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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.
Adequate...
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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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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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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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Multimodal porous carbon derived from ionic liquids: correlation between pore sizes and ionic clusters.

Jun Hui Jeong1, Je Seung Lee, Kwang Chul Roh

  • 1Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea. kbkim@yonsei.ac.kr.

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This study introduces a sustainable method for creating multimodal porous carbons using ionic liquid mixtures. The ionic clusters act as porogens, enabling control over hierarchical structures for advanced materials.

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Area of Science:

  • Materials Science
  • Green Chemistry
  • Nanotechnology

Background:

  • Ionic liquids (ILs) offer tunable properties for material synthesis.
  • Developing porous carbons with controlled hierarchical structures is crucial for various applications.
  • Existing methods for synthesizing multimodal porous carbons can be complex and less sustainable.

Purpose of the Study:

  • To demonstrate a novel, sustainable synthesis of IL-derived multimodal porous carbons.
  • To investigate the role of ionic clusters of varying sizes as porogens in carbon formation.
  • To establish a method for systematically controlling the multimodal porous structure of carbons.

Main Methods:

  • Systematic investigation of carbonization behaviors of binary IL mixtures: 1-ethyl-3-methylimidazolium dicyanamide (EMIM-dca) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIM-Tf2N).
  • Utilizing ionic clusters of different sizes as porogens during synthesis.
  • Characterization of multimodal porous structures using quenched solid density functional theory.

Main Results:

  • Successful synthesis of IL-derived multimodal porous carbons with hierarchical structures.
  • Demonstrated that ionic clusters effectively act as porogens, influencing pore formation.
  • Established a correlation between ionic cluster size and the resulting carbon's porous architecture.

Conclusions:

  • Ionic liquid-based synthesis using ionic clusters as porogens is a simple, effective, and sustainable technique.
  • This method allows for systematic manipulation of multimodal porous carbon structures.
  • This work presents the first demonstration of controlling IL-derived porous carbon structures via ionic cluster porogens of varying sizes.