Guldin, S; Stefik, M; Sai, H; Wiesner, U; Steiner, U; (2015) Controlling the coassembly of highly amphiphilic block copolymers with a hydrolytic sol by solvent exchange. RSC Advances , 5 (29) 22499 - 22502. 10.1039/C5RA00836K.

PDF redissolving paper v8 RSC Advances accepted version.pdf Available under License : See the attached licence file. Download (2MB)

Abstract

The coassembly of an inorganic sol by organic structure-directing agents is a widely established technique for solution processed mesoporous metal oxides. Block copolymers with highly amphiphilic blocks are promising candidates for fast and robust material assembly into a range of periodic nano-morphologies. The high polarity difference is however an inherent challenge for the simultaneous processing of hydrophilic and hydrophobic components. Here, we show that a solvent exchange through the evaporation of the initial volatiles and redissolution in an azeotrope mixture of polar and apolar solvents with a common high boiling point allows the evolution of a micellar solution towards block copolymer-dictated structures near thermodynamic equilibrium, with controlled access to inorganic cylinders, lamellae and organic cylinders within a continuous inorganic matrix.

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