Network Porosity
Network Porosity - Related Videos
01:20
Porosity and Absorption of Aggregate
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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...
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.
10:28
Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique
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Cited by 1 •
2023
A simple and cost-efficient fabrication method based on the solvent evaporation technique is presented to optimize the performance of a soft capacitive pressure sensor, which is enabled by porosity control in the dielectric layer using different mass ratios of the molding PDMS/toluene solution.
09:22
Casting Protocols for the Production of Open Cell Aluminum Foams by the Replication Technique and the Effect on Porosity
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Cited by 22 •
2014
Replication is one of the processing techniques used for the production of porous metal sponges. In this paper one implementation of the method for the production of open celled porous aluminum is shown in detail.
FAQs
Connectivity determines whether void spaces form continuous routes for molecules, fluids, or cells. Tortuosity describes how indirect those routes are, so transport may follow longer pathways rather than moving straight through the material. Evaluating both features helps explain why materials with similar total pore volume can produce different diffusion and fluid-permeation behavior.
A high total void fraction does not indicate how effectively those spaces communicate. Pore size, connectivity, and tortuosity jointly determine whether molecules, nutrients, waste products, or cells can move through the network. Consequently, two materials with comparable porosity may differ in transport performance and may not provide equivalent conditions for engineered biological systems.
The void architecture influences how an engineered material responds when mechanical loads are applied. Changes in pore size, connectivity, and the amount of void space can alter the relationship between transport capacity and structural stability. Bioengineers therefore evaluate porosity under specific loading conditions rather than treating transport performance and mechanical behavior as independent properties.
Tuning requires balancing interconnected void space against the need for structural stability. Increasing or reorganizing the network may improve pathways for diffusion or fluid permeation, while the resulting architecture can also change mechanical behavior. The appropriate balance depends on whether the material must support nutrient transport, waste removal, controlled release, or cell movement.
In tissue-engineering scaffolds, measuring and tuning the network helps create pathways for nutrient transport and waste removal. Pore size and connectivity also affect how cells move through the engineered structure, while the overall architecture must remain mechanically stable. Porosity therefore serves as a design variable for coordinating biological transport with scaffold integrity.
The interconnected network influences how molecules move through hydrogels and how substances are released from drug-delivery systems. Pore size, connectivity, and tortuosity shape diffusion and fluid permeation, allowing engineers to adjust transport behavior while considering mechanical stability. This makes network architecture relevant when designing systems intended for controlled release rather than unrestricted movement.
Filtration and cell-separation devices depend on engineered void pathways to regulate movement through the material. Network characteristics influence fluid permeation and the passage of molecules or cells, while pore architecture determines how continuous and indirect those routes are. Measuring these features helps relate device structure to its intended transport or separation function.
Measurement provides more than a single estimate of empty volume. It helps characterize the network’s pore size, connectivity, and tortuosity, which together indicate how the material may support diffusion, fluid permeation, and cell movement. Comparing these features with mechanical behavior under relevant loading conditions guides adjustments for scaffolds, hydrogels, delivery systems, and separation devices.