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Light Control of Phototactic Microswimmer Suspensions

Connor Hann, Danielle Riggin, Janan Zhu Duke University. Light Control of Phototactic Microswimmer Suspensions. How Does Light Affect Algal Motion?. (. Red Light (Filter). Light Source . 1 mm. 1 mm. Flow. Microscope. 200 Hz Camera. Chlamydomonas Propels Itself In Fluid With Flagella.

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Light Control of Phototactic Microswimmer Suspensions

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  1. Connor Hann, Danielle Riggin, Janan Zhu Duke University Light Control of Phototactic Microswimmer Suspensions

  2. How Does Light Affect Algal Motion? ( Red Light (Filter) LightSource 1 mm 1 mm Flow Microscope 200 Hz Camera

  3. Chlamydomonas Propels Itself In Fluid With Flagella

  4. Flow at Low Speeds Creates Layers of Different Velocities z This type of flow is called Poiseuille Flow.

  5. Visualizing Poiseuille Flow

  6. Chlamydomonas Moves in Response to Light Eyespot

  7. Visualizing Algal Flow ( Red Light (Filter) LightSource 1 mm 1 mm Flow Microscope 200 Hz Camera

  8. Light Orientation Determines Direction of Motion

  9. Light Alters Swimmer Movement

  10. Mathematical Model Matches Data Distance from Center Distance along Tube

  11. Pollution Reduction

  12. Conclusions • Light was used to focus algae in a flow • A model was created that successfully explained the focusing • This technique can be applied to detecting pollution

  13. Acknowledgements Xabel Garcia, Salima Rafaı, and Philippe Peyla,Light Control of PhototacticMicroswimmer Suspensions Phys Rev Letters 110:138106(1-5), 2013.

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