Orientation · Topic 3 of 3
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Major applications
Where microfluidics is used — diagnostics, single-cell biology, organ-on-chip, flow chemistry, and cooling.
What you’ll learn
- The major application areas and what each needs from the physics
- How the calculators on this site map onto real workflows
The concept
Diagnostics and point-of-care: lab-on-chip devices run assays — lateral-flow tests are the everyday example — using tiny samples, moving testing out of central laboratories.
Single-cell analysis: droplet microfluidics encapsulates individual cells in picolitre droplets for techniques such as single-cell RNA sequencing (scRNA-seq).
Organ-on-chip and cell culture: microchannels recreate tissue-like environments with controlled flow and chemical gradients.
Chemical synthesis and flow chemistry: continuous microreactors give fast, well-controlled reactions with excellent heat transfer.
Microfluidic cooling: dense networks of microchannels carry heat away from high-power electronics and AI chips, exploiting the large surface-area-to-volume ratio.
Why it matters
Each application leans on microscale physics: laminar gradients for cell culture, Poisson statistics for single-cell loading, and high surface-area-to-volume for cooling.
Knowing the target application tells you which physics — and which of these tools — you will actually need.
Worked example
In droplet single-cell sequencing, cells are diluted so that most droplets are empty and very few hold two cells. Whether a droplet gets 0, 1, or 2+ cells follows Poisson statistics — something you can size up directly.
Open the single-cell loading tool to see how the empty / single / doublet fractions depend on the mean cells per droplet.
Try it yourself
Put these numbers into the poisson single-cell loading calculator and see the result for your own channel.
Open the Poisson single-cell loading calculator →Common mistakes
Watch out for:
- Assuming one chip design fits every application — requirements (flow rates, materials, throughput) differ sharply between, say, cooling and single-cell work.
Keep going
Related concepts
Related tools
Further reading
- Fundamentals and Applications of Microfluidics — Nguyen & WereleyBroad coverage of devices and applications. Verify the current edition.
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