The collective motion of thermophoretic-type active particle suspension under spatial–temporal modulation
The mesoscopic collective behavior of a thermophoretic-type active particle suspension under a spatial–temporal modulated excitation field is experimentally studied. By using a digital light processing chip, a sinusoidal-like spatial–temporal varying laser pattern (intensity wave) is projected on th...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2021-12-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0078481 |
| _version_ | 1798034791902216192 |
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| author | Chong-Wai Io Yu-Xuan Shane Yu-Sheng Tang |
| author_facet | Chong-Wai Io Yu-Xuan Shane Yu-Sheng Tang |
| author_sort | Chong-Wai Io |
| collection | DOAJ |
| description | The mesoscopic collective behavior of a thermophoretic-type active particle suspension under a spatial–temporal modulated excitation field is experimentally studied. By using a digital light processing chip, a sinusoidal-like spatial–temporal varying laser pattern (intensity wave) is projected on the particle suspension to modulate the particle propulsion strength through the thermophoretic effect and to exert spatial confinement through the optical trapping effect. For static and slow (wave speed ≪ particle propulsion speed) modulations, in contrast to the passive particles trapped around the wave crest, the self-propulsion strength splits the particle distribution into two branches adjacent to the edges of confinement similar to the bacteria system, and the profile of particle distribution moves coherently with the modulation wave. Once the wave speed increases to the order of the particle propulsion speed, the splitting of particle distribution disappears. Furthermore, it is remarkable that the forward propagating modulation-induced certain fraction of backward streaming particles are observed. This is a generic behavior of a self-propelling active particle suspension, which is not found in the bacteria system. This finding should be useful for particle manipulation at the mesoscopic scale. |
| first_indexed | 2024-04-11T20:49:14Z |
| format | Article |
| id | doaj.art-94935dbce65f4ded91f599cafc7f1ecc |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-11T20:49:14Z |
| publishDate | 2021-12-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-94935dbce65f4ded91f599cafc7f1ecc2022-12-22T04:03:54ZengAIP Publishing LLCAIP Advances2158-32262021-12-011112125028125028-710.1063/5.0078481The collective motion of thermophoretic-type active particle suspension under spatial–temporal modulationChong-Wai Io0Yu-Xuan Shane1Yu-Sheng Tang2Many-body System Laboratory, Department of Physics and Center for Nano Bio-Detection, National Chung Cheng University, Chiayi 62102, TaiwanMany-body System Laboratory, Department of Physics and Center for Nano Bio-Detection, National Chung Cheng University, Chiayi 62102, TaiwanMany-body System Laboratory, Department of Physics and Center for Nano Bio-Detection, National Chung Cheng University, Chiayi 62102, TaiwanThe mesoscopic collective behavior of a thermophoretic-type active particle suspension under a spatial–temporal modulated excitation field is experimentally studied. By using a digital light processing chip, a sinusoidal-like spatial–temporal varying laser pattern (intensity wave) is projected on the particle suspension to modulate the particle propulsion strength through the thermophoretic effect and to exert spatial confinement through the optical trapping effect. For static and slow (wave speed ≪ particle propulsion speed) modulations, in contrast to the passive particles trapped around the wave crest, the self-propulsion strength splits the particle distribution into two branches adjacent to the edges of confinement similar to the bacteria system, and the profile of particle distribution moves coherently with the modulation wave. Once the wave speed increases to the order of the particle propulsion speed, the splitting of particle distribution disappears. Furthermore, it is remarkable that the forward propagating modulation-induced certain fraction of backward streaming particles are observed. This is a generic behavior of a self-propelling active particle suspension, which is not found in the bacteria system. This finding should be useful for particle manipulation at the mesoscopic scale.http://dx.doi.org/10.1063/5.0078481 |
| spellingShingle | Chong-Wai Io Yu-Xuan Shane Yu-Sheng Tang The collective motion of thermophoretic-type active particle suspension under spatial–temporal modulation AIP Advances |
| title | The collective motion of thermophoretic-type active particle suspension under spatial–temporal modulation |
| title_full | The collective motion of thermophoretic-type active particle suspension under spatial–temporal modulation |
| title_fullStr | The collective motion of thermophoretic-type active particle suspension under spatial–temporal modulation |
| title_full_unstemmed | The collective motion of thermophoretic-type active particle suspension under spatial–temporal modulation |
| title_short | The collective motion of thermophoretic-type active particle suspension under spatial–temporal modulation |
| title_sort | collective motion of thermophoretic type active particle suspension under spatial temporal modulation |
| url | http://dx.doi.org/10.1063/5.0078481 |
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