Shape separation of gold nanorods using centrifugation.
basic_science · Level V
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- Record sourced from PubMed, PMID 19255445.
- Also identified by DOI 10.1073/pnas.0800599106 and PMC identifier 2664026.
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Abstract
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.
Medical subject headings
- Centrifugation
- Gold
- Metal Nanoparticles