Electrospun fiber mats: Transport properties
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Materials Literature
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Transition metals in supramolecular chemistry
Ligand and metal control of self-assembly in supramolecular chemistry, Rolf W. Saalfrank and Bernhard Demleitner bistability in iron (II) spin-crossover systems - a supramolecular function, Jose Antonio Real fluorescent sensors for and with transition metals, Luigi Fabbrizzi Maurizo Licchelli, Piersandro Pallavicini,…
Low temperature synthesis of nanocrystalline Y3Al5O12 (YAG) and Ce-doped Y3Al5O12 via different sol–gel methods
Nanocrystalline yttrium aluminium garnet (YAG, Y3Al5O12) and Ce-doped YAG ceramics were synthesized by two ‘soft chemistry' sol–gel processes using (i) mixtures of inorganic salts or oxides and (ii) mixtures of alkoxides of the respective elements. In the first approach the metal ions, generated by dissolving metal ox…
5,10,15-Triphenylcorrole: a product from a modified Rothemund reaction
One-pot synthesis of 5,10,15-triphenylcorrole has been achieved by reaction of benzaldehyde with an excess of pyrrole; the triphenylphosphinocobalt complex of 5,10,15-triphenylcorrole has been structurally characterized using X-ray crystallography.
Molecular design of hybrid organic-inorganic nanocomposites synthesized via sol-gel chemistry
The design, synthesis and some optical properties of hybrid organic-inorganic nanocomposites materials are presented. The properties that can be expected for such materials depend on the chemical nature of their components, but they also depend on the synergy of these components. Thus, the interface in these nanocompo…
Exponential multiplicity of inherent structures
The mechanically stable spatial arrangements of interacting molecules (potential energy minima, ``inherent structures'') provide a discrete fiducial basis for understanding condensed phase properties. Simple plausibility arguments have been advanced previously suggesting that at fixed positive density the number of di…
Organometallic chemistry on silicon surfaces: formation of functional monolayers bound through Si–C bonds
Silicon chips form the backbone of modern computing and yet until recently, the surface chemistry of this technologically essential material has remained relatively unexplored. As the size of devices on silicon wafers shrink (towards gigascale integration), the surface characteristics play increasingly crucial roles i…
Thermal constants of substances
Elements: O, H, D, T, F, Cl, Br, I(J), At, 3He, He, Ne, Ar, Kr, Xe, Rn. Elements: S, Se, Te, Po. Elements: N, P, As, Sb, Bi. Elements: C, Si, Ge, Sn, Pb. Elements: B, Al, Ga, In, Tl. Elements: Zn, Cd, Hg, Cu, Ag, Au, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt. Elements: Mn, Tc, Re, Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf. Elements:…
Directed evolution converts subtilisin E into a functional equivalent of thermitase
We used directed evolution to convert Bacillus subtilis subtilisin E into an enzyme functionally equivalent to its thermophilic homolog thermitase from Thermoactinomyces vulgaris. Five generations of random mutagenesis, recombination and screening created subtilisin E 5-3H5, whose half-life at 83 degrees C (3.5 min) a…
Emulsions: basic principles
Emulsions are metastable colloids made out of two immiscible fluids, one being dispersed in the other, in the presence of surface active agents. Emulsion droplets exhibit all the classical behaviours of metastable colloids: Brownian motion, reversible phase transitions as a result of droplet interactions that may be s…
Grafted poly(ethylene oxide) brushes as nonfouling surface coatings
The identification of design criteria for the prevention of surface fouling by protein adsorption has been an elusive research goal. The current ideas in this domain assume two different directions. One focuses on correlating protein adsorption with macroscopic surface properties such as the water wettability. The sec…
Imaging Electron Wave Functions of Quantized Energy Levels in Carbon Nanotubes
Carbon nanotubes provide a unique system for studying one-dimensional quantization phenomena. Scanning tunneling microscopy was used to observe the electronic wave functions that correspond to quantized energy levels in short metallic carbon nanotubes. Discrete electron waves were apparent from periodic oscillations i…
Phase transitions in perovskite at elevated temperatures - a powder neutron diffraction study
The structure of CaTiO 3 has been studied at high temperatures by powder neutron diffraction methods. From inspection of the diffraction data two phase transitions are evident, with an intermediate tetragonal ( I / mcm ) structure forming near 1500 K and a primitive cubic structure above 1580 K. Detailed Rietveld anal…
Structural details and magnetic order ofLa1−xSrxCoO3(x<~0.3)
The crystallographic structure and the magnetic order of the distorted perovskite ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$ $(0.10<~x<~0.30)$ has been studied by neutron diffraction, high-resolution electron microscopy, and magnetic-susceptibility measurements. The results give direct…
Tetrathiafulvalenes as π-Electron Donors for Intramolecular Charge-Transfer Materials
Although tetrathiafulvalene (TTF) and its derivatives have been extensively studied for more than 25 years as π-electron donors in intermolecular charge-transfer materials, the intriguing potential of TTF as a donor in an intramolecular sense has only recently been developed. Many versatile, functionalized TTF buildin…
Direct preparation of anatase TiO2 nanotubes in porous alumina membranes
Monodisperse hollow nanocylinders consisting of crystalline titania particles have been directly prepared in a porous alumina membrane by a deposition technique using an aqueous solution system of titanium tetrafluoride.
A variety of combinatorially linkable units as disposition:† from a giant icosahedral Keplerate to multi-functional metal–oxide based network structures
In polyoxometalate chemistry a large variety of compounds, clusters and solid-state structures can be formed by linking together metal–oxygen building blocks. Interestingly, reactions based on libraries of virtual building blocks can be planned under appropriate conditions, resulting for instance in the high-yield syn…
The prediction of inorganic crystal structures using a genetic algorithm and energy minimisation
A genetic algorithm has been used to generate plausible crystal structures from the knowledge of only the unit cell dimensions and constituent elements. We successfully generate 38 known binary oxides and various known ternary oxides with the Perovskite, Pyrochlore and Spinel structures, from starting configurations w…
Efficient dopants for ZrNiSn-based thermoelectric materials
Four efficient n-type dopants have been found for ZrNiSn-based thermoelectric materials. These are Nb or Ta at the zirconium sites, and Sb or Bi at the tin sites. No suitable dopant was found for the nickel sites. In a alloy, a power factor of and a thermal conductivity of were measured at 300 K, resulting in a dimens…
Mono- and polymetallic lanthanide-containing functional assemblies: a field between tradition and novelty
The variable and versatile co-ordination behaviour of lanthanide metal ions, LnIII, limits their selective introduction into organised molecular or supramolecular architectures. The design of lanthanide-based devices is thus a special challenge since their specific electronic, magnetic or spectroscopic properties resu…