Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Ralf Köhn"'
Autor:
Peter Schwaderer, Christophe Jung, Jens Michaelis, Ralf Köhn, Christoph Bräuchle, Mark Dethlefsen
Publikováno v:
Nature Nanotechnology. 6:87-92
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 suc
Publikováno v:
Applied Catalysis B: Environmental. 94:158-165
Two series of catalytically active SnO2 powders were prepared from tin(IV) tert-butoxide and tin(IV) chloride as tin precursors. A part of the synthesized samples were additionally subjected to specific treatments during the preparation—a treatment
Publikováno v:
Chemistry of Materials. 21:5754-5762
Two-dimensional (2D)-hexagonal (plane group, p6mm) mesoporous polymer resin thin films were obtained through evaporation-induced organic-organic self-assembly of a preformed oligomeric resol precursor and the triblock copolymer template pluronic P123
Publikováno v:
Chemistry - A European Journal. 15:6645-6650
Periodic mesoporous organosilica (PMO) mesophases based on bis(triethoxysilyl)ethane (BTSE) were synthesized within the confined tubular environment of anodic alumina membrane (AAM) channels. The resulting mesophases were investigated by transmission
Autor:
Michael P. Tate, Ralf Köhn, Jin Wang, Eric C. Carnes, Michael Sprung, Bernd M. Smarsly, Helen K. Baca, Darren R. Dunphy, C. Jeffrey Brinker, Todd M. Alam, Hugh W. Hillhouse, Andrew D. Collord
Publikováno v:
Langmuir. 25:9500-9509
The nanostructure of silica and hybrid thin film mesophases templated by phospholipids via an evaporation-induced self-assembly (EISA) process was investigated by grazing-incidence small-angle X-ray scattering (GISAXS). Diacyl phosphatidylcholines wi
Autor:
Dieter Himsl, Barbara Platschek, Thomas Bein, Nikolay Petkov, Ralf Köhn, Zhuo Li, Silvia Zimdars
Publikováno v:
Journal of the American Chemical Society. 130:17362-17371
An efficient method is described for the preparation of phase-pure columnar mesoporous silica nanosystems within the channels of anodic alumina membranes (AAM) via evaporation-induced self-assembly (EISA). Upon the basis of a systematic investigation
Publikováno v:
ChemPhysChem. 9:2059-2067
The structural evolution of periodic mesoporous material within the channels of anodic alumina membranes (AAMs) by evaporation-induced self-assembly (EISA) is investigated by a combination of in situ grazing-incidence small-angle X-ray scattering (GI
Autor:
S. Khalil, P.E. Johnson, George Xomeritakis, Chung-Yi Tsai, Seema Singh, Ying-Bing Jiang, C. J. Brinker, Ralf Köhn, Pratik B. Shah, Zhu Chen, Nanguo Liu
Publikováno v:
Journal of Membrane Science. 287:157-161
We present a new processing scheme for the deposition of microporous, sol–gel derived silica membranes on inexpensive, commercially available anodic alumina (Anodisk TM ) supports. In a first step, a surfactant-templated mesoporous silica sublayer
Autor:
Ralf Köhn, Nanguo Liu, C.M Braunbarth, Bernd M. Smarsly, Z Klipowicz, C. J. Brinker, George Xomeritakis
Publikováno v:
Microporous and Mesoporous Materials. 66:91-101
We present a new approach for rapid formation of mesoporous, surfactant-templated silica membranes on coarse-pore α-Al 2 O 3 ceramic supports. A surfactant-silica sol is dispersed in the gas phase in the form of small droplets and delivered to the s
Autor:
Ralf Köhn, Michael Fröba
Publikováno v:
Zeitschrift für anorganische und allgemeine Chemie. 629:1673-1682
The change in reactivity for nanostructured iron oxide within mesoporous silica materials is demonstrated. Iron oxides were incorporated into the pore system of MCM-41 and MCM-48 silica materials and characterized by powder X-ray diffraction and nitr