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Heteroepitaxial formation of aligned mesostructured silica films with large structural periodicities from mixed surfactant systems


, : Heteroepitaxial formation of aligned mesostructured silica films with large structural periodicities from mixed surfactant systems. Langmuir 29(23): 7096-7101

Liquid-crystal phases consisting of cylindrical micelles of amphiphilic block copolymers and silica precursors are epitaxially built up on aligned surface micelles formed by an alkyl-PEO surfactant, Brij56, irrespective of the large difference in the intrinsic structural periodicities resulting in the formation of fully aligned mesostructured silica films with large lattice constants. Brij56 works as an alignment controlling agent on rubbing-treated polyimide through selective adsorption from a precursor solution containing the two surfactants, a block copolymer and Brij56, through strong hydrophobic interactions to form an anisotropic surface micelle structure. Aligned mesostructured silica layers with larger periodicities, which dominantly consist of block copolymers, form on these aligned surface micelles by gradually changing the vertical periodicity keeping the lateral intermicelle distance constant. This can be regarded as a kind of heteroepitaxy because the lattice constant at the surface is different from that of the bulk of the film. On the basis of this new concept, highly aligned mesostructured silica films with structural periodicities as large as 10 nm are successfully formed, which has never been achieved when the block copolymers are used alone as the structure-directing agent. The periodicity of the aligned films can precisely be controlled by an appropriate choice of block copolymers and the mixing ratio of the two surfactants, which increases the opportunity for applications of these films with highly anisotropic mesoscale structure.

US$19.90

PMID: 23721098

DOI: 10.1021/la401342q


Other references

Weller, J.M.; Tourtas, T.; Kruse, F.E., 2016: Feasibility and Outcome of Descemet Membrane Endothelial Keratoplasty in Complex Anterior Segment and Vitreous Disease. Descemet membrane endothelial keratoplasty (DMEK) is becoming the method of choice for treating Fuchs endothelial dystrophy and pseudophakic bullous keratopathy. We investigated whether DMEK can serve as a routine procedure in endothelial decompen...

Domínguez, L.; Fernández-Garayzábal, J.F.; Blanco, M.M.; Briones, V.; Vázquez-Boland, J.A.; Blanco, J.; Suárez, G., 1990: Overlay technique for direct detection and identification of haemolytic Listeria on selective plating medium. Comparison of five media. An overlay technique is proposed for the identification and counting of heamolytic Listeria colonies directly on selective plating media. The technique was applied to different Listeria-selective plating media. In pure culture studies with collect...

Parks J.S.; Small D.M.; Hamilton J.A., 1982: The magnetic environment of carbon 13 labeled oleic acid bound to bovine serum albumin. Biophysical Journal 37(2 PART 2): 247A

Patil, D.Y.; Yadav, P.D.; Shete, A.M.; Nuchina, J.; Meti, R.; Bhattad, D.; Someshwar, S.; Mourya, D.T., 2017: Occupational exposure of cashew nut workers to Kyasanur Forest disease in Goa, India. A series of suspected cases of Kyasanur Forest disease (KFD) in subjects returning to Belgaum in Karnataka State from Goa, India, is reported herein. KFD was confirmed in 13 out of 76 cases, either by real time RT-PCR or IgM ELISA. No case fatalit...

Martin, A.M.rie; Donthineni Rao, R.; Athanasiadis, G.; Nussen Lee, S.; Staddon, A.; Warhol, M.; Lackman, R.; Weber, B., 2003: Multi-platform genomic profiling of human sarcomas. Proceedings of the American Association for Cancer Research Annual Meeting 44: 1197, July

Savel'eva G.M.; Malinovskaya S.Ya; Myasnikova I.G.; Torchinskii G.A.; Zhelnina R.K., 1973: The significance of hemodynamic investigations in obstetrics. Sovetskaya Meditsina 36(11): 56-59

Thompson, F.C.; Jary, C.L.; Chippindale, H.G., 1956: The growth of hops in grass swards. Three years' observations (1953-55) in several hop gardens have shown that hops can be grown satisfactorily in a grass sward, given a suitable seeds mixture (e.g. a timo thy/clover mixture), close control of the grass and correct nitrogenous...

Pacaud, M., 1978: Protease ii ec 3.4.21. from escherichia coli substrate specificity and kinetic properties. Protease II [EC 3.4.21.], a cytoplasmic endopeptidase from E. coli, was further characterized. In agreement with previous evidence of a trypsin[EC 3.4.21.4]-like specificity, this enzyme cleaves essentially the carboxymethylated B chain of [porcin...

Koriat, A.; Pearlman Avnion, S.; Ben Zur, H., 1998: The subjective organization of input and output events in memory. In order to study the organization of memory for self-performed actions, 80 participants were presented with 20 action phrases for ten consecutive study-test cycles. Enactment was manipulated both in the input phase and in the output phase by havi...

Goldson, A.L., 1981: Past, Present, and Prospects of intraoperative radiotherapy (IOR). Seminars in Oncology 8(1): 59-64