Diffusive Dynamics of Nanoparticles in Aqueous Dispersions
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.
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Soft Matter
2012-10-04
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| Subjects: | Polystrene nanoparticles, Differential dynamic microscopy, |
| Online Access: | https://hdl.handle.net/1813/39284 |
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dig-cornell-us-1813392842015-07-09T00:38:49Z Diffusive Dynamics of Nanoparticles in Aqueous Dispersions He, Kai Spannuth, Melissa Conrad, Jacinta Krishnamoorti, Ramanan Polystrene nanoparticles Differential dynamic microscopy 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. We thank Prof. J. Rimer for the use of the DLS instrumentation. This publication is based on the work supported in part by award no. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST) 2015-03-26T19:15:01Z 2015-03-26T19:15:01Z 2012-10-04 article He, Kai, Melissa Spannuth, Jacinta C. Conrad, and Ramanan Krishnamoorti. "Diffusive Dynamics of Nanoparticles in Aqueous Dispersions." Soft Matter: 11933. Print. https://hdl.handle.net/1813/39284 en_US application/pdf Soft Matter |
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Polystrene nanoparticles Differential dynamic microscopy Polystrene nanoparticles Differential dynamic microscopy |
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Polystrene nanoparticles Differential dynamic microscopy Polystrene nanoparticles Differential dynamic microscopy He, Kai Spannuth, Melissa Conrad, Jacinta Krishnamoorti, Ramanan Diffusive Dynamics of Nanoparticles in Aqueous Dispersions |
| description |
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. |
| format |
article |
| topic_facet |
Polystrene nanoparticles Differential dynamic microscopy |
| author |
He, Kai Spannuth, Melissa Conrad, Jacinta Krishnamoorti, Ramanan |
| author_facet |
He, Kai Spannuth, Melissa Conrad, Jacinta Krishnamoorti, Ramanan |
| author_sort |
He, Kai |
| title |
Diffusive Dynamics of Nanoparticles in Aqueous Dispersions |
| title_short |
Diffusive Dynamics of Nanoparticles in Aqueous Dispersions |
| title_full |
Diffusive Dynamics of Nanoparticles in Aqueous Dispersions |
| title_fullStr |
Diffusive Dynamics of Nanoparticles in Aqueous Dispersions |
| title_full_unstemmed |
Diffusive Dynamics of Nanoparticles in Aqueous Dispersions |
| title_sort |
diffusive dynamics of nanoparticles in aqueous dispersions |
| publisher |
Soft Matter |
| publishDate |
2012-10-04 |
| url |
https://hdl.handle.net/1813/39284 |
| work_keys_str_mv |
AT hekai diffusivedynamicsofnanoparticlesinaqueousdispersions AT spannuthmelissa diffusivedynamicsofnanoparticlesinaqueousdispersions AT conradjacinta diffusivedynamicsofnanoparticlesinaqueousdispersions AT krishnamoortiramanan diffusivedynamicsofnanoparticlesinaqueousdispersions |
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1762931013520982017 |