Fabrication of Surface Controlled Anisotropic Polymer Dimer Particles Containing Magnetic Cluster.
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This research is the synthesis of magnetic polystyrene dimers with controlled surface anisotropy. The fabrication process involves the preparation of magnetite magnetic clusters with strong magnetism, depending on surface modification, dispersion polymerization while using them as seeds, multilayer shell formation via layer by layer deposition, and polymer core swelling. The interaction between the swelling and multilayer shells makes pressure inside the multilayer-deposited, magnetic PS spheres, forming structurally anisotropic dimers with single PS overhangs anchored on the multilayer surfaces within minutes. The use of titania precursors and different swelling agents along with the compositional change of the multilayer shell, various surface anisotropies such as surface charge anisotropy, anisotropic hydrophilicity/hydrophobicity can be introduced into the dimer. The anisotropic makes the dimers useful as a solid surfactant that stabilizes potentially immiscible oil-water mixtures.