Probing collective dynamics of active particles using modulation force spectroscopy

Soni, G.V.; Ananthakrishna, G.; Shivashankar, G.V.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1249

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DC Field	Value	Language
dc.contributor.author	Soni, G.V.	-
dc.contributor.author	Ananthakrishna, G.	-
dc.contributor.author	Shivashankar, G.V.	-
dc.date.accessioned	2006-05-16T09:44:20Z	-
dc.date.available	2006-05-16T09:44:20Z	-
dc.date.issued	2004-09-20	-
dc.identifier.citation	Applied Physics Letters, 2004, Vol.85, p2414-2416.	en
dc.identifier.issn	0003-6951	-
dc.identifier.uri	http://hdl.handle.net/2289/1249	-
dc.description.abstract	In this letter, we report a method of measuring the dynamic viscosity of self-propelled active particles using an intensity-modulated optical tweezer. We have used a 6 µm trapped polystyrene bead suspended in a bath of motile bacterial cells as a probe. The response function amplitude of the oscillatory bead directly measures the dynamics of the spatiotemporal structure of the motile particles. We find that unlike passive systems, the viscosity is defined by distributions of response function amplitudes that represent the long-range active temporal structures. Appropriate Langevin equations are set up that capture all these essential features.	en
dc.format.extent	68783 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	The American Institute of Physics	en
dc.relation.uri	http://link.aip.org/link/?apl/85/2414	en
dc.rights	(2004) by the American Institute of Physics . This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.	en
dc.title	Probing collective dynamics of active particles using modulation force spectroscopy	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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