Changes in the shape and mobility of colloidal gold nanorods with electrospray and differential mobility analyzer methods

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The potential of the electrospray technique in analyzing the structure of nonspherical colloidal particles that are below 100 nm in volume-equivalent diameter was demonstrated by online size measurement using a differential mobility analyzer (DMA) with a condensation nucleus counter (CNC) system. The measured mobility of gold nanorods was confirmed by electron microscope images and the theoretical calculation of particle mobility using the dynamic shape factor and slip correction factor. To evaluate the mobility, rod particles were modeled as both a cylinder and a prolate spheroid. This study also showed that the organic surfactant coated on rod particles might be removed and that the rod particles became spherical upon the elevation of the ambient temperature during the gas-phase dispersion of colloidal nanoparticles. Moreover, the thickness of the surfactants coated on rod particles was estimated by comparing the theoretically and experimentally obtained mobilities.
Publisher
AMER CHEMICAL SOC
Issue Date
2005-11
Language
English
Article Type
Article
Keywords

SLIP CORRECTION; PARTICLES; MICROSCOPY; SPHERES; FORCE; DRAG

Citation

LANGMUIR, v.21, no.23, pp.10375 - 10382

ISSN
0743-7463
DOI
10.1021/la0513196
URI
http://hdl.handle.net/10203/10262
Appears in Collection
ME-Journal Papers(저널논문)
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