The self-assembly of a macroion, K56Li74H14 [MnIII40P32WVI224O888]144_ .ca.680H2O, was monitored using dynamic and static light scattering along with transmission electron microscopy techniques. The macroion possesses inhomogeneous surface charge density which makes its self-assembly behavior very unique. In solvents where the charge density inhomogeneity is significant, the counter-ion mediated attraction among the macroions is directional which results in rod-like assemblies. On the other hand, in solvents which promote non-directional hydrogen bonding between the macroions, the macroions self-assemble into spherical blackberry-type structures which have been observed in many other macroionic systems with homogeneous surface charge. The two types of morphologies are interchangeable. We propose that this work will open a new route for assembling macroions to different morphologies by tuning their surface charge distribution and/or solvent.

Self-assembly of a macroion with anisotropic surface charge density distribution

244th National Meeting (2012)

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