Diffusive dynamics of nanoparticles in aqueous dispersions

Kai He, Melissa Spannuth, Jacinta C. Conrad, Ramanan Krishnamoorti

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The diffusive dynamics of 100 nm to 400 nm diameter polystyrene nanoparticles dispersed in water were studied using brightfield and fluorescence based differential dynamic microscopy (DDM) and compared to those obtained from dynamic light scattering. The relaxation times measured with brightfield and fluorescence DDM over a broad range of concentration of nanoparticles (10 -6 ≤ φ ≤ 10-3) and scattering vectors (0.5 μm-1 < q < 10 μm-1) are in excellent agreement with each other and extrapolate quantitatively to those obtained from DLS measurements. The diffusion coefficients extracted from the q-dependent relaxation times using all three methods are independent of the nanoparticle concentration. © 2012 The Royal Society of Chemistry.
Original languageEnglish (US)
Pages (from-to)11933
JournalSoft Matter
Volume8
Issue number47
DOIs
StatePublished - 2012
Externally publishedYes

Fingerprint Dive into the research topics of 'Diffusive dynamics of nanoparticles in aqueous dispersions'. Together they form a unique fingerprint.

Cite this