light control of phototactic microswimmer suspensions
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/1.jpg)
Light Control of Phototactic Microswimmer Suspensions
Connor Hann, Danielle Riggin, Janan ZhuDuke University
![Page 2: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/2.jpg)
How Does Light Affect Algal Motion?
(
200 Hz Camera
LightSource
Red Light (Filter)
Microscope
Flow
1 mm
1 mm
![Page 4: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/4.jpg)
Flow at Low Speeds Creates Layers of Different
Velocities
z
This type of flow is called Poiseuille Flow.
![Page 6: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/6.jpg)
Chlamydomonas Moves in Response to Light
Eyespot
![Page 7: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/7.jpg)
Visualizing Algal Flow
(
200 Hz Camera
LightSource
Red Light (Filter)
Microscope
Flow
1 mm
1 mm
![Page 8: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/8.jpg)
Light Orientation Determines Direction of Motion
![Page 9: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/9.jpg)
Light Alters Swimmer Movement
![Page 10: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/10.jpg)
Mathematical Model Matches Data
Dis
tanc
e fro
m C
ente
r
Distance along Tube
![Page 11: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/11.jpg)
Pollution Reduction
![Page 12: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/12.jpg)
• 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
Conclusions
![Page 13: Light Control of Phototactic Microswimmer Suspensions](https://reader036.vdocuments.us/reader036/viewer/2022062315/56816509550346895dd77bf0/html5/thumbnails/13.jpg)
Xabel Garcia, Salima Rafaı, and Philippe Peyla, Light Control of Phototactic Microswimmer Suspensions Phys Rev Letters 110:138106(1-5), 2013.
Acknowledgements