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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.
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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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Microbubble Fabrication of Concave-porosity PDMS Beads
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Ordered porous materials for emerging applications.

Mark E Davis1

  • 1Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA. mdavis@cheme.caltech.edu

Nature
|June 21, 2002
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Summary
This summary is machine-generated.

Scientists are advancing the creation of novel porous materials with ordered structures. These engineered materials offer unique properties, expanding applications beyond traditional uses into fields like microelectronics and medical diagnostics.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Controlling the architecture of porous materials is crucial for advanced applications.
  • Recent decades show significant progress in fabricating ordered porous solids.
  • Porous materials are moving beyond traditional roles as catalysts and adsorbents.

Purpose of the Study:

  • To highlight advances in the fabrication of porous materials.
  • To explore the expanding applications of these materials.
  • To discuss the control over pore size, shape, and uniformity.

Main Methods:

  • Fabrication of new porous solids with ordered structures.
  • Characterization of material properties and pore uniformity.
  • Exploration of diverse material compositions.

Main Results:

  • Significant advances in creating ordered porous solids.
  • Development of materials with unusual and tunable properties.
  • Broadened application scope for porous materials.

Conclusions:

  • Porous materials offer unprecedented control over nanoscale environments.
  • These materials are poised to impact diverse technological fields.
  • Future applications include microelectronics and advanced medical diagnostics.