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Formation of Superlattices of Gold Nanoparticles Using Ostwald Ripening in Emulsions : Transition from fcc to bcc Structure

Schmitt, Julien LU ; Hajiw, Stéphanie; Lecchi, Amélie; Degrouard, Jéril; Salonen, Anniina; Impéror-Clerc, Marianne and Pansu, Brigitte (2016) In Journal of Physical Chemistry B 120(25). p.5759-5766
Abstract

An efficient method to form 3D superlattices of gold nanoparticles inside oil emulsion droplets is presented. We demonstrate that this method relies on Ostwald ripening, a well-known phenomenon occurring during the aging of emulsions. The key point is that the nanoparticle concentration inside the smaller droplets is increasing very slowly with time, thus inducing the crystallization of the nanoparticles into superlattices. Using oil-in-water emulsions doped with hydrophobic gold nanoparticles, we demonstrate that this method is efficient for different types of oils (toluene, cyclohexane, dodecane, and hexadecane). 3D superlattices of the nanoparticles are obtained, with dimensions reaching a hundred nanometers. The kinetics of the... (More)

An efficient method to form 3D superlattices of gold nanoparticles inside oil emulsion droplets is presented. We demonstrate that this method relies on Ostwald ripening, a well-known phenomenon occurring during the aging of emulsions. The key point is that the nanoparticle concentration inside the smaller droplets is increasing very slowly with time, thus inducing the crystallization of the nanoparticles into superlattices. Using oil-in-water emulsions doped with hydrophobic gold nanoparticles, we demonstrate that this method is efficient for different types of oils (toluene, cyclohexane, dodecane, and hexadecane). 3D superlattices of the nanoparticles are obtained, with dimensions reaching a hundred nanometers. The kinetics of the crystallization depends on the solubility of the oil in water but also on the initial concentration of the gold nanoparticles in oil. This method also provides an innovative way to obtain the complete phase diagram of nanoparticle suspensions with concentration. Indeed, during this slow crystallization process, a transition from a disordered suspension to a fcc structure is observed, followed by a transition toward a bcc structure. This evolution with time provides key results to understand the role played by the ligands located at the surface of the nanoparticles in order to control the type of superlattices which are formed.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry B
volume
120
issue
25
pages
8 pages
publisher
The American Chemical Society
external identifiers
  • scopus:84976869149
  • wos:000379456200019
ISSN
1520-6106
DOI
10.1021/acs.jpcb.6b03287
language
English
LU publication?
yes
id
b6046ab3-63be-475f-87c0-f5d7b00ec7b8
date added to LUP
2017-01-24 08:52:08
date last changed
2017-11-19 04:36:59
@article{b6046ab3-63be-475f-87c0-f5d7b00ec7b8,
  abstract     = {<p>An efficient method to form 3D superlattices of gold nanoparticles inside oil emulsion droplets is presented. We demonstrate that this method relies on Ostwald ripening, a well-known phenomenon occurring during the aging of emulsions. The key point is that the nanoparticle concentration inside the smaller droplets is increasing very slowly with time, thus inducing the crystallization of the nanoparticles into superlattices. Using oil-in-water emulsions doped with hydrophobic gold nanoparticles, we demonstrate that this method is efficient for different types of oils (toluene, cyclohexane, dodecane, and hexadecane). 3D superlattices of the nanoparticles are obtained, with dimensions reaching a hundred nanometers. The kinetics of the crystallization depends on the solubility of the oil in water but also on the initial concentration of the gold nanoparticles in oil. This method also provides an innovative way to obtain the complete phase diagram of nanoparticle suspensions with concentration. Indeed, during this slow crystallization process, a transition from a disordered suspension to a fcc structure is observed, followed by a transition toward a bcc structure. This evolution with time provides key results to understand the role played by the ligands located at the surface of the nanoparticles in order to control the type of superlattices which are formed.</p>},
  author       = {Schmitt, Julien and Hajiw, Stéphanie and Lecchi, Amélie and Degrouard, Jéril and Salonen, Anniina and Impéror-Clerc, Marianne and Pansu, Brigitte},
  issn         = {1520-6106},
  language     = {eng},
  month        = {06},
  number       = {25},
  pages        = {5759--5766},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry B},
  title        = {Formation of Superlattices of Gold Nanoparticles Using Ostwald Ripening in Emulsions : Transition from fcc to bcc Structure},
  url          = {http://dx.doi.org/10.1021/acs.jpcb.6b03287},
  volume       = {120},
  year         = {2016},
}