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Project 5 – Functional Materials by Hierachical Self Assembly
Supramolecular Patterned Surfaces Driven by Cooperative Assembly of C60 and Porphyrins on Metal Substrates
Davide Bonifazi, Hannes Spillmann, Andreas Kiebele, Michael de Wild, Paul Seiler, Fuyong Cheng, Hans-Joachim Güntherodt,Thomas Jung, and François Diederich
Angewandte Chemie Int. Ed. 2004, Volume 116, Issue 36 , Pages 4863 - 4867
Systems that spontaneously self-organize through selective
interactions into extended supramolecular entities offer a
number of powerful approaches for the development of
functional-molecule-based devices.[1] Selective noncovalent
interactions have been widely exploited both in solution and
in the solid state to prepare extended assemblies in one
(polymolecular chains and fibers),[2,3] two (arrays,layers ,and
membranes),[3,4] and three dimensions.[5] Recently this concept
has been extended to the surface engineering of multidimensional
assemblies[6] stabilized by hydrogen-bonding,[7]
dipole–di ...
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Self-assembly of reactive amphiphilic block copolymers as mimetics for biological membranes
Andreas Taubert, Alessandro Napoli and Wolfgang Meier
Current Opinion in Chemical Biology, Volume 8, Issue 6 , December 2004, Pages 598-603
Over the years, polymers have attracted a great deal of interest because they offer a unique platform for the development of materials in fields as diverse as biomedicine and packaging. Many of these purposes use polymers that had been developed for totally different applications. Recently, however, chemical tailoring and molecular and supramolecular control of the chemistry and, thus, the physical and biological response have become a key interest of many researchers. In particular, systems that operate in aqueous media have become an intensely researched field. This is mostly because many de ...
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Water-in-water mesophases for templating inorganics
Andreas Taubert , Ernst Furrer and Wolfgang Meier
Chem. Commun., 2004, (19), 2170 - 2171
A water-in-water mesophase that contains only hydrophilic domains is reported for the first time; the mesophase templates highly porous calcium phosphate.
...
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Asymmetric ABC-Triblock Copolymer Membranes Induce a Directed Insertion of Membrane Proteins
Roxana Stoenescu, Alexandra Graff, Wolfgang Meier
Macromolecular Bioscience, Volume 4, Issue 10 , Pages 930 - 935
Asymmetric molecules and materials provide an important basis for the organization and function of biological systems. It is well known that, for example, the inner and outer leaflets of biological membranes are strictly asymmetric with respect to lipid composition and distribution. This plays a crucial role for many membrane-related processes like carrier-mediated transport or insertion and orientation of integral membrane proteins. Most artificial membrane systems are, however, symmetric with respect to their midplane and membrane proteins are incorporated with random orientation. Here we de ...
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Polymer Nanocontainers for Drug Delivery
M. Sauer, A. Graff, and W. Meier
Carrier-Based Drug Delivery, pp 224-237, Oxford University Press,
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Colloidal Nanoreactors and Nanocontainers
Marc Sauer and Wolfgang Meier
Colloids and Colloid Assemblies, Wiley-VCH, ISBN 3-527-30660-9
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Reinforcement of single-walled carbon nanotube bundles by intertube bridging
A. Kis, G. Csányi, J.-P. Salvetat, Thien-Nga Lee, E. Couteau, A. J. Kulik, W. Benoit, J. Brugger and L. Forró
Nature Materials 3, 153–157 (2004)
During their production, single-walled carbon nanotubes form bundles. Owing to the weak van der Waals interaction that holds them together in the bundle, the tubes can easily slide on each other, resulting in a shear modulus comparable to that of graphite. This low shear modulus is also a major obstacle in the fabrication of macroscopic fibres composed of carbon nanotubes. Here, we have introduced stable links between neighbouring carbon nanotubes within bundles, using moderate electron-beam irradiation inside a transmission electron microscope. Concurrent measurements of the mechanical proper ...
