Particle Penetration Efficiency
Particle Penetration Efficiency - Related Videos
10:37
Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts
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Cited by 6 •
2016
The design-of-experiments procedure presented here allows the evaluation of different flocculants in terms of their ability to aggregate dispersed particles in plant extracts, thus reducing turbidity and the costs of downstream processing.
10:12
Construction of Cyclic Cell-Penetrating Peptides for Enhanced Penetration of Biological Barriers
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Cited by 5 •
2022
This protocol describes the synthesis of cyclic cell-penetrating peptides with aromatic cross-links and the evaluation of their permeability across biological barriers.
08:39
Shifting Zebrafish Lethal Skeletal Mutant Penetrance by Progeny Testing
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Cited by 8 •
2017
The goal of this protocol is to alter the penetrance of lethal skeletal mutant phenotypes in zebrafish by selective breeding. Lethal mutants cannot be grown to adulthood and bred themselves, therefore this protocol describes a method for tracking and selecting penetrance through multiple generations by progeny testing.
03:30
Inducing Penetrating Traumatic Brain Injury in Adult Drosophila Flies
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2025
This video demonstrates the induction of penetrating traumatic brain injury in the drosophila brain. Newly emerged flies are selected, anesthetized, and positioned under a fluorescence-equipped stereo microscope. The GFP-expressing mushroom body is identified, and a Minutien pin is inserted to cause injury. The flies are allowed to recover for further studies.
12:17
An In Vitro Caseum Binding Assay that Predicts Drug Penetration in Tuberculosis Lesions
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Cited by 24 •
2017
Here we describe a rapid equilibrium dialysis (RED) method to measure drug binding to caseum from pulmonary tuberculosis lesions and cavities. The protocol is also used with a foamy macrophage-derived matrix that is an effective surrogate to caseum.
FAQs
Particle size determines which capture mechanisms can act effectively within a barrier. Larger particles are more likely to be removed through inertial impaction or interception, while smaller particles are more affected by diffusion and, where present, electrostatic attraction. Consequently, a filter may show different penetration values across the particle-size range rather than one constant performance level.
These mechanisms remove particles in different ways. Inertial impaction causes particles to depart from the airflow path, interception occurs when moving particles contact filter structures, diffusion increases random contact for small particles, and electrostatic attraction draws particles toward charged surfaces. Their combined influence determines how effectively an engineered barrier captures airborne particles under operating conditions.
Airflow rate changes the conditions under which particles interact with a filter or porous material. Because penetration depends on airflow as well as particle size and filter structure, changing the flow can alter the balance among impaction, interception, diffusion, and electrostatic attraction. Engineers therefore compare performance at specified flow conditions rather than treating one result as universally applicable.
Filter structure provides the physical pathways and collection surfaces that particles encounter as air moves through the barrier. Its characteristics influence the opportunities for impaction, interception, diffusion, and electrostatic attraction. Studying penetration across different structures helps engineers evaluate material designs and identify configurations that improve particle capture while supporting required pressure and protection performance.
Measurement requires defined operating conditions and a comparison of airborne particles before and after passage through the filter or porous material. Particle size, airflow rate, and the barrier structure must be specified because each can change the result. The resulting fraction supports direct evaluation of filtration performance and comparison among engineered systems.
Engineers use particle penetration efficiency to assess air cleaners, respirators, industrial dust collectors, and pollution-control systems. The measurement helps connect material behavior with practical design decisions, including optimization of filter structures, prediction of pressure and protection performance, and selection of suitable barriers for controlling airborne particles in engineered environments.
Penetration measurements indicate how effectively a barrier limits the passage of airborne particles, including hazardous aerosols. This information supports exposure control in workplaces and buildings and contributes to environmental pollution-control applications. Interpreting results under relevant particle-size and airflow conditions helps determine whether a filter or system provides the intended level of protection.