title: Visualization of the self-assembly of silica nanochannels reveals growth mechanism.
abstract: Self-assembled mesoporous structures with well-ordered nanoscale channels could be used in applications such as molecular separation, nano-optics, molecular electronics, nanomedicine and catalysis. However, the domain sizes that can be created in such systems are limited by our lack of a detailed understanding of the relevant growth processes. Here we report the real-time observation of domain growth in the self-assembly of silica nanochannels using fluorescence polarization imaging and atomic force microscopy. We show that transient lamellar structures precede the formation of hexagonal layers, and that the layer growth follows two distinct pathways. In addition, the domains are grown on a mesoporous film substrate, which acts as a sieve and allows control of the delivery of the reactive species. We use these insights and capabilities to grow layers of well-ordered silica nanochannels with domain sizes of up to ∼0.3 mm.
authors.affiliation: Department of Chemistry and Biochemistry and Center for Nanoscience, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, 81377 München, Germany. christoph.braeuchle@cup.uni-muenchen.de
authors.forename: Christophe
authors.initials: C
authors.lastname: Jung
authors.forename: Peter
authors.initials: P
authors.lastname: Schwaderer
authors.forename: Mark
authors.initials: M
authors.lastname: Dethlefsen
authors.forename: Ralf
authors.initials: R
authors.lastname: Köhn
authors.forename: Jens
authors.initials: J
authors.lastname: Michaelis
authors.forename: Christoph
authors.initials: C
authors.lastname: Bräuchle
mesh_terms: D004058:Diffusion; D005456:Fluorescent Dyes; D007700:Kinetics; D018625:Microscopy, Atomic Force; D008856:Microscopy, Fluorescence; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D005456:Fluorescent Dyes; D012822:Silicon Dioxide