Capillary Breakup Elongational Rheometer
Capillary Breakup Elongational Rheometer - Related Videos
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Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
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Transcription Elongation Factors
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Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
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Capillary Electrophoresis (CE)
0 Views •
2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Capillary electrophoresis (CE) is a separation technique that separates molecules in an electric field according to size and charge. CE is performed in a small glass tube called a capillary that is filled with an electrolyte solution. Analytes are separated due to differences in electrophoretic mobility, which varies with charge, solvent viscosity, and size. Traditional electrophoresis in gels is limited in the amount of voltage...
FAQs
During a CaBER test, surface tension pulls the liquid filament inward, promoting capillary thinning. Opposing that contraction, viscous resistance and elastic stresses influence how quickly the diameter decreases and when the bridge breaks. The measured thinning response therefore reflects a balance between capillary forces and material behavior, rather than viscosity alone.
Shear measurements describe a fluid’s response when adjacent layers move past one another, whereas the CaBER test probes behavior during stretching. That distinction matters for fluids whose filament formation depends on elastic stresses or extensional relaxation. Using both perspectives can give engineers information that shear data alone may not capture when evaluating complex-fluid performance.
The time required for the filament to break is an observable outcome of the thinning process. Image sequences also show how the diameter evolves before breakup, allowing researchers to determine breakup time and extensional relaxation behavior, along with related rheological properties. These results connect the test’s visual record with quantitative descriptions of liquid response.
A small liquid sample is first held as a bridge between two plates. The plates then separate rapidly, creating a slender filament. As surface tension drives thinning, the instrument records images of the changing diameter until breakup. Researchers analyze this time-dependent geometry to obtain breakup and relaxation information from the same test.
Images provide the evolving filament diameter rather than only a final observation of whether breakup occurred. Tracking that diameter over time reveals the rate of capillary thinning and identifies the point of breakup. This visual record supports determination of breakup time, extensional relaxation behavior, and related rheological properties, making imaging central to interpretation.
In engineering, CaBER data can guide formulation and processing of polymer solutions, coatings, adhesives, inks, and other complex fluids. The measured stretching response helps engineers assess behavior associated with filament formation and spray performance, while also informing expectations for material performance in manufacturing and product design. Its value is greatest where extensional behavior affects processing or the finished product.