Magnetically actuated colloidal microswimmers.
To achieve permanent propulsion of micro-objects in confined fluids is an elusive but challenging goal that will foster future development of microfluidics and biotechnology. Recent attempts based on a wide variety of strategies are still far from being able to design simple, versatile, and fully co...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2008
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| _version_ | 1797082370313027584 |
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| author | Tierno, P Golestanian, R Pagonabarraga, I Sagués, F |
| author_facet | Tierno, P Golestanian, R Pagonabarraga, I Sagués, F |
| author_sort | Tierno, P |
| collection | OXFORD |
| description | To achieve permanent propulsion of micro-objects in confined fluids is an elusive but challenging goal that will foster future development of microfluidics and biotechnology. Recent attempts based on a wide variety of strategies are still far from being able to design simple, versatile, and fully controllable swimming engines on the microscale. Here we show that DNA-linked anisotropic colloidal rotors, composed of paramagnetic colloidal particles with different or similar size, achieve controlled propulsion when subjected to a magnetic field precessing around an axis parallel to the plane of motion. During cycling motion, stronger viscous friction at the bounding plate, as compared to fluid resistance in the bulk, creates an asymmetry in dissipation that rectifies rotation into a net translation of the suspended objects. The potentiality of the method, applicable to any externally rotated micro/nano-object, is finally demonstrated in a microfluidic platform by guiding the colloidal rotors through microscopic-size channels connected in a simple geometry. |
| first_indexed | 2024-03-07T01:27:11Z |
| format | Journal article |
| id | oxford-uuid:925e5f82-cab7-4d95-9664-b70560dafeba |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:27:11Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:925e5f82-cab7-4d95-9664-b70560dafeba2022-03-26T23:24:58ZMagnetically actuated colloidal microswimmers.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:925e5f82-cab7-4d95-9664-b70560dafebaEnglishSymplectic Elements at Oxford2008Tierno, PGolestanian, RPagonabarraga, ISagués, FTo achieve permanent propulsion of micro-objects in confined fluids is an elusive but challenging goal that will foster future development of microfluidics and biotechnology. Recent attempts based on a wide variety of strategies are still far from being able to design simple, versatile, and fully controllable swimming engines on the microscale. Here we show that DNA-linked anisotropic colloidal rotors, composed of paramagnetic colloidal particles with different or similar size, achieve controlled propulsion when subjected to a magnetic field precessing around an axis parallel to the plane of motion. During cycling motion, stronger viscous friction at the bounding plate, as compared to fluid resistance in the bulk, creates an asymmetry in dissipation that rectifies rotation into a net translation of the suspended objects. The potentiality of the method, applicable to any externally rotated micro/nano-object, is finally demonstrated in a microfluidic platform by guiding the colloidal rotors through microscopic-size channels connected in a simple geometry. |
| spellingShingle | Tierno, P Golestanian, R Pagonabarraga, I Sagués, F Magnetically actuated colloidal microswimmers. |
| title | Magnetically actuated colloidal microswimmers. |
| title_full | Magnetically actuated colloidal microswimmers. |
| title_fullStr | Magnetically actuated colloidal microswimmers. |
| title_full_unstemmed | Magnetically actuated colloidal microswimmers. |
| title_short | Magnetically actuated colloidal microswimmers. |
| title_sort | magnetically actuated colloidal microswimmers |
| work_keys_str_mv | AT tiernop magneticallyactuatedcolloidalmicroswimmers AT golestanianr magneticallyactuatedcolloidalmicroswimmers AT pagonabarragai magneticallyactuatedcolloidalmicroswimmers AT saguesf magneticallyactuatedcolloidalmicroswimmers |