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Behaviour of transition metals catalysts over laser-treated vanadium support surfaces in the decomposition of acetylene
Jin Won Seo , Klara Hernadi , Csilla Mikó and László Forró
Applied Catalysis A, Vol. 260, Issue 1, 87-91
Laser-treated vanadium plates having high surface area were used as catalyst support in carbon nanotube synthesis under catalytic vapour deposition (CVD) conditions. Catalytic activity of various transition metals such as Fe, Co, or Ni was compared in the decomposition of acetylene at 720 °C. Transmission and scanning electron microscopy (SEM) observations showed that there were significant differences between carbon deposits formed over the various transition metal catalysts. Carbon nanotubes with the best quality were obtained over the iron catalyst. The density is high and carbon nanotubes ...
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Synthesis and Magnetic Characterization of Cu(OH)[sub 2] Nanoribbons
P. Umek, J. W. Seo, L. Fórró, P. Cevc, Z. Jaglicic, M. Skarabot, A. Zorko, and D. Arcon
AIP Conference Proceedings, Volume 723, Issue 1, pp. 427-430
We report on the synthesis of Cu(OH)2 nanoribbons in aqueous media with a typical diameter around 15 nm. The length of the nanoribbons depends on the synthesis route and can achieve up to several µm. We also demonstrate the possibility of transforming Cu(OH)2 to CuO structures. The magnetic properties of Cu(OH)2 nanoribbons are due to antiferromagnetic interactions between Cu2+ spins bridged by OH groups and show typical low-dimensional antiferromagnetic behaviour. Finite size effects are suggested to be responsible for the increase of the magnetic susceptibility below 20 K. ...
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Effect of Irradiation on Aligned Carbon Nanotube Fibers
Cs. Mikó, M. Milas, J. W. Seo, E. Couteau, N. Barisic, R. Gaál, and L. Forró
AIP Conference Proceedings, Volume 723, Issue 1, pp. 107-110
We carried out in-situ resistivity measurements on macroscopic oriented ropes of single wall carbon nanotubes in a transmission electron microscope. We have found a minimum in the resistivity as a function of irradiation dose. This minimum is interpreted as a result of a twofold effect of the irradiation: the domination of covalent bond formation between tubes in a bundle due to broken bonds in the tube walls and the amorphization of the sample at high dose. ...
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Mass Production of Multiwalled Carbon Nanotubes by Chemical Vapor Deposition
A. Magrez, Cs. Mikó, J. W. Seo, R. Gaál, and L. Forró
AIP Conference Proceedings, Volume 723, Issue 1, pp. 61-64
We elaborated a continuous production method for multiwalled carbon nanotubes (MWCNTs) based on a rotary tube furnace. MWCNTs were synthesized by chemical vapor deposition of C2H2 over Fe1–xCox catalyst supported by carbonate. Growth parameters were optimized in a fixed bed furnace in order to increase the yield and the product quality. We have found an optimum for x=0.25, at 700°C by using CaCO3 as support. Co content does not only influence the quantity but also the quality of the product. The increase of the growth temperature as well as the use of other alkaline earth carbonates led to a d ...
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Amphiphilic Dendrimers with Heteroleptic Bis([2,2':6',2'']terpyridine)-Ruthenium(II) Cores
Derk Joester, Volker Gramlich, François Diederich
Helvetica Chimica Acta, Volume 87, Issue 11 , Pages 2896 - 2918
A new series of dendrimers was assembled through formation of homo- and heteroleptic RuII complexes with [2,2: 6,2]terpyridine ligands bearing hydrophilic and hydrophobic dendrons, with the aim to develop amphiphilic vectors for potential use in gene delivery (Scheme 1). The synthesis started with the preparation of the 4-(3,5-dihalo-4-methoxyphenyl)-[2,2: 6,2]terpyridine ligands 1a,b via the Kröhnke pyridine synthesis (Scheme 2), followed by attachment of dendrons 10a-10f (Fig. 2) by Sonogashira cross-coupling to give the dendritic ligands 11-16 (Schemes 3 and 4). Ligands were subsequently in ...
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