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Nanohybrids from Liquid Crystalline Extended Amphiphilic Dendrimers

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journal contribution
posted on 2004-04-07, 00:00 authored by Byoung-Ki Cho, Anurag Jain, Surbhi Mahajan, Hooisweng Ow, Sol M. Gruner, Ulrich Wiesner
A novel extended amphiphilic dendrimer with linear poly(ethylene oxide) (PEO) attached to a PEO-like dendritic core as hydrophilic fraction and eight docosyl chain branches as hydrophobic fraction has been prepared for the use as structure-directing agent for silica-type materials. The extended dendrimer exhibits a hexagonal columnar liquid crystalline phase in the melt. Organically modified inorganic precursors and the extended dendrimer co-assemble into nanostructured hybrids. Hybrids with 0.44 weight fraction (fw) of aluminosilicate show a lamellar morphology, while hybrids with 0.21 fw exhibit a cylindrical structure. Nanostructures were characterized by a combination of small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The results suggest that dendrimer-based amphiphiles may provide an exciting platform for the formation of multifunctional organic−inorganic nanostructured hybrid materials with unique structural characteristics.

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