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Single Step Hybrid Coating Process to Enhance the Electrosteric Stabilization of Inorganic Particles

Rufier, Chantal; Reufer, Mathias; Dietsch, Herve and Schurtenberger, Peter LU (2011) In Langmuir 27(11). p.6622-6627
Abstract
We report on a single-step coating process and the resulting colloidal stability of silica-coated spindle-type hematite nanoparticles (NPs) decorated with a layer of poly-(acrylic acid) (PAA) polyelectrolyte chains that are partially incorporated into the silica shell. The stability of PAA coated NPs as a function of pH and salt concentration in water was compared to bare hematite particles and simple silica-coated hematite NPs, studying their electrophoretic mobility and the hydrodynamic radius by dynamic light scattering. Particles coated with this method were found to be more stable upon the addition of salt at pH 7, and their aggregation at the pH of the isoelectric point is reversible. The hybrid coating appears to increase the... (More)
We report on a single-step coating process and the resulting colloidal stability of silica-coated spindle-type hematite nanoparticles (NPs) decorated with a layer of poly-(acrylic acid) (PAA) polyelectrolyte chains that are partially incorporated into the silica shell. The stability of PAA coated NPs as a function of pH and salt concentration in water was compared to bare hematite particles and simple silica-coated hematite NPs, studying their electrophoretic mobility and the hydrodynamic radius by dynamic light scattering. Particles coated with this method were found to be more stable upon the addition of salt at pH 7, and their aggregation at the pH of the isoelectric point is reversible. The hybrid coating appears to increase the colloidal stability in aqueous media due to the combination of the decrease of the isoelectric point and the electrosteric stabilization. This coating method is not limited to hematite particles but can easily be adapted to any silica-coatable particle. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
27
issue
11
pages
6622 - 6627
publisher
The American Chemical Society
external identifiers
  • wos:000290978100011
  • scopus:79958005525
ISSN
0743-7463
DOI
10.1021/la200525u
language
English
LU publication?
yes
id
e048e5cf-e6f1-4d39-9dc9-650eaa58c2f7 (old id 1985876)
date added to LUP
2011-07-06 11:52:10
date last changed
2017-01-01 03:16:57
@article{e048e5cf-e6f1-4d39-9dc9-650eaa58c2f7,
  abstract     = {We report on a single-step coating process and the resulting colloidal stability of silica-coated spindle-type hematite nanoparticles (NPs) decorated with a layer of poly-(acrylic acid) (PAA) polyelectrolyte chains that are partially incorporated into the silica shell. The stability of PAA coated NPs as a function of pH and salt concentration in water was compared to bare hematite particles and simple silica-coated hematite NPs, studying their electrophoretic mobility and the hydrodynamic radius by dynamic light scattering. Particles coated with this method were found to be more stable upon the addition of salt at pH 7, and their aggregation at the pH of the isoelectric point is reversible. The hybrid coating appears to increase the colloidal stability in aqueous media due to the combination of the decrease of the isoelectric point and the electrosteric stabilization. This coating method is not limited to hematite particles but can easily be adapted to any silica-coatable particle.},
  author       = {Rufier, Chantal and Reufer, Mathias and Dietsch, Herve and Schurtenberger, Peter},
  issn         = {0743-7463},
  language     = {eng},
  number       = {11},
  pages        = {6622--6627},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Single Step Hybrid Coating Process to Enhance the Electrosteric Stabilization of Inorganic Particles},
  url          = {http://dx.doi.org/10.1021/la200525u},
  volume       = {27},
  year         = {2011},
}