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Mechanism and modeling of nanorod formation from nanodots

DSpace at IIT Bombay

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Title Mechanism and modeling of nanorod formation from nanodots
 
Creator ETHAYARAJA, M
BANDYOPADHYAYA, R
 
Subject monte-carlo-simulation
in-oil microemulsions
nanoparticle formation
oriented attachment
cdte nanoparticles
nanowire arrays
nanocrystals
zns
cds
dynamics
 
Description A population balance model based on Smoluchowski aggregation kinetics is developed to explain the formation of nanorods from a colloidal suspension of spherical nanoparticles (nanodots). Our model shows that linear pearl-chain aggregates form by the oriented attachment (OA) of nanodots during the early stages of synthesis, since it occurs with a time scale smaller than the coalescence time scale of nanodots present within an aggregate. The slower coalescence step leads to the transformation of the linear pearl-chain aggregate into a smooth nanorod over a longer time scale of many hours, as observed in experiments. The attachment kinetics is modeled by a modified Brownian collision frequency, with the latter decreasing with nanorod length, leading to the experimentally observed slower growth in nanorod length at longer times. The collision frequency also includes the effects of attractive dipole-dipole and van der Waals interactions between nanodots, which are primarily responsible for OA. Our model predictions are general, and they compare favorably with available experimental data in the literature on the distribution of the aspect ratio (length to diameter) of ZnO and ZnS nanorods over different time scales.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-14T10:52:49Z
2011-12-26T12:48:21Z
2011-12-27T05:43:11Z
2011-07-14T10:52:49Z
2011-12-26T12:48:21Z
2011-12-27T05:43:11Z
2007
 
Type Article
 
Identifier LANGMUIR, 23(11), 6418-6423
0743-7463
http://dx.doi.org/10.1021/la070126a
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3936
http://hdl.handle.net/10054/3936
 
Language en