Measuring nanoparticle aggregates

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SUMMARY

This discussion focuses on measuring the velocity of magnetic nanoparticles that aggregate in various liquids. The current method involves timing the distance traveled, but participants suggest more precise techniques. Recommendations include using a Linear Variable Differential Transformer (LVDT) to measure the bulk position of aggregates in a column and adjusting the liquid flow rate to maintain particle stability. Understanding the nature of the nanoparticles, whether they are ferrofluids or permanent magnets, is also critical for accurate measurement.

PREREQUISITES
  • Understanding of magnetic nanoparticles and their properties
  • Familiarity with fluid dynamics and flow rates
  • Knowledge of measurement techniques, specifically LVDT technology
  • Basic principles of aggregation in colloidal systems
NEXT STEPS
  • Research the application of Linear Variable Differential Transformers (LVDT) in measuring particle velocity
  • Explore methods for controlling liquid flow rates to stabilize nanoparticle aggregates
  • Investigate the properties and behavior of ferrofluids compared to permanent magnets
  • Learn about advanced imaging techniques for tracking nanoparticle movement
USEFUL FOR

Researchers and engineers working with magnetic nanoparticles, fluid dynamics specialists, and anyone involved in precision measurement of colloidal systems.

kurite
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Hello,
I am currently working with magnetic nanoparticles that aggregate and can be measured on the micro scale. Part of the project involves measuring their velocity as it move through vrious liquids. My current set up is simply timing their distance traveled. Does anyone know of a more precise way of measuring this?
Thank you
 
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Welcome to PF.
Is this a ferrofluid or are the particles permanent magnets ?
https://en.wikipedia.org/wiki/Ferrofluid

Do the particles aggregate in the liquid and then begin to fall through the liquid ?
How many aggregations do you have moving through the liquid at one time ?

You might consider moving the liquid at a rate that holds the particles in a steady position. Over time the flow rate would give the velocity. It might be possible to measure bulk position of aggregates in a column with an LVDT made from three coils wound around the column.
https://en.wikipedia.org/wiki/Linear_variable_differential_transformer
 
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