Surface modification of iron oxide (Fe2O3) pigment particles with amino-functional polysiloxane for improved dispersion stability and hydrophobicity
Author:
A. Jadhav Sushilkumar,Bongiovanni Roberta,L. Marchisio Daniele,Fontana Daniela,Egger Christian
Abstract
Purpose
– The purpose of the present study is to use an amino-functional polysiloxane for the surface modification of red iron oxide (Fe2O3) pigment particles for their improved dispersion stability and hydrophobicity and to study the chemical interactions of polysiloxanes with the particle surface.
Design/methodology/approach
– Surface-treated red Fe2O3 pigment particles were prepared by treatment of the particles with different quantities of the (aminopropylmethylsiloxane)-dimethylsiloxane copolymer in concentrated suspensions in water. The samples were analysed with different instrumental and spectroscopic techniques to study the interaction of the polysiloxane with the particle surface and the effect of the surface treatment of the particles on their dispersion stability and hydrophobicity.
Findings
– Chemisorption of the amino-polysiloxane onto the surface of Fe2O3 particles resulted in stable layers which turned out to be helpful in improving greatly the dispersion stability of the particles as shown by the Static Light Scattering and Dynamic Light Scattering results. Formation of a polysiloxane coating onto the surface of the pigment particles was confirmed by studying the interactions of the polymer molecules with Fe2O3 surfaces by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy techniques.
Practical implications
– The surface-treated red Fe2O3 particles with improved dispersion stability can be important components of various formulations in applications such as the colouring of the cement or inorganic pigment-based paint formulations.
Originality/value
– The study provides mechanistic insights about the interactions of amino-polysiloxane with the red Fe2O3 particles. The process of surface modification of red Fe2O3 particles with the amino-functional polysiloxane showed increased hydrophobicity and dispersion stability which is an important requirement of the pigment-based formulations in real applications.
Subject
Materials Chemistry,Surfaces, Coatings and Films
Reference34 articles.
1. Berg-Schultz, K.
,
Vollhardt, J.H.
,
Westenfelder, H.
and
Sit, F.
(2008), “Polysiloxane Coated metal oxide particles”, US 0292711 A1. 2. Boyer, C.
,
Whittaker, M.R.
,
Bulmus, V.
,
Liu, J.
and
Davis, T.P.
(2010), “The design and utility of polymer-stabilized iron-oxide nanoparticles for nanomedicine applications”, NPG Asia Mater, Vol. 2 No. 2, pp. 23-30. 3. Chastellain, M.
,
Petri, A.
and
Hofmann, H.J.
(2004), “Particle size investigations of a multistep synthesis of PVA coated superparamagnetic nanoparticles”, Journal of Colloid Interface Science, Vol. 278 No. 2, pp. 353-360. 4. Chen, F.
,
Gao, Q.
,
Hong, G.
and
Ni, J.
(2008), “Synthesis of magnetite core–shell nanoparticles by surface-initiated ring-opening polymerization of L-lactide”, Journal of Magnetism and Magnetic Materials, Vol. 320 No. 13, pp. 1921-1927. 5. Cornell, A.R.M.
and
Schwertmann, U.
(2003), The Iron Oxides: Structure, Properties, Reactions, Occurrences and Uses, Wiley-VCH Verlag GmbH and Co. KgaA.
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