A study of periodic and quasi-periodicorientational motion of microrods in a shear flow using optical tweezers

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dc.contributor.authorLaas, Alexander
dc.contributor.departmentChalmers tekniska högskola / Institutionen för teknisk fysiksv
dc.contributor.departmentChalmers University of Technology / Department of Applied Physicsen
dc.date.accessioned2019-07-03T13:35:50Z
dc.date.available2019-07-03T13:35:50Z
dc.date.issued2014
dc.description.abstractThe orientational motions of single isolated inertialess microrods are studied in a reversible creeping shear ow. In previous work [12, 24, 30] it was observed that rodlike particles could experience both periodic and quasi-periodic behavior. This work studies how the orientational motion, including periodic and quasi-periodic motion, depends upon the orientational initial conditions, for a single microrod. For the purpose of changing the initial conditions, optical tweezers are installed in the experimental setup. In order to demonstrate that the microdrods and uid are inertialess the ow is reversed and the trajectories before and after the reversal are analyzed. If both the microrod and the ow are inertialess, the orientational motion of the rod is expected to retrace itself when the ow is reversed. The experimental results show that if the ow is reversed smoothly, particles can show this retraceibility. The experimental results also demonstrate that a single rod may exhibit either periodic or quasi-periodic motion, depending solely on its orientational initial condition. The observable dynamics show good agreement with Je ery's equations of motion for an inertialess ellipsoid in a creeping shear flow.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/211762
dc.language.isoeng
dc.setspec.uppsokPhysicsChemistryMaths
dc.subjectGrundläggande vetenskaper
dc.subjectEnergi
dc.subjectAnnan teknik
dc.subjectHållbar utveckling
dc.subjectInnovation och entreprenörskap (nyttiggörande)
dc.subjectBasic Sciences
dc.subjectEnergy
dc.subjectOther Engineering and Technologies
dc.subjectSustainable Development
dc.subjectInnovation & Entrepreneurship
dc.titleA study of periodic and quasi-periodicorientational motion of microrods in a shear flow using optical tweezers
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeComplex adaptive systems (MPCAS), MSc
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