适合吸附天然气 (ANG) 储存.
  • 在不同温度和压力下精确量化气体-固体合对于优化ANG储存至关重要,但传统模型面临局限性.

研究的目的:

  • 开发一种多尺度的方法来量化气体-固体合效应,用于NG储存的纳米孔状材料.
  • 改进吸附模型并确定气体-固体合面积的相关性.
  • 在含甲的多孔介质中创建有效导热率的预测模型.

主要方法:

  • 利用纳米级的分子动力学 (MD) 模拟来分析甲吸附,热导率和气体-固体合.
  • 开发了一种精细的朗穆尔吸附模型和气体-固体合面积的定量相关性.
  • 构建了一个宏观的有效导热模型,其中包含了气体-固体合效应.

主要成果:

  • MD模拟提供了关于甲吸附能力,有效导热率和气体-固体合受温度和压力影响的定量数据.
  • 确定了不同的压力模式:低压 (<2.1 × 10^5 Pa) 主要由固体传热,高压 (>2.1 × 10^5 Pa) 气体-固体相互作用显著增加.
  • 建立了气体-固体合面积的定量相关性和有效导热率的预测模型.

结论:

  • 多尺度方法准确地量化了NG存储纳米孔质材料中的气体-固体合效应.
  • 气体-固体合显著影响热导率和吸附,其重要性与压力明显不同.
  • 这些发现为设计先进的ANG存储系统提供了基础,通过优化材料特性和操作条件.