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Proceedings Paper

Colloidal crystallization of colloidal silica grafted with iron(0) complex-tethered polymers in organic solvents
Author(s): Kohji Yoshinaga; Emiko Mouri
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Paper Abstract

Incorporation of iron(0) complex into polymer-grafted silica and colloidal crystallization in organic solvent were studied. In this study, zero-valence iron complex, vinylferrocene (Vfc) and iron(0)tricarbonyl(4,4-dimethyl-1,-4-cyclohexadienyl) acrylate (Fe(0)Ac) or methacrylate (Fe(0)Me), were introduced into grafted polymer to prevent from increasing ionic strength in colloidal crystallization system. Poly(methyl methacrylate (MMA)-co-Vfc)-grafted silica never formed colloidal crystals in polar solvent, such as acetone or acetonitrile. However, increasing ferrocenyl group fraction in the polymer resulted in disturbing the crystallization. Poly(N-isopropylacrylamide (NIPAAm)-co-Vfc)-grafted silica, which was composed of mole fraction of Vfc, 1/3, afforded crystallization in ethanol over the particle fraction of 0.053. In the case of diene-Fe(0)(CO)3/polymer-grafted silica, poly(MMA-co-Fe(0)Ac)-, poly(NIPAAm-co-Fe(0)Ac)- and poly(N.N-dimethylacrylamide (DMAAm)-co-Fe(0)Ac)-grafted silica gave colloidal crystallization in relatively low polar solvents, DMF, acetone, acetonirile and ethanol, critical volume fraction for which were in the range from 0.054 to 0.117. In the case of copolymer-grafted silica containing Fe(0)Me, poly(MMA-co-FeMe)-grafted silica crystallized in DMF, Interestingly, especially in cases of polymer-grafted silica containing Fe(0)Ac or Fe(0)Me composed of the highest mole fraction Fe(0)Me, 1/2, afforded crystallization in DMF. The iridescence color of the colloidal crystals was changed with the combination of grafted polymer and solvent. The characteristic coloration of the solution from reddish to greenish color is possibly due to absorption of blue light region by diene-Fe(0)(CO)3 complex and Bragg deflection on colloidal crystals.

Paper Details

Date Published: 8 October 2007
PDF: 8 pages
Proc. SPIE 6767, Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III, 676708 (8 October 2007); doi: 10.1117/12.732794
Show Author Affiliations
Kohji Yoshinaga, Kyushu Institute of Technology (Japan)
Emiko Mouri, Kyushu Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 6767:
Photonic Crystals and Photonic Crystal Fibers for Sensing Applications III
Henry H. Du; Hiroshi Fudouzi, Editor(s)

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