Porosity Control
Porosity Control - Related Videos
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.
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...
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.
FAQs
Pore volume alone does not determine performance; pore size, distribution, and connectivity also matter. A material with connected pores can support fluid transport, whereas limiting or altering connections changes permeability and fluid absorption. The same internal structure also affects mechanical and thermal behavior, so engineers must select pore characteristics according to whether strength, insulation, flow, or absorption is the priority.
Particle packing, compaction pressure, solvent removal, foaming, and sintering temperature influence how voids form and remain within a material. Tighter packing or greater compaction can limit void formation, while foaming promotes it. Solvent removal and sintering provide additional ways to adjust the final pore structure, allowing processing conditions to be matched to desired density, permeability, or strength.
Changes that favor one property may reduce another. More or better-connected pores can support permeability, fluid absorption, or lower density, while limiting voids can support mechanical performance and a denser structure. Engineers therefore adjust pore characteristics rather than pursuing maximum or minimum porosity alone. The appropriate balance depends on the required combination of strength, transport, insulation, and weight.
Engineers first relate the intended function to the required material behavior, such as permeability for filtration, low density for lightweight structures, or insulation for thermal applications. They can then modify composition and choose among packing, compaction, solvent removal, foaming, or sintering adjustments. This selection links the processing route to the desired pore volume, structure, and connectivity.
Porosity Control applies across ceramics, metals, polymers, and composites, although the relevant composition and processing conditions differ between material classes. Strategies may promote or limit void formation depending on the intended result. Considering the material type helps engineers use pore adjustment to balance properties such as mechanical behavior, thermal response, density, permeability, and fluid absorption.
Engineers use controlled pore structures in filtration, lightweight structures, insulation-related designs, energy systems, and biomedical devices. Filtration emphasizes suitable fluid transport, while lightweight structures emphasize reduced density. Energy and biomedical applications may require carefully balanced mechanical, thermal, transport, or absorption behavior. Porosity Control provides a way to tailor these competing requirements within ceramics, metals, polymers, and composites.