Diffusive dynamics of nanoparticles in aqueous dispersions

被引：41

作者：

He, Kai ^{[1
]}

Spannuth, Melissa ^{[1
]}

Conrad, Jacinta C. ^{[1
]}

Krishnamoorti, Ramanan ^{[1
]}

机构：

[1] Univ Houston, Dept Chem & Biomol Engn, Houston, TX 77204 USA

来源：

SOFT MATTER | 2012年 / 8卷 / 47期

关键词：

IMAGE SUBMICROSCOPIC MOTIONS; LIGHT-SCATTERING MICROSCOPY; OPTICAL TECHNIQUE; VIDEO MICROSCOPY;

D O I：

10.1039/c2sm26392k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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) <= phi <= 10(-3)) and scattering vectors (0.5 mu m(-1) < q < 10 mu m(-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.

引用

页码：11933 / 11938

页数：6

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