Janus Discs

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• 作者：Andreas Walther ; Xavier André ; Markus Drechsler ; Volker Abetz ; Axel H. E. Mü ; ller
• 刊名：Journal of the American Chemical Society
• 出版年：2007
• 出版时间：May 16, 2007
• 年：2007
• 卷：129
• 期：19
• 页码：6187 - 6198
• 全文大小：910K
• 年卷期：v.129,no.19(May 16, 2007)
• ISSN：1520-5126

文摘

We describe the synthesis and the solution properties of sheet- and disclike Janus particles,containing an inner crosslinked polybutadiene (PB) layer and two different outer sides of polystyrene (PS)and poly(tert-butyl methacrylate) (PtBMA). The structures formed upon adsorption of the flat Janus particlesonto solid substrates as well as in THF solution are investigated. The Janus discs are obtained in a template-assisted synthetic pathway followed by sonication. Selectively crosslinking the lamellar PB domains in awell-ordered lamellar microphase-separated bulk morphology of PS-block-PB-block-PtBMA (SBT) blockterpolymers leads to the conservation of the compartmentalization of the two outer blocks. Sonication ofthe crosslinked block terpolymer templates renders soluble sheet- and disclike Janus particles, the size ofwhich can be tuned from the micrometer range down to the nanometer scale. Small-angle X-ray scattering,transmission electron microscopy, dynamic light scattering, scanning force microscopy, and scanningelectron microscopy are used to characterize the template-assisted synthetic process and the solutionproperties. Cryogenic transmission electron microscopy in THF and TEM of particles, embedded into aphoto-crosslinkable silicon oil, indicate a supramolecular aggregation behavior of the Janus discs inconcentrated solutions. Pendant drop tensiometry demonstrates that Janus sheets and discs can be usedto stabilize liquid-liquid interfaces, rendering these materials interesting for future applications.