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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

613
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...
613
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

2.8K
In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
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Related Experiment Video

Updated: May 2, 2026

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Gas separation using porous cement membrane.

Weiqi Zhang, Maria Gaggl, Gregor J G Gluth

    Journal of Environmental Sciences (China)
    |March 22, 2014
    PubMed
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    This study demonstrates that cementitious materials can effectively separate gas mixtures, offering a low-cost, durable solution for hydrogen purification and carbon dioxide capture. Researchers explored various cement membranes to find optimal conditions for efficient gas separation.

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    Area of Science:

    • Materials Science
    • Chemical Engineering
    • Environmental Science

    Background:

    • Gas separation is crucial for industrial applications, including clean fuel technologies like hydrogen and environmental solutions such as carbon dioxide capture.
    • Inorganic membranes are recognized for their effectiveness in gas separation, with cementitious materials offering advantages of low cost and durability.
    • Existing research highlights the need for efficient and cost-effective gas separation technologies.

    Purpose of the Study:

    • To investigate the influence of gas molecule properties on transport through cement membranes.
    • To explore how operating conditions and membrane composition affect gas separation efficiency.
    • To identify optimal conditions and cement membrane types for effective gas mixture separation.

    Main Methods:

    • Development and improvement of an experimental setup for testing cement membranes.
    • Measurement of gas transport properties across twenty different cement membranes.
    • Systematic variation of operating conditions and membrane compositions to assess separation performance.

    Main Results:

    • Cementitious materials exhibit the ability to separate gas mixtures.
    • The study identified specific operating conditions and cement membrane types that enhance separation efficiency.
    • The gas transport mechanism through cementitious materials was investigated and elucidated.

    Conclusions:

    • Cement-based inorganic membranes present a viable, cost-effective technology for gas separation.
    • The findings provide insights into optimizing cement membrane performance for applications like hydrogen purification and CO2 capture.
    • Further research into the gas transport mechanism can lead to improved membrane design.