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Related Concept Videos

Pore Size Distribution01:23

Pore Size Distribution

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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Carbon Dioxide Transport in the Blood01:19

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Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
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Porosity and Absorption of Aggregate01:20

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Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
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Porosity in Cement Paste01:18

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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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The Carbon Cycle01:14

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Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
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Pore Characteristics for Efficient CO2 Storage in Hydrated Carbons.

Muqing Ren, Marta Sevilla1, Antonio B Fuertes1

  • 1Instituto Nacional del Carbon (CSIC), Francisco Pintado Fe 26, Oviedo 33011, Spain.

ACS Applied Materials & Interfaces
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Summary

New porous carbons capture carbon dioxide (CO2) efficiently by utilizing a combination of micropores and mesopores. This method enhances CO2 storage capacity, outperforming traditional CO2-hydrate formations.

Keywords:
absorptioncarbon dioxide capturecarbon nanotechnologygas hydratesmechanismpore sizeporous carbons

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Carbon dioxide (CO2) capture is crucial for mitigating climate change.
  • Gas-hydrate crystallization in confined porous media is an emerging CO2 capture technology.
  • Pore characteristics significantly influence CO2 capture efficiency.

Purpose of the Study:

  • To investigate the impact of pore dimensions and surface functionality of porous carbons (PCs) on CO2 capture efficiency.
  • To evaluate CO2 uptake performance in dry and hydrated PCs under high pressure.
  • To understand the mechanism behind enhanced CO2 capture capacity in hydrated PCs.

Main Methods:

  • Synthesized and characterized porous carbons with varying pore sizes (supermicropores to mesopores) and surface properties (hydrophilic to hydrophobic).
  • Imbibed water into PCs and measured CO2 uptake at pressures up to 54 bar.
  • Analyzed H2O-to-carbon and H2O/CO2 molar ratios to determine capture efficiency and mechanism.

Main Results:

  • Porous carbons with a wide pore size distribution (micropores and mesopores) exhibited significantly higher CO2 capture capacity.
  • Achieved a low H2O/CO2 molar ratio of 1.8, surpassing conventional CO2-hydrate formations (5.72).
  • CO2 capture in micropores (<2 nm) occurs in gaseous form, blocked by hydrate formations in larger mesopores.
  • Microporous/supermicroporous PCs showed no hysteretic CO2 uptake, indicating no hydrate formation within 1-2 nm pores.
  • High nitrogen content in PCs inhibited CO2 hydrate formation.

Conclusions:

  • A combination of micropores and mesopores in PCs is essential for efficient high-pressure CO2 capture via hydrate-blocking mechanism.
  • The developed method offers superior CO2 capture and storage capacity compared to traditional CO2-hydrate systems.
  • Surface chemistry, particularly nitrogen functional groups, can be leveraged to control or prevent CO2 hydrate formation.