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Related Concept Videos

Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

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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.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
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Porosity in Cement Paste01:18

Porosity in Cement Paste

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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.
The balance of water to cement in the mix is...
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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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Permeability of Concrete01:25

Permeability of Concrete

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Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
173
Capillarity in Fluid01:19

Capillarity in Fluid

259
Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
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Total Voids in Concrete01:12

Total Voids in Concrete

138
Total voids in concrete encompass gel water volume, capillary pores, and entrapped air. Gel water (retained within the cement hydration products) and physically entrapped or adsorbed water are significant for the hydration process. For complete hydration, it's estimated that the space needed for the products of a cubic centimeter of cement doubles. Capillary pores constitute the unoccupied space within the hydrated cement paste, with their size largely influenced by the water-to-cement...
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Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications
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Liquids with Permanent Macroporosity.

Benjamin D Egleston1, Rebecca L Greenaway1

  • 1Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 82 Wood Lane, W12 0BZ, London, UK.

Angewandte Chemie (International Ed. in English)
|July 26, 2023
PubMed
Summary
This summary is machine-generated.

Researchers created a novel porous liquid with both micro and macropores. This material exhibits significant water uptake and tunable thermal conductivity, properties previously unseen in the liquid state.

Keywords:
Gas AdsorptionMacroporeMetal-Organic FrameworkPorous LiquidThermal Conductivity

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Permanent macropores have not been previously reported in the liquid state.
  • Porous liquids offer potential for novel material properties and applications.

Purpose of the Study:

  • To develop a synthetic strategy for creating a porous liquid with dual micro-macroporosity.
  • To investigate the properties of this novel porous liquid, including water uptake and thermal conductivity.

Main Methods:

  • Hierarchically porous particles were synthesized.
  • Particles were surface-coated and fluidised via dispersion.
  • Surface micropores were utilized to maintain permanent porosity through steric exclusion.

Main Results:

  • A novel porous liquid with both micro- and macropores was successfully prepared.
  • The material demonstrated a substantial water uptake capacity of 27% w/w.
  • The porous liquid exhibited switchable thermal conductivity upon water uptake.

Conclusions:

  • This study reports the first permanent macropores in a liquid state material.
  • The developed porous liquid exhibits unique properties, including high water uptake and tunable thermal conductivity.
  • These findings translate properties from porous solids to the liquid state, opening new avenues in materials science.