Colloidal stability of iron oxide nanoparticles with multivalent polymer surfactants

Title
Colloidal stability of iron oxide nanoparticles with multivalent polymer surfactants
Authors
손대원
Keywords
Magnetic particle; Iron oxide; Polyelectrolyte; Polymer surfactant; Colloidal stability
Issue Date
2015-04
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
JOURNAL OF COLLOID AND INTERFACE SCIENCE, v. 443, Page. 8-12
Abstract
This paper introduces a new approach for preparing magnetic colloidal suspensions with electrostatic repulsion between particles and polyelectrolyte surfactants. The surface charge of the iron oxide particles was positive in acidic aqueous conditions; however the surface charge of the colloid was negative in basic aqueous conditions due to the amphoteric property of Fe2O3. The long-term colloidal stability and particle distribution of the multivalent charged polymers, Poly(4-vinylbenzenesulfonate sodium salt) (PSS), Poly(acrylic acid) (FAA), and Poly(allylamine hydrochloride) (PAH) were compared with the monovalent surfactant sodium dodecyl sulfate (SOS). Both mono- and multivalent surfactant molecules showed good colloidal stability for extended periods of time. However, the particle distribution was dependent on the hydrophobicity of the surfactants' functional groups. Polyelectrolytes with a negatively charged functional group showed good long-term stability of particles and a narrow particle distribution regardless of the acid dissociation constant (pK(a)) of the polymer. (C) 2014 Elsevier Inc. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S002197971400928Xhttp://hdl.handle.net/20.500.11754/24063
ISSN
0021-9797; 1095-7103
DOI
http://dx.doi.org/10.1016/j.jcis.2014.11.068
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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