Shape separation of gold nanorods using centrifugation

We demonstrate the use of centrifugation for efficient separation of colloidal gold nanorods from a mixture of nanorods and nanospheres. We elucidate the hydrodynamic behavior of nanoparticles of various shapes and illustrate that the shape-dependent drag causes particles to have shape-dependent sed...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2009-03, Vol.106 (13), p.4981-4985
Main Authors: Sharma, Vivek, Park, Kyoungweon, Srinivasarao, Mohan
Format: Article
Language:English
Subjects:
Aspect ratio
Brownian motion
Centrifugation
Centrifugation - methods
Coefficient of friction
Colloids - chemistry
Gold
Hydrodynamics
Metal Nanoparticles
Motion
Nanoparticles
Nanorods
Particle mass
Physical Sciences
Plasmons
Sediments
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Summary:We demonstrate the use of centrifugation for efficient separation of colloidal gold nanorods from a mixture of nanorods and nanospheres. We elucidate the hydrodynamic behavior of nanoparticles of various shapes and illustrate that the shape-dependent drag causes particles to have shape-dependent sedimentation behavior. During centrifugation, nanoparticles undergo Brownian motion under an external field and move with different sedimentation velocities dictated by their Svedberg coefficients. This effects a separation of particles of different shape and size. Our theoretical analysis and experiments demonstrate the viability of using centrifugation to shape-separate a mixture of colloidal particles.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0800599106