Advanced

Structure of polymer-stabilized magnetic fluids: Small-angle neutron scattering and mean-field lattice modeling

Moeser, G D; Green, W H; Laibinis, P E; Linse, Per LU and Hatton, T A (2004) In Langmuir 20(13). p.5223-5234
Abstract
Small-angle neutron scattering and mean-field lattice modeling were used to characterize a class of water-based magnetic fluids tailored specifically to extract soluble organic compounds from water. The fluids consist of a suspension of similar to7 nm magnetite (Fe3O4) nanoparticles coated with a bifunctional polymer layer comprised of an outer hydrophilic poly(ethylene oxide) (PEO) region for colloidal stability and an inner hydrophobic poly(propylene oxide) (PPO) region for solubilization of organic compounds. The inner region of the polymer shell is increasingly depleted of water as the fraction of PPO side chains increases. The incorporation of PPO side chains also leads to a small increase in interparticle attraction. The lattice... (More)
Small-angle neutron scattering and mean-field lattice modeling were used to characterize a class of water-based magnetic fluids tailored specifically to extract soluble organic compounds from water. The fluids consist of a suspension of similar to7 nm magnetite (Fe3O4) nanoparticles coated with a bifunctional polymer layer comprised of an outer hydrophilic poly(ethylene oxide) (PEO) region for colloidal stability and an inner hydrophobic poly(propylene oxide) (PPO) region for solubilization of organic compounds. The inner region of the polymer shell is increasingly depleted of water as the fraction of PPO side chains increases. The incorporation of PPO side chains also leads to a small increase in interparticle attraction. The lattice model predicted a shell structure similar to that of a PEO-PPO-PEO triblock copolymer (Pluronic) micelle, with equivalent levels of hydration but with more PEO present in the PPO-rich regions, as the side chains grafted to the surface are less able to segregate than when in free micellar systems. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
20
issue
13
pages
5223 - 5234
publisher
The American Chemical Society
external identifiers
  • wos:000222174800016
  • pmid:15986656
  • scopus:3042639895
ISSN
0743-7463
DOI
10.1021/la036240k
language
English
LU publication?
yes
id
e1437ce4-2b50-41d0-a4da-06054d0b0dda (old id 153812)
date added to LUP
2007-07-11 16:42:25
date last changed
2017-02-12 03:27:54
@article{e1437ce4-2b50-41d0-a4da-06054d0b0dda,
  abstract     = {Small-angle neutron scattering and mean-field lattice modeling were used to characterize a class of water-based magnetic fluids tailored specifically to extract soluble organic compounds from water. The fluids consist of a suspension of similar to7 nm magnetite (Fe3O4) nanoparticles coated with a bifunctional polymer layer comprised of an outer hydrophilic poly(ethylene oxide) (PEO) region for colloidal stability and an inner hydrophobic poly(propylene oxide) (PPO) region for solubilization of organic compounds. The inner region of the polymer shell is increasingly depleted of water as the fraction of PPO side chains increases. The incorporation of PPO side chains also leads to a small increase in interparticle attraction. The lattice model predicted a shell structure similar to that of a PEO-PPO-PEO triblock copolymer (Pluronic) micelle, with equivalent levels of hydration but with more PEO present in the PPO-rich regions, as the side chains grafted to the surface are less able to segregate than when in free micellar systems.},
  author       = {Moeser, G D and Green, W H and Laibinis, P E and Linse, Per and Hatton, T A},
  issn         = {0743-7463},
  language     = {eng},
  number       = {13},
  pages        = {5223--5234},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Structure of polymer-stabilized magnetic fluids: Small-angle neutron scattering and mean-field lattice modeling},
  url          = {http://dx.doi.org/10.1021/la036240k},
  volume       = {20},
  year         = {2004},
}