Diffusive dynamics of nanoparticles in aqueous dispersions | Zendy

Kai He | Zendy; Melissa Spannuth | Zendy; Jacinta C. Conrad | Zendy; Ramanan Krishnamoorti | Zendy

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Diffusive dynamics of nanoparticles in aqueous dispersions

Author(s) -

Kai He,

Melissa Spannuth,

Jacinta C. Conrad,

Ramanan Krishnamoorti

Publication year - 2012

Publication title -

soft matter

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.99

H-Index - 170

eISSN - 1744-6848

pISSN - 1744-683X

DOI - 10.1039/c2sm26392k

Subject(s) - dynamic light scattering , nanoparticle , materials science , fluorescence , relaxation (psychology) , diffusion , polystyrene , aqueous solution , light scattering , scattering , microscopy , dynamics (music) , fluorescence microscope , fluorescence correlation spectroscopy , analytical chemistry (journal) , chemical physics , nanotechnology , polymer , optics , chemistry , chromatography , physics , thermodynamics , composite material , acoustics , psychology , social psychology

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

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