Effect of pH on complex coacervate core micelles from Fe(III)-based coordination polymer |
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Authors: | Wang Junyou de Keizer Arie van Leeuwen Herman P Yan Yun Vergeldt Frank van As Henk Bomans Paul H H Sommerdijk Nico A J M Cohen Stuart Martien A van der Gucht Jasper |
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Institution: | Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands. junyou.wang@wur.nl |
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Abstract: | 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. |
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