Handle URI:
http://hdl.handle.net/10754/597977
Title:
Diffusive Dynamics of Nanoparticles in Arrays of Nanoposts
Authors:
He, Kai; Babaye Khorasani, Firoozeh; Retterer, Scott T.; Thomas, Darrell K.; Conrad, Jacinta C.; Krishnamoorti, Ramanan
Abstract:
The diffusive dynamics of dilute dispersions of nanoparticles of diameter 200-400 nm were studied in microfabricated arrays of nanoposts using differential dynamic microscopy and single particle tracking. Posts of diameter 500 nm and height 10 μm were spaced by 1.2-10 μm on a square lattice. As the spacing between posts was decreased, the dynamics of the nanoparticles slowed. Moreover, the dynamics at all length scales were best represented by a stretched exponential rather than a simple exponential. Both the relative diffusivity and the stretching exponent decreased linearly with increased confinement and, equivalently, with decreased void volume. The slowing of the overall diffusive dynamics and the broadening distribution of nanoparticle displacements with increased confinement are consistent with the onset of dynamic heterogeneity and the approach to vitrification. © 2013 American Chemical Society.
Citation:
He K, Babaye Khorasani F, Retterer ST, Thomas DK, Conrad JC, et al. (2013) Diffusive Dynamics of Nanoparticles in Arrays of Nanoposts. ACS Nano 7: 5122–5130. Available: http://dx.doi.org/10.1021/nn4007303.
Publisher:
American Chemical Society (ACS)
Journal:
ACS Nano
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
25-Jun-2013
DOI:
10.1021/nn4007303
PubMed ID:
23672180
Type:
Article
ISSN:
1936-0851; 1936-086X
Sponsors:
This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). R.K. and K.H. acknowledge the partial support of the Gulf of Mexico Research Initiative (Consortium for Ocean Leadership Grant SA 12-05/GoMRI-002). J.C.C. is supported by the American Chemical Society Petroleum Research Fund (52537-DNI7) and the National Science Foundation (DMR-1151133). A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorHe, Kaien
dc.contributor.authorBabaye Khorasani, Firoozehen
dc.contributor.authorRetterer, Scott T.en
dc.contributor.authorThomas, Darrell K.en
dc.contributor.authorConrad, Jacinta C.en
dc.contributor.authorKrishnamoorti, Ramananen
dc.date.accessioned2016-02-25T13:10:13Zen
dc.date.available2016-02-25T13:10:13Zen
dc.date.issued2013-06-25en
dc.identifier.citationHe K, Babaye Khorasani F, Retterer ST, Thomas DK, Conrad JC, et al. (2013) Diffusive Dynamics of Nanoparticles in Arrays of Nanoposts. ACS Nano 7: 5122–5130. Available: http://dx.doi.org/10.1021/nn4007303.en
dc.identifier.issn1936-0851en
dc.identifier.issn1936-086Xen
dc.identifier.pmid23672180en
dc.identifier.doi10.1021/nn4007303en
dc.identifier.urihttp://hdl.handle.net/10754/597977en
dc.description.abstractThe diffusive dynamics of dilute dispersions of nanoparticles of diameter 200-400 nm were studied in microfabricated arrays of nanoposts using differential dynamic microscopy and single particle tracking. Posts of diameter 500 nm and height 10 μm were spaced by 1.2-10 μm on a square lattice. As the spacing between posts was decreased, the dynamics of the nanoparticles slowed. Moreover, the dynamics at all length scales were best represented by a stretched exponential rather than a simple exponential. Both the relative diffusivity and the stretching exponent decreased linearly with increased confinement and, equivalently, with decreased void volume. The slowing of the overall diffusive dynamics and the broadening distribution of nanoparticle displacements with increased confinement are consistent with the onset of dynamic heterogeneity and the approach to vitrification. © 2013 American Chemical Society.en
dc.description.sponsorshipThis publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). R.K. and K.H. acknowledge the partial support of the Gulf of Mexico Research Initiative (Consortium for Ocean Leadership Grant SA 12-05/GoMRI-002). J.C.C. is supported by the American Chemical Society Petroleum Research Fund (52537-DNI7) and the National Science Foundation (DMR-1151133). A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectdiffusionen
dc.subjectnanoparticlesen
dc.subjectnon-Gaussian dynamicsen
dc.subjectporous mediaen
dc.titleDiffusive Dynamics of Nanoparticles in Arrays of Nanopostsen
dc.typeArticleen
dc.identifier.journalACS Nanoen
dc.contributor.institutionUniversity of Houston, Houston, United Statesen
dc.contributor.institutionCenter for Nanophase Materials Sciences, Oak Ridge, United Statesen
dc.contributor.institutionOak Ridge National Laboratory, Oak Ridge, United Statesen
kaust.grant.numberKUS-C1-018-02en

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