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関連する概念動画

Porosity in Cement Paste01:18

Porosity in Cement Paste

553
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...
553
Permeability of Concrete01:25

Permeability of Concrete

634
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...
634
Total Voids in Concrete01:12

Total Voids in Concrete

1.2K
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...
1.2K
Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

950
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...
950
Types of Fluids01:27

Types of Fluids

1.2K
Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
1.2K
Characteristics of Fluids01:20

Characteristics of Fluids

8.8K
When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
8.8K

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関連する実験動画

Updated: Mar 30, 2026

Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications
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Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications

Published on: January 16, 2018

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永続的な多孔性の液体

Nicola Giri1, Mario G Del Pópolo2,3, Gavin Melaugh2

  • 1School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK.

Nature
|November 13, 2015
PubMed
まとめ
この要約は機械生成です。

研究者らは 永久の多孔性を持つ 流動性のある液体を開発し 二酸化炭素の捕獲などの 固体材料の限界を克服しました これらの新型の多孔性液体は,化学プロセスとガス溶解性において重要な利点を提供します.

さらに関連する動画

Microbubble Fabrication of Concave-porosity PDMS Beads
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Microbubble Fabrication of Concave-porosity PDMS Beads

Published on: December 15, 2015

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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

Published on: February 11, 2020

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関連する実験動画

Last Updated: Mar 30, 2026

Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications
08:38

Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications

Published on: January 16, 2018

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Microbubble Fabrication of Concave-porosity PDMS Beads
11:52

Microbubble Fabrication of Concave-porosity PDMS Beads

Published on: December 15, 2015

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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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科学分野:

  • 材料科学
  • 化学工学
  • 超分子化学

背景:

  • ゼオライトや金属有機フレームワークのような有孔な固体は分離と触媒に価値がありますが,従来のフローシステムでは実装の課題に直面しています.
  • 液体溶媒は,二酸化炭素の捕獲など,既存のインフラへの統合が容易であるため,一部の用途で好ましい.
  • 重要な課題は 流動性を 永続的な多孔性と組み合わせることで 先進的な化学処理に 取り組むことです

研究 の 目的:

  • 恒久的な多孔性によって決定される 質量特性を有する 流動性のある液体を作る
  • 伝統的な固体吸着剤の限界を克服する新型の多孔性材料を開発する.
  • 分子分離,触媒,ガスの貯蔵における新しい可能性を可能にします.

主な方法:

  • よく定義された毛穴空間を持つケージ分子の設計.
  • 孔に入るには大きすぎる溶媒のケージ分子の高溶性.
  • 商用反応剤から高度に溶解する"スクランブル"の毛細いケージの合成.

主要な成果:

  • 収容されていないケージの高濃度 (約. 通常の溶液より500倍も大きい).
  • メタンガスの溶解度が 8倍になったことが示されました
  • 多孔質の液体材料のスケーラブルな1段階合成経路を開発した.

結論:

  • 機能的な多孔性物質の新種を導入しました 自由に流れる多孔性液体です
  • 設計原理は溶媒に溶けないケージ分子に焦点を当てて,孔の浸透を防ぎます.
  • これらの材料は,高度な化学分離とプロセスのための有望なプラットフォームを提供します.