Laboratory Permeability Test
Laboratory Permeability Test - Related Videos
06:37
An Assay for Permeability of the Zebrafish Embryonic Neuroepithelium
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Cited by 11 •
2012
We describe a live whole animal quantitative measurement for permeability of the embryonic zebrafish brain. The technique analyzes the ability to retain cerebrospinal fluid and molecules of different molecular weights within the neural tube lumen and quantifies their movement out of the ventricles. This method is useful for determining differences in epithelial permeability and maturation during development and disease.
07:03
An in vivo Assay to Test Blood Vessel Permeability
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Cited by 335 •
2013
We are presenting an in vivo assay to test blood vessel permeability. This assay is based on intravenous injection of a dye and subsequent visualization of its diffusion into interstitial spaces.
01:25
Permeability of Concrete
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2024
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...
09:27
Encapsulation and Permeability Characteristics of Plasma Polymerized Hollow Particles
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Cited by 1 •
2012
We have used plasma enhanced chemical vapor deposition to deposit thin films ranging from a few nm to several 100 nm on nano-sized particles of various materials. We subsequently etch the core material to produce hollow nanoshells whose permeability is controlled by the thickness of the shell. We characterize the permeability of these coatings to small solutes and demonstrate that these barriers can provide sustained release of the core material over several days.
02:53
Blood-Brain Barrier Mimic Permeability Assay: An In Vitro Assay to Assess the Permeability of BBB Mimic to Tracer Molecules
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2023
This video describes a permeability assay to evaluate the permeability of in vitro blood-brain barrier using sodium fluorescein molecules.
FAQs
The hydraulic gradient provides the driving condition for fluid movement through the prepared specimen. By applying it in a controlled way and recording the resulting flow rate, the test relates the imposed hydraulic condition to the material’s hydraulic conductivity through Darcy’s law. This makes comparisons meaningful because permeability results correspond to defined testing conditions rather than uncontrolled flow.
Darcy’s law provides the relationship used to determine hydraulic conductivity from the flow behavior observed during testing. It connects the controlled hydraulic gradient, the specimen’s porous structure, and the measured flow rate in a quantitative framework. Engineers can therefore use the result to evaluate how water movement may affect drainage, seepage, consolidation, or groundwater flow.
Constant-head and falling-head procedures are alternative laboratory approaches for obtaining permeability-related measurements under a controlled hydraulic gradient. Their inclusion allows the test to represent flow using different head conditions while still applying Darcy’s law to interpret the result. The selected procedure should match the intended evaluation of the prepared soil or rock specimen and its expected engineering use.
The porous structure of soil or rock governs how readily water can pass through the specimen, so specimens with different structures can produce different hydraulic conductivity values under comparable conditions. Measuring flow through a prepared sample captures this structure-to-flow relationship. The resulting value helps connect material behavior with the performance of engineered systems exposed to seepage or drainage.
A basic workflow prepares a soil or rock specimen, applies a controlled hydraulic gradient, measures the resulting water flow rate, and determines hydraulic conductivity using Darcy’s law. The test may use a constant-head or falling-head procedure. Maintaining defined conditions throughout the measurement is important because the reported value is intended to characterize the specimen under those specified conditions.
Engineers use the results when water movement can influence the safety or performance of a geotechnical system. Relevant applications include assessing drainage and seepage, evaluating consolidation, and considering groundwater movement. The measurements support decisions involving foundations, earth dams, embankments, filters, and landfill liners by providing a quantified indication of how readily water can pass through the material.
The measured hydraulic conductivity indicates the material’s capacity to transmit water under defined laboratory conditions. In foundation, earth-dam, embankment, filter, or landfill-liner evaluations, that information helps engineers examine whether drainage, seepage, consolidation, or groundwater movement could affect performance. The test does not replace design assessment, but it supplies a material property needed for those engineering evaluations.