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Related Concept Videos

Gas Solubility01:31

Gas Solubility

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Gas solubility in liquids forms liquid-gas solutions, such as soft drinks, where carbon dioxide is dissolved in water, and the ocean, where the solubility of oxygen and carbon dioxide supports marine life. The ability of oceans to dissolve gases impacts weather conditions in the troposphere.However, gas-liquid interactions vary. For instance, hydrogen chloride gas is highly soluble in water, while oxygen's solubility is much lower. Because these solutions are non-ideal, Raoult’s law,...
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Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
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Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
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Gas Exchange and Transport01:20

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Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
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In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
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Physical Principles Governing Gas Exchange01:16

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Gas behavior plays a vital role in understanding bodily processes such as external and internal respiration. External respiration involves the diffusion of oxygen into the blood and carbon dioxide out of it in the lungs. In contrast, internal respiration happens in body tissues, where these gases move in opposite directions.
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Covalent organic frameworks for gas storage and separation.

Yunjia Jiang1, Junyu Ren2, Yiwen Yuan1

  • 1Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua 321004, China. ybzhang@zjnu.edu.cn.

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Covalent organic frameworks (COFs) offer a sustainable alternative for gas storage and separation, outperforming traditional methods. This review highlights COF advancements in hydrogen, methane, and various gas mixture separations, focusing on adsorption technologies.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Conventional gas storage and separation methods are energy-intensive and costly.
  • Physical adsorption using porous materials is a low-energy alternative.
  • Covalent organic frameworks (COFs) are promising adsorbents due to their tunable properties and stability.

Purpose of the Study:

  • To review recent advancements in gas storage and separation using COF materials.
  • To emphasize adsorption-based methods and cover membrane technology.
  • To analyze COF structural design and enhancement strategies.

Main Methods:

  • Comprehensive literature review of COF applications in gas storage and separation.
  • Focus on adsorption mechanisms and performance.
  • Analysis of COF synthesis and modification strategies.

Main Results:

  • COFs show significant potential for hydrogen and methane storage.
  • COFs are effective for separating various gas mixtures, including CO2, SO2, SF6, H2/D2, NH3, CH4/N2, and O2/N2.
  • Structural design innovations and synthesis strategies enhance COF performance.

Conclusions:

  • COFs represent a highly promising class of materials for efficient and sustainable gas storage and separation.
  • Further research is needed to overcome challenges in translating COF technology to industrial applications.
  • Future developments in COF materials hold great potential for environmental and energy sustainability.