Effect of pH on complex coacervate core micelles from Fe(III)-based coordination polymer.

The effect of pH on iron-containing complex coacervate core micelles [Fe(III)-C3Ms] is investigated in this paper. The Fe(III)-C3Ms are formed by mixing cationic poly(N-methyl-2-vinylpyridinium iodide)-b-poly(ethylene oxide) [P2MVP(41)-b-PEO(205)] and anionic iron coordination polymers [Fe(III)-L(2)EO(4)] at stoichiometric charge ratio. Light scattering and Cryo-TEM have been performed to study the variations of hydrodynamic radius and core structure with changing pH. The hydrodynamic radius of Fe(III)-C3Ms is determined mainly by the corona and does not change very much in a broad pH range. However, Cryo-TEM pictures and magnetic relaxation measurements indicate that the structure of the micellar cores changes upon changing the pH, with a more crystalline, elongated shape and lower relaxivity at high pH. We attribute this to the formation of mixed iron complexes in the core, involving both the bis-ligand and hydroxide ions. These complexes are stabilized toward precipitation by the diblock copolymer. © 2011 American Chemical Society

Citation

Junyou Wang, Arie de Keizer, Herman P van Leeuwen, Yun Yan, Frank Vergeldt, Henk van As, Paul H H Bomans, Nico A J M Sommerdijk, Martien A Cohen Stuart, Jasper van der Gucht. Effect of pH on complex coacervate core micelles from Fe(III)-based coordination polymer. Langmuir : the ACS journal of surfaces and colloids. 2011 Dec 20;27(24):14776-82

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PMID: 22035496

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