Broadband boundary effects on Brownian motion

dc.contributor.utaustinauthorMo, Jianyongen_US
dc.contributor.utaustinauthorSimha, Akarshen_US
dc.contributor.utaustinauthorRaizen, Mark G.en_US
dc.creatorMo, Jianyongen_US
dc.creatorSimha, Akarshen_US
dc.creatorRaizen, Mark G.en_US
dc.date.accessioned2017-07-18T20:11:15Z
dc.date.available2017-07-18T20:11:15Z
dc.date.issued2015-12en_US
dc.description.abstractBrownian motion of particles in confined fluids is important for many applications, yet the effects of the boundary over a wide range of time scales are still not well understood. We report high-bandwidth, comprehensive measurements of Brownian motion of an optically trapped micrometer-sized silica sphere in water near an approximately flat wall. At short distances we observe anisotropic Brownian motion with respect to the wall. We find that surface confinement not only occurs in the long time scale diffusive regime but also in the short time scale ballistic regime, and the velocity autocorrelation function of the Brownian particle decays faster than that of a particle in bulk fluid. Furthermore, at low frequencies the thermal force loses its color due to the reflected flow from the no-slip boundary. The power spectrum of the thermal force on the particle near a no-slip boundary becomes flat at low frequencies. This detailed understanding of boundary effects on Brownian motion opens a door to developing a 3D microscope using particles as remote sensors.en_US
dc.description.departmentPhysicsen_US
dc.description.sponsorshipSid W. Richardson Foundationen_US
dc.description.sponsorshipR. A. Welch Foundation F-1258en_US
dc.identifierdoi:10.15781/T2F47H898
dc.identifier.citationMo, Jianyong, Akarsh Simha, and Mark G. Raizen. "Broadband boundary effects on Brownian motion." Physical Review E 92, no. 6 (2015): 062106.en_US
dc.identifier.doi10.1103/PhysRevE.92.062106en_US
dc.identifier.issn1539-3755en_US
dc.identifier.urihttp://hdl.handle.net/2152/61167
dc.language.isoEnglishen_US
dc.relation.ispartofUT Faculty/Researcher Worksen_US
dc.relation.ispartofserialPhysical Review Een_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionopenen_US
dc.subjectinstantaneous velocityen_US
dc.subjectoptical tweezersen_US
dc.subjectparticlesen_US
dc.subjectsphereen_US
dc.subjecthydrodynamicsen_US
dc.subjectmicroscopyen_US
dc.subjectdiffusionen_US
dc.subjectcylinderen_US
dc.subjecttheoremen_US
dc.subjectliquiden_US
dc.titleBroadband boundary effects on Brownian motionen_US
dc.typeArticleen_US

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