Porosity Retention
Porosity Retention - Related Videos
01:20
Porosity and Absorption of Aggregate
0 Views •
2024
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 aggregate...
01:18
Porosity in Cement Paste
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2024
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 critical—it...
13:02
Archimedes-Based Glycerol Displacement for Electrode Porosity Measurement in Lead-Acid Batteries
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2026
Here, we present a simple and low-cost glycerol displacement method based on Archimedes' principle for measuring lead-acid battery electrode porosities. The method demonstrates good reproducibility and is safer than traditional techniques, requiring low-hazard chemicals and equipment. Combining the technique with microstructural analysis by X-ray diffraction provides information on battery electrode properties and degradation.
11:52
Microbubble Fabrication of Concave-porosity PDMS Beads
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Cited by 2 •
2015
Procedures used to generate microstructured concave-porosity polydimethylsiloxane beads are presented. Effects of electrolyte concentration and identity within the aqueous phase are particularly emphasized.
02:42
Determination of the Calcium Retention Capacity of Isolated Mitochondria
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2025
This video demonstrates the procedure to assess mitochondrial calcium retention capacity by monitoring real-time changes in fluorescence as mitochondria uptake calcium. This assay is useful for studying mitochondrial function and calcium-related processes, including apoptosis and neurodegenerative diseases.
FAQs
As a porous material dries, liquid at the pore surface can generate capillary forces that pull the surrounding solid framework inward. If that framework lacks sufficient mechanical stability, pores may shrink or collapse, reducing accessible volume and altering the pore-size distribution. Drying conditions therefore matter because they can determine whether the final structure preserves its intended transport pathways.
Mechanical stability allows the solid framework to resist deformation during processing or use. Compression, drying-related stresses, and other physical changes can narrow pores, collapse fragile regions, or disrupt connections between pores. A material may retain some pore volume yet lose effective transport if its connected network is damaged, making framework strength important for sustained chemical performance.
Heating can cause shrinkage of the solid framework, while chemical treatment may alter surface chemistry or introduce material that blocks openings. These changes can reduce pore volume, modify the pore-size distribution, or limit access to internal surfaces. Evaluating the effects together is important because chemical functionality and structural preservation must remain compatible with the material’s intended role.
Retaining total pore volume does not necessarily preserve access throughout the material. Pores can remain present while connections narrow, become blocked, or disappear, restricting movement through the structure and limiting contact with internal surfaces. Porosity Retention therefore requires attention to both the amount of void space and the continuity of the pathways that connect it.
Evaluation compares the porous structure before and after a processing step or period of use, focusing on retained pore volume, pore-size distribution, and network connectivity. These measurements indicate whether drying, heating, compression, or chemical treatment caused collapse, shrinkage, or blockage. The resulting comparison links processing conditions with structural change and helps assess material reliability.
Preserved pores maintain accessible surface area and pathways for transport, which support the function of catalysts, adsorbents, membranes, electrodes, and related materials. If processing reduces access or connectivity, performance and durability may decline even when the material’s composition remains unchanged. Retention measurements therefore help chemists connect synthesis and processing choices with practical material behavior.