Track Etching
Track Etching - Related Videos
06:58
Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
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2016
A method for electrochemically etching field emission tips is presented. Etching parameters are characterized and the operation of the tips in field emission mode is investigated.
11:17
Fundamental Technical Elements of Freeze-fracture/Freeze-etch in Biological Electron Microscopy
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Cited by 6 •
2014
Basic techniques and refinements of freeze-fracture processing of biological specimens and nanomaterials for examination by transmission electron microscopy are described. This technique is a preferred method for revealing ultrastructural features and specializations of biological membranes and for obtaining ultrastructural level dimensional and spatial data in materials sciences and nanotechnology products.
05:55
Multiple Object Tracking
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University In a staggeringly complex and engaging world, it is crucial to selectively process some stimuli at the expense of others. Experimental psychologists call this ability attention. Specifically, visual attention refers to the ability to selectively process aspects of a visual scene. Many paradigms used to study visual attention involve brief, punctuated, and repeated trials. However, everyday situations often place sustained demands...
06:19
Eye Tracking in Cognitive Experiments
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2023
Eye tracking as the name suggests involves tracking of eye-movements. It is a non-invasive, sensitive tool that quantifies and measures eye-movements to describe an individuals' cognitive state. An eye-movement between two fixation points is called a saccade, which is one of the fastest motor movements in our body. By observing the profiles of these eye movements, scientists can better understand neural deficits in patients with cognitive impairments. In this video, we will first look at an...
08:56
Custom Engineered Tissue Culture Molds from Laser-etched Masters
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Cited by 8 •
2018
Herein we present a rapid, facile, and low-cost method for fabricating custom polydimethylsiloxane molds that can be used for producing hydrogel-based engineered tissues with complex geometries. We additionally describe results from mechanical and histological assessments conducted on engineered cardiac tissues produced using this technique.
FAQs
Architecture reflects two controllable stages: irradiation establishes the number and distribution of damage paths, while chemical treatment determines how extensively those regions are opened into pores. Varying these conditions changes pore size and density, allowing a membrane to be matched to a desired separation or transport task.
High-energy ions disrupt polymer bonds along narrow trajectories, leaving those paths more chemically vulnerable than the surrounding film. The etchant therefore removes material preferentially along the damaged regions rather than dissolving the membrane uniformly. This selective removal converts invisible radiation tracks into defined channels while preserving the broader film structure.
Pore size and density determine how much membrane area is available for passage and how closely the channels are distributed. Controlling both features helps regulate filtration and the movement of biomolecules, while also supporting reproducible experimental conditions. Researchers can consequently compare biological responses using membranes with deliberately adjusted architectures.
Researchers adjust irradiation and etching conditions to produce membrane architectures suited to a particular biological purpose. A design emphasizing controlled passage can support filtration or biomolecule transport, whereas a reproducible pore arrangement can provide a platform for cell culture and tissue-engineering studies. The same processing principle therefore supports several experimental formats.
The process begins by exposing a polymer film to high-energy ions, which create narrow radiation-damage paths. The film is then treated with a chemical etchant that removes the damaged regions faster than undamaged material. Adjusting the irradiation and etching stages changes the resulting pore size and density for the intended application.
These membranes are useful when an experiment requires controlled separation, filtration, or transport through a solid barrier. Their uniform pores also support reproducible cell-culture platforms and tissue-engineering studies. In each case, the membrane provides a defined architecture whose pore characteristics can be tailored to the biological question or processing requirement